#! /bin/sh # SPDX-License-Identifier: GPL-3.0-only # vim: set ts=8 sw=8 sts=4 noet: # # Spectre & Meltdown checker # # Check for the latest version at: # https://github.com/speed47/spectre-meltdown-checker # git clone https://github.com/speed47/spectre-meltdown-checker.git # or wget https://meltdown.ovh -O spectre-meltdown-checker.sh # or curl -L https://meltdown.ovh -o spectre-meltdown-checker.sh # # Stephane Lesimple # VERSION='0.44+' trap 'exit_cleanup' EXIT trap '_warn "interrupted, cleaning up..."; exit_cleanup; exit 1' INT exit_cleanup() { # cleanup the temp decompressed config & kernel image [ -n "$dumped_config" ] && [ -f "$dumped_config" ] && rm -f "$dumped_config" [ -n "$kerneltmp" ] && [ -f "$kerneltmp" ] && rm -f "$kerneltmp" [ -n "$kerneltmp2" ] && [ -f "$kerneltmp2" ] && rm -f "$kerneltmp2" [ -n "$mcedb_tmp" ] && [ -f "$mcedb_tmp" ] && rm -f "$mcedb_tmp" [ -n "$intel_tmp" ] && [ -d "$intel_tmp" ] && rm -rf "$intel_tmp" [ "$mounted_debugfs" = 1 ] && umount /sys/kernel/debug 2>/dev/null [ "$mounted_procfs" = 1 ] && umount "$procfs" 2>/dev/null [ "$insmod_cpuid" = 1 ] && rmmod cpuid 2>/dev/null [ "$insmod_msr" = 1 ] && rmmod msr 2>/dev/null [ "$kldload_cpuctl" = 1 ] && kldunload cpuctl 2>/dev/null [ "$kldload_vmm" = 1 ] && kldunload vmm 2>/dev/null } # if we were git clone'd, adjust VERSION if [ -d "$(dirname "$0")/.git" ] && command -v git >/dev/null 2>&1; then describe=$(git -C "$(dirname "$0")" describe --tags --dirty 2>/dev/null) [ -n "$describe" ] && VERSION=$(echo "$describe" | sed -e s/^v//) fi show_usage() { # shellcheck disable=SC2086 cat <] [--config ] [--map ]> --live Offline mode: $(basename $0) [options] <[--kernel ] [--config ] [--map ]> Modes: Two modes are available. First mode is the "live" mode (default), it does its best to find information about the currently running kernel. To run under this mode, just start the script without any option (you can also use --live explicitly) Second mode is the "offline" mode, where you can inspect a non-running kernel. This mode is automatically enabled when you specify the location of the kernel file, config and System.map files: --kernel kernel_file specify a (possibly compressed) Linux or BSD kernel file --config kernel_config specify a kernel config file (Linux only) --map kernel_map_file specify a kernel System.map file (Linux only) If you want to use live mode while specifying the location of the kernel, config or map file yourself, you can add --live to the above options, to tell the script to run in live mode instead of the offline mode, which is enabled by default when at least one file is specified on the command line. Options: --no-color don't use color codes --verbose, -v increase verbosity level, possibly several times --explain produce an additional human-readable explanation of actions to take to mitigate a vulnerability --paranoid require IBPB to deem Variant 2 as mitigated also require SMT disabled + unconditional L1D flush to deem Foreshadow-NG VMM as mitigated also require SMT disabled to deem MDS vulnerabilities mitigated --no-sysfs don't use the /sys interface even if present [Linux] --sysfs-only only use the /sys interface, don't run our own checks [Linux] --coreos special mode for CoreOS (use an ephemeral toolbox to inspect kernel) [Linux] --arch-prefix PREFIX specify a prefix for cross-inspecting a kernel of a different arch, for example "aarch64-linux-gnu-", so that invoked tools will be prefixed with this (i.e. aarch64-linux-gnu-objdump) --batch text produce machine readable output, this is the default if --batch is specified alone --batch short produce only one line with the vulnerabilities separated by spaces --batch json produce JSON output formatted for Puppet, Ansible, Chef... --batch nrpe produce machine readable output formatted for NRPE --batch prometheus produce output for consumption by prometheus-node-exporter --variant VARIANT specify which variant you'd like to check, by default all variants are checked VARIANT can be one of 1, 2, 3, 3a, 4, l1tf, msbds, mfbds, mlpds, mdsum, taa, mcepsc, srbds can be specified multiple times (e.g. --variant 2 --variant 3) --cve [cve1,cve2,...] specify which CVE you'd like to check, by default all supported CVEs are checked --hw-only only check for CPU information, don't check for any variant --no-hw skip CPU information and checks, if you're inspecting a kernel not to be run on this host --vmm [auto,yes,no] override the detection of the presence of a hypervisor, default: auto --update-fwdb update our local copy of the CPU microcodes versions database (using the awesome MCExtractor project and the Intel firmwares GitHub repository) --update-builtin-fwdb same as --update-fwdb but update builtin DB inside the script itself --dump-mock-data used to mimick a CPU on an other system, mainly used to help debugging this script Return codes: 0 (not vulnerable), 2 (vulnerable), 3 (unknown), 255 (error) IMPORTANT: A false sense of security is worse than no security at all. Please use the --disclaimer option to understand exactly what this script does. EOF } show_disclaimer() { cat </dev/null 2>&1; then echo_cmd=$(command -v printf) echo_cmd_type='printf' elif which echo >/dev/null 2>&1; then echo_cmd=$(which echo) else # maybe the `which` command is broken? [ -x /bin/echo ] && echo_cmd=/bin/echo # for Android [ -x /system/bin/echo ] && echo_cmd=/system/bin/echo fi # still empty? fallback to builtin [ -z "$echo_cmd" ] && echo_cmd='echo' __echo() { opt="$1" shift _msg="$*" if [ "$opt_no_color" = 1 ] ; then # strip ANSI color codes # some sed versions (i.e. toybox) can't seem to handle # \033 aka \x1B correctly, so do it for them. if [ "$echo_cmd_type" = printf ]; then _interpret_chars='' else _interpret_chars='-e' fi _ctrlchar=$($echo_cmd $_interpret_chars "\033") _msg=$($echo_cmd $_interpret_chars "$_msg" | sed -r "s/$_ctrlchar\[([0-9][0-9]?(;[0-9][0-9]?)?)?m//g") fi if [ "$echo_cmd_type" = printf ]; then if [ "$opt" = "-n" ]; then $echo_cmd "$_msg" else $echo_cmd "$_msg\n" fi else # shellcheck disable=SC2086 $echo_cmd $opt -e "$_msg" fi } _echo() { if [ "$opt_verbose" -ge "$1" ]; then shift __echo '' "$*" fi } _echo_nol() { if [ "$opt_verbose" -ge "$1" ]; then shift __echo -n "$*" fi } _warn() { _echo 0 "\033[31m$*\033[0m" >&2 } _info() { _echo 1 "$*" } _info_nol() { _echo_nol 1 "$*" } _verbose() { _echo 2 "$*" } _verbose_nol() { _echo_nol 2 "$*" } _debug() { _echo 3 "\033[34m(debug) $*\033[0m" } explain() { if [ "$opt_explain" = 1 ] ; then _info '' _info "> \033[41m\033[30mHow to fix:\033[0m $*" fi } cve2name() { case "$1" in CVE-2017-5753) echo "Spectre Variant 1, bounds check bypass";; CVE-2017-5715) echo "Spectre Variant 2, branch target injection";; CVE-2017-5754) echo "Variant 3, Meltdown, rogue data cache load";; CVE-2018-3640) echo "Variant 3a, rogue system register read";; CVE-2018-3639) echo "Variant 4, speculative store bypass";; CVE-2018-3615) echo "Foreshadow (SGX), L1 terminal fault";; CVE-2018-3620) echo "Foreshadow-NG (OS), L1 terminal fault";; CVE-2018-3646) echo "Foreshadow-NG (VMM), L1 terminal fault";; CVE-2018-12126) echo "Fallout, microarchitectural store buffer data sampling (MSBDS)";; CVE-2018-12130) echo "ZombieLoad, microarchitectural fill buffer data sampling (MFBDS)";; CVE-2018-12127) echo "RIDL, microarchitectural load port data sampling (MLPDS)";; CVE-2019-11091) echo "RIDL, microarchitectural data sampling uncacheable memory (MDSUM)";; CVE-2019-11135) echo "ZombieLoad V2, TSX Asynchronous Abort (TAA)";; CVE-2018-12207) echo "No eXcuses, iTLB Multihit, machine check exception on page size changes (MCEPSC)";; CVE-2020-0543) echo "Special Register Buffer Data Sampling (SRBDS)";; *) echo "$0: error: invalid CVE '$1' passed to cve2name()" >&2; exit 255;; esac } is_cpu_vulnerable_cached=0 _is_cpu_vulnerable_cached() { # shellcheck disable=SC2086 case "$1" in CVE-2017-5753) return $variant1;; CVE-2017-5715) return $variant2;; CVE-2017-5754) return $variant3;; CVE-2018-3640) return $variant3a;; CVE-2018-3639) return $variant4;; CVE-2018-3615) return $variantl1tf_sgx;; CVE-2018-3620) return $variantl1tf;; CVE-2018-3646) return $variantl1tf;; CVE-2018-12126) return $variant_msbds;; CVE-2018-12130) return $variant_mfbds;; CVE-2018-12127) return $variant_mlpds;; CVE-2019-11091) return $variant_mdsum;; CVE-2019-11135) return $variant_taa;; CVE-2018-12207) return $variant_itlbmh;; CVE-2020-0543) return $variant_srbds;; *) echo "$0: error: invalid variant '$1' passed to is_cpu_vulnerable()" >&2; exit 255;; esac } is_cpu_vulnerable() { # param: one of the $supported_cve_list items # returns 0 if vulnerable, 1 if not vulnerable # (note that in shell, a return of 0 is success) # by default, everything is vulnerable, we work in a "whitelist" logic here. # usage: is_cpu_vulnerable CVE-xxxx-yyyy && do something if vulnerable if [ "$is_cpu_vulnerable_cached" = 1 ]; then _is_cpu_vulnerable_cached "$1" return $? fi variant1='' variant2='' variant3='' variant3a='' variant4='' variantl1tf='' variant_msbds='' variant_mfbds='' variant_mlpds='' variant_mdsum='' variant_taa='' variant_itlbmh='' variant_srbds='' if is_cpu_mds_free; then [ -z "$variant_msbds" ] && variant_msbds=immune [ -z "$variant_mfbds" ] && variant_mfbds=immune [ -z "$variant_mlpds" ] && variant_mlpds=immune [ -z "$variant_mdsum" ] && variant_mdsum=immune _debug "is_cpu_vulnerable: cpu not affected by Microarchitectural Data Sampling" fi if is_cpu_taa_free; then [ -z "$variant_taa" ] && variant_taa=immune _debug "is_cpu_vulnerable: cpu not affected by TSX Asynhronous Abort" fi if is_cpu_srbds_free; then [ -z "$variant_srbds" ] && variant_srbds=immune _debug "is_cpu_vulnerable: cpu not affected by Special Register Buffer Data Sampling" fi if is_cpu_specex_free; then variant1=immune variant2=immune variant3=immune variant3a=immune variant4=immune variantl1tf=immune variant_msbds=immune variant_mfbds=immune variant_mlpds=immune variant_mdsum=immune variant_taa=immune variant_srbds=immune elif is_intel; then # Intel # https://github.com/crozone/SpectrePoC/issues/1 ^F E5200 => spectre 2 not vulnerable # https://github.com/paboldin/meltdown-exploit/issues/19 ^F E5200 => meltdown vulnerable # model name : Pentium(R) Dual-Core CPU E5200 @ 2.50GHz if echo "$cpu_friendly_name" | grep -qE 'Pentium\(R\) Dual-Core[[:space:]]+CPU[[:space:]]+E[0-9]{4}K?'; then variant1=vuln [ -z "$variant2" ] && variant2=immune variant3=vuln fi if [ "$capabilities_rdcl_no" = 1 ]; then # capability bit for future Intel processor that will explicitly state # that they're not vulnerable to Meltdown # this var is set in check_cpu() [ -z "$variant3" ] && variant3=immune [ -z "$variantl1tf" ] && variantl1tf=immune _debug "is_cpu_vulnerable: RDCL_NO is set so not vuln to meltdown nor l1tf" fi if [ "$capabilities_ssb_no" = 1 ]; then # capability bit for future Intel processor that will explicitly state # that they're not vulnerable to Variant 4 # this var is set in check_cpu() [ -z "$variant4" ] && variant4=immune _debug "is_cpu_vulnerable: SSB_NO is set so not vuln to variant4" fi if is_cpu_ssb_free; then [ -z "$variant4" ] && variant4=immune _debug "is_cpu_vulnerable: cpu not affected by speculative store bypass so not vuln to variant4" fi # variant 3a if [ "$cpu_family" = 6 ]; then if [ "$cpu_model" = "$INTEL_FAM6_XEON_PHI_KNL" ] || [ "$cpu_model" = "$INTEL_FAM6_XEON_PHI_KNM" ]; then _debug "is_cpu_vulnerable: xeon phi immune to variant 3a" [ -z "$variant3a" ] && variant3a=immune elif [ "$cpu_model" = "$INTEL_FAM6_ATOM_SILVERMONT" ] || \ [ "$cpu_model" = "$INTEL_FAM6_ATOM_SILVERMONT_MID" ] || \ [ "$cpu_model" = "$INTEL_FAM6_ATOM_SILVERMONT_D" ]; then # https://www.intel.com/content/www/us/en/security-center/advisory/intel-sa-00115.html # https://github.com/speed47/spectre-meltdown-checker/issues/310 # => silvermont CPUs (aka cherry lake for tablets and brawsell for mobile/desktop) don't seem to be vulnerable # => goldmont ARE vulnerable _debug "is_cpu_vulnerable: silvermont immune to variant 3a" [ -z "$variant3a" ] && variant3a=immune fi fi # L1TF (RDCL_NO already checked above) if [ "$cpu_family" = 6 ]; then if [ "$cpu_model" = "$INTEL_FAM6_ATOM_SALTWELL" ] || \ [ "$cpu_model" = "$INTEL_FAM6_ATOM_SALTWELL_TABLET" ] || \ [ "$cpu_model" = "$INTEL_FAM6_ATOM_SALTWELL_MID" ] || \ [ "$cpu_model" = "$INTEL_FAM6_ATOM_BONNELL" ] || \ [ "$cpu_model" = "$INTEL_FAM6_ATOM_BONNELL_MID" ] || \ [ "$cpu_model" = "$INTEL_FAM6_ATOM_SILVERMONT" ] || \ [ "$cpu_model" = "$INTEL_FAM6_ATOM_SILVERMONT_MID" ] || \ [ "$cpu_model" = "$INTEL_FAM6_ATOM_SILVERMONT_D" ] || \ [ "$cpu_model" = "$INTEL_FAM6_ATOM_AIRMONT" ] || \ [ "$cpu_model" = "$INTEL_FAM6_ATOM_AIRMONT_MID" ] || \ [ "$cpu_model" = "$INTEL_FAM6_ATOM_AIRMONT_NP" ] || \ [ "$cpu_model" = "$INTEL_FAM6_ATOM_GOLDMONT" ] || \ [ "$cpu_model" = "$INTEL_FAM6_ATOM_GOLDMONT_D" ] || \ [ "$cpu_model" = "$INTEL_FAM6_ATOM_GOLDMONT_PLUS" ] || \ [ "$cpu_model" = "$INTEL_FAM6_ATOM_TREMONT_D" ] || \ [ "$cpu_model" = "$INTEL_FAM6_XEON_PHI_KNL" ] || \ [ "$cpu_model" = "$INTEL_FAM6_XEON_PHI_KNM" ]; then _debug "is_cpu_vulnerable: intel family 6 but model known to be immune to l1tf" [ -z "$variantl1tf" ] && variantl1tf=immune else _debug "is_cpu_vulnerable: intel family 6 is vuln to l1tf" variantl1tf=vuln fi elif [ "$cpu_family" -lt 6 ]; then _debug "is_cpu_vulnerable: intel family < 6 is immune to l1tf" [ -z "$variantl1tf" ] && variantl1tf=immune fi elif is_amd || is_hygon; then # AMD revised their statement about variant2 => vulnerable # https://www.amd.com/en/corporate/speculative-execution variant1=vuln variant2=vuln [ -z "$variant3" ] && variant3=immune # https://www.amd.com/en/corporate/security-updates # "We have not identified any AMD x86 products susceptible to the Variant 3a vulnerability in our analysis to-date." [ -z "$variant3a" ] && variant3a=immune if is_cpu_ssb_free; then [ -z "$variant4" ] && variant4=immune _debug "is_cpu_vulnerable: cpu not affected by speculative store bypass so not vuln to variant4" fi variantl1tf=immune elif [ "$cpu_vendor" = CAVIUM ]; then variant3=immune variant3a=immune variantl1tf=immune elif [ "$cpu_vendor" = PHYTIUM ]; then variant3=immune variant3a=immune variantl1tf=immune elif [ "$cpu_vendor" = ARM ]; then # ARM # reference: https://developer.arm.com/support/security-update # some devices (phones or other) have several ARMs and as such different part numbers, # an example is "bigLITTLE". we shouldn't rely on the first CPU only, so we check the whole list i=0 for cpupart in $cpu_part_list do i=$(( i + 1 )) # do NOT quote $cpu_arch_list below # shellcheck disable=SC2086 cpuarch=$(echo $cpu_arch_list | awk '{ print $'$i' }') _debug "checking cpu$i: <$cpupart> <$cpuarch>" # some kernels report AArch64 instead of 8 [ "$cpuarch" = "AArch64" ] && cpuarch=8 if [ -n "$cpupart" ] && [ -n "$cpuarch" ]; then # Cortex-R7 and Cortex-R8 are real-time and only used in medical devices or such # I can't find their CPU part number, but it's probably not that useful anyway # model R7 R8 A8 A9 A12 A15 A17 A57 A72 A73 A75 A76 Neoverse-N1 A77 # part ? ? c08 c09 c0d c0f c0e d07 d08 d09 d0a d0b d0c d0d # arch 7? 7? 7 7 7 7 7 8 8 8 8 8 8 8 # # Whitelist identified non-vulnerable processors, use vulnerability information from # https://developer.arm.com/support/arm-security-updates/speculative-processor-vulnerability # Partnumbers can be found here: # https://github.com/gcc-mirror/gcc/blob/master/gcc/config/arm/arm-cpus.in # # Maintain cumulative check of vulnerabilities - # if at least one of the cpu is vulnerable, then the system is vulnerable if [ "$cpuarch" = 7 ] && echo "$cpupart" | grep -q -w -e 0xc08 -e 0xc09 -e 0xc0d -e 0xc0e; then variant1=vuln variant2=vuln [ -z "$variant3" ] && variant3=immune [ -z "$variant3a" ] && variant3a=immune [ -z "$variant4" ] && variant4=immune _debug "checking cpu$i: armv7 A8/A9/A12/A17 non vulnerable to variants 3, 3a & 4" elif [ "$cpuarch" = 7 ] && echo "$cpupart" | grep -q -w -e 0xc0f; then variant1=vuln variant2=vuln [ -z "$variant3" ] && variant3=immune variant3a=vuln [ -z "$variant4" ] && variant4=immune _debug "checking cpu$i: armv7 A15 non vulnerable to variants 3 & 4" elif [ "$cpuarch" = 8 ] && echo "$cpupart" | grep -q -w -e 0xd07 -e 0xd08; then variant1=vuln variant2=vuln [ -z "$variant3" ] && variant3=immune variant3a=vuln variant4=vuln _debug "checking cpu$i: armv8 A57/A72 non vulnerable to variants 3" elif [ "$cpuarch" = 8 ] && echo "$cpupart" | grep -q -w -e 0xd09; then variant1=vuln variant2=vuln [ -z "$variant3" ] && variant3=immune [ -z "$variant3a" ] && variant3a=immune variant4=vuln _debug "checking cpu$i: armv8 A73 non vulnerable to variants 3 & 3a" elif [ "$cpuarch" = 8 ] && echo "$cpupart" | grep -q -w -e 0xd0a; then variant1=vuln variant2=vuln variant3=vuln [ -z "$variant3a" ] && variant3a=immune variant4=vuln _debug "checking cpu$i: armv8 A75 non vulnerable to variant 3a" elif [ "$cpuarch" = 8 ] && echo "$cpupart" | grep -q -w -e 0xd0b -e 0xd0c -e 0xd0d; then variant1=vuln [ -z "$variant2" ] && variant2=immune [ -z "$variant3" ] && variant3=immune [ -z "$variant3a" ] && variant3a=immune variant4=vuln _debug "checking cpu$i: armv8 A76/A77/NeoverseN1 non vulnerable to variant 2, 3 & 3a" elif [ "$cpuarch" -le 7 ] || { [ "$cpuarch" = 8 ] && [ $(( cpupart )) -lt $(( 0xd07 )) ]; } ; then [ -z "$variant1" ] && variant1=immune [ -z "$variant2" ] && variant2=immune [ -z "$variant3" ] && variant3=immune [ -z "$variant3a" ] && variant3a=immune [ -z "$variant4" ] && variant4=immune _debug "checking cpu$i: arm arch$cpuarch, all immune (v7 or v8 and model < 0xd07)" else variant1=vuln variant2=vuln variant3=vuln variant3a=vuln variant4=vuln _debug "checking cpu$i: arm unknown arch$cpuarch part$cpupart, considering vuln" fi fi _debug "is_cpu_vulnerable: for cpu$i and so far, we have <$variant1> <$variant2> <$variant3> <$variant3a> <$variant4>" done variantl1tf=immune fi # we handle iTLB Multihit here (not linked to is_specex_free) if is_intel; then # commit f9aa6b73a407b714c9aac44734eb4045c893c6f7 if [ "$cpu_family" = 6 ]; then if [ "$cpu_model" = "$INTEL_FAM6_ATOM_SALTWELL" ] || \ [ "$cpu_model" = "$INTEL_FAM6_ATOM_SALTWELL_TABLET" ] || \ [ "$cpu_model" = "$INTEL_FAM6_ATOM_SALTWELL_MID" ] || \ [ "$cpu_model" = "$INTEL_FAM6_ATOM_BONNELL" ] || \ [ "$cpu_model" = "$INTEL_FAM6_ATOM_BONNELL_MID" ] || \ [ "$cpu_model" = "$INTEL_FAM6_ATOM_SILVERMONT" ] || \ [ "$cpu_model" = "$INTEL_FAM6_ATOM_SILVERMONT_D" ] || \ [ "$cpu_model" = "$INTEL_FAM6_ATOM_SILVERMONT_MID" ] || \ [ "$cpu_model" = "$INTEL_FAM6_ATOM_AIRMONT" ] || \ [ "$cpu_model" = "$INTEL_FAM6_XEON_PHI_KNL" ] || \ [ "$cpu_model" = "$INTEL_FAM6_XEON_PHI_KNM" ] || \ [ "$cpu_model" = "$INTEL_FAM6_ATOM_AIRMONT_MID" ] || \ [ "$cpu_model" = "$INTEL_FAM6_ATOM_GOLDMONT" ] || \ [ "$cpu_model" = "$INTEL_FAM6_ATOM_GOLDMONT_D" ] || \ [ "$cpu_model" = "$INTEL_FAM6_ATOM_GOLDMONT_PLUS" ]; then _debug "is_cpu_vulnerable: intel family 6 but model known to be immune to itlbmh" [ -z "$variant_itlbmh" ] && variant_itlbmh=immune else _debug "is_cpu_vulnerable: intel family 6 is vuln to itlbmh" variant_itlbmh=vuln fi elif [ "$cpu_family" -lt 6 ]; then _debug "is_cpu_vulnerable: intel family < 6 is immune to itlbmh" [ -z "$variant_itlbmh" ] && variant_itlbmh=immune fi else _debug "is_cpu_vulnerable: non-intel not vulnerable to itlbmh" [ -z "$variant_itlbmh" ] && variant_itlbmh=immune fi _debug "is_cpu_vulnerable: temp results are <$variant1> <$variant2> <$variant3> <$variant3a> <$variant4> <$variantl1tf>" [ "$variant1" = "immune" ] && variant1=1 || variant1=0 [ "$variant2" = "immune" ] && variant2=1 || variant2=0 [ "$variant3" = "immune" ] && variant3=1 || variant3=0 [ "$variant3a" = "immune" ] && variant3a=1 || variant3a=0 [ "$variant4" = "immune" ] && variant4=1 || variant4=0 [ "$variantl1tf" = "immune" ] && variantl1tf=1 || variantl1tf=0 [ "$variant_msbds" = "immune" ] && variant_msbds=1 || variant_msbds=0 [ "$variant_mfbds" = "immune" ] && variant_mfbds=1 || variant_mfbds=0 [ "$variant_mlpds" = "immune" ] && variant_mlpds=1 || variant_mlpds=0 [ "$variant_mdsum" = "immune" ] && variant_mdsum=1 || variant_mdsum=0 [ "$variant_taa" = "immune" ] && variant_taa=1 || variant_taa=0 [ "$variant_itlbmh" = "immune" ] && variant_itlbmh=1 || variant_itlbmh=0 [ "$variant_srbds" = "immune" ] && variant_srbds=1 || variant_srbds=0 variantl1tf_sgx="$variantl1tf" # even if we are vulnerable to L1TF, if there's no SGX, we're not vulnerable to the original foreshadow [ "$cpuid_sgx" = 0 ] && variantl1tf_sgx=1 _debug "is_cpu_vulnerable: final results are <$variant1> <$variant2> <$variant3> <$variant3a> <$variant4> <$variantl1tf> <$variantl1tf_sgx>" is_cpu_vulnerable_cached=1 _is_cpu_vulnerable_cached "$1" return $? } is_cpu_specex_free() { # return true (0) if the CPU doesn't do speculative execution, false (1) if it does. # if it's not in the list we know, return false (1). # source: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/arch/x86/kernel/cpu/common.c#n882 # { X86_VENDOR_INTEL, 6, INTEL_FAM6_ATOM_SALTWELL, X86_FEATURE_ANY }, # { X86_VENDOR_INTEL, 6, INTEL_FAM6_ATOM_SALTWELL_TABLET, X86_FEATURE_ANY }, # { X86_VENDOR_INTEL, 6, INTEL_FAM6_ATOM_BONNELL_MID, X86_FEATURE_ANY }, # { X86_VENDOR_INTEL, 6, INTEL_FAM6_ATOM_SALTWELL_MID, X86_FEATURE_ANY }, # { X86_VENDOR_INTEL, 6, INTEL_FAM6_ATOM_BONNELL, X86_FEATURE_ANY }, # { X86_VENDOR_CENTAUR, 5 }, # { X86_VENDOR_INTEL, 5 }, # { X86_VENDOR_NSC, 5 }, # { X86_VENDOR_ANY, 4 }, parse_cpu_details if is_intel; then if [ "$cpu_family" = 6 ]; then if [ "$cpu_model" = "$INTEL_FAM6_ATOM_SALTWELL" ] || \ [ "$cpu_model" = "$INTEL_FAM6_ATOM_SALTWELL_TABLET" ] || \ [ "$cpu_model" = "$INTEL_FAM6_ATOM_BONNELL_MID" ] || \ [ "$cpu_model" = "$INTEL_FAM6_ATOM_SALTWELL_MID" ] || \ [ "$cpu_model" = "$INTEL_FAM6_ATOM_BONNELL" ]; then return 0 fi elif [ "$cpu_family" = 5 ]; then return 0 fi fi [ "$cpu_family" = 4 ] && return 0 return 1 } is_cpu_mds_free() { # return true (0) if the CPU isn't affected by microarchitectural data sampling, false (1) if it does. # if it's not in the list we know, return false (1). # source: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/arch/x86/kernel/cpu/common.c #VULNWL_INTEL(ATOM_GOLDMONT, NO_MDS | NO_L1TF), #VULNWL_INTEL(ATOM_GOLDMONT_X, NO_MDS | NO_L1TF), #VULNWL_INTEL(ATOM_GOLDMONT_PLUS, NO_MDS | NO_L1TF), #/* AMD Family 0xf - 0x12 */ #VULNWL_AMD(0x0f, NO_MELTDOWN | NO_SSB | NO_L1TF | NO_MDS), #VULNWL_AMD(0x10, NO_MELTDOWN | NO_SSB | NO_L1TF | NO_MDS), #VULNWL_AMD(0x11, NO_MELTDOWN | NO_SSB | NO_L1TF | NO_MDS), #VULNWL_AMD(0x12, NO_MELTDOWN | NO_SSB | NO_L1TF | NO_MDS), #/* FAMILY_ANY must be last, otherwise 0x0f - 0x12 matches won't work */ #VULNWL_AMD(X86_FAMILY_ANY, NO_MELTDOWN | NO_L1TF | NO_MDS), #VULNWL_HYGON(X86_FAMILY_ANY, NO_MELTDOWN | NO_L1TF | NO_MDS), parse_cpu_details if is_intel; then if [ "$cpu_family" = 6 ]; then if [ "$cpu_model" = "$INTEL_FAM6_ATOM_GOLDMONT" ] || \ [ "$cpu_model" = "$INTEL_FAM6_ATOM_GOLDMONT_D" ] || \ [ "$cpu_model" = "$INTEL_FAM6_ATOM_GOLDMONT_PLUS" ]; then return 0 fi fi [ "$capabilities_mds_no" = 1 ] && return 0 fi # official statement from AMD says none of their CPUs are vulnerable # https://www.amd.com/en/corporate/product-security # https://www.amd.com/system/files/documents/security-whitepaper.pdf if is_amd; then return 0 elif is_hygon; then return 0 elif [ "$cpu_vendor" = CAVIUM ]; then return 0 elif [ "$cpu_vendor" = PHYTIUM ]; then return 0 elif [ "$cpu_vendor" = ARM ]; then return 0 fi return 1 } is_cpu_taa_free() { # return true (0) if the CPU isn't affected by tsx asynchronous aborts, false (1) if it does. # There are three types of processors that do not require additional mitigations. # 1. CPUs that do not support Intel TSX are not affected. # 2. CPUs that enumerate IA32_ARCH_CAPABILITIES[TAA_NO] (bit 8)=1 are not affected. # 3. CPUs that support Intel TSX and do not enumerate IA32_ARCH_CAPABILITIES[MDS_NO] (bit 5)=1 # do not need additional mitigations beyond what is already required to mitigate MDS. if ! is_intel; then return 0 # is intel elif [ "$capabilities_taa_no" = 1 ] || [ "$cpuid_rtm" = 0 ]; then return 0 fi return 1 } is_cpu_srbds_free() { # return zero (0) if the CPU isn't affected by special register buffer data sampling, one (1) if it is. # If it's not in the list we know, return one (1). # source: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/arch/x86/kernel/cpu/common.c # # A processor is affected by SRBDS if its Family_Model and stepping is in the # following list, with the exception of the listed processors # exporting MDS_NO while Intel TSX is available yet not enabled. The # latter class of processors are only affected when Intel TSX is enabled # by software using TSX_CTRL_MSR otherwise they are not affected. # # ============= ============ ======== # common name Family_Model Stepping # ============= ============ ======== # IvyBridge 06_3AH All (INTEL_FAM6_IVYBRIDGE) # # Haswell 06_3CH All (INTEL_FAM6_HASWELL) # Haswell_L 06_45H All (INTEL_FAM6_HASWELL_L) # Haswell_G 06_46H All (INTEL_FAM6_HASWELL_G) # # Broadwell_G 06_47H All (INTEL_FAM6_BROADWELL_G) # Broadwell 06_3DH All (INTEL_FAM6_BROADWELL) # # Skylake_L 06_4EH All (INTEL_FAM6_SKYLAKE_L) # Skylake 06_5EH All (INTEL_FAM6_SKYLAKE) # # Kabylake_L 06_8EH <=0xC (MDS_NO) (INTEL_FAM6_KABYLAKE_L) # # Kabylake 06_9EH <=0xD (MDS_NO) (INTEL_FAM6_KABYLAKE) # ============= ============ ======== parse_cpu_details if is_intel; then if [ "$cpu_family" = 6 ]; then if [ "$cpu_model" = "$INTEL_FAM6_IVYBRIDGE" ] || \ [ "$cpu_model" = "$INTEL_FAM6_HASWELL" ] || \ [ "$cpu_model" = "$INTEL_FAM6_HASWELL_L" ] || \ [ "$cpu_model" = "$INTEL_FAM6_HASWELL_G" ] || \ [ "$cpu_model" = "$INTEL_FAM6_BROADWELL_G" ] || \ [ "$cpu_model" = "$INTEL_FAM6_BROADWELL" ] || \ [ "$cpu_model" = "$INTEL_FAM6_SKYLAKE_L" ] || \ [ "$cpu_model" = "$INTEL_FAM6_SKYLAKE" ]; then return 1 elif [ "$cpu_model" = "$INTEL_FAM6_KABYLAKE_L" ] && [ "$cpu_stepping" -le 12 ] || \ [ "$cpu_model" = "$INTEL_FAM6_KABYLAKE" ] && [ "$cpu_stepping" -le 13 ]; then if [ "$capabilities_mds_no" -eq 1 ] && { [ "$cpuid_rtm" -eq 0 ] || [ "$tsx_ctrl_msr_rtm_disable" -eq 1 ] ;} ; then return 0 else return 1 fi fi fi fi return 0 } is_cpu_ssb_free() { # return true (0) if the CPU isn't affected by speculative store bypass, false (1) if it does. # if it's not in the list we know, return false (1). # source1: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/arch/x86/kernel/cpu/common.c#n945 # source2: https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git/tree/arch/x86/kernel/cpu/common.c # Only list CPUs that speculate but are immune, to avoid duplication of cpus listed in is_cpu_specex_free() #{ X86_VENDOR_INTEL, 6, INTEL_FAM6_ATOM_SILVERMONT }, #{ X86_VENDOR_INTEL, 6, INTEL_FAM6_ATOM_AIRMONT }, #{ X86_VENDOR_INTEL, 6, INTEL_FAM6_ATOM_SILVERMONT_X }, #{ X86_VENDOR_INTEL, 6, INTEL_FAM6_ATOM_SILVERMONT_MID }, #{ X86_VENDOR_INTEL, 6, INTEL_FAM6_CORE_YONAH }, #{ X86_VENDOR_INTEL, 6, INTEL_FAM6_XEON_PHI_KNL }, #{ X86_VENDOR_INTEL, 6, INTEL_FAM6_XEON_PHI_KNM }, #{ X86_VENDOR_AMD, 0x12, }, #{ X86_VENDOR_AMD, 0x11, }, #{ X86_VENDOR_AMD, 0x10, }, #{ X86_VENDOR_AMD, 0xf, }, parse_cpu_details if is_intel; then if [ "$cpu_family" = 6 ]; then if [ "$cpu_model" = "$INTEL_FAM6_ATOM_AIRMONT" ] || \ [ "$cpu_model" = "$INTEL_FAM6_ATOM_SILVERMONT" ] || \ [ "$cpu_model" = "$INTEL_FAM6_ATOM_SILVERMONT_D" ] || \ [ "$cpu_model" = "$INTEL_FAM6_ATOM_SILVERMONT_MID" ]; then return 0 elif [ "$cpu_model" = "$INTEL_FAM6_CORE_YONAH" ] || \ [ "$cpu_model" = "$INTEL_FAM6_XEON_PHI_KNL" ] || \ [ "$cpu_model" = "$INTEL_FAM6_XEON_PHI_KNM" ]; then return 0 fi fi fi if is_amd; then if [ "$cpu_family" = "18" ] || \ [ "$cpu_family" = "17" ] || \ [ "$cpu_family" = "16" ] || \ [ "$cpu_family" = "15" ]; then return 0 fi fi if is_hygon; then return 1 fi [ "$cpu_family" = 4 ] && return 0 return 1 } show_header() { _info "Spectre and Meltdown mitigation detection tool v$VERSION" _info } [ -z "$HOME" ] && HOME="$(getent passwd "$(whoami)" | cut -d: -f6)" mcedb_cache="$HOME/.mcedb" update_fwdb() { show_header if [ -r "$mcedb_cache" ]; then previous_dbversion=$(awk '/^# %%% MCEDB / { print $4 }' "$mcedb_cache") fi # first, download the MCE.db from the excellent platomav's MCExtractor project mcedb_tmp="$(mktemp /tmp/mcedb-XXXXXX)" mcedb_url='https://github.com/platomav/MCExtractor/raw/master/MCE.db' _info_nol "Fetching MCE.db from the MCExtractor project... " if command -v wget >/dev/null 2>&1; then wget -q "$mcedb_url" -O "$mcedb_tmp"; ret=$? elif command -v curl >/dev/null 2>&1; then curl -sL "$mcedb_url" -o "$mcedb_tmp"; ret=$? elif command -v fetch >/dev/null 2>&1; then fetch -q "$mcedb_url" -o "$mcedb_tmp"; ret=$? else echo ERROR "please install one of \`wget\`, \`curl\` of \`fetch\` programs" return 1 fi if [ "$ret" != 0 ]; then echo ERROR "error $ret while downloading MCE.db" return $ret fi echo DONE # second, get the Intel firmwares from GitHub intel_tmp="$(mktemp -d /tmp/intelfw-XXXXXX)" intel_url="https://github.com/intel/Intel-Linux-Processor-Microcode-Data-Files/archive/main.zip" _info_nol "Fetching Intel firmwares... " ## https://github.com/intel/Intel-Linux-Processor-Microcode-Data-Files.git if command -v wget >/dev/null 2>&1; then wget -q "$intel_url" -O "$intel_tmp/fw.zip"; ret=$? elif command -v curl >/dev/null 2>&1; then curl -sL "$intel_url" -o "$intel_tmp/fw.zip"; ret=$? elif command -v fetch >/dev/null 2>&1; then fetch -q "$intel_url" -o "$intel_tmp/fw.zip"; ret=$? else echo ERROR "please install one of \`wget\`, \`curl\` of \`fetch\` programs" return 1 fi if [ "$ret" != 0 ]; then echo ERROR "error $ret while downloading Intel firmwares" return $ret fi echo DONE # now extract MCEdb contents using sqlite _info_nol "Extracting MCEdb data... " if ! command -v sqlite3 >/dev/null 2>&1; then echo ERROR "please install the \`sqlite3\` program" return 1 fi mcedb_revision=$(sqlite3 "$mcedb_tmp" "select revision from MCE") mcedb_date=$(sqlite3 "$mcedb_tmp" "select strftime('%Y/%m/%d', date, 'unixepoch') from MCE") if [ -z "$mcedb_revision" ]; then echo ERROR "downloaded file seems invalid" return 1 fi sqlite3 "$mcedb_tmp" "alter table Intel add column origin text" sqlite3 "$mcedb_tmp" "update Intel set origin='mce'" echo OK "MCExtractor database revision $mcedb_revision dated $mcedb_date" # parse Intel firmwares to get their versions _info_nol "Integrating Intel firmwares data to db... " if ! command -v unzip >/dev/null 2>&1; then echo ERROR "please install the \`unzip\` program" return 1 fi ( cd "$intel_tmp" && unzip fw.zip >/dev/null; ) if ! [ -d "$intel_tmp/Intel-Linux-Processor-Microcode-Data-Files-main/intel-ucode" ]; then echo ERROR "expected the 'intel-ucode' folder in the downloaded zip file" return 1 fi if ! command -v iucode_tool >/dev/null 2>&1; then if ! command -v iucode-tool >/dev/null 2>&1; then echo ERROR "please install the \`iucode-tool\` program" return 1 else iucode_tool="iucode-tool" fi else iucode_tool="iucode_tool" fi # 079/001: sig 0x000106c2, pf_mask 0x01, 2009-04-10, rev 0x0217, size 5120 # 078/004: sig 0x000106ca, pf_mask 0x10, 2009-08-25, rev 0x0107, size 5120 $iucode_tool -l "$intel_tmp/Intel-Linux-Processor-Microcode-Data-Files-main/intel-ucode" | grep -wF sig | while read -r _line do _line=$( echo "$_line" | tr -d ',') _cpuid=$( echo "$_line" | awk '{print $3}') _cpuid=$(( _cpuid )) _cpuid=$(printf "0x%08X" "$_cpuid") _date=$( echo "$_line" | awk '{print $6}' | tr -d '-') _version=$(echo "$_line" | awk '{print $8}') _version=$(( _version )) _version=$(printf "0x%08X" "$_version") _sqlstm="$(printf "INSERT INTO Intel (origin,cpuid,version,yyyymmdd) VALUES (\"%s\",\"%s\",\"%s\",\"%s\");" "intel" "$(printf "%08X" "$_cpuid")" "$(printf "%08X" "$_version")" "$_date")" sqlite3 "$mcedb_tmp" "$_sqlstm" done _intel_timestamp=$(stat -c %Y "$intel_tmp/Intel-Linux-Processor-Microcode-Data-Files-main/license" 2>/dev/null) if [ -n "$_intel_timestamp" ]; then # use this date, it matches the last commit date _intel_latest_date=$(date +%Y%m%d -d @"$_intel_timestamp") else echo "Falling back to the latest microcode date" _intel_latest_date=$(sqlite3 "$mcedb_tmp" "SELECT yyyymmdd from Intel WHERE origin = 'intel' ORDER BY yyyymmdd DESC LIMIT 1;") fi echo DONE "(version $_intel_latest_date)" dbdate=$(echo "$mcedb_date" | tr -d '/') if [ "$dbdate" -lt "$_intel_latest_date" ]; then dbdate="$_intel_latest_date" fi dbversion="$mcedb_revision.$dbdate+i$_intel_latest_date" if [ "$1" != builtin ] && [ -n "$previous_dbversion" ] && [ "$previous_dbversion" = "v$dbversion" ]; then echo "We already have this version locally, no update needed" return 0 fi _info_nol "Building local database... " { echo "# Spectre & Meltdown Checker"; echo "# %%% MCEDB v$dbversion"; sqlite3 "$mcedb_tmp" "SELECT '# I,0x'||t1.cpuid||',0x'||MAX(t1.version)||','||t1.yyyymmdd FROM Intel AS t1 LEFT OUTER JOIN Intel AS t2 ON t2.cpuid=t1.cpuid AND t2.yyyymmdd > t1.yyyymmdd WHERE t2.yyyymmdd IS NULL GROUP BY t1.cpuid ORDER BY t1.cpuid ASC;" | grep -v '^# .,0x00000000,'; sqlite3 "$mcedb_tmp" "SELECT '# A,0x'||t1.cpuid||',0x'||MAX(t1.version)||','||t1.yyyymmdd FROM AMD AS t1 LEFT OUTER JOIN AMD AS t2 ON t2.cpuid=t1.cpuid AND t2.yyyymmdd > t1.yyyymmdd WHERE t2.yyyymmdd IS NULL GROUP BY t1.cpuid ORDER BY t1.cpuid ASC;" | grep -v '^# .,0x00000000,'; } > "$mcedb_cache" echo DONE "(version $dbversion)" if [ "$1" = builtin ]; then newfile=$(mktemp /tmp/smc-XXXXXX) awk '/^# %%% MCEDB / { exit }; { print }' "$0" > "$newfile" awk '{ if (NR>1) { print } }' "$mcedb_cache" >> "$newfile" cat "$newfile" > "$0" rm -f "$newfile" fi } parse_opt_file() { # parse_opt_file option_name option_value option_name="$1" option_value="$2" if [ -z "$option_value" ]; then show_header show_usage echo "$0: error: --$option_name expects one parameter (a file)" >&2 exit 1 elif [ ! -e "$option_value" ]; then show_header echo "$0: error: couldn't find file $option_value" >&2 exit 1 elif [ ! -f "$option_value" ]; then show_header echo "$0: error: $option_value is not a file" >&2 exit 1 elif [ ! -r "$option_value" ]; then show_header echo "$0: error: couldn't read $option_value (are you root?)" >&2 exit 1 fi echo "$option_value" exit 0 } while [ -n "$1" ]; do if [ "$1" = "--kernel" ]; then opt_kernel=$(parse_opt_file kernel "$2"); ret=$? [ $ret -ne 0 ] && exit 255 shift 2 elif [ "$1" = "--config" ]; then opt_config=$(parse_opt_file config "$2"); ret=$? [ $ret -ne 0 ] && exit 255 shift 2 elif [ "$1" = "--map" ]; then opt_map=$(parse_opt_file map "$2"); ret=$? [ $ret -ne 0 ] && exit 255 shift 2 elif [ "$1" = "--arch-prefix" ]; then opt_arch_prefix="$2" shift 2 elif [ "$1" = "--live" ]; then opt_live=1 shift elif [ "$1" = "--no-color" ]; then opt_no_color=1 shift elif [ "$1" = "--no-sysfs" ]; then opt_no_sysfs=1 shift elif [ "$1" = "--sysfs-only" ]; then opt_sysfs_only=1 shift elif [ "$1" = "--coreos" ]; then opt_coreos=1 shift elif [ "$1" = "--coreos-within-toolbox" ]; then # don't use directly: used internally by --coreos opt_coreos=0 shift elif [ "$1" = "--paranoid" ]; then opt_paranoid=1 shift elif [ "$1" = "--hw-only" ]; then opt_hw_only=1 shift elif [ "$1" = "--no-hw" ]; then opt_no_hw=1 shift elif [ "$1" = "--no-explain" ]; then # deprecated, kept for compatibility opt_explain=0 shift elif [ "$1" = "--update-fwdb" ] || [ "$1" = "--update-mcedb" ]; then update_fwdb exit $? elif [ "$1" = "--update-builtin-fwdb" ] || [ "$1" = "--update-builtin-mcedb" ]; then update_fwdb builtin exit $? elif [ "$1" = "--dump-mock-data" ]; then opt_mock=1 shift elif [ "$1" = "--explain" ]; then opt_explain=1 shift elif [ "$1" = "--batch" ]; then opt_batch=1 opt_verbose=0 opt_no_color=1 shift case "$1" in text|short|nrpe|json|prometheus) opt_batch_format="$1"; shift;; --*) ;; # allow subsequent flags '') ;; # allow nothing at all *) echo "$0: error: unknown batch format '$1'" >&2 echo "$0: error: --batch expects a format from: text, nrpe, json" >&2 exit 255 ;; esac elif [ "$1" = "-v" ] || [ "$1" = "--verbose" ]; then opt_verbose=$(( opt_verbose + 1 )) [ "$opt_verbose" -ge 2 ] && opt_mock=1 shift elif [ "$1" = "--cve" ]; then if [ -z "$2" ]; then echo "$0: error: option --cve expects a parameter, supported CVEs are: $supported_cve_list" >&2 exit 255 fi selected_cve=$(echo "$supported_cve_list" | grep -iwo "$2") if [ -n "$selected_cve" ]; then opt_cve_list="$opt_cve_list $selected_cve" opt_cve_all=0 else echo "$0: error: unsupported CVE specified ('$2'), supported CVEs are: $supported_cve_list" >&2 exit 255 fi shift 2 elif [ "$1" = "--vmm" ]; then if [ -z "$2" ]; then echo "$0: error: option --vmm (auto, yes, no)" >&2 exit 255 fi case "$2" in auto) opt_vmm=-1;; yes) opt_vmm=1;; no) opt_vmm=0;; *) echo "$0: error: expected one of (auto, yes, no) to option --vmm instead of '$2'" >&2; exit 255;; esac shift 2 elif [ "$1" = "--variant" ]; then if [ -z "$2" ]; then echo "$0: error: option --variant expects a parameter (1, 2, 3, 3a, 4 or l1tf)" >&2 exit 255 fi case "$2" in 1) opt_cve_list="$opt_cve_list CVE-2017-5753"; opt_cve_all=0;; 2) opt_cve_list="$opt_cve_list CVE-2017-5715"; opt_cve_all=0;; 3) opt_cve_list="$opt_cve_list CVE-2017-5754"; opt_cve_all=0;; 3a) opt_cve_list="$opt_cve_list CVE-2018-3640"; opt_cve_all=0;; 4) opt_cve_list="$opt_cve_list CVE-2018-3639"; opt_cve_all=0;; msbds) opt_cve_list="$opt_cve_list CVE-2018-12126"; opt_cve_all=0;; mfbds) opt_cve_list="$opt_cve_list CVE-2018-12130"; opt_cve_all=0;; mlpds) opt_cve_list="$opt_cve_list CVE-2018-12127"; opt_cve_all=0;; mdsum) opt_cve_list="$opt_cve_list CVE-2019-11091"; opt_cve_all=0;; l1tf) opt_cve_list="$opt_cve_list CVE-2018-3615 CVE-2018-3620 CVE-2018-3646"; opt_cve_all=0;; taa) opt_cve_list="$opt_cve_list CVE-2019-11135"; opt_cve_all=0;; mcepsc) opt_cve_list="$opt_cve_list CVE-2018-12207"; opt_cve_all=0;; srbds) opt_cve_list="$opt_cve_list CVE-2020-0543"; opt_cve_all=0;; *) echo "$0: error: invalid parameter '$2' for --variant, expected either 1, 2, 3, 3a, 4, l1tf, msbds, mfbds, mlpds, mdsum, taa, mcepsc or srbds" >&2; exit 255 ;; esac shift 2 elif [ "$1" = "-h" ] || [ "$1" = "--help" ]; then show_header show_usage exit 0 elif [ "$1" = "--version" ]; then opt_no_color=1 show_header exit 0 elif [ "$1" = "--disclaimer" ]; then show_header show_disclaimer exit 0 else show_header show_usage echo "$0: error: unknown option '$1'" exit 255 fi done show_header if [ "$opt_no_sysfs" = 1 ] && [ "$opt_sysfs_only" = 1 ]; then _warn "Incompatible options specified (--no-sysfs and --sysfs-only), aborting" exit 255 fi if [ "$opt_no_hw" = 1 ] && [ "$opt_hw_only" = 1 ]; then _warn "Incompatible options specified (--no-hw and --hw-only), aborting" exit 255 fi if [ "$opt_live" = -1 ]; then if [ -n "$opt_kernel" ] || [ -n "$opt_config" ] || [ -n "$opt_map" ]; then # no --live specified and we have a least one of the kernel/config/map files on the cmdline: offline mode opt_live=0 else opt_live=1 fi fi # print status function pstatus() { if [ "$opt_no_color" = 1 ]; then _info_nol "$2" else case "$1" in red) col="\033[41m\033[30m";; green) col="\033[42m\033[30m";; yellow) col="\033[43m\033[30m";; blue) col="\033[44m\033[30m";; *) col="";; esac _info_nol "$col $2 \033[0m" fi [ -n "$3" ] && _info_nol " ($3)" _info unset col } # Print the final status of a vulnerability (incl. batch mode) # Arguments are: CVE UNK/OK/VULN description pvulnstatus() { pvulnstatus_last_cve="$1" if [ "$opt_batch" = 1 ]; then case "$1" in CVE-2017-5753) aka="SPECTRE VARIANT 1";; CVE-2017-5715) aka="SPECTRE VARIANT 2";; CVE-2017-5754) aka="MELTDOWN";; CVE-2018-3640) aka="VARIANT 3A";; CVE-2018-3639) aka="VARIANT 4";; CVE-2018-3615) aka="L1TF SGX";; CVE-2018-3620) aka="L1TF OS";; CVE-2018-3646) aka="L1TF VMM";; CVE-2018-12126) aka="MSBDS";; CVE-2018-12130) aka="MFBDS";; CVE-2018-12127) aka="MLPDS";; CVE-2019-11091) aka="MDSUM";; CVE-2019-11135) aka="TAA";; CVE-2018-12207) aka="ITLBMH";; CVE-2020-0543) aka="SRBDS";; *) echo "$0: error: invalid CVE '$1' passed to pvulnstatus()" >&2; exit 255;; esac case "$opt_batch_format" in text) _echo 0 "$1: $2 ($3)";; short) short_output="${short_output}$1 ";; json) case "$2" in UNK) is_vuln="null";; VULN) is_vuln="true";; OK) is_vuln="false";; *) echo "$0: error: unknown status '$2' passed to pvulnstatus()" >&2; exit 255;; esac [ -z "$json_output" ] && json_output='[' json_output="${json_output}{\"NAME\":\"$aka\",\"CVE\":\"$1\",\"VULNERABLE\":$is_vuln,\"INFOS\":\"$3\"}," ;; nrpe) [ "$2" = VULN ] && nrpe_vuln="$nrpe_vuln $1";; prometheus) prometheus_output="${prometheus_output:+$prometheus_output\n}specex_vuln_status{name=\"$aka\",cve=\"$1\",status=\"$2\",info=\"$3\"} 1" ;; *) echo "$0: error: invalid batch format '$opt_batch_format' specified" >&2; exit 255;; esac fi # always fill global_* vars because we use that do decide the program exit code case "$2" in UNK) global_unknown="1";; VULN) global_critical="1";; OK) ;; *) echo "$0: error: unknown status '$2' passed to pvulnstatus()" >&2; exit 255;; esac # display info if we're not in quiet/batch mode vulnstatus="$2" shift 2 _info_nol "> \033[46m\033[30mSTATUS:\033[0m " case "$vulnstatus" in UNK) pstatus yellow 'UNKNOWN' "$@"; final_summary="$final_summary \033[43m\033[30m$pvulnstatus_last_cve:??\033[0m";; VULN) pstatus red 'VULNERABLE' "$@"; final_summary="$final_summary \033[41m\033[30m$pvulnstatus_last_cve:KO\033[0m";; OK) pstatus green 'NOT VULNERABLE' "$@"; final_summary="$final_summary \033[42m\033[30m$pvulnstatus_last_cve:OK\033[0m";; *) echo "$0: error: unknown status '$vulnstatus' passed to pvulnstatus()" >&2; exit 255;; esac } # The 3 below functions are taken from the extract-linux script, available here: # https://github.com/torvalds/linux/blob/master/scripts/extract-vmlinux # The functions have been modified for better integration to this script # The original header of the file has been retained below # ---------------------------------------------------------------------- # extract-vmlinux - Extract uncompressed vmlinux from a kernel image # # Inspired from extract-ikconfig # (c) 2009,2010 Dick Streefland # # (c) 2011 Corentin Chary # # Licensed under the GNU General Public License, version 2 (GPLv2). # ---------------------------------------------------------------------- kernel='' kernel_err='' check_kernel() { _file="$1" _mode="$2" # checking the return code of readelf -h is not enough, we could get # a damaged ELF file and validate it, check for stderr warnings too # the warning "readelf: Warning: [16]: Link field (0) should index a symtab section./" can appear on valid kernels, ignore it _readelf_warnings=$("${opt_arch_prefix}readelf" -S "$_file" 2>&1 >/dev/null | grep -v 'should index a symtab section' | tr "\n" "/"); ret=$? _readelf_sections=$("${opt_arch_prefix}readelf" -S "$_file" 2>/dev/null | grep -c -e data -e text -e init) _kernel_size=$(stat -c %s "$_file" 2>/dev/null || stat -f %z "$_file" 2>/dev/null || echo 10000) _debug "check_kernel: ret=$? size=$_kernel_size sections=$_readelf_sections warnings=$_readelf_warnings" if [ "$_mode" = desperate ]; then if "${opt_arch_prefix}strings" "$_file" | grep -Eq '^Linux version '; then _debug "check_kernel (desperate): ... matched!" if [ "$_readelf_sections" = 0 ] && grep -qF -e armv6 -e armv7 "$_file"; then _debug "check_kernel (desperate): raw arm binary found, adjusting objdump options" objdump_options="-D -b binary -marm" else objdump_options="-d" fi return 0 else _debug "check_kernel (desperate): ... invalid" fi else if [ $ret -eq 0 ] && [ -z "$_readelf_warnings" ] && [ "$_readelf_sections" -gt 0 ]; then if [ "$_kernel_size" -ge 100000 ]; then _debug "check_kernel: ... file is valid" objdump_options="-d" return 0 else _debug "check_kernel: ... file seems valid but is too small, ignoring" fi else _debug "check_kernel: ... file is invalid" fi fi return 1 } try_decompress() { # The obscure use of the "tr" filter is to work around older versions of # "grep" that report the byte offset of the line instead of the pattern. # Try to find the header ($1) and decompress from here _debug "try_decompress: looking for $3 magic in $6" for pos in $(tr "$1\n$2" "\n$2=" < "$6" | grep -abo "^$2") do _debug "try_decompress: magic for $3 found at offset $pos" if ! command -v "$3" >/dev/null 2>&1; then if [ "$8" = 1 ]; then # pass1: if the tool is not installed, just bail out silently # and hope that the next decompression tool will be, and that # it'll happen to be the proper one for this kernel _debug "try_decompress: the '$3' tool is not installed (pass 1), try the next algo" else # pass2: if the tool is not installed, populate kernel_err this time kernel_err="missing '$3' tool, please install it, usually it's in the '$5' package" _debug "try_decompress: $kernel_err" fi return 1 fi pos=${pos%%:*} # shellcheck disable=SC2086 tail -c+$pos "$6" 2>/dev/null | $3 $4 > "$kerneltmp" 2>/dev/null; ret=$? if [ ! -s "$kerneltmp" ]; then # don't rely on $ret, sometimes it's != 0 but worked # (e.g. gunzip ret=2 just means there was trailing garbage) _debug "try_decompress: decompression with $3 failed (err=$ret)" elif check_kernel "$kerneltmp" "$7"; then kernel="$kerneltmp" _debug "try_decompress: decompressed with $3 successfully!" return 0 elif [ "$3" != "cat" ]; then _debug "try_decompress: decompression with $3 worked but result is not a kernel, trying with an offset" [ -z "$kerneltmp2" ] && kerneltmp2=$(mktemp /tmp/kernel-XXXXXX) cat "$kerneltmp" > "$kerneltmp2" try_decompress '\177ELF' xxy 'cat' '' cat "$kerneltmp2" && return 0 else _debug "try_decompress: decompression with $3 worked but result is not a kernel" fi done return 1 } extract_kernel() { [ -n "$1" ] || return 1 # Prepare temp files: kerneltmp="$(mktemp /tmp/kernel-XXXXXX)" # Initial attempt for uncompressed images or objects: if check_kernel "$1"; then _debug "extract_kernel: found kernel is valid, no decompression needed" cat "$1" > "$kerneltmp" kernel=$kerneltmp return 0 fi # That didn't work, so retry after decompression. for pass in 1 2; do for mode in normal desperate; do _debug "extract_kernel: pass $pass $mode mode" try_decompress '\037\213\010' xy gunzip '' gunzip "$1" "$mode" "$pass" && return 0 try_decompress '\002\041\114\030' xyy 'lz4' '-d -l' liblz4-tool "$1" "$mode" "$pass" && return 0 try_decompress '\3757zXZ\000' abcde unxz '' xz-utils "$1" "$mode" "$pass" && return 0 try_decompress 'BZh' xy bunzip2 '' bzip2 "$1" "$mode" "$pass" && return 0 try_decompress '\135\0\0\0' xxx unlzma '' xz-utils "$1" "$mode" "$pass" && return 0 try_decompress '\211\114\132' xy 'lzop' '-d' lzop "$1" "$mode" "$pass" && return 0 try_decompress '\177ELF' xxy 'cat' '' cat "$1" "$mode" "$pass" && return 0 try_decompress '(\265/\375' xxy unzstd '' zstd "$1" "$mode" "$pass" && return 0 done done # kernel_err might already have been populated by try_decompress() if we're missing one of the tools if [ -z "$kernel_err" ]; then kernel_err="kernel compression format is unknown or image is invalid" fi _verbose "Couldn't extract the kernel image ($kernel_err), accuracy might be reduced" return 1 } # end of extract-vmlinux functions mount_debugfs() { if [ ! -e /sys/kernel/debug/sched_features ]; then # try to mount the debugfs hierarchy ourselves and remember it to umount afterwards mount -t debugfs debugfs /sys/kernel/debug 2>/dev/null && mounted_debugfs=1 fi } load_msr() { if [ "$os" = Linux ]; then if ! grep -qw msr "$procfs/modules" 2>/dev/null; then modprobe msr 2>/dev/null && insmod_msr=1 _debug "attempted to load module msr, insmod_msr=$insmod_msr" else _debug "msr module already loaded" fi else if ! kldstat -q -m cpuctl; then kldload cpuctl 2>/dev/null && kldload_cpuctl=1 _debug "attempted to load module cpuctl, kldload_cpuctl=$kldload_cpuctl" else _debug "cpuctl module already loaded" fi fi } load_cpuid() { if [ "$os" = Linux ]; then if ! grep -qw cpuid "$procfs/modules" 2>/dev/null; then modprobe cpuid 2>/dev/null && insmod_cpuid=1 _debug "attempted to load module cpuid, insmod_cpuid=$insmod_cpuid" else _debug "cpuid module already loaded" fi else if ! kldstat -q -m cpuctl; then kldload cpuctl 2>/dev/null && kldload_cpuctl=1 _debug "attempted to load module cpuctl, kldload_cpuctl=$kldload_cpuctl" else _debug "cpuctl module already loaded" fi fi } # shellcheck disable=SC2034 EAX=1; EBX=2; ECX=3; EDX=4; read_cpuid() { # leaf is the value of the eax register when calling the cpuid instruction: _leaf="$1" # eax=1 ebx=2 ecx=3 edx=4: _register="$2" # number of bits to shift the register right to: _shift="$3" # mask to apply as an AND operand to the shifted register value _mask="$4" # wanted value (optional), if present we return 0(true) if the obtained value is equal, 1 otherwise: _wanted="$5" # in any case, the read value is globally available in $read_cpuid_value read_cpuid_value='' if [ ! -e /dev/cpu/0/cpuid ] && [ ! -e /dev/cpuctl0 ]; then # try to load the module ourselves (and remember it so we can rmmod it afterwards) load_cpuid fi if [ -e /dev/cpu/0/cpuid ]; then # Linux if [ ! -r /dev/cpu/0/cpuid ]; then return 2 fi # on some kernel versions, /dev/cpu/0/cpuid doesn't imply that the cpuid module is loaded, in that case dd returns an error dd if=/dev/cpu/0/cpuid bs=16 count=1 >/dev/null 2>&1 || load_cpuid # we need _leaf to be converted to decimal for dd _leaf=$(( _leaf )) # to avoid using iflag=skip_bytes, which doesn't exist on old versions of dd, seek to the closer multiple-of-16 _ddskip=$(( _leaf / 16 )) _odskip=$(( _leaf - _ddskip * 16 )) # now read the value _cpuid=$(dd if=/dev/cpu/0/cpuid bs=16 skip=$_ddskip count=$((_odskip + 1)) 2>/dev/null | od -j $((_odskip * 16)) -A n -t u4) elif [ -e /dev/cpuctl0 ]; then # BSD if [ ! -r /dev/cpuctl0 ]; then return 2 fi _cpuid=$(cpucontrol -i "$_leaf" /dev/cpuctl0 2>/dev/null | awk '{print $4,$5,$6,$7}') # cpuid level 0x1: 0x000306d4 0x00100800 0x4dfaebbf 0xbfebfbff else return 2 fi _debug "cpuid: leaf$_leaf on cpu0, eax-ebx-ecx-edx: $_cpuid" _mockvarname="SMC_MOCK_CPUID_${_leaf}" if [ -n "$(eval echo \$$_mockvarname)" ]; then _cpuid="$(eval echo \$$_mockvarname)" _debug "read_cpuid: MOCKING enabled for leaf $_leaf, will return $_cpuid" mocked=1 else mockme=$(printf "%b\n%b" "$mockme" "SMC_MOCK_CPUID_${_leaf}='$_cpuid'") fi [ -z "$_cpuid" ] && return 2 # get the value of the register we want _reg=$(echo "$_cpuid" | awk '{print $'"$_register"'}') # Linux returns it as decimal, BSD as hex, normalize to decimal _reg=$(( _reg )) # shellcheck disable=SC2046 _debug "cpuid: wanted register ($_register) has value $_reg aka "$(printf "%08x" "$_reg") _reg_shifted=$(( _reg >> _shift )) # shellcheck disable=SC2046 _debug "cpuid: shifted value by $_shift is $_reg_shifted aka "$(printf "%x" "$_reg_shifted") read_cpuid_value=$(( _reg_shifted & _mask )) # shellcheck disable=SC2046 _debug "cpuid: after AND $_mask, final value is $read_cpuid_value aka "$(printf "%x" "$read_cpuid_value") if [ -n "$_wanted" ]; then _debug "cpuid: wanted $_wanted and got $read_cpuid_value" if [ "$read_cpuid_value" = "$_wanted" ]; then return 0 else return 1 fi fi return 0 } dmesg_grep() { # grep for something in dmesg, ensuring that the dmesg buffer # has not been truncated dmesg_grepped='' if ! dmesg | grep -qE -e '(^|\] )Linux version [0-9]' -e '^FreeBSD is a registered' ; then # dmesg truncated return 2 fi dmesg_grepped=$(dmesg | grep -E "$1" | head -1) # not found: [ -z "$dmesg_grepped" ] && return 1 # found, output is in $dmesg_grepped return 0 } is_coreos() { command -v coreos-install >/dev/null 2>&1 && command -v toolbox >/dev/null 2>&1 && return 0 return 1 } parse_cpu_details() { [ "$parse_cpu_details_done" = 1 ] && return 0 if [ -e "$procfs/cpuinfo" ]; then cpu_vendor=$( grep '^vendor_id' "$procfs/cpuinfo" | awk '{print $3}' | head -1) cpu_friendly_name=$(grep '^model name' "$procfs/cpuinfo" | cut -d: -f2- | head -1 | sed -e 's/^ *//') # special case for ARM follows if grep -qi 'CPU implementer[[:space:]]*:[[:space:]]*0x41' "$procfs/cpuinfo"; then cpu_vendor='ARM' # some devices (phones or other) have several ARMs and as such different part numbers, # an example is "bigLITTLE", so we need to store the whole list, this is needed for is_cpu_vulnerable cpu_part_list=$(awk '/CPU part/ {print $4}' "$procfs/cpuinfo") cpu_arch_list=$(awk '/CPU architecture/ {print $3}' "$procfs/cpuinfo") # take the first one to fill the friendly name, do NOT quote the vars below # shellcheck disable=SC2086 cpu_arch=$(echo $cpu_arch_list | awk '{ print $1 }') # shellcheck disable=SC2086 cpu_part=$(echo $cpu_part_list | awk '{ print $1 }') [ "$cpu_arch" = "AArch64" ] && cpu_arch=8 cpu_friendly_name="ARM" [ -n "$cpu_arch" ] && cpu_friendly_name="$cpu_friendly_name v$cpu_arch" [ -n "$cpu_part" ] && cpu_friendly_name="$cpu_friendly_name model $cpu_part" elif grep -qi 'CPU implementer[[:space:]]*:[[:space:]]*0x43' "$procfs/cpuinfo"; then cpu_vendor='CAVIUM' elif grep -qi 'CPU implementer[[:space:]]*:[[:space:]]*0x70' "$procfs/cpuinfo"; then cpu_vendor='PHYTIUM' fi cpu_family=$( grep '^cpu family' "$procfs/cpuinfo" | awk '{print $4}' | grep -E '^[0-9]+$' | head -1) cpu_model=$( grep '^model' "$procfs/cpuinfo" | awk '{print $3}' | grep -E '^[0-9]+$' | head -1) cpu_stepping=$(grep '^stepping' "$procfs/cpuinfo" | awk '{print $3}' | grep -E '^[0-9]+$' | head -1) cpu_ucode=$( grep '^microcode' "$procfs/cpuinfo" | awk '{print $3}' | head -1) else cpu_vendor=$( dmesg | grep -i -m1 'Origin=' | cut -f2 -w | cut -f2 -d= | cut -f2 -d\" ) cpu_family=$( dmesg | grep -i -m1 'Family=' | cut -f4 -w | cut -f2 -d= ) cpu_family=$(( cpu_family )) cpu_model=$( dmesg | grep -i -m1 'Model=' | cut -f5 -w | cut -f2 -d= ) cpu_model=$(( cpu_model )) cpu_stepping=$( dmesg | grep -i -m1 'Stepping=' | cut -f6 -w | cut -f2 -d= ) cpu_friendly_name=$(sysctl -n hw.model 2>/dev/null) fi if [ -n "$SMC_MOCK_CPU_FRIENDLY_NAME" ]; then cpu_friendly_name="$SMC_MOCK_CPU_FRIENDLY_NAME" _debug "parse_cpu_details: MOCKING cpu friendly name to $cpu_friendly_name" mocked=1 else mockme=$(printf "%b\n%b" "$mockme" "SMC_MOCK_CPU_FRIENDLY_NAME='$cpu_friendly_name'") fi if [ -n "$SMC_MOCK_CPU_VENDOR" ]; then cpu_vendor="$SMC_MOCK_CPU_VENDOR" _debug "parse_cpu_details: MOCKING cpu vendor to $cpu_vendor" mocked=1 else mockme=$(printf "%b\n%b" "$mockme" "SMC_MOCK_CPU_VENDOR='$cpu_vendor'") fi if [ -n "$SMC_MOCK_CPU_FAMILY" ]; then cpu_family="$SMC_MOCK_CPU_FAMILY" _debug "parse_cpu_details: MOCKING cpu family to $cpu_family" mocked=1 else mockme=$(printf "%b\n%b" "$mockme" "SMC_MOCK_CPU_FAMILY='$cpu_family'") fi if [ -n "$SMC_MOCK_CPU_MODEL" ]; then cpu_model="$SMC_MOCK_CPU_MODEL" _debug "parse_cpu_details: MOCKING cpu model to $cpu_model" mocked=1 else mockme=$(printf "%b\n%b" "$mockme" "SMC_MOCK_CPU_MODEL='$cpu_model'") fi if [ -n "$SMC_MOCK_CPU_STEPPING" ]; then cpu_stepping="$SMC_MOCK_CPU_STEPPING" _debug "parse_cpu_details: MOCKING cpu stepping to $cpu_stepping" mocked=1 else mockme=$(printf "%b\n%b" "$mockme" "SMC_MOCK_CPU_STEPPING='$cpu_stepping'") fi # get raw cpuid, it's always useful (referenced in the Intel doc for firmware updates for example) if read_cpuid 0x1 $EAX 0 0xFFFFFFFF; then cpu_cpuid="$read_cpuid_value" else cpu_cpuid=0 fi # under BSD, linprocfs often doesn't export ucode information, so fetch it ourselves the good old way if [ -z "$cpu_ucode" ] && [ "$os" != Linux ]; then load_cpuid if [ -e /dev/cpuctl0 ]; then # init MSR with NULLs cpucontrol -m 0x8b=0 /dev/cpuctl0 # call CPUID cpucontrol -i 1 /dev/cpuctl0 >/dev/null # read MSR cpu_ucode=$(cpucontrol -m 0x8b /dev/cpuctl0 | awk '{print $3}') # convert to decimal cpu_ucode=$(( cpu_ucode )) # convert back to hex cpu_ucode=$(printf "0x%x" "$cpu_ucode") fi fi # if we got no cpu_ucode (e.g. we're in a vm), fall back to 0x0 [ -z "$cpu_ucode" ] && cpu_ucode=0x0 if [ -n "$SMC_MOCK_CPU_UCODE" ]; then cpu_ucode="$SMC_MOCK_CPU_UCODE" _debug "parse_cpu_details: MOCKING cpu ucode to $cpu_ucode" mocked=1 else mockme=$(printf "%b\n%b" "$mockme" "SMC_MOCK_CPU_UCODE='$cpu_ucode'") fi echo "$cpu_ucode" | grep -q ^0x && cpu_ucode=$(( cpu_ucode )) ucode_found=$(printf "family 0x%x model 0x%x stepping 0x%x ucode 0x%x cpuid 0x%x" "$cpu_family" "$cpu_model" "$cpu_stepping" "$cpu_ucode" "$cpu_cpuid") # also define those that we will need in other funcs # taken from https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/arch/x86/include/asm/intel-family.h # curl -s 'https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/plain/arch/x86/include/asm/intel-family.h' | awk '/#define INTEL_FAM6/ {print $2"=$(( "$3" )) # "$4,$5,$6,$7,$8,$9}' # shellcheck disable=SC2034 { INTEL_FAM6_CORE_YONAH=$(( 0x0E )) # INTEL_FAM6_CORE2_MEROM=$(( 0x0F )) # INTEL_FAM6_CORE2_MEROM_L=$(( 0x16 )) # INTEL_FAM6_CORE2_PENRYN=$(( 0x17 )) # INTEL_FAM6_CORE2_DUNNINGTON=$(( 0x1D )) # INTEL_FAM6_NEHALEM=$(( 0x1E )) # INTEL_FAM6_NEHALEM_G=$(( 0x1F )) # /* Auburndale / Havendale */ INTEL_FAM6_NEHALEM_EP=$(( 0x1A )) # INTEL_FAM6_NEHALEM_EX=$(( 0x2E )) # INTEL_FAM6_WESTMERE=$(( 0x25 )) # INTEL_FAM6_WESTMERE_EP=$(( 0x2C )) # INTEL_FAM6_WESTMERE_EX=$(( 0x2F )) # INTEL_FAM6_SANDYBRIDGE=$(( 0x2A )) # INTEL_FAM6_SANDYBRIDGE_X=$(( 0x2D )) # INTEL_FAM6_IVYBRIDGE=$(( 0x3A )) # INTEL_FAM6_IVYBRIDGE_X=$(( 0x3E )) # INTEL_FAM6_HASWELL=$(( 0x3C )) # INTEL_FAM6_HASWELL_X=$(( 0x3F )) # INTEL_FAM6_HASWELL_L=$(( 0x45 )) # INTEL_FAM6_HASWELL_G=$(( 0x46 )) # INTEL_FAM6_BROADWELL=$(( 0x3D )) # INTEL_FAM6_BROADWELL_G=$(( 0x47 )) # INTEL_FAM6_BROADWELL_X=$(( 0x4F )) # INTEL_FAM6_BROADWELL_D=$(( 0x56 )) # INTEL_FAM6_SKYLAKE_L=$(( 0x4E )) # INTEL_FAM6_SKYLAKE=$(( 0x5E )) # INTEL_FAM6_SKYLAKE_X=$(( 0x55 )) # INTEL_FAM6_KABYLAKE_L=$(( 0x8E )) # INTEL_FAM6_KABYLAKE=$(( 0x9E )) # INTEL_FAM6_CANNONLAKE_L=$(( 0x66 )) # INTEL_FAM6_ICELAKE_X=$(( 0x6A )) # INTEL_FAM6_ICELAKE_D=$(( 0x6C )) # INTEL_FAM6_ICELAKE=$(( 0x7D )) # INTEL_FAM6_ICELAKE_L=$(( 0x7E )) # INTEL_FAM6_ICELAKE_NNPI=$(( 0x9D )) # INTEL_FAM6_TIGERLAKE_L=$(( 0x8C )) # INTEL_FAM6_TIGERLAKE=$(( 0x8D )) # INTEL_FAM6_COMETLAKE=$(( 0xA5 )) # INTEL_FAM6_COMETLAKE_L=$(( 0xA6 )) # INTEL_FAM6_ATOM_BONNELL=$(( 0x1C )) # /* Diamondville, Pineview */ INTEL_FAM6_ATOM_BONNELL_MID=$(( 0x26 )) # /* Silverthorne, Lincroft */ INTEL_FAM6_ATOM_SALTWELL=$(( 0x36 )) # /* Cedarview */ INTEL_FAM6_ATOM_SALTWELL_MID=$(( 0x27 )) # /* Penwell */ INTEL_FAM6_ATOM_SALTWELL_TABLET=$(( 0x35 )) # /* Cloverview */ INTEL_FAM6_ATOM_SILVERMONT=$(( 0x37 )) # /* Bay Trail, Valleyview */ INTEL_FAM6_ATOM_SILVERMONT_D=$(( 0x4D )) # /* Avaton, Rangely */ INTEL_FAM6_ATOM_SILVERMONT_MID=$(( 0x4A )) # /* Merriefield */ INTEL_FAM6_ATOM_AIRMONT=$(( 0x4C )) # /* Cherry Trail, Braswell */ INTEL_FAM6_ATOM_AIRMONT_MID=$(( 0x5A )) # /* Moorefield */ INTEL_FAM6_ATOM_AIRMONT_NP=$(( 0x75 )) # /* Lightning Mountain */ INTEL_FAM6_ATOM_GOLDMONT=$(( 0x5C )) # /* Apollo Lake */ INTEL_FAM6_ATOM_GOLDMONT_D=$(( 0x5F )) # /* Denverton */ INTEL_FAM6_ATOM_GOLDMONT_PLUS=$(( 0x7A )) # /* Gemini Lake */ INTEL_FAM6_ATOM_TREMONT_D=$(( 0x86 )) # /* Jacobsville */ INTEL_FAM6_ATOM_TREMONT=$(( 0x96 )) # /* Elkhart Lake */ INTEL_FAM6_XEON_PHI_KNL=$(( 0x57 )) # /* Knights Landing */ INTEL_FAM6_XEON_PHI_KNM=$(( 0x85 )) # /* Knights Mill */ INTEL_FAM6_CORE_YONAH=$(( 0x0E )) } parse_cpu_details_done=1 } is_hygon() { [ "$cpu_vendor" = HygonGenuine ] && return 0 return 1 } is_amd() { [ "$cpu_vendor" = AuthenticAMD ] && return 0 return 1 } is_intel() { [ "$cpu_vendor" = GenuineIntel ] && return 0 return 1 } is_cpu_smt_enabled() { # SMT / HyperThreading is enabled if siblings != cpucores if [ -e "$procfs/cpuinfo" ]; then _siblings=$(awk '/^siblings/ {print $3;exit}' "$procfs/cpuinfo") _cpucores=$(awk '/^cpu cores/ {print $4;exit}' "$procfs/cpuinfo") if [ -n "$_siblings" ] && [ -n "$_cpucores" ]; then if [ "$_siblings" = "$_cpucores" ]; then return 1 else return 0 fi fi fi # we can't tell return 2 } is_ucode_blacklisted() { parse_cpu_details # if it's not an Intel, don't bother: it's not blacklisted is_intel || return 1 # it also needs to be family=6 [ "$cpu_family" = 6 ] || return 1 # now, check each known bad microcode # source: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/arch/x86/kernel/cpu/intel.c#n105 # 2018-02-08 update: https://newsroom.intel.com/wp-content/uploads/sites/11/2018/02/microcode-update-guidance.pdf # model,stepping,microcode for tuple in \ $INTEL_FAM6_KABYLAKE_DESKTOP,0x0B,0x80 \ $INTEL_FAM6_KABYLAKE_DESKTOP,0x0A,0x80 \ $INTEL_FAM6_KABYLAKE_DESKTOP,0x09,0x80 \ $INTEL_FAM6_KABYLAKE_MOBILE,0x0A,0x80 \ $INTEL_FAM6_KABYLAKE_MOBILE,0x09,0x80 \ $INTEL_FAM6_SKYLAKE_X,0x03,0x0100013e \ $INTEL_FAM6_SKYLAKE_X,0x04,0x02000036 \ $INTEL_FAM6_SKYLAKE_X,0x04,0x0200003a \ $INTEL_FAM6_SKYLAKE_X,0x04,0x0200003c \ $INTEL_FAM6_BROADWELL_CORE,0x04,0x28 \ $INTEL_FAM6_BROADWELL_GT3E,0x01,0x1b \ $INTEL_FAM6_BROADWELL_XEON_D,0x02,0x14 \ $INTEL_FAM6_BROADWELL_XEON_D,0x03,0x07000011 \ $INTEL_FAM6_BROADWELL_X,0x01,0x0b000023 \ $INTEL_FAM6_BROADWELL_X,0x01,0x0b000025 \ $INTEL_FAM6_HASWELL_L,0x01,0x21 \ $INTEL_FAM6_HASWELL_GT3E,0x01,0x18 \ $INTEL_FAM6_HASWELL_CORE,0x03,0x23 \ $INTEL_FAM6_HASWELL_X,0x02,0x3b \ $INTEL_FAM6_HASWELL_X,0x04,0x10 \ $INTEL_FAM6_IVYBRIDGE_X,0x04,0x42a \ $INTEL_FAM6_SANDYBRIDGE_X,0x06,0x61b \ $INTEL_FAM6_SANDYBRIDGE_X,0x07,0x712 do model=$(echo "$tuple" | cut -d, -f1) stepping=$(( $(echo "$tuple" | cut -d, -f2) )) if [ "$cpu_model" = "$model" ] && [ "$cpu_stepping" = "$stepping" ]; then ucode=$(( $(echo "$tuple" | cut -d, -f3) )) if [ "$cpu_ucode" = "$ucode" ]; then _debug "is_ucode_blacklisted: we have a match! ($cpu_model/$cpu_stepping/$cpu_ucode)" return 0 fi fi done _debug "is_ucode_blacklisted: no ($cpu_model/$cpu_stepping/$cpu_ucode)" return 1 } is_skylake_cpu() { # is this a skylake cpu? # return 0 if yes, 1 otherwise #if (boot_cpu_data.x86_vendor == X86_VENDOR_INTEL && # boot_cpu_data.x86 == 6) { # switch (boot_cpu_data.x86_model) { # case INTEL_FAM6_SKYLAKE_MOBILE: # case INTEL_FAM6_SKYLAKE_DESKTOP: # case INTEL_FAM6_SKYLAKE_X: # case INTEL_FAM6_KABYLAKE_MOBILE: # case INTEL_FAM6_KABYLAKE_DESKTOP: # return true; parse_cpu_details is_intel || return 1 [ "$cpu_family" = 6 ] || return 1 if [ "$cpu_model" = $INTEL_FAM6_SKYLAKE_L ] || \ [ "$cpu_model" = $INTEL_FAM6_SKYLAKE ] || \ [ "$cpu_model" = $INTEL_FAM6_SKYLAKE_X ] || \ [ "$cpu_model" = $INTEL_FAM6_KABYLAKE_L ] || \ [ "$cpu_model" = $INTEL_FAM6_KABYLAKE ]; then return 0 fi return 1 } is_vulnerable_to_empty_rsb() { if is_intel && [ -z "$capabilities_rsba" ]; then _warn "is_vulnerable_to_empty_rsb() called before ARCH CAPABILITIES MSR was read" fi if is_skylake_cpu || [ "$capabilities_rsba" = 1 ]; then return 0 fi return 1 } is_zen_cpu() { # is this CPU from the AMD ZEN family ? (ryzen, epyc, ...) parse_cpu_details is_amd || return 1 [ "$cpu_family" = 23 ] && return 0 return 1 } is_moksha_cpu() { parse_cpu_details is_hygon || return 1 [ "$cpu_family" = 24 ] && return 0 return 1 } # Test if the current host is a Xen PV Dom0 / DomU is_xen() { if [ ! -d "$procfs/xen" ]; then return 1 fi # XXX do we have a better way that relying on dmesg? dmesg_grep 'Booting paravirtualized kernel on Xen$'; ret=$? if [ $ret -eq 2 ]; then _warn "dmesg truncated, Xen detection will be unreliable. Please reboot and relaunch this script" return 1 elif [ $ret -eq 0 ]; then return 0 else return 1 fi } is_xen_dom0() { if ! is_xen; then return 1 fi if [ -e "$procfs/xen/capabilities" ] && grep -q "control_d" "$procfs/xen/capabilities"; then return 0 else return 1 fi } is_xen_domU() { if ! is_xen; then return 1 fi # PVHVM guests also print 'Booting paravirtualized kernel', so we need this check. dmesg_grep 'Xen HVM callback vector for event delivery is enabled$'; ret=$? if [ $ret -eq 0 ]; then return 1 fi if ! is_xen_dom0; then return 0 else return 1 fi } builtin_dbversion=$(awk '/^# %%% MCEDB / { print $4 }' "$0") if [ -r "$mcedb_cache" ]; then # we have a local cache file, but it might be older than the builtin version we have local_dbversion=$( awk '/^# %%% MCEDB / { print $4 }' "$mcedb_cache") # sort -V sorts by version number older_dbversion=$(printf "%b\n%b" "$local_dbversion" "$builtin_dbversion" | sort -V | head -n1) if [ "$older_dbversion" = "$builtin_dbversion" ]; then mcedb_source="$mcedb_cache" mcedb_info="local firmwares DB $local_dbversion" fi fi # if mcedb_source is not set, either we don't have a local cached db, or it is older than the builtin db if [ -z "$mcedb_source" ]; then mcedb_source="$0" mcedb_info="builtin firmwares DB $builtin_dbversion" fi read_mcedb() { awk '{ if (DELIM==1) { print $2 } } /^# %%% MCEDB / { DELIM=1 }' "$mcedb_source" } is_latest_known_ucode() { # 0: yes, 1: no, 2: unknown parse_cpu_details if [ "$cpu_cpuid" = 0 ]; then ucode_latest="couldn't get your cpuid" return 2 fi ucode_latest="latest microcode version for your CPU model is unknown" if is_intel; then cpu_brand_prefix=I elif is_amd; then cpu_brand_prefix=A else return 2 fi for tuple in $(read_mcedb | grep "$(printf "^$cpu_brand_prefix,0x%08X," "$cpu_cpuid")") do ucode=$(( $(echo "$tuple" | cut -d, -f3) )) ucode_date=$(echo "$tuple" | cut -d, -f4 | sed -r 's=(....)(..)(..)=\1/\2/\3=') _debug "is_latest_known_ucode: with cpuid $cpu_cpuid has ucode $cpu_ucode, last known is $ucode from $ucode_date" ucode_latest=$(printf "latest version is 0x%x dated $ucode_date according to $mcedb_info" "$ucode") if [ "$cpu_ucode" -ge "$ucode" ]; then return 0 else return 1 fi done _debug "is_latest_known_ucode: this cpuid is not referenced ($cpu_cpuid)" return 2 } get_cmdline() { if [ -n "$kernel_cmdline" ]; then return fi if [ -n "$SMC_MOCK_CMDLINE" ]; then mocked=1 _debug "get_cmdline: using mocked cmdline '$SMC_MOCK_CMDLINE'" kernel_cmdline="$SMC_MOCK_CMDLINE" return else kernel_cmdline=$(cat "$procfs/cmdline") mockme=$(printf "%b\n%b" "$mockme" "SMC_MOCK_CMDLINE='$kernel_cmdline'") fi } # ENTRYPOINT # we can't do anything useful under WSL if uname -a | grep -qE -- '-Microsoft #[0-9]+-Microsoft '; then _warn "This script doesn't work under Windows Subsystem for Linux" _warn "You should use the official Microsoft tool instead." _warn "It can be found under https://aka.ms/SpeculationControlPS" exit 1 fi # check for mode selection inconsistency if [ "$opt_hw_only" = 1 ]; then if [ "$opt_cve_all" = 0 ]; then show_usage echo "$0: error: incompatible modes specified, --hw-only vs --variant" >&2 exit 255 else opt_cve_all=0 opt_cve_list='' fi fi # coreos mode if [ "$opt_coreos" = 1 ]; then if ! is_coreos; then _warn "CoreOS mode asked, but we're not under CoreOS!" exit 255 fi _warn "CoreOS mode, starting an ephemeral toolbox to launch the script" load_msr load_cpuid mount_debugfs toolbox --ephemeral --bind-ro /dev/cpu:/dev/cpu -- sh -c "dnf install -y binutils which && /media/root$PWD/$0 $* --coreos-within-toolbox" exitcode=$? exit $exitcode else if is_coreos; then _warn "You seem to be running CoreOS, you might want to use the --coreos option for better results" _warn fi fi # if we're under a BSD, try to mount linprocfs for "$procfs/cpuinfo" procfs=/proc if echo "$os" | grep -q BSD; then _debug "We're under BSD, check if we have procfs" procfs=$(mount | awk '/^linprocfs/ { print $3; exit; }') if [ -z "$procfs" ]; then _debug "we don't, try to mount it" procfs=/proc [ -d /compat/linux/proc ] && procfs=/compat/linux/proc test -d $procfs || mkdir $procfs if mount -t linprocfs linprocfs $procfs 2>/dev/null; then mounted_procfs=1 _debug "procfs just mounted at $procfs" else procfs='' fi else _debug "We do: $procfs" fi fi parse_cpu_details get_cmdline if [ "$opt_live" = 1 ]; then # root check (only for live mode, for offline mode, we already checked if we could read the files) if [ "$(id -u)" -ne 0 ]; then _warn "Note that you should launch this script with root privileges to get accurate information." _warn "We'll proceed but you might see permission denied errors." _warn "To run it as root, you can try the following command: sudo $0" _warn fi _info "Checking for vulnerabilities on current system" _info "Kernel is \033[35m$(uname -s) $(uname -r) $(uname -v) $(uname -m)\033[0m" _info "CPU is \033[35m$cpu_friendly_name\033[0m" # try to find the image of the current running kernel if [ -n "$opt_kernel" ]; then # specified by user on cmdline, with --live, don't override : # first, look for the BOOT_IMAGE hint in the kernel cmdline elif echo "$kernel_cmdline" | grep -q 'BOOT_IMAGE='; then opt_kernel=$(echo "$kernel_cmdline" | grep -Eo 'BOOT_IMAGE=[^ ]+' | cut -d= -f2) _debug "found opt_kernel=$opt_kernel in $procfs/cmdline" # if the boot partition is within a btrfs subvolume, strip the subvolume name # if /boot is a separate subvolume, the remainder of the code in this section should handle it if echo "$opt_kernel" | grep -q "^/@"; then opt_kernel=$(echo "$opt_kernel" | sed "s:/@[^/]*::"); fi # if we have a dedicated /boot partition, our bootloader might have just called it / # so try to prepend /boot and see if we find anything [ -e "/boot/$opt_kernel" ] && opt_kernel="/boot/$opt_kernel" # special case for CoreOS if we're inside the toolbox [ -e "/media/root/boot/$opt_kernel" ] && opt_kernel="/media/root/boot/$opt_kernel" _debug "opt_kernel is now $opt_kernel" # else, the full path is already there (most probably /boot/something) fi # if we didn't find a kernel, default to guessing if [ ! -e "$opt_kernel" ]; then # Fedora: [ -e "/lib/modules/$(uname -r)/vmlinuz" ] && opt_kernel="/lib/modules/$(uname -r)/vmlinuz" # Slackware: [ -e "/boot/vmlinuz" ] && opt_kernel="/boot/vmlinuz" # Arch aarch64: [ -e "/boot/Image" ] && opt_kernel="/boot/Image" # Arch armv5/armv7: [ -e "/boot/zImage" ] && opt_kernel="/boot/zImage" # Arch arm7: [ -e "/boot/kernel7.img" ] && opt_kernel="/boot/kernel7.img" # Linux-Libre: [ -e "/boot/vmlinuz-linux-libre" ] && opt_kernel="/boot/vmlinuz-linux-libre" # pine64 [ -e "/boot/pine64/Image" ] && opt_kernel="/boot/pine64/Image" # generic: [ -e "/boot/vmlinuz-$(uname -r)" ] && opt_kernel="/boot/vmlinuz-$(uname -r)" [ -e "/boot/kernel-$( uname -r)" ] && opt_kernel="/boot/kernel-$( uname -r)" [ -e "/boot/bzImage-$(uname -r)" ] && opt_kernel="/boot/bzImage-$(uname -r)" # Gentoo: [ -e "/boot/kernel-genkernel-$(uname -m)-$(uname -r)" ] && opt_kernel="/boot/kernel-genkernel-$(uname -m)-$(uname -r)" # NixOS: [ -e "/run/booted-system/kernel" ] && opt_kernel="/run/booted-system/kernel" # systemd kernel-install: [ -e "/etc/machine-id" ] && [ -e "/boot/$(cat /etc/machine-id)/$(uname -r)/linux" ] && opt_kernel="/boot/$(cat /etc/machine-id)/$(uname -r)/linux" # Clear Linux: str_uname=$(uname -r) clear_linux_kernel="/lib/kernel/org.clearlinux.${str_uname##*.}.${str_uname%.*}" [ -e "$clear_linux_kernel" ] && opt_kernel=$clear_linux_kernel # Custom Arch seems to have the kernel path in its cmdline in the form "\directory\kernelimage", # with actual \'s instead of /'s: custom_arch_kernel=$(echo "$kernel_cmdline" | grep -Eo "(^|\s)\\\\[\\\\a-zA-Z0-9_.-]+" | tr "\\\\" "/" | tr -d '[:space:]') if [ -n "$custom_arch_kernel" ] && [ -e "$custom_arch_kernel" ]; then opt_kernel="$custom_arch_kernel" fi # FreeBSD: [ -e "/boot/kernel/kernel" ] && opt_kernel="/boot/kernel/kernel" fi # system.map if [ -n "$opt_map" ]; then # specified by user on cmdline, with --live, don't override : elif [ -e "$procfs/kallsyms" ] ; then opt_map="$procfs/kallsyms" elif [ -e "/lib/modules/$(uname -r)/System.map" ] ; then opt_map="/lib/modules/$(uname -r)/System.map" elif [ -e "/boot/System.map-$(uname -r)" ] ; then opt_map="/boot/System.map-$(uname -r)" elif [ -e "/lib/kernel/System.map-$(uname -r)" ]; then opt_map="/lib/kernel/System.map-$(uname -r)" fi # config if [ -n "$opt_config" ]; then # specified by user on cmdline, with --live, don't override : elif [ -e "$procfs/config.gz" ] ; then dumped_config="$(mktemp /tmp/config-XXXXXX)" gunzip -c "$procfs/config.gz" > "$dumped_config" # dumped_config will be deleted at the end of the script opt_config="$dumped_config" elif [ -e "/lib/modules/$(uname -r)/config" ]; then opt_config="/lib/modules/$(uname -r)/config" elif [ -e "/boot/config-$(uname -r)" ]; then opt_config="/boot/config-$(uname -r)" elif [ -e "/etc/kernels/kernel-config-$(uname -m)-$(uname -r)" ]; then opt_config="/etc/kernels/kernel-config-$(uname -m)-$(uname -r)" elif [ -e "/lib/kernel/config-$(uname -r)" ]; then opt_config="/lib/kernel/config-$(uname -r)" fi else _info "Checking for vulnerabilities against specified kernel" _info "CPU is \033[35m$cpu_friendly_name\033[0m" fi if [ -n "$opt_kernel" ]; then _verbose "Will use kernel image \033[35m$opt_kernel\033[0m" else _verbose "Will use no kernel image (accuracy might be reduced)" bad_accuracy=1 fi if [ "$os" = Linux ]; then if [ -n "$opt_config" ] && ! grep -q '^CONFIG_' "$opt_config"; then # given file is invalid! _warn "The kernel config file seems invalid, was expecting a plain-text file, ignoring it!" opt_config='' fi if [ -n "$dumped_config" ] && [ -n "$opt_config" ]; then _verbose "Will use kconfig \033[35m$procfs/config.gz (decompressed)\033[0m" elif [ -n "$opt_config" ]; then _verbose "Will use kconfig \033[35m$opt_config\033[0m" else _verbose "Will use no kconfig (accuracy might be reduced)" bad_accuracy=1 fi if [ -n "$opt_map" ]; then _verbose "Will use System.map file \033[35m$opt_map\033[0m" else _verbose "Will use no System.map file (accuracy might be reduced)" bad_accuracy=1 fi if [ "$bad_accuracy" = 1 ]; then _warn "We're missing some kernel info (see -v), accuracy might be reduced" fi fi if [ -e "$opt_kernel" ]; then if ! command -v "${opt_arch_prefix}readelf" >/dev/null 2>&1; then _debug "readelf not found" kernel_err="missing '${opt_arch_prefix}readelf' tool, please install it, usually it's in the 'binutils' package" elif [ "$opt_sysfs_only" = 1 ] || [ "$opt_hw_only" = 1 ]; then kernel_err='kernel image decompression skipped' else extract_kernel "$opt_kernel" fi else _debug "no opt_kernel defined" kernel_err="couldn't find your kernel image in /boot, if you used netboot, this is normal" fi if [ -z "$kernel" ] || [ ! -r "$kernel" ]; then [ -z "$kernel_err" ] && kernel_err="couldn't extract your kernel from $opt_kernel" else # vanilla kernels have with ^Linux version # also try harder with some kernels (such as Red Hat) that don't have ^Linux version before their version string # and check for FreeBSD kernel_version=$("${opt_arch_prefix}strings" "$kernel" 2>/dev/null | grep -E \ -e '^Linux version ' \ -e '^[[:alnum:]][^[:space:]]+ \([^[:space:]]+\) #[0-9]+ .+ (19|20)[0-9][0-9]$' \ -e '^FreeBSD [0-9]' | head -1) if [ -z "$kernel_version" ]; then # try even harder with some kernels (such as ARM) that split the release (uname -r) and version (uname -v) in 2 adjacent strings kernel_version=$("${opt_arch_prefix}strings" "$kernel" 2>/dev/null | grep -E -B1 '^#[0-9]+ .+ (19|20)[0-9][0-9]$' | tr "\n" " ") fi if [ -n "$kernel_version" ]; then # in live mode, check if the img we found is the correct one if [ "$opt_live" = 1 ]; then _verbose "Kernel image is \033[35m$kernel_version" if ! echo "$kernel_version" | grep -qF "$(uname -r)"; then _warn "Possible discrepancy between your running kernel '$(uname -r)' and the image '$kernel_version' we found ($opt_kernel), results might be incorrect" fi else _info "Kernel image is \033[35m$kernel_version" fi else _verbose "Kernel image version is unknown" fi fi _info # end of header stuff # now we define some util functions and the check_*() funcs, as # the user can choose to execute only some of those sys_interface_check() { file="$1" regex="$2" mode="$3" msg='' fullmsg='' if [ "$opt_live" = 1 ] && [ "$opt_no_sysfs" = 0 ] && [ -r "$file" ]; then : else mockme=$(printf "%b\n%b" "$mockme" "SMC_MOCK_SYSFS_$(basename "$file")_RET=1") return 1 fi _mockvarname="SMC_MOCK_SYSFS_$(basename "$file")_RET" # shellcheck disable=SC2086 if [ -n "$(eval echo \$$_mockvarname)" ]; then _debug "sysfs: MOCKING enabled for $file func returns $(eval echo \$$_mockvarname)" mocked=1 return "$(eval echo \$$_mockvarname)" fi [ -n "$regex" ] || regex='.*' _mockvarname="SMC_MOCK_SYSFS_$(basename "$file")" # shellcheck disable=SC2086 if [ -n "$(eval echo \$$_mockvarname)" ]; then fullmsg="$(eval echo \$$_mockvarname)" msg=$(echo "$fullmsg" | grep -Eo "$regex") _debug "sysfs: MOCKING enabled for $file, will return $fullmsg" mocked=1 else fullmsg=$(cat "$file") msg=$(grep -Eo "$regex" "$file") mockme=$(printf "%b\n%b" "$mockme" "SMC_MOCK_SYSFS_$(basename "$file")='$fullmsg'") fi if [ "$mode" = silent ]; then return 0 elif [ "$mode" = quiet ]; then _info "* Information from the /sys interface: $fullmsg" return 0 fi _info_nol "* Mitigated according to the /sys interface: " if echo "$msg" | grep -qi '^not affected'; then # Not affected status=OK pstatus green YES "$fullmsg" elif echo "$msg" | grep -qEi '^(kvm: )?mitigation'; then # Mitigation: PTI status=OK pstatus green YES "$fullmsg" elif echo "$msg" | grep -qi '^vulnerable'; then # Vulnerable status=VULN pstatus yellow NO "$fullmsg" else status=UNK pstatus yellow UNKNOWN "$fullmsg" fi _debug "sys_interface_check: $file=$msg (re=$regex)" return 0 } number_of_cpus() { if echo "$os" | grep -q BSD; then n=$(sysctl -n hw.ncpu 2>/dev/null || echo 1) elif [ -e "$procfs/cpuinfo" ]; then n=$(grep -c ^processor "$procfs/cpuinfo" 2>/dev/null || echo 1) else # if we don't know, default to 1 CPU n=1 fi return "$n" } # write_msr # param1 (mandatory): MSR, can be in hex or decimal. # param2 (optional): CPU index, starting from 0. Default 0. write_msr() { _msr_dec=$(( $1 )) _msr=$(printf "0x%x" "$_msr_dec") _cpu="$2" [ -z "$_cpu" ] && _cpu=0 _mockvarname="SMC_MOCK_WRMSR_${_msr}_RET" # shellcheck disable=SC2086 if [ -n "$(eval echo \$$_mockvarname)" ]; then _debug "write_msr: MOCKING enabled for msr $_msr func returns $(eval echo \$$_mockvarname)" mocked=1 [ "$(eval echo \$$_mockvarname)" = 202 ] && msr_locked_down=1 return "$(eval echo \$$_mockvarname)" fi if [ "$os" != Linux ]; then cpucontrol -m "$_msr=0" "/dev/cpuctl$_cpu" >/dev/null 2>&1; ret=$? else # for Linux # convert to decimal if [ ! -w /dev/cpu/"$_cpu"/msr ]; then ret=200 # permission error # if wrmsr is available, use it elif command -v wrmsr >/dev/null 2>&1 && [ "$SMC_NO_WRMSR" != 1 ]; then _debug "write_msr: using wrmsr" wrmsr $_msr_dec 0 2>/dev/null; ret=$? # or if we have perl, use it, any 5.x version will work elif command -v perl >/dev/null 2>&1 && [ "$SMC_NO_PERL" != 1 ]; then _debug "write_msr: using perl" ret=1 perl -e "open(M,'>','/dev/cpu/$_cpu/msr') and seek(M,$_msr_dec,0) and exit(syswrite(M,pack('H16',0)))"; [ $? -eq 8 ] && ret=0 # fallback to dd if it supports seek_bytes elif dd if=/dev/null of=/dev/null bs=8 count=1 seek="$_msr_dec" oflag=seek_bytes 2>/dev/null; then _debug "write_msr: using dd" dd if=/dev/zero of=/dev/cpu/"$_cpu"/msr bs=8 count=1 seek="$_msr_dec" oflag=seek_bytes 2>/dev/null; ret=$? else _debug "write_msr: got no wrmsr, perl or recent enough dd!" mockme=$(printf "%b\n%b" "$mockme" "SMC_MOCK_WRMSR_${_msr}_RET=201") return 201 # missing tool error fi if [ "$ret" != 0 ]; then # * Fedora (and probably Red Hat) have a "kernel lock down" feature that prevents us to write to MSRs # when this mode is enabled and EFI secure boot is enabled (see issue #303) # https://src.fedoraproject.org/rpms/kernel/blob/master/f/efi-lockdown.patch # when this happens, any write will fail and dmesg will have a msg printed "msr: Direct access to MSR" # * A version of this patch also made it to vanilla in 5.4+, in that case the message is: 'raw MSR access is restricted' # * we don't use dmesg_grep() because we don't care if dmesg is truncated here, as the message has just been printed if dmesg | grep -qF "msr: Direct access to MSR"; then _debug "write_msr: locked down kernel detected (Red Hat / Fedora)" mockme=$(printf "%b\n%b" "$mockme" "SMC_MOCK_WRMSR_${_msr}_RET=202") msr_locked_down=1 msr_locked_down_msg="your kernel is locked down (Fedora/Red Hat), please reboot without secure boot and retry" return 202 # lockdown error elif dmesg | grep -qF "raw MSR access is restricted"; then _debug "write_msr: locked down kernel detected (vanilla)" mockme=$(printf "%b\n%b" "$mockme" "SMC_MOCK_WRMSR_${_msr}_RET=202") msr_locked_down=1 msr_locked_down_msg="your kernel is locked down, please reboot with lockdown=none in the kernel cmdline and retry" return 202 # lockdown error fi fi fi # normalize ret [ "$ret" != 0 ] && ret=1 _debug "write_msr: for cpu $_cpu on msr $_msr, ret=$ret" mockme=$(printf "%b\n%b" "$mockme" "SMC_MOCK_WRMSR_${_msr}_RET=$ret") return $ret } # read_msr # param1 (mandatory): MSR, can be in hex or decimal. # param2 (optional): CPU index, starting from 0. Default 0. read_msr() { _msr_dec=$(( $1 )) _msr=$(printf "0x%x" "$_msr_dec") _cpu="$2" [ -z "$_cpu" ] && _cpu=0 read_msr_value='' _mockvarname="SMC_MOCK_RDMSR_${_msr}" # shellcheck disable=SC2086 if [ -n "$(eval echo \$$_mockvarname)" ]; then read_msr_value="$(eval echo \$$_mockvarname)" _debug "read_msr: MOCKING enabled for msr $_msr, returning $read_msr_value" mocked=1 return 0 fi _mockvarname="SMC_MOCK_RDMSR_${_msr}_RET" # shellcheck disable=SC2086 if [ -n "$(eval echo \$$_mockvarname)" ] && [ "$(eval echo \$$_mockvarname)" -ne 0 ]; then _debug "read_msr: MOCKING enabled for msr $_msr func returns $(eval echo \$$_mockvarname)" mocked=1 return "$(eval echo \$$_mockvarname)" fi if [ "$os" != Linux ]; then # for BSD _msr=$(cpucontrol -m "$_msr" "/dev/cpuctl$_cpu" 2>/dev/null); ret=$? if [ $ret -ne 0 ]; then mockme=$(printf "%b\n%b" "$mockme" "SMC_MOCK_RDMSR_${_msr}_RET=1") return 1 fi # MSR 0x10: 0x000003e1 0xb106dded _msr_h=$(echo "$_msr" | awk '{print $3}'); _msr_l=$(echo "$_msr" | awk '{print $4}'); read_msr_value=$(( _msr_h << 32 | _msr_l )) else # for Linux if [ ! -r /dev/cpu/"$_cpu"/msr ]; then mockme=$(printf "%b\n%b" "$mockme" "SMC_MOCK_RDMSR_${_msr}_RET=200") return 200 # permission error # if rdmsr is available, use it elif command -v rdmsr >/dev/null 2>&1 && [ "$SMC_NO_RDMSR" != 1 ]; then _debug "read_msr: using rdmsr on $_msr" read_msr_value=$(rdmsr -r $_msr_dec 2>/dev/null | od -t u8 -A n) # or if we have perl, use it, any 5.x version will work elif command -v perl >/dev/null 2>&1 && [ "$SMC_NO_PERL" != 1 ]; then _debug "read_msr: using perl on $_msr" read_msr_value=$(perl -e "open(M,'<','/dev/cpu/$_cpu/msr') and seek(M,$_msr_dec,0) and read(M,\$_,8) and print" | od -t u8 -A n) # fallback to dd if it supports skip_bytes elif dd if=/dev/null of=/dev/null bs=8 count=1 skip="$_msr_dec" iflag=skip_bytes 2>/dev/null; then _debug "read_msr: using dd on $_msr" read_msr_value=$(dd if=/dev/cpu/"$_cpu"/msr bs=8 count=1 skip="$_msr_dec" iflag=skip_bytes 2>/dev/null | od -t u8 -A n) else _debug "read_msr: got no rdmsr, perl or recent enough dd!" mockme=$(printf "%b\n%b" "$mockme" "SMC_MOCK_RDMSR_${_msr}_RET=201") return 201 # missing tool error fi if [ -z "$read_msr_value" ]; then # MSR doesn't exist, don't check for $? because some versions of dd still return 0! mockme=$(printf "%b\n%b" "$mockme" "SMC_MOCK_RDMSR_${_msr}_RET=1") return 1 fi # remove sparse spaces od might give us read_msr_value=$(( read_msr_value )) fi mockme=$(printf "%b\n%b" "$mockme" "SMC_MOCK_RDMSR_${_msr}='$read_msr_value'") _debug "read_msr: MSR=$_msr value is $read_msr_value" return 0 } check_cpu() { _info "\033[1;34mHardware check\033[0m" if ! uname -m | grep -qwE 'x86_64|i[3-6]86|amd64'; then return fi _info "* Hardware support (CPU microcode) for mitigation techniques" _info " * Indirect Branch Restricted Speculation (IBRS)" _info_nol " * SPEC_CTRL MSR is available: " number_of_cpus ncpus=$? idx_max_cpu=$((ncpus-1)) if [ ! -e /dev/cpu/0/msr ] && [ ! -e /dev/cpuctl0 ]; then # try to load the module ourselves (and remember it so we can rmmod it afterwards) load_msr fi if [ ! -e /dev/cpu/0/msr ] && [ ! -e /dev/cpuctl0 ]; then spec_ctrl_msr=-1 pstatus yellow UNKNOWN "is msr kernel module available?" else # the new MSR 'SPEC_CTRL' is at offset 0x48 # we check if we have it for all cpus val=0 cpu_mismatch=0 for i in $(seq 0 "$idx_max_cpu") do read_msr 0x48 "$i"; ret=$? if [ "$i" -eq 0 ]; then val=$ret else if [ "$ret" -eq $val ]; then continue else cpu_mismatch=1 fi fi done if [ $val -eq 0 ]; then if [ $cpu_mismatch -eq 0 ]; then spec_ctrl_msr=1 pstatus green YES else spec_ctrl_msr=1 pstatus green YES "But not in all CPUs" fi elif [ $val -eq 200 ]; then pstatus yellow UNKNOWN "is msr kernel module available?" spec_ctrl_msr=-1 elif [ $val -eq 201 ]; then pstatus yellow UNKNOWN "missing tool, install either msr-tools or perl" spec_ctrl_msr=-1 elif [ $val -eq 202 ]; then pstatus yellow UNKNOWN "$msr_locked_down_msg" spec_ctrl_msr=-1 else spec_ctrl_msr=0 pstatus yellow NO fi fi _info_nol " * CPU indicates IBRS capability: " # from kernel src: { X86_FEATURE_SPEC_CTRL, CPUID_EDX,26, 0x00000007, 0 }, # amd: https://developer.amd.com/wp-content/resources/Architecture_Guidelines_Update_Indirect_Branch_Control.pdf # amd: 8000_0008 EBX[14]=1 if is_intel; then read_cpuid 0x7 $EDX 26 1 1; ret=$? if [ $ret -eq 0 ]; then pstatus green YES "SPEC_CTRL feature bit" cpuid_spec_ctrl=1 cpuid_ibrs='SPEC_CTRL' fi elif is_amd || is_hygon; then read_cpuid 0x80000008 $EBX 14 1 1; ret=$? if [ $ret -eq 0 ]; then pstatus green YES "IBRS_SUPPORT feature bit" cpuid_ibrs='IBRS_SUPPORT' fi else ret=-1 pstatus yellow UNKNOWN "unknown CPU" fi if [ $ret -eq 1 ]; then pstatus yellow NO elif [ $ret -eq 2 ]; then pstatus yellow UNKNOWN "is cpuid kernel module available?" cpuid_spec_ctrl=-1 fi if is_amd || is_hygon; then _info_nol " * CPU indicates preferring IBRS always-on: " # amd or hygon read_cpuid 0x80000008 $EBX 16 1 1; ret=$? if [ $ret -eq 0 ]; then pstatus green YES else pstatus yellow NO fi _info_nol " * CPU indicates preferring IBRS over retpoline: " # amd or hygon read_cpuid 0x80000008 $EBX 18 1 1; ret=$? if [ $ret -eq 0 ]; then pstatus green YES else pstatus yellow NO fi fi # IBPB _info " * Indirect Branch Prediction Barrier (IBPB)" _info_nol " * PRED_CMD MSR is available: " if [ ! -e /dev/cpu/0/msr ] && [ ! -e /dev/cpuctl0 ]; then pstatus yellow UNKNOWN "is msr kernel module available?" elif [ ! -r /dev/cpu/0/msr ] && [ ! -w /dev/cpuctl0 ]; then pstatus yellow UNKNOWN "are you root?" else # the new MSR 'PRED_CTRL' is at offset 0x49, write-only # we test if of all cpus val=0 cpu_mismatch=0 for i in $(seq 0 "$idx_max_cpu") do write_msr 0x49 "$i"; ret=$? if [ "$i" -eq 0 ]; then val=$ret else if [ "$ret" -eq $val ]; then continue else cpu_mismatch=1 fi fi done if [ $val -eq 0 ]; then if [ $cpu_mismatch -eq 0 ]; then pstatus green YES else pstatus green YES "But not in all CPUs" fi elif [ $val -eq 200 ]; then pstatus yellow UNKNOWN "is msr kernel module available?" elif [ $val -eq 201 ]; then pstatus yellow UNKNOWN "missing tool, install either msr-tools or perl" elif [ $val -eq 202 ]; then pstatus yellow UNKNOWN "$msr_locked_down_msg" else pstatus yellow NO fi fi _info_nol " * CPU indicates IBPB capability: " # CPUID EAX=0x80000008, ECX=0x00 return EBX[12] indicates support for just IBPB. if [ "$cpuid_spec_ctrl" = 1 ]; then # spec_ctrl implies ibpb cpuid_ibpb='SPEC_CTRL' pstatus green YES "SPEC_CTRL feature bit" elif is_intel; then if [ "$cpuid_spec_ctrl" = -1 ]; then pstatus yellow UNKNOWN "is cpuid kernel module available?" else pstatus yellow NO fi elif is_amd || is_hygon; then read_cpuid 0x80000008 $EBX 12 1 1; ret=$? if [ $ret -eq 0 ]; then cpuid_ibpb='IBPB_SUPPORT' pstatus green YES "IBPB_SUPPORT feature bit" elif [ $ret -eq 1 ]; then pstatus yellow NO else pstatus yellow UNKNOWN "is cpuid kernel module available?" fi fi # STIBP _info " * Single Thread Indirect Branch Predictors (STIBP)" _info_nol " * SPEC_CTRL MSR is available: " if [ "$spec_ctrl_msr" = 1 ]; then pstatus green YES elif [ "$spec_ctrl_msr" = 0 ]; then pstatus yellow NO else pstatus yellow UNKNOWN "is msr kernel module available?" fi _info_nol " * CPU indicates STIBP capability: " # intel: A processor supports STIBP if it enumerates CPUID (EAX=7H,ECX=0):EDX[27] as 1 # amd: 8000_0008 EBX[15]=1 if is_intel; then read_cpuid 0x7 $EDX 27 1 1; ret=$? if [ $ret -eq 0 ]; then pstatus green YES "Intel STIBP feature bit" #cpuid_stibp='Intel STIBP' fi elif is_amd; then read_cpuid 0x80000008 $EBX 15 1 1; ret=$? if [ $ret -eq 0 ]; then pstatus green YES "AMD STIBP feature bit" #cpuid_stibp='AMD STIBP' fi elif is_hygon; then read_cpuid 0x80000008 $EBX 15 1 1; ret=$? if [ $ret -eq 0 ]; then pstatus green YES "HYGON STIBP feature bit" #cpuid_stibp='HYGON STIBP' fi else ret=-1 pstatus yellow UNKNOWN "unknown CPU" fi if [ $ret -eq 1 ]; then pstatus yellow NO elif [ $ret -eq 2 ]; then pstatus yellow UNKNOWN "is cpuid kernel module available?" fi if is_amd || is_hygon; then _info_nol " * CPU indicates preferring STIBP always-on: " read_cpuid 0x80000008 $EBX 17 1 1; ret=$? if [ $ret -eq 0 ]; then pstatus green YES else pstatus yellow NO fi fi # variant 4 if is_intel; then _info " * Speculative Store Bypass Disable (SSBD)" _info_nol " * CPU indicates SSBD capability: " read_cpuid 0x7 $EDX 31 1 1; ret24=$?; ret25=$ret24 if [ $ret24 -eq 0 ]; then cpuid_ssbd='Intel SSBD' fi elif is_amd; then _info " * Speculative Store Bypass Disable (SSBD)" _info_nol " * CPU indicates SSBD capability: " read_cpuid 0x80000008 $EBX 24 1 1; ret24=$? read_cpuid 0x80000008 $EBX 25 1 1; ret25=$? if [ $ret24 -eq 0 ]; then cpuid_ssbd='AMD SSBD in SPEC_CTRL' #cpuid_ssbd_spec_ctrl=1 elif [ $ret25 -eq 0 ]; then cpuid_ssbd='AMD SSBD in VIRT_SPEC_CTRL' #cpuid_ssbd_virt_spec_ctrl=1 elif [ "$cpu_family" -ge 21 ] && [ "$cpu_family" -le 23 ]; then cpuid_ssbd='AMD non-architectural MSR' fi elif is_hygon; then _info " * Speculative Store Bypass Disable (SSBD)" _info_nol " * CPU indicates SSBD capability: " read_cpuid 0x80000008 $EBX 24 1 1; ret24=$? read_cpuid 0x80000008 $EBX 25 1 1; ret25=$? if [ $ret24 -eq 0 ]; then cpuid_ssbd='HYGON SSBD in SPEC_CTRL' #hygon cpuid_ssbd_spec_ctrl=1 elif [ $ret25 -eq 0 ]; then cpuid_ssbd='HYGON SSBD in VIRT_SPEC_CTRL' #hygon cpuid_ssbd_virt_spec_ctrl=1 elif [ "$cpu_family" -ge 24 ]; then cpuid_ssbd='HYGON non-architectural MSR' fi fi if [ -n "$cpuid_ssbd" ]; then pstatus green YES "$cpuid_ssbd" elif [ "$ret24" = 2 ] && [ "$ret25" = 2 ]; then pstatus yellow UNKNOWN "is cpuid kernel module available?" else pstatus yellow NO fi if is_amd; then # similar to SSB_NO for intel read_cpuid 0x80000008 $EBX 26 1 1; ret=$? if [ $ret -eq 0 ]; then amd_ssb_no=1 fi elif is_hygon; then # indicate when speculative store bypass disable is no longer needed to prevent speculative loads bypassing older stores read_cpuid 0x80000008 $EBX 26 1 1; ret=$? if [ $ret -eq 0 ]; then hygon_ssb_no=1 _debug "hygon_ssb_no=1" fi fi _info " * L1 data cache invalidation" _info_nol " * FLUSH_CMD MSR is available: " if [ ! -e /dev/cpu/0/msr ] && [ ! -e /dev/cpuctl0 ]; then pstatus yellow UNKNOWN "is msr kernel module available?" elif [ ! -r /dev/cpu/0/msr ] && [ ! -w /dev/cpuctl0 ]; then pstatus yellow UNKNOWN "are you root?" else # the new MSR 'FLUSH_CMD' is at offset 0x10b, write-only # we test if of all cpus val=0 cpu_mismatch=0 for i in $(seq 0 "$idx_max_cpu") do write_msr 0x10b "$i"; ret=$? if [ "$i" -eq 0 ]; then val=$ret else if [ "$ret" -eq $val ]; then continue else cpu_mismatch=1 fi fi done if [ $val -eq 0 ]; then if [ $cpu_mismatch -eq 0 ]; then pstatus green YES cpu_flush_cmd=1 else pstatus green YES "But not in all CPUs" fi elif [ $val -eq 200 ]; then pstatus yellow UNKNOWN "is msr kernel module available?" elif [ $val -eq 201 ]; then pstatus yellow UNKNOWN "missing tool, install either msr-tools or perl" elif [ $val -eq 202 ]; then pstatus yellow UNKNOWN "$msr_locked_down_msg" else pstatus yellow NO fi fi # CPUID of L1D _info_nol " * CPU indicates L1D flush capability: " read_cpuid 0x7 $EDX 28 1 1; ret=$? if [ $ret -eq 0 ]; then pstatus green YES "L1D flush feature bit" cpuid_l1df=1 elif [ $ret -eq 1 ]; then pstatus yellow NO elif [ $ret -eq 2 ]; then pstatus yellow UNKNOWN "is cpuid kernel module available?" fi if is_intel; then _info " * Microarchitectural Data Sampling" _info_nol " * VERW instruction is available: " read_cpuid 0x7 $EDX 10 1 1; ret=$? if [ $ret -eq 0 ]; then cpuid_md_clear=1 pstatus green YES "MD_CLEAR feature bit" elif [ $ret -eq 2 ]; then cpuid_md_clear=-1 pstatus yellow UNKNOWN "is cpuid kernel module available?" else cpuid_md_clear=0 pstatus yellow NO fi fi if is_intel; then _info " * Enhanced IBRS (IBRS_ALL)" _info_nol " * CPU indicates ARCH_CAPABILITIES MSR availability: " cpuid_arch_capabilities=-1 # A processor supports the ARCH_CAPABILITIES MSR if it enumerates CPUID (EAX=7H,ECX=0):EDX[29] as 1 read_cpuid 0x7 $EDX 29 1 1; ret=$? if [ $ret -eq 0 ]; then pstatus green YES cpuid_arch_capabilities=1 elif [ $ret -eq 2 ]; then pstatus yellow UNKNOWN "is cpuid kernel module available?" else pstatus yellow NO cpuid_arch_capabilities=0 fi _info_nol " * ARCH_CAPABILITIES MSR advertises IBRS_ALL capability: " capabilities_taa_no=-1 capabilities_mds_no=-1 capabilities_rdcl_no=-1 capabilities_ibrs_all=-1 capabilities_rsba=-1 capabilities_l1dflush_no=-1 capabilities_ssb_no=-1 capabilities_pschange_msc_no=-1 capabilities_tsx_ctrl_msr=-1 if [ "$cpuid_arch_capabilities" = -1 ]; then pstatus yellow UNKNOWN elif [ "$cpuid_arch_capabilities" != 1 ]; then capabilities_rdcl_no=0 capabilities_taa_no=0 capabilities_mds_no=0 capabilities_ibrs_all=0 capabilities_rsba=0 capabilities_l1dflush_no=0 capabilities_ssb_no=0 capabilities_pschange_msc_no=0 capabilities_tsx_ctrl_msr=0 pstatus yellow NO elif [ ! -e /dev/cpu/0/msr ] && [ ! -e /dev/cpuctl0 ]; then spec_ctrl_msr=-1 pstatus yellow UNKNOWN "is msr kernel module available?" else # the new MSR 'ARCH_CAPABILITIES' is at offset 0x10a # we check if we have it for all cpus val=0 val_cap_msr=0 cpu_mismatch=0 for i in $(seq 0 "$idx_max_cpu") do read_msr 0x10a "$i"; ret=$? capabilities=$read_msr_value if [ "$i" -eq 0 ]; then val=$ret val_cap_msr=$capabilities else if [ "$ret" -eq "$val" ] && [ "$capabilities" -eq "$val_cap_msr" ]; then continue else cpu_mismatch=1 fi fi done capabilities=$val_cap_msr capabilities_rdcl_no=0 capabilities_taa_no=0 capabilities_mds_no=0 capabilities_ibrs_all=0 capabilities_rsba=0 capabilities_l1dflush_no=0 capabilities_ssb_no=0 capabilities_pschange_msc_no=0 capabilities_tsx_ctrl_msr=0 if [ $val -eq 0 ]; then # https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/tree/arch/x86/include/asm/msr-index.h#n82 _debug "capabilities MSR is $capabilities (decimal)" [ $(( capabilities >> 0 & 1 )) -eq 1 ] && capabilities_rdcl_no=1 [ $(( capabilities >> 1 & 1 )) -eq 1 ] && capabilities_ibrs_all=1 [ $(( capabilities >> 2 & 1 )) -eq 1 ] && capabilities_rsba=1 [ $(( capabilities >> 3 & 1 )) -eq 1 ] && capabilities_l1dflush_no=1 [ $(( capabilities >> 4 & 1 )) -eq 1 ] && capabilities_ssb_no=1 [ $(( capabilities >> 5 & 1 )) -eq 1 ] && capabilities_mds_no=1 [ $(( capabilities >> 6 & 1 )) -eq 1 ] && capabilities_pschange_msc_no=1 [ $(( capabilities >> 7 & 1 )) -eq 1 ] && capabilities_tsx_ctrl_msr=1 [ $(( capabilities >> 8 & 1 )) -eq 1 ] && capabilities_taa_no=1 _debug "capabilities says rdcl_no=$capabilities_rdcl_no ibrs_all=$capabilities_ibrs_all rsba=$capabilities_rsba l1dflush_no=$capabilities_l1dflush_no ssb_no=$capabilities_ssb_no mds_no=$capabilities_mds_no taa_no=$capabilities_taa_no pschange_msc_no=$capabilities_pschange_msc_no" if [ "$capabilities_ibrs_all" = 1 ]; then if [ $cpu_mismatch -eq 0 ]; then pstatus green YES else pstatus green YES "But not in all CPUs" fi else pstatus yellow NO fi elif [ $val -eq 200 ]; then pstatus yellow UNKNOWN "is msr kernel module available?" elif [ $val -eq 201 ]; then pstatus yellow UNKNOWN "missing tool, install either msr-tools or perl" elif [ $val -eq 202 ]; then pstatus yellow UNKNOWN "$msr_locked_down_msg" else pstatus yellow NO fi fi _info_nol " * CPU explicitly indicates not being vulnerable to Meltdown/L1TF (RDCL_NO): " if [ "$capabilities_rdcl_no" = -1 ]; then pstatus yellow UNKNOWN elif [ "$capabilities_rdcl_no" = 1 ]; then pstatus green YES else pstatus yellow NO fi _info_nol " * CPU explicitly indicates not being vulnerable to Variant 4 (SSB_NO): " if [ "$capabilities_ssb_no" = -1 ]; then pstatus yellow UNKNOWN elif [ "$capabilities_ssb_no" = 1 ] || [ "$amd_ssb_no" = 1 ] || [ "$hygon_ssb_no" = 1 ]; then pstatus green YES else pstatus yellow NO fi _info_nol " * CPU/Hypervisor indicates L1D flushing is not necessary on this system: " if [ "$capabilities_l1dflush_no" = -1 ]; then pstatus yellow UNKNOWN elif [ "$capabilities_l1dflush_no" = 1 ]; then pstatus green YES else pstatus yellow NO fi _info_nol " * Hypervisor indicates host CPU might be vulnerable to RSB underflow (RSBA): " if [ "$capabilities_rsba" = -1 ]; then pstatus yellow UNKNOWN elif [ "$capabilities_rsba" = 1 ]; then pstatus yellow YES else pstatus blue NO fi _info_nol " * CPU explicitly indicates not being vulnerable to Microarchitectural Data Sampling (MDS_NO): " if [ "$capabilities_mds_no" = -1 ]; then pstatus yellow UNKNOWN elif [ "$capabilities_mds_no" = 1 ]; then pstatus green YES else pstatus yellow NO fi _info_nol " * CPU explicitly indicates not being vulnerable to TSX Asynchronous Abort (TAA_NO): " if [ "$capabilities_taa_no" = -1 ]; then pstatus yellow UNKNOWN elif [ "$capabilities_taa_no" = 1 ]; then pstatus green YES else pstatus yellow NO fi _info_nol " * CPU explicitly indicates not being vulnerable to iTLB Multihit (PSCHANGE_MSC_NO): " if [ "$capabilities_pschange_msc_no" = -1 ]; then pstatus yellow UNKNOWN elif [ "$capabilities_pschange_msc_no" = 1 ]; then pstatus green YES else pstatus yellow NO fi _info_nol " * CPU explicitly indicates having MSR for TSX control (TSX_CTRL_MSR): " if [ "$capabilities_tsx_ctrl_msr" = -1 ]; then pstatus yellow UNKNOWN elif [ "$capabilities_tsx_ctrl_msr" = 1 ]; then pstatus green YES else pstatus yellow NO fi if [ "$capabilities_tsx_ctrl_msr" = 1 ]; then read_msr 0x122 0; ret=$? if [ "$ret" = 0 ]; then tsx_ctrl_msr=$read_msr_value tsx_ctrl_msr_rtm_disable=$(( tsx_ctrl_msr >> 0 & 1 )) tsx_ctrl_msr_cpuid_clear=$(( tsx_ctrl_msr >> 1 & 1 )) fi _info_nol " * TSX_CTRL MSR indicates TSX RTM is disabled: " if [ "$tsx_ctrl_msr_rtm_disable" = 1 ]; then pstatus blue YES elif [ "$tsx_ctrl_msr_rtm_disable" = 0 ]; then pstatus blue NO else pstatus yellow UNKNOWN "couldn't read MSR" fi _info_nol " * TSX_CTRL MSR indicates TSX CPUID bit is cleared: " if [ "$tsx_ctrl_msr_cpuid_clear" = 1 ]; then pstatus blue YES elif [ "$tsx_ctrl_msr_cpuid_clear" = 0 ]; then pstatus blue NO else pstatus yellow UNKNOWN "couldn't read MSR" fi fi fi _info_nol " * CPU supports Transactional Synchronization Extensions (TSX): " ret=1 cpuid_rtm=0 if is_intel; then read_cpuid 0x7 $EBX 11 1 1; ret=$? fi if [ $ret -eq 0 ]; then cpuid_rtm=1 pstatus green YES "RTM feature bit" elif [ $ret -eq 2 ]; then cpuid_rtm=-1 pstatus yellow UNKNOWN "is cpuid kernel module available?" else pstatus yellow NO fi _info_nol " * CPU supports Software Guard Extensions (SGX): " ret=1 cpuid_sgx=0 if is_intel; then read_cpuid 0x7 $EBX 2 1 1; ret=$? fi if [ $ret -eq 0 ]; then pstatus blue YES cpuid_sgx=1 elif [ $ret -eq 2 ]; then pstatus yellow UNKNOWN "is cpuid kernel module available?" cpuid_sgx=-1 else pstatus green NO fi _info_nol " * CPU supports Special Register Buffer Data Sampling (SRBDS): " # A processor supports SRBDS if it enumerates CPUID (EAX=7H,ECX=0):EDX[9] as 1 # That means the mitigation disabling SRBDS exists ret=1 cpuid_srbds=0 srbds_on=0 if is_intel; then read_cpuid 0x7 $EDX 9 1 1; ret=$? fi if [ $ret -eq 0 ]; then pstatus blue YES cpuid_srbds=1 read_msr 0x123 0; ret=$? if [ $ret -eq 0 ]; then if [ $read_msr_value -eq 0 ]; then #SRBDS mitigation control exists and is enabled via microcode srbds_on=1 else #SRBDS mitigation control exists but is disabled via microcode srbds_on=0 fi else srbds_on=-1 fi elif [ $ret -eq 2 ]; then pstatus yellow UNKNOWN "is cpuid kernel module available?" cpuid_srbds=0 else pstatus green NO fi _info_nol " * CPU microcode is known to cause stability problems: " if is_ucode_blacklisted; then pstatus red YES "$ucode_found" _warn _warn "The microcode your CPU is running on is known to cause instability problems," _warn "such as intempestive reboots or random crashes." _warn "You are advised to either revert to a previous microcode version (that might not have" _warn "the mitigations for Spectre), or upgrade to a newer one if available." _warn else pstatus blue NO "$ucode_found" fi _info_nol " * CPU microcode is the latest known available version: " is_latest_known_ucode; ret=$? if [ $ret -eq 0 ]; then pstatus green YES "$ucode_latest" elif [ $ret -eq 1 ]; then pstatus red NO "$ucode_latest" else pstatus blue UNKNOWN "$ucode_latest" fi } check_cpu_vulnerabilities() { _info "* CPU vulnerability to the speculative execution attack variants" for cve in $supported_cve_list; do _info_nol " * Affected by $cve ($(cve2name "$cve")): " if is_cpu_vulnerable "$cve"; then pstatus yellow YES else pstatus green NO fi done } check_redhat_canonical_spectre() { # if we were already called, don't do it again [ -n "$redhat_canonical_spectre" ] && return if ! command -v "${opt_arch_prefix}strings" >/dev/null 2>&1; then redhat_canonical_spectre=-1 elif [ -n "$kernel_err" ]; then redhat_canonical_spectre=-2 else # Red Hat / Ubuntu specific variant1 patch is difficult to detect, # let's use the two same tricks than the official Red Hat detection script uses: if "${opt_arch_prefix}strings" "$kernel" | grep -qw noibrs && "${opt_arch_prefix}strings" "$kernel" | grep -qw noibpb; then # 1) detect their specific variant2 patch. If it's present, it means # that the variant1 patch is also present (both were merged at the same time) _debug "found redhat/canonical version of the variant2 patch (implies variant1)" redhat_canonical_spectre=1 elif "${opt_arch_prefix}strings" "$kernel" | grep -q 'x86/pti:'; then # 2) detect their specific variant3 patch. If it's present, but the variant2 # is not, it means that only variant1 is present in addition to variant3 _debug "found redhat/canonical version of the variant3 patch (implies variant1 but not variant2)" redhat_canonical_spectre=2 else redhat_canonical_spectre=0 fi fi } check_has_vmm() { _info_nol "* This system is a host running a hypervisor: " has_vmm=$opt_vmm if [ "$has_vmm" = -1 ] && [ "$opt_paranoid" = 1 ]; then # In paranoid mode, if --vmm was not specified on the command-line, # we want to be secure before everything else, so assume we're running # a hypervisor, as this requires more mitigations has_vmm=2 elif [ "$has_vmm" = -1 ]; then # Here, we want to know if we are hosting a hypervisor, and running some VMs on it. # If we find no evidence that this is the case, assume we're not (to avoid scaring users), # this can always be overridden with --vmm in any case. has_vmm=0 if command -v pgrep >/dev/null 2>&1; then # remove xenbus and xenwatch, also present inside domU # remove libvirtd as it can also be used to manage containers and not VMs # for each binary we want to grep, get the pids for _binary in qemu kvm xenstored xenconsoled do for _pid in $(pgrep $_binary) do # resolve the exe symlink, if it doesn't resolve with -m, # which doesn't even need the dest to exist, it means the symlink # is null, which is the case for kernel threads: ignore those to # avoid false positives (such as [kvm-irqfd-clean] under at least RHEL 7.6/7.7) if ! [ "$(readlink -m "/proc/$_pid/exe")" = "/proc/$_pid/exe" ]; then _debug "has_vmm: found PID $_pid" has_vmm=1 fi done done unset _binary _pid else # ignore SC2009 as `ps ax` is actually used as a fallback if `pgrep` isn't installed # shellcheck disable=SC2009 if ps ax | grep -vw grep | grep -q -e '\/dev/null 2>&1; then pstatus yellow UNKNOWN "missing 'perl' binary, please install it" else perl -ne '/\x0f\x83....\x48\x19\xd2\x48\x21\xd0/ and $found++; END { exit($found) }' "$kernel"; ret=$? if [ $ret -gt 0 ]; then pstatus green YES "$ret occurrence(s) found of x86 64 bits array_index_mask_nospec()" v1_mask_nospec="x86 64 bits array_index_mask_nospec" else perl -ne '/\x3b\x82..\x00\x00\x73.\x19\xd2\x21\xd0/ and $found++; END { exit($found) }' "$kernel"; ret=$? if [ $ret -gt 0 ]; then pstatus green YES "$ret occurrence(s) found of x86 32 bits array_index_mask_nospec()" v1_mask_nospec="x86 32 bits array_index_mask_nospec" else ret=$("${opt_arch_prefix}objdump" $objdump_options "$kernel" | grep -w -e f3af8014 -e e320f014 -B2 | grep -B1 -w sbc | grep -w -c cmp) if [ "$ret" -gt 0 ]; then pstatus green YES "$ret occurrence(s) found of arm 32 bits array_index_mask_nospec()" v1_mask_nospec="arm 32 bits array_index_mask_nospec" else pstatus yellow NO fi fi fi fi _info_nol "* Kernel has the Red Hat/Ubuntu patch: " check_redhat_canonical_spectre if [ "$redhat_canonical_spectre" = -1 ]; then pstatus yellow UNKNOWN "missing '${opt_arch_prefix}strings' tool, please install it, usually it's in the binutils package" elif [ "$redhat_canonical_spectre" = -2 ]; then pstatus yellow UNKNOWN "couldn't check ($kernel_err)" elif [ "$redhat_canonical_spectre" = 1 ]; then pstatus green YES elif [ "$redhat_canonical_spectre" = 2 ]; then pstatus green YES "but without IBRS" else pstatus yellow NO fi _info_nol "* Kernel has mask_nospec64 (arm64): " #.macro mask_nospec64, idx, limit, tmp #sub \tmp, \idx, \limit #bic \tmp, \tmp, \idx #and \idx, \idx, \tmp, asr #63 #csdb #.endm #$ aarch64-linux-gnu-objdump -d vmlinux | grep -w bic -A1 -B1 | grep -w sub -A2 | grep -w and -B2 #ffffff8008082e44: cb190353 sub x19, x26, x25 #ffffff8008082e48: 8a3a0273 bic x19, x19, x26 #ffffff8008082e4c: 8a93ff5a and x26, x26, x19, asr #63 #ffffff8008082e50: d503229f hint #0x14 # /!\ can also just be "csdb" instead of "hint #0x14" for native objdump # # if we have v1_mask_nospec or redhat_canonical_spectre>0, don't bother disassembling the kernel, the answer is no. if [ -n "$v1_mask_nospec" ] || [ "$redhat_canonical_spectre" -gt 0 ]; then pstatus yellow NO elif [ -n "$kernel_err" ]; then pstatus yellow UNKNOWN "couldn't check ($kernel_err)" elif ! command -v perl >/dev/null 2>&1; then pstatus yellow UNKNOWN "missing 'perl' binary, please install it" elif ! command -v "${opt_arch_prefix}objdump" >/dev/null 2>&1; then pstatus yellow UNKNOWN "missing '${opt_arch_prefix}objdump' tool, please install it, usually it's in the binutils package" else "${opt_arch_prefix}objdump" $objdump_options "$kernel" | perl -ne 'push @r, $_; /\s(hint|csdb)\s/ && $r[0]=~/\ssub\s+(x\d+)/ && $r[1]=~/\sbic\s+$1,\s+$1,/ && $r[2]=~/\sand\s/ && exit(9); shift @r if @r>3'; ret=$? if [ "$ret" -eq 9 ]; then pstatus green YES "mask_nospec64 macro is present and used" v1_mask_nospec="arm64 mask_nospec64" else pstatus yellow NO fi fi _info_nol "* Kernel has array_index_nospec (arm64): " # in 4.19+ kernels, the mask_nospec64 asm64 macro is replaced by array_index_nospec, defined in nospec.h, and used in invoke_syscall() # ffffff8008090a4c: 2a0203e2 mov w2, w2 # ffffff8008090a50: eb0200bf cmp x5, x2 # ffffff8008090a54: da1f03e2 ngc x2, xzr # ffffff8008090a58: d503229f hint #0x14 # /!\ can also just be "csdb" instead of "hint #0x14" for native objdump # # if we have v1_mask_nospec or redhat_canonical_spectre>0, don't bother disassembling the kernel, the answer is no. if [ -n "$v1_mask_nospec" ] || [ "$redhat_canonical_spectre" -gt 0 ]; then pstatus yellow NO elif [ -n "$kernel_err" ]; then pstatus yellow UNKNOWN "couldn't check ($kernel_err)" elif ! command -v perl >/dev/null 2>&1; then pstatus yellow UNKNOWN "missing 'perl' binary, please install it" elif ! command -v "${opt_arch_prefix}objdump" >/dev/null 2>&1; then pstatus yellow UNKNOWN "missing '${opt_arch_prefix}objdump' tool, please install it, usually it's in the binutils package" else "${opt_arch_prefix}objdump" -d "$kernel" | perl -ne 'push @r, $_; /\s(hint|csdb)\s/ && $r[0]=~/\smov\s+(w\d+),\s+(w\d+)/ && $r[1]=~/\scmp\s+(x\d+),\s+(x\d+)/ && $r[2]=~/\sngc\s+$2,/ && exit(9); shift @r if @r>3'; ret=$? if [ "$ret" -eq 9 ]; then pstatus green YES "array_index_nospec macro is present and used" v1_mask_nospec="arm64 array_index_nospec" else pstatus yellow NO fi fi if [ "$opt_verbose" -ge 2 ] || { [ -z "$v1_mask_nospec" ] && [ "$redhat_canonical_spectre" != 1 ] && [ "$redhat_canonical_spectre" != 2 ]; }; then # this is a slow heuristic and we don't need it if we already know the kernel is patched # but still show it in verbose mode _info_nol "* Checking count of LFENCE instructions following a jump in kernel... " if [ -n "$kernel_err" ]; then pstatus yellow UNKNOWN "couldn't check ($kernel_err)" else if ! command -v "${opt_arch_prefix}objdump" >/dev/null 2>&1; then pstatus yellow UNKNOWN "missing '${opt_arch_prefix}objdump' tool, please install it, usually it's in the binutils package" else # here we disassemble the kernel and count the number of occurrences of the LFENCE opcode # in non-patched kernels, this has been empirically determined as being around 40-50 # in patched kernels, this is more around 70-80, sometimes way higher (100+) # v0.13: 68 found in a 3.10.23-xxxx-std-ipv6-64 (with lots of modules compiled-in directly), which doesn't have the LFENCE patches, # so let's push the threshold to 70. # v0.33+: now only count lfence opcodes after a jump, way less error-prone # non patched kernel have between 0 and 20 matches, patched ones have at least 40-45 nb_lfence=$("${opt_arch_prefix}objdump" $objdump_options "$kernel" 2>/dev/null | grep -w -B1 lfence | grep -Ewc 'jmp|jne|je') if [ "$nb_lfence" -lt 30 ]; then pstatus yellow NO "only $nb_lfence jump-then-lfence instructions found, should be >= 30 (heuristic)" else v1_lfence=1 pstatus green YES "$nb_lfence jump-then-lfence instructions found, which is >= 30 (heuristic)" fi fi fi fi else # we have no sysfs but were asked to use it only! msg="/sys vulnerability interface use forced, but it's not available!" status=UNK fi # report status if ! is_cpu_vulnerable "$cve"; then # override status & msg in case CPU is not vulnerable after all pvulnstatus $cve OK "your CPU vendor reported your CPU model as not vulnerable" elif [ -z "$msg" ]; then # if msg is empty, sysfs check didn't fill it, rely on our own test if [ -n "$v1_mask_nospec" ]; then pvulnstatus $cve OK "Kernel source has been patched to mitigate the vulnerability ($v1_mask_nospec)" elif [ "$redhat_canonical_spectre" = 1 ] || [ "$redhat_canonical_spectre" = 2 ]; then pvulnstatus $cve OK "Kernel source has been patched to mitigate the vulnerability (Red Hat/Ubuntu patch)" elif [ "$v1_lfence" = 1 ]; then pvulnstatus $cve OK "Kernel source has PROBABLY been patched to mitigate the vulnerability (jump-then-lfence instructions heuristic)" elif [ -n "$kernel_err" ]; then pvulnstatus $cve UNK "Couldn't find kernel image or tools missing to execute the checks" explain "Re-run this script with root privileges, after installing the missing tools indicated above" else pvulnstatus $cve VULN "Kernel source needs to be patched to mitigate the vulnerability" explain "Your kernel is too old to have the mitigation for Variant 1, you should upgrade to a newer kernel. If you're using a Linux distro and didn't compile the kernel yourself, you should upgrade your distro to get a newer kernel." fi else if [ "$msg" = "Vulnerable" ] && [ -n "$v1_mask_nospec" ]; then pvulnstatus $cve OK "Kernel source has been patched to mitigate the vulnerability (silent backport of array_index_mask_nospec)" else if [ "$msg" = "Vulnerable" ]; then msg="Kernel source needs to be patched to mitigate the vulnerability" _explain="Your kernel is too old to have the mitigation for Variant 1, you should upgrade to a newer kernel. If you're using a Linux distro and didn't compile the kernel yourself, you should upgrade your distro to get a newer kernel." fi pvulnstatus $cve "$status" "$msg" [ -n "$_explain" ] && explain "$_explain" unset _explain fi fi } check_CVE_2017_5753_bsd() { if ! is_cpu_vulnerable "$cve"; then # override status & msg in case CPU is not vulnerable after all pvulnstatus $cve OK "your CPU vendor reported your CPU model as not vulnerable" else pvulnstatus $cve VULN "no mitigation for BSD yet" fi } ################### # SPECTRE 2 SECTION # branch target injection aka 'Spectre Variant 2' check_CVE_2017_5715() { cve='CVE-2017-5715' _info "\033[1;34m$cve aka '$(cve2name "$cve")'\033[0m" if [ "$os" = Linux ]; then check_CVE_2017_5715_linux elif echo "$os" | grep -q BSD; then check_CVE_2017_5715_bsd else _warn "Unsupported OS ($os)" fi } check_CVE_2017_5715_linux() { status=UNK sys_interface_available=0 msg='' if sys_interface_check "/sys/devices/system/cpu/vulnerabilities/spectre_v2"; then # this kernel has the /sys interface, trust it over everything sys_interface_available=1 fi if [ "$opt_sysfs_only" != 1 ]; then _info "* Mitigation 1" ibrs_can_tell=0 ibrs_supported='' ibrs_enabled='' ibpb_can_tell=0 ibpb_supported='' ibpb_enabled='' if [ "$opt_live" = 1 ]; then # in live mode, we can check for the ibrs_enabled file in debugfs # all versions of the patches have it (NOT the case of IBPB or KPTI) ibrs_can_tell=1 mount_debugfs for dir in \ /sys/kernel/debug \ /sys/kernel/debug/x86 \ "$procfs/sys/kernel"; do if [ -e "$dir/ibrs_enabled" ]; then # if the file is there, we have IBRS compiled-in # /sys/kernel/debug/ibrs_enabled: vanilla # /sys/kernel/debug/x86/ibrs_enabled: Red Hat (see https://access.redhat.com/articles/3311301) # /proc/sys/kernel/ibrs_enabled: OpenSUSE tumbleweed specex_knob_dir=$dir ibrs_supported="$dir/ibrs_enabled exists" ibrs_enabled=$(cat "$dir/ibrs_enabled" 2>/dev/null) _debug "ibrs: found $dir/ibrs_enabled=$ibrs_enabled" # if ibrs_enabled is there, ibpb_enabled will be in the same dir if [ -e "$dir/ibpb_enabled" ]; then # if the file is there, we have IBPB compiled-in (see note above for IBRS) ibpb_supported="$dir/ibpb_enabled exists" ibpb_enabled=$(cat "$dir/ibpb_enabled" 2>/dev/null) _debug "ibpb: found $dir/ibpb_enabled=$ibpb_enabled" else _debug "ibpb: $dir/ibpb_enabled file doesn't exist" fi break else _debug "ibrs: $dir/ibrs_enabled file doesn't exist" fi done # on some newer kernels, the spec_ctrl_ibrs flag in "$procfs/cpuinfo" # is set when ibrs has been administratively enabled (usually from cmdline) # which in that case means ibrs is supported *and* enabled for kernel & user # as per the ibrs patch series v3 if [ -z "$ibrs_supported" ]; then if grep ^flags "$procfs/cpuinfo" | grep -qw spec_ctrl_ibrs; then _debug "ibrs: found spec_ctrl_ibrs flag in $procfs/cpuinfo" ibrs_supported="spec_ctrl_ibrs flag in $procfs/cpuinfo" # enabled=2 -> kernel & user ibrs_enabled=2 # XXX and what about ibpb ? fi fi if [ -n "$fullmsg" ]; then # when IBPB is enabled on 4.15+, we can see it in sysfs if echo "$fullmsg" | grep -q 'IBPB'; then _debug "ibpb: found enabled in sysfs" [ -z "$ibpb_supported" ] && ibpb_supported='IBPB found enabled in sysfs' [ -z "$ibpb_enabled" ] && ibpb_enabled=1 fi # when IBRS_FW is enabled on 4.15+, we can see it in sysfs if echo "$fullmsg" | grep -q ', IBRS_FW'; then _debug "ibrs: found IBRS_FW in sysfs" [ -z "$ibrs_supported" ] && ibrs_supported='found IBRS_FW in sysfs' ibrs_fw_enabled=1 fi # when IBRS is enabled on 4.15+, we can see it in sysfs # on a more recent kernel, classic "IBRS" is not even longer an option, because of the performance impact. # only "Enhanced IBRS" is available (on CPUs with the IBRS_ALL flag) if echo "$fullmsg" | grep -q -e '\' -e 'Indirect Branch Restricted Speculation'; then _debug "ibrs: found IBRS in sysfs" [ -z "$ibrs_supported" ] && ibrs_supported='found IBRS in sysfs' [ -z "$ibrs_enabled" ] && ibrs_enabled=3 fi # checking for 'Enhanced IBRS' in sysfs, enabled on CPUs with IBRS_ALL if echo "$fullmsg" | grep -q -e 'Enhanced IBRS'; then [ -z "$ibrs_supported" ] && ibrs_supported='found Enhanced IBRS in sysfs' # 4 isn't actually a valid value of the now extinct "ibrs_enabled" flag file, # that only went from 0 to 3, so we use 4 as "enhanced ibrs is enabled" ibrs_enabled=4 fi fi # in live mode, if ibrs or ibpb is supported and we didn't find these are enabled, then they are not [ -n "$ibrs_supported" ] && [ -z "$ibrs_enabled" ] && ibrs_enabled=0 [ -n "$ibpb_supported" ] && [ -z "$ibpb_enabled" ] && ibpb_enabled=0 fi if [ -z "$ibrs_supported" ]; then check_redhat_canonical_spectre if [ "$redhat_canonical_spectre" = 1 ]; then ibrs_supported="Red Hat/Ubuntu variant" ibpb_supported="Red Hat/Ubuntu variant" fi fi if [ -z "$ibrs_supported" ] && [ -n "$kernel" ]; then if ! command -v "${opt_arch_prefix}strings" >/dev/null 2>&1; then : else ibrs_can_tell=1 ibrs_supported=$("${opt_arch_prefix}strings" "$kernel" | grep -Fw -e ', IBRS_FW' | head -1) if [ -n "$ibrs_supported" ]; then _debug "ibrs: found ibrs evidence in kernel image ($ibrs_supported)" ibrs_supported="found '$ibrs_supported' in kernel image" fi fi fi if [ -z "$ibrs_supported" ] && [ -n "$opt_map" ]; then ibrs_can_tell=1 if grep -q spec_ctrl "$opt_map"; then ibrs_supported="found spec_ctrl in symbols file" _debug "ibrs: found '*spec_ctrl*' symbol in $opt_map" fi fi # recent (4.15) vanilla kernels have IBPB but not IBRS, and without the debugfs tunables of Red Hat # we can detect it directly in the image if [ -z "$ibpb_supported" ] && [ -n "$kernel" ]; then if ! command -v "${opt_arch_prefix}strings" >/dev/null 2>&1; then : else ibpb_can_tell=1 ibpb_supported=$("${opt_arch_prefix}strings" "$kernel" | grep -Fw -e 'ibpb' -e ', IBPB' | head -1) if [ -n "$ibpb_supported" ]; then _debug "ibpb: found ibpb evidence in kernel image ($ibpb_supported)" ibpb_supported="found '$ibpb_supported' in kernel image" fi fi fi _info_nol " * Kernel is compiled with IBRS support: " if [ -z "$ibrs_supported" ]; then if [ "$ibrs_can_tell" = 1 ]; then pstatus yellow NO else # problem obtaining/inspecting kernel or strings not installed, but if the later is true, # then readelf is not installed either (both in binutils) which makes the former true, so # either way kernel_err should be set pstatus yellow UNKNOWN "couldn't check ($kernel_err)" fi else if [ "$opt_verbose" -ge 2 ]; then pstatus green YES "$ibrs_supported" else pstatus green YES fi fi _info_nol " * IBRS enabled and active: " if [ "$opt_live" = 1 ]; then if [ "$ibpb_enabled" = 2 ]; then # if ibpb=2, ibrs is forcefully=0 pstatus blue NO "IBPB used instead of IBRS in all kernel entrypoints" else # 0 means disabled # 1 is enabled only for kernel space # 2 is enabled for kernel and user space # 3 is enabled # 4 is enhanced ibrs enabled case "$ibrs_enabled" in 0) if [ "$ibrs_fw_enabled" = 1 ]; then pstatus blue YES "for firmware code only" else pstatus yellow NO fi ;; 1) if [ "$ibrs_fw_enabled" = 1 ]; then pstatus green YES "for kernel space and firmware code"; else pstatus green YES "for kernel space"; fi;; 2) if [ "$ibrs_fw_enabled" = 1 ]; then pstatus green YES "for kernel, user space, and firmware code" ; else pstatus green YES "for both kernel and user space"; fi;; 3) if [ "$ibrs_fw_enabled" = 1 ]; then pstatus green YES "for kernel and firmware code"; else pstatus green YES; fi;; 4) pstatus green YES "Enhanced flavor, performance impact will be greatly reduced";; *) if [ "$cpuid_ibrs" != 'SPEC_CTRL' ] && [ "$cpuid_ibrs" != 'IBRS_SUPPORT' ] && [ "$cpuid_spec_ctrl" != -1 ]; then pstatus yellow NO; _debug "ibrs: known cpu not supporting SPEC-CTRL or IBRS"; else pstatus yellow UNKNOWN; fi;; esac fi else pstatus blue N/A "not testable in offline mode" fi _info_nol " * Kernel is compiled with IBPB support: " if [ -z "$ibpb_supported" ]; then if [ "$ibpb_can_tell" = 1 ]; then pstatus yellow NO else # if we're in offline mode without System.map, we can't really know pstatus yellow UNKNOWN "in offline mode, we need the kernel image to be able to tell" fi else if [ "$opt_verbose" -ge 2 ]; then pstatus green YES "$ibpb_supported" else pstatus green YES fi fi _info_nol " * IBPB enabled and active: " if [ "$opt_live" = 1 ]; then case "$ibpb_enabled" in "") if [ "$ibrs_supported" = 1 ]; then pstatus yellow UNKNOWN else pstatus yellow NO fi ;; 0) pstatus yellow NO ;; 1) pstatus green YES;; 2) pstatus green YES "IBPB used instead of IBRS in all kernel entrypoints";; *) pstatus yellow UNKNOWN;; esac else pstatus blue N/A "not testable in offline mode" fi _info "* Mitigation 2" _info_nol " * Kernel has branch predictor hardening (arm): " if [ -r "$opt_config" ]; then bp_harden_can_tell=1 bp_harden=$(grep -w 'CONFIG_HARDEN_BRANCH_PREDICTOR=y' "$opt_config") if [ -n "$bp_harden" ]; then pstatus green YES _debug "bp_harden: found '$bp_harden' in $opt_config" fi fi if [ -z "$bp_harden" ] && [ -n "$opt_map" ]; then bp_harden_can_tell=1 bp_harden=$(grep -w bp_hardening_data "$opt_map") if [ -n "$bp_harden" ]; then pstatus green YES _debug "bp_harden: found '$bp_harden' in $opt_map" fi fi if [ -z "$bp_harden" ]; then if [ "$bp_harden_can_tell" = 1 ]; then pstatus yellow NO else pstatus yellow UNKNOWN fi fi _info_nol " * Kernel compiled with retpoline option: " # We check the RETPOLINE kernel options if [ -r "$opt_config" ]; then if grep -q '^CONFIG_RETPOLINE=y' "$opt_config"; then pstatus green YES retpoline=1 # shellcheck disable=SC2046 _debug 'retpoline: found '$(grep '^CONFIG_RETPOLINE' "$opt_config")" in $opt_config" else pstatus yellow NO fi else pstatus yellow UNKNOWN "couldn't read your kernel configuration" fi if [ "$retpoline" = 1 ]; then # Now check if the compiler used to compile the kernel knows how to insert retpolines in generated asm # For gcc, this is -mindirect-branch=thunk-extern (detected by the kernel makefiles) # See gcc commit https://github.com/hjl-tools/gcc/commit/23b517d4a67c02d3ef80b6109218f2aadad7bd79 # In latest retpoline LKML patches, the noretpoline_setup symbol exists only if CONFIG_RETPOLINE is set # *AND* if the compiler is retpoline-compliant, so look for that symbol # # if there is "retpoline" in the file and NOT "minimal", then it's full retpoline # (works for vanilla and Red Hat variants) if [ "$opt_live" = 1 ] && [ -n "$fullmsg" ]; then if echo "$fullmsg" | grep -qwi retpoline; then if echo "$fullmsg" | grep -qwi minimal; then retpoline_compiler=0 retpoline_compiler_reason="kernel reports minimal retpoline compilation" else retpoline_compiler=1 retpoline_compiler_reason="kernel reports full retpoline compilation" fi fi elif [ -n "$opt_map" ]; then # look for the symbol if grep -qw noretpoline_setup "$opt_map"; then retpoline_compiler=1 retpoline_compiler_reason="noretpoline_setup symbol found in System.map" fi elif [ -n "$kernel" ]; then # look for the symbol if command -v "${opt_arch_prefix}nm" >/dev/null 2>&1; then # the proper way: use nm and look for the symbol if "${opt_arch_prefix}nm" "$kernel" 2>/dev/null | grep -qw 'noretpoline_setup'; then retpoline_compiler=1 retpoline_compiler_reason="noretpoline_setup found in kernel symbols" fi elif grep -q noretpoline_setup "$kernel"; then # if we don't have nm, nevermind, the symbol name is long enough to not have # any false positive using good old grep directly on the binary retpoline_compiler=1 retpoline_compiler_reason="noretpoline_setup found in kernel" fi fi if [ -n "$retpoline_compiler" ]; then _info_nol " * Kernel compiled with a retpoline-aware compiler: " if [ "$retpoline_compiler" = 1 ]; then if [ -n "$retpoline_compiler_reason" ]; then pstatus green YES "$retpoline_compiler_reason" else pstatus green YES fi else if [ -n "$retpoline_compiler_reason" ]; then pstatus red NO "$retpoline_compiler_reason" else pstatus red NO fi fi fi fi # only Red Hat has a tunable to disable it on runtime if [ "$opt_live" = 1 ]; then if [ -e "$specex_knob_dir/retp_enabled" ]; then retp_enabled=$(cat "$specex_knob_dir/retp_enabled" 2>/dev/null) _debug "retpoline: found $specex_knob_dir/retp_enabled=$retp_enabled" _info_nol " * Retpoline is enabled: " if [ "$retp_enabled" = 1 ]; then pstatus green YES else pstatus yellow NO fi fi fi # only for information, in verbose mode if [ "$opt_verbose" -ge 2 ]; then _info_nol " * Local gcc is retpoline-aware: " if command -v gcc >/dev/null 2>&1; then if [ -n "$(gcc -mindirect-branch=thunk-extern --version 2>&1 >/dev/null)" ]; then pstatus blue NO else pstatus green YES fi else pstatus blue NO "gcc is not installed" fi fi if is_vulnerable_to_empty_rsb || [ "$opt_verbose" -ge 2 ]; then _info_nol " * Kernel supports RSB filling: " rsb_filling=0 if [ "$opt_live" = 1 ] && [ "$opt_no_sysfs" != 1 ]; then # if we're live and we aren't denied looking into /sys, let's do it if echo "$msg" | grep -qw RSB; then rsb_filling=1 pstatus green YES fi fi if [ "$rsb_filling" = 0 ]; then if [ -n "$kernel_err" ]; then pstatus yellow UNKNOWN "couldn't check ($kernel_err)" else if grep -qw -e 'Filling RSB on context switch' "$kernel"; then rsb_filling=1 pstatus green YES else rsb_filling=0 pstatus yellow NO fi fi fi fi elif [ "$sys_interface_available" = 0 ]; then # we have no sysfs but were asked to use it only! msg="/sys vulnerability interface use forced, but it's not available!" status=UNK fi if ! is_cpu_vulnerable "$cve"; then # override status & msg in case CPU is not vulnerable after all pvulnstatus $cve OK "your CPU vendor reported your CPU model as not vulnerable" else if [ "$retpoline" = 1 ] && [ "$retpoline_compiler" = 1 ] && [ "$retp_enabled" != 0 ] && [ -n "$ibpb_enabled" ] && [ "$ibpb_enabled" -ge 1 ] && ( ! is_vulnerable_to_empty_rsb || [ "$rsb_filling" = 1 ] ); then pvulnstatus $cve OK "Full retpoline + IBPB are mitigating the vulnerability" elif [ "$retpoline" = 1 ] && [ "$retpoline_compiler" = 1 ] && [ "$retp_enabled" != 0 ] && [ "$opt_paranoid" = 0 ] && ( ! is_vulnerable_to_empty_rsb || [ "$rsb_filling" = 1 ] ); then pvulnstatus $cve OK "Full retpoline is mitigating the vulnerability" if [ -n "$cpuid_ibpb" ]; then _warn "You should enable IBPB to complete retpoline as a Variant 2 mitigation" else _warn "IBPB is considered as a good addition to retpoline for Variant 2 mitigation, but your CPU microcode doesn't support it" fi elif [ -n "$ibrs_enabled" ] && [ -n "$ibpb_enabled" ] && [ "$ibrs_enabled" -ge 1 ] && [ "$ibpb_enabled" -ge 1 ]; then if [ "$ibrs_enabled" = 4 ]; then pvulnstatus $cve OK "Enhanced IBRS + IBPB are mitigating the vulnerability" else pvulnstatus $cve OK "IBRS + IBPB are mitigating the vulnerability" fi elif [ "$ibpb_enabled" = 2 ] && ! is_cpu_smt_enabled; then pvulnstatus $cve OK "Full IBPB is mitigating the vulnerability" elif [ -n "$bp_harden" ]; then pvulnstatus $cve OK "Branch predictor hardening mitigates the vulnerability" elif [ -z "$bp_harden" ] && [ "$cpu_vendor" = ARM ]; then pvulnstatus $cve VULN "Branch predictor hardening is needed to mitigate the vulnerability" explain "Your kernel has not been compiled with the CONFIG_UNMAP_KERNEL_AT_EL0 option, recompile it with this option enabled." elif [ "$opt_live" != 1 ]; then if [ "$retpoline" = 1 ] && [ -n "$ibpb_supported" ]; then pvulnstatus $cve OK "offline mode: kernel supports retpoline + IBPB to mitigate the vulnerability" elif [ -n "$ibrs_supported" ] && [ -n "$ibpb_supported" ]; then pvulnstatus $cve OK "offline mode: kernel supports IBRS + IBPB to mitigate the vulnerability" elif [ "$ibrs_can_tell" != 1 ]; then pvulnstatus $cve UNK "offline mode: not enough information" explain "Re-run this script with root privileges, and give it the kernel image (--kernel), the kernel configuration (--config) and the System.map file (--map) corresponding to the kernel you would like to inspect." fi fi # if we arrive here and didn't already call pvulnstatus, then it's VULN, let's explain why if [ "$pvulnstatus_last_cve" != "$cve" ]; then # explain what's needed for this CPU if is_vulnerable_to_empty_rsb; then pvulnstatus $cve VULN "IBRS+IBPB or retpoline+IBPB+RSB filling, is needed to mitigate the vulnerability" explain "To mitigate this vulnerability, you need either IBRS + IBPB, both requiring hardware support from your CPU microcode in addition to kernel support, or a kernel compiled with retpoline and IBPB, with retpoline requiring a retpoline-aware compiler (re-run this script with -v to know if your version of gcc is retpoline-aware) and IBPB requiring hardware support from your CPU microcode. You also need a recent-enough kernel that supports RSB filling if you plan to use retpoline. For Skylake+ CPUs, the IBRS + IBPB approach is generally preferred as it guarantees complete protection, and the performance impact is not as high as with older CPUs in comparison with retpoline. More information about how to enable the missing bits for those two possible mitigations on your system follow. You only need to take one of the two approaches." elif is_zen_cpu || is_moksha_cpu; then pvulnstatus $cve VULN "retpoline+IBPB is needed to mitigate the vulnerability" explain "To mitigate this vulnerability, You need a kernel compiled with retpoline + IBPB support, with retpoline requiring a retpoline-aware compiler (re-run this script with -v to know if your version of gcc is retpoline-aware) and IBPB requiring hardware support from your CPU microcode." elif is_intel || is_amd || is_hygon; then pvulnstatus $cve VULN "IBRS+IBPB or retpoline+IBPB is needed to mitigate the vulnerability" explain "To mitigate this vulnerability, you need either IBRS + IBPB, both requiring hardware support from your CPU microcode in addition to kernel support, or a kernel compiled with retpoline and IBPB, with retpoline requiring a retpoline-aware compiler (re-run this script with -v to know if your version of gcc is retpoline-aware) and IBPB requiring hardware support from your CPU microcode. The retpoline + IBPB approach is generally preferred as the performance impact is lower. More information about how to enable the missing bits for those two possible mitigations on your system follow. You only need to take one of the two approaches." else # in that case, we might want to trust sysfs if it's there if [ -n "$msg" ]; then [ "$msg" = Vulnerable ] && msg="no known mitigation exists for your CPU vendor ($cpu_vendor)" pvulnstatus $cve $status "$msg" else pvulnstatus $cve VULN "no known mitigation exists for your CPU vendor ($cpu_vendor)" fi fi fi # if we are in live mode, we can check for a lot more stuff and explain further if [ "$opt_live" = 1 ] && [ "$vulnstatus" != "OK" ]; then _explain_hypervisor="An updated CPU microcode will have IBRS/IBPB capabilities indicated in the Hardware Check section above. If you're running under a hypervisor (KVM, Xen, VirtualBox, VMware, ...), the hypervisor needs to be up to date to be able to export the new host CPU flags to the guest. You can run this script on the host to check if the host CPU is IBRS/IBPB. If it is, and it doesn't show up in the guest, upgrade the hypervisor. You may need to reconfigure your VM to use a CPU model that has IBRS capability; in Libvirt, such CPUs are listed with an IBRS suffix." # IBPB (amd & intel) if { [ -z "$ibpb_enabled" ] || [ "$ibpb_enabled" = 0 ]; } && { is_intel || is_amd || is_hygon; }; then if [ -z "$cpuid_ibpb" ]; then explain "The microcode of your CPU needs to be upgraded to be able to use IBPB. This is usually done at boot time by your kernel (the upgrade is not persistent across reboots which is why it's done at each boot). If you're using a distro, make sure you are up to date, as microcode updates are usually shipped alongside with the distro kernel. Availability of a microcode update for you CPU model depends on your CPU vendor. You can usually find out online if a microcode update is available for your CPU by searching for your CPUID (indicated in the Hardware Check section). $_explain_hypervisor" fi if [ -z "$ibpb_supported" ]; then explain "Your kernel doesn't have IBPB support, so you need to either upgrade your kernel (if you're using a distro) or recompiling a more recent kernel." fi if [ -n "$cpuid_ibpb" ] && [ -n "$ibpb_supported" ]; then if [ -e "$specex_knob_dir/ibpb_enabled" ]; then # newer (April 2018) Red Hat kernels have ibpb_enabled as ro, and automatically enables it with retpoline if [ ! -w "$specex_knob_dir/ibpb_enabled" ] && [ -e "$specex_knob_dir/retp_enabled" ]; then explain "Both your CPU and your kernel have IBPB support, but it is currently disabled. You kernel should enable IBPB automatically if you enable retpoline. You may enable it with \`echo 1 > $specex_knob_dir/retp_enabled\`." else explain "Both your CPU and your kernel have IBPB support, but it is currently disabled. You may enable it with \`echo 1 > $specex_knob_dir/ibpb_enabled\`." fi else explain "Both your CPU and your kernel have IBPB support, but it is currently disabled. You may enable it. Check in your distro's documentation on how to do this." fi fi elif [ "$ibpb_enabled" = 2 ] && is_cpu_smt_enabled; then explain "You have ibpb_enabled set to 2, but it only offers sufficient protection when simultaneous multi-threading (aka SMT or HyperThreading) is disabled. You should reboot your system with the kernel parameter \`nosmt\`." fi # /IBPB # IBRS (amd & intel) if { [ -z "$ibrs_enabled" ] || [ "$ibrs_enabled" = 0 ]; } && { is_intel || is_amd || is_hygon; }; then if [ -z "$cpuid_ibrs" ]; then explain "The microcode of your CPU needs to be upgraded to be able to use IBRS. This is usually done at boot time by your kernel (the upgrade is not persistent across reboots which is why it's done at each boot). If you're using a distro, make sure you are up to date, as microcode updates are usually shipped alongside with the distro kernel. Availability of a microcode update for you CPU model depends on your CPU vendor. You can usually find out online if a microcode update is available for your CPU by searching for your CPUID (indicated in the Hardware Check section). $_explain_hypervisor" fi if [ -z "$ibrs_supported" ]; then explain "Your kernel doesn't have IBRS support, so you need to either upgrade your kernel (if you're using a distro) or recompiling a more recent kernel." fi if [ -n "$cpuid_ibrs" ] && [ -n "$ibrs_supported" ]; then if [ -e "$specex_knob_dir/ibrs_enabled" ]; then explain "Both your CPU and your kernel have IBRS support, but it is currently disabled. You may enable it with \`echo 1 > $specex_knob_dir/ibrs_enabled\`." else explain "Both your CPU and your kernel have IBRS support, but it is currently disabled. You may enable it. Check in your distro's documentation on how to do this." fi fi fi # /IBRS unset _explain_hypervisor # RETPOLINE (amd & intel &hygon ) if is_amd || is_intel || is_hygon; then if [ "$retpoline" = 0 ]; then explain "Your kernel is not compiled with retpoline support, so you need to either upgrade your kernel (if you're using a distro) or recompile your kernel with the CONFIG_RETPOLINE option enabled. You also need to compile your kernel with a retpoline-aware compiler (re-run this script with -v to know if your version of gcc is retpoline-aware)." elif [ "$retpoline" = 1 ] && [ "$retpoline_compiler" = 0 ]; then explain "Your kernel is compiled with retpoline, but without a retpoline-aware compiler (re-run this script with -v to know if your version of gcc is retpoline-aware)." elif [ "$retpoline" = 1 ] && [ "$retpoline_compiler" = 1 ] && [ "$retp_enabled" = 0 ]; then explain "Your kernel has retpoline support and has been compiled with a retpoline-aware compiler, but retpoline is disabled. You should enable it with \`echo 1 > $specex_knob_dir/retp_enabled\`." fi fi # /RETPOLINE fi fi # sysfs msgs: #1 "Vulnerable" #2 "Vulnerable: Minimal generic ASM retpoline" #2 "Vulnerable: Minimal AMD ASM retpoline" # "Mitigation: Full generic retpoline" # "Mitigation: Full AMD retpoline" # $MITIGATION + ", IBPB" # $MITIGATION + ", IBRS_FW" #5 $MITIGATION + " - vulnerable module loaded" # Red Hat only: #2 "Vulnerable: Minimal ASM retpoline", #3 "Vulnerable: Retpoline without IBPB", #4 "Vulnerable: Retpoline on Skylake+", #5 "Vulnerable: Retpoline with unsafe module(s)", # "Mitigation: Full retpoline", # "Mitigation: Full retpoline and IBRS (user space)", # "Mitigation: IBRS (kernel)", # "Mitigation: IBRS (kernel and user space)", # "Mitigation: IBP disabled", } check_CVE_2017_5715_bsd() { _info "* Mitigation 1" _info_nol " * Kernel supports IBRS: " ibrs_disabled=$(sysctl -n hw.ibrs_disable 2>/dev/null) if [ -z "$ibrs_disabled" ]; then pstatus yellow NO else pstatus green YES fi _info_nol " * IBRS enabled and active: " ibrs_active=$(sysctl -n hw.ibrs_active 2>/dev/null) if [ "$ibrs_active" = 1 ]; then pstatus green YES else pstatus yellow NO fi _info "* Mitigation 2" _info_nol " * Kernel compiled with RETPOLINE: " if [ -n "$kernel_err" ]; then pstatus yellow UNKNOWN "couldn't check ($kernel_err)" else if ! command -v "${opt_arch_prefix}readelf" >/dev/null 2>&1; then pstatus yellow UNKNOWN "missing '${opt_arch_prefix}readelf' tool, please install it, usually it's in the binutils package" else nb_thunks=$("${opt_arch_prefix}readelf" -s "$kernel" | grep -c -e __llvm_retpoline_ -e __llvm_external_retpoline_ -e __x86_indirect_thunk_) if [ "$nb_thunks" -gt 0 ]; then retpoline=1 pstatus green YES "found $nb_thunks thunk(s)" else pstatus yellow NO fi fi fi if ! is_cpu_vulnerable "$cve"; then # override status & msg in case CPU is not vulnerable after all pvulnstatus $cve OK "your CPU vendor reported your CPU model as not vulnerable" elif [ "$retpoline" = 1 ]; then pvulnstatus $cve OK "Retpoline mitigates the vulnerability" elif [ "$ibrs_active" = 1 ]; then pvulnstatus $cve OK "IBRS mitigates the vulnerability" elif [ "$ibrs_disabled" = 0 ]; then pvulnstatus $cve VULN "IBRS is supported by your kernel but your CPU microcode lacks support" explain "The microcode of your CPU needs to be upgraded to be able to use IBRS. Availability of a microcode update for you CPU model depends on your CPU vendor. You can usually find out online if a microcode update is available for your CPU by searching for your CPUID (indicated in the Hardware Check section). To do a microcode update, you can search the ports for the \`cpupdate\` tool. Microcode updates done this way are not reboot-proof, so be sure to do it every time the system boots up." elif [ "$ibrs_disabled" = 1 ]; then pvulnstatus $cve VULN "IBRS is supported but administratively disabled on your system" explain "To enable IBRS, use \`sysctl hw.ibrs_disable=0\`" else pvulnstatus $cve VULN "IBRS is needed to mitigate the vulnerability but your kernel is missing support" explain "You need to either upgrade your kernel or recompile yourself a more recent version having IBRS support" fi } ################## # MELTDOWN SECTION # no security impact but give a hint to the user in verbose mode # about PCID/INVPCID cpuid features that must be present to avoid # too big a performance impact with PTI # refs: # https://marc.info/?t=151532047900001&r=1&w=2 # https://groups.google.com/forum/m/#!topic/mechanical-sympathy/L9mHTbeQLNU pti_performance_check() { _info_nol " * Reduced performance impact of PTI: " if [ -e "$procfs/cpuinfo" ] && grep ^flags "$procfs/cpuinfo" | grep -qw pcid; then cpu_pcid=1 else read_cpuid 0x1 $ECX 17 1 1; ret=$? [ $ret -eq 0 ] && cpu_pcid=1 fi if [ -e "$procfs/cpuinfo" ] && grep ^flags "$procfs/cpuinfo" | grep -qw invpcid; then cpu_invpcid=1 else read_cpuid 0x7 $EBX 10 1 1; ret=$? [ $ret -eq 0 ] && cpu_invpcid=1 fi if [ "$cpu_invpcid" = 1 ]; then pstatus green YES 'CPU supports INVPCID, performance impact of PTI will be greatly reduced' elif [ "$cpu_pcid" = 1 ]; then pstatus green YES 'CPU supports PCID, performance impact of PTI will be reduced' else pstatus blue NO 'PCID/INVPCID not supported, performance impact of PTI will be significant' fi } # rogue data cache load aka 'Meltdown' aka 'Variant 3' check_CVE_2017_5754() { cve='CVE-2017-5754' _info "\033[1;34m$cve aka '$(cve2name "$cve")'\033[0m" if [ "$os" = Linux ]; then check_CVE_2017_5754_linux elif echo "$os" | grep -q BSD; then check_CVE_2017_5754_bsd else _warn "Unsupported OS ($os)" fi } check_CVE_2017_5754_linux() { status=UNK sys_interface_available=0 msg='' if sys_interface_check "/sys/devices/system/cpu/vulnerabilities/meltdown"; then # this kernel has the /sys interface, trust it over everything sys_interface_available=1 fi if [ "$opt_sysfs_only" != 1 ]; then _info_nol "* Kernel supports Page Table Isolation (PTI): " kpti_support='' kpti_can_tell=0 if [ -n "$opt_config" ]; then kpti_can_tell=1 kpti_support=$(grep -w -e CONFIG_PAGE_TABLE_ISOLATION=y -e CONFIG_KAISER=y -e CONFIG_UNMAP_KERNEL_AT_EL0=y "$opt_config") if [ -n "$kpti_support" ]; then _debug "kpti_support: found option '$kpti_support' in $opt_config" fi fi if [ -z "$kpti_support" ] && [ -n "$opt_map" ]; then # it's not an elif: some backports don't have the PTI config but still include the patch # so we try to find an exported symbol that is part of the PTI patch in System.map # parse_kpti: arm kpti_can_tell=1 kpti_support=$(grep -w -e kpti_force_enabled -e parse_kpti "$opt_map") if [ -n "$kpti_support" ]; then _debug "kpti_support: found '$kpti_support' in $opt_map" fi fi if [ -z "$kpti_support" ] && [ -n "$kernel" ]; then # same as above but in case we don't have System.map and only kernel, look for the # nopti option that is part of the patch (kernel command line option) # 'kpti=': arm kpti_can_tell=1 if ! command -v "${opt_arch_prefix}strings" >/dev/null 2>&1; then pstatus yellow UNKNOWN "missing '${opt_arch_prefix}strings' tool, please install it, usually it's in the binutils package" else kpti_support=$("${opt_arch_prefix}strings" "$kernel" | grep -w -e nopti -e kpti=) if [ -n "$kpti_support" ]; then _debug "kpti_support: found '$kpti_support' in $kernel" fi fi fi if [ -n "$kpti_support" ]; then if [ "$opt_verbose" -ge 2 ]; then pstatus green YES "found '$kpti_support'" else pstatus green YES fi elif [ "$kpti_can_tell" = 1 ]; then pstatus yellow NO else pstatus yellow UNKNOWN "couldn't read your kernel configuration nor System.map file" fi mount_debugfs _info_nol " * PTI enabled and active: " if [ "$opt_live" = 1 ]; then dmesg_grep="Kernel/User page tables isolation: enabled" dmesg_grep="$dmesg_grep|Kernel page table isolation enabled" dmesg_grep="$dmesg_grep|x86/pti: Unmapping kernel while in userspace" # aarch64 dmesg_grep="$dmesg_grep|CPU features: detected( feature)?: Kernel page table isolation \(KPTI\)" if grep ^flags "$procfs/cpuinfo" | grep -qw pti; then # vanilla PTI patch sets the 'pti' flag in cpuinfo _debug "kpti_enabled: found 'pti' flag in $procfs/cpuinfo" kpti_enabled=1 elif grep ^flags "$procfs/cpuinfo" | grep -qw kaiser; then # kernel line 4.9 sets the 'kaiser' flag in cpuinfo _debug "kpti_enabled: found 'kaiser' flag in $procfs/cpuinfo" kpti_enabled=1 elif [ -e /sys/kernel/debug/x86/pti_enabled ]; then # Red Hat Backport creates a dedicated file, see https://access.redhat.com/articles/3311301 kpti_enabled=$(cat /sys/kernel/debug/x86/pti_enabled 2>/dev/null) _debug "kpti_enabled: file /sys/kernel/debug/x86/pti_enabled exists and says: $kpti_enabled" elif is_xen_dom0; then pti_xen_pv_domU=$(xl dmesg | grep 'XPTI' | grep 'DomU enabled' | head -1) [ -n "$pti_xen_pv_domU" ] && kpti_enabled=1 fi if [ -z "$kpti_enabled" ]; then dmesg_grep "$dmesg_grep"; ret=$? if [ $ret -eq 0 ]; then _debug "kpti_enabled: found hint in dmesg: $dmesg_grepped" kpti_enabled=1 elif [ $ret -eq 2 ]; then _debug "kpti_enabled: dmesg truncated" kpti_enabled=-1 fi fi if [ -z "$kpti_enabled" ]; then _debug "kpti_enabled: couldn't find any hint that PTI is enabled" kpti_enabled=0 fi if [ "$kpti_enabled" = 1 ]; then pstatus green YES elif [ "$kpti_enabled" = -1 ]; then pstatus yellow UNKNOWN "dmesg truncated, please reboot and relaunch this script" else pstatus yellow NO fi else pstatus blue N/A "not testable in offline mode" fi pti_performance_check elif [ "$sys_interface_available" = 0 ]; then # we have no sysfs but were asked to use it only! msg="/sys vulnerability interface use forced, but it's not available!" status=UNK fi # Test if the current host is a Xen PV Dom0 / DomU is_xen_dom0 && xen_pv_domo=1 is_xen_domU && xen_pv_domu=1 if [ "$opt_live" = 1 ]; then # checking whether we're running under Xen PV 64 bits. If yes, we are affected by variant3 # (unless we are a Dom0) _info_nol "* Running as a Xen PV DomU: " if [ "$xen_pv_domu" = 1 ]; then pstatus yellow YES else pstatus blue NO fi fi if ! is_cpu_vulnerable "$cve"; then # override status & msg in case CPU is not vulnerable after all pvulnstatus $cve OK "your CPU vendor reported your CPU model as not vulnerable" elif [ -z "$msg" ]; then # if msg is empty, sysfs check didn't fill it, rely on our own test if [ "$opt_live" = 1 ]; then if [ "$kpti_enabled" = 1 ]; then pvulnstatus $cve OK "PTI mitigates the vulnerability" elif [ "$xen_pv_domo" = 1 ]; then pvulnstatus $cve OK "Xen Dom0s are safe and do not require PTI" elif [ "$xen_pv_domu" = 1 ]; then pvulnstatus $cve VULN "Xen PV DomUs are vulnerable and need to be run in HVM, PVHVM, PVH mode, or the Xen hypervisor must have the Xen's own PTI patch" explain "Go to https://blog.xenproject.org/2018/01/22/xen-project-spectre-meltdown-faq-jan-22-update/ for more information" elif [ "$kpti_enabled" = -1 ]; then pvulnstatus $cve UNK "couldn't find any clue of PTI activation due to a truncated dmesg, please reboot and relaunch this script" else pvulnstatus $cve VULN "PTI is needed to mitigate the vulnerability" if [ -n "$kpti_support" ]; then if [ -e "/sys/kernel/debug/x86/pti_enabled" ]; then explain "Your kernel supports PTI but it's disabled, you can enable it with \`echo 1 > /sys/kernel/debug/x86/pti_enabled\`" elif echo "$kernel_cmdline" | grep -q -w -e nopti -e pti=off; then explain "Your kernel supports PTI but it has been disabled on command-line, remove the nopti or pti=off option from your bootloader configuration" else explain "Your kernel supports PTI but it has been disabled, check \`dmesg\` right after boot to find clues why the system disabled it" fi else explain "If you're using a distro kernel, upgrade your distro to get the latest kernel available. Otherwise, recompile the kernel with the CONFIG_PAGE_TABLE_ISOLATION option (named CONFIG_KAISER for some kernels), or the CONFIG_UNMAP_KERNEL_AT_EL0 option (for ARM64)" fi fi else if [ -n "$kpti_support" ]; then pvulnstatus $cve OK "offline mode: PTI will mitigate the vulnerability if enabled at runtime" elif [ "$kpti_can_tell" = 1 ]; then pvulnstatus $cve VULN "PTI is needed to mitigate the vulnerability" explain "If you're using a distro kernel, upgrade your distro to get the latest kernel available. Otherwise, recompile the kernel with the CONFIG_PAGE_TABLE_ISOLATION option (named CONFIG_KAISER for some kernels), or the CONFIG_UNMAP_KERNEL_AT_EL0 option (for ARM64)" else pvulnstatus $cve UNK "offline mode: not enough information" explain "Re-run this script with root privileges, and give it the kernel image (--kernel), the kernel configuration (--config) and the System.map file (--map) corresponding to the kernel you would like to inspect." fi fi else if [ "$xen_pv_domo" = 1 ]; then msg="Xen Dom0s are safe and do not require PTI" status="OK" elif [ "$xen_pv_domu" = 1 ]; then msg="Xen PV DomUs are vulnerable and need to be run in HVM, PVHVM, PVH mode, or the Xen hypervisor must have the Xen's own PTI patch" status="VULN" _explain="Go to https://blog.xenproject.org/2018/01/22/xen-project-spectre-meltdown-faq-jan-22-update/ for more information" elif [ "$msg" = "Vulnerable" ]; then msg="PTI is needed to mitigate the vulnerability" _explain="If you're using a distro kernel, upgrade your distro to get the latest kernel available. Otherwise, recompile the kernel with the CONFIG_PAGE_TABLE_ISOLATION option (named CONFIG_KAISER for some kernels), or the CONFIG_UNMAP_KERNEL_AT_EL0 option (for ARM64)" fi pvulnstatus $cve "$status" "$msg" [ -z "$_explain" ] && [ "$msg" = "Vulnerable" ] && _explain="If you're using a distro kernel, upgrade your distro to get the latest kernel available. Otherwise, recompile the kernel with the CONFIG_PAGE_TABLE_ISOLATION option (named CONFIG_KAISER for some kernels), or the CONFIG_UNMAP_KERNEL_AT_EL0 option (for ARM64)" [ -n "$_explain" ] && explain "$_explain" unset _explain fi # Warn the user about XSA-254 recommended mitigations if [ "$xen_pv_domo" = 1 ]; then _warn _warn "This host is a Xen Dom0. Please make sure that you are running your DomUs" _warn "in HVM, PVHVM or PVH mode to prevent any guest-to-host / host-to-guest attacks." _warn _warn "See https://blog.xenproject.org/2018/01/22/xen-project-spectre-meltdown-faq-jan-22-update/ and XSA-254 for details." fi } check_CVE_2017_5754_bsd() { _info_nol "* Kernel supports Page Table Isolation (PTI): " kpti_enabled=$(sysctl -n vm.pmap.pti 2>/dev/null) if [ -z "$kpti_enabled" ]; then pstatus yellow NO else pstatus green YES fi _info_nol " * PTI enabled and active: " if [ "$kpti_enabled" = 1 ]; then pstatus green YES else pstatus yellow NO fi pti_performance_check if ! is_cpu_vulnerable "$cve"; then # override status & msg in case CPU is not vulnerable after all pvulnstatus $cve OK "your CPU vendor reported your CPU model as not vulnerable" elif [ "$kpti_enabled" = 1 ]; then pvulnstatus $cve OK "PTI mitigates the vulnerability" elif [ -n "$kpti_enabled" ]; then pvulnstatus $cve VULN "PTI is supported but disabled on your system" else pvulnstatus $cve VULN "PTI is needed to mitigate the vulnerability" fi } #################### # VARIANT 3A SECTION # rogue system register read aka 'Variant 3a' check_CVE_2018_3640() { cve='CVE-2018-3640' _info "\033[1;34m$cve aka '$(cve2name "$cve")'\033[0m" status=UNK sys_interface_available=0 msg='' _info_nol "* CPU microcode mitigates the vulnerability: " if [ -n "$cpuid_ssbd" ]; then # microcodes that ship with SSBD are known to also fix variant3a # there is no specific cpuid bit as far as we know pstatus green YES else pstatus yellow NO fi if ! is_cpu_vulnerable "$cve"; then # override status & msg in case CPU is not vulnerable after all pvulnstatus $cve OK "your CPU vendor reported your CPU model as not vulnerable" elif [ -n "$cpuid_ssbd" ]; then pvulnstatus $cve OK "your CPU microcode mitigates the vulnerability" else pvulnstatus $cve VULN "an up-to-date CPU microcode is needed to mitigate this vulnerability" explain "The microcode of your CPU needs to be upgraded to mitigate this vulnerability. This is usually done at boot time by your kernel (the upgrade is not persistent across reboots which is why it's done at each boot). If you're using a distro, make sure you are up to date, as microcode updates are usually shipped alongside with the distro kernel. Availability of a microcode update for you CPU model depends on your CPU vendor. You can usually find out online if a microcode update is available for your CPU by searching for your CPUID (indicated in the Hardware Check section). The microcode update is enough, there is no additional OS, kernel or software change needed." fi } ################### # VARIANT 4 SECTION # speculative store bypass aka 'Variant 4' check_CVE_2018_3639() { cve='CVE-2018-3639' _info "\033[1;34m$cve aka '$(cve2name "$cve")'\033[0m" if [ "$os" = Linux ]; then check_CVE_2018_3639_linux elif echo "$os" | grep -q BSD; then check_CVE_2018_3639_bsd else _warn "Unsupported OS ($os)" fi } check_CVE_2018_3639_linux() { status=UNK sys_interface_available=0 msg='' if sys_interface_check "/sys/devices/system/cpu/vulnerabilities/spec_store_bypass"; then # this kernel has the /sys interface, trust it over everything sys_interface_available=1 fi if [ "$opt_sysfs_only" != 1 ]; then _info_nol "* Kernel supports disabling speculative store bypass (SSB): " if [ "$opt_live" = 1 ]; then if grep -Eq 'Speculation.?Store.?Bypass:' "$procfs/self/status" 2>/dev/null; then kernel_ssb="found in $procfs/self/status" _debug "found Speculation.Store.Bypass: in $procfs/self/status" fi fi # arm64 kernels can have cpu_show_spec_store_bypass with ARM64_SSBD, so exclude them if [ -z "$kernel_ssb" ] && [ -n "$kernel" ] && ! grep -q 'arm64_sys_' "$kernel"; then kernel_ssb=$("${opt_arch_prefix}strings" "$kernel" | grep spec_store_bypass | head -n1); [ -n "$kernel_ssb" ] && kernel_ssb="found $kernel_ssb in kernel" fi # arm64 kernels can have cpu_show_spec_store_bypass with ARM64_SSBD, so exclude them if [ -z "$kernel_ssb" ] && [ -n "$opt_map" ] && ! grep -q 'arm64_sys_' "$opt_map"; then kernel_ssb=$(grep spec_store_bypass "$opt_map" | awk '{print $3}' | head -n1) [ -n "$kernel_ssb" ] && kernel_ssb="found $kernel_ssb in System.map" fi # arm64 only: if [ -z "$kernel_ssb" ] && [ -n "$opt_map" ]; then kernel_ssb=$(grep -w cpu_enable_ssbs "$opt_map" | awk '{print $3}' | head -n1) [ -n "$kernel_ssb" ] && kernel_ssb="found $kernel_ssb in System.map" fi if [ -z "$kernel_ssb" ] && [ -n "$opt_config" ]; then kernel_ssb=$(grep -w 'CONFIG_ARM64_SSBD=y' "$opt_config") [ -n "$kernel_ssb" ] && kernel_ssb="CONFIG_ARM64_SSBD enabled in kconfig" fi if [ -z "$kernel_ssb" ] && [ -n "$kernel" ]; then # this string only appears in kernel if CONFIG_ARM64_SSBD is set kernel_ssb=$(grep -w "Speculative Store Bypassing Safe (SSBS)" "$kernel") [ -n "$kernel_ssb" ] && kernel_ssb="found 'Speculative Store Bypassing Safe (SSBS)' in kernel" fi # /arm64 only if [ -n "$kernel_ssb" ]; then pstatus green YES "$kernel_ssb" else pstatus yellow NO fi kernel_ssbd_enabled=-1 if [ "$opt_live" = 1 ]; then # https://elixir.bootlin.com/linux/v5.0/source/fs/proc/array.c#L340 _info_nol "* SSB mitigation is enabled and active: " if grep -Eq 'Speculation.?Store.?Bypass:[[:space:]]+thread' "$procfs/self/status" 2>/dev/null; then kernel_ssbd_enabled=1 pstatus green YES "per-thread through prctl" elif grep -Eq 'Speculation.?Store.?Bypass:[[:space:]]+globally mitigated' "$procfs/self/status" 2>/dev/null; then kernel_ssbd_enabled=2 pstatus green YES "global" elif grep -Eq 'Speculation.?Store.?Bypass:[[:space:]]+vulnerable' "$procfs/self/status" 2>/dev/null; then kernel_ssbd_enabled=0 pstatus yellow NO elif grep -Eq 'Speculation.?Store.?Bypass:[[:space:]]+not vulnerable' "$procfs/self/status" 2>/dev/null; then kernel_ssbd_enabled=-2 pstatus blue NO "not vulnerable" elif grep -Eq 'Speculation.?Store.?Bypass:[[:space:]]+unknown' "$procfs/self/status" 2>/dev/null; then kernel_ssbd_enabled=0 pstatus blue NO else pstatus blue UNKNOWN "unknown value: $(grep -E 'Speculation.?Store.?Bypass:' "$procfs/self/status" 2>/dev/null | cut -d: -f2-)" fi if [ "$kernel_ssbd_enabled" = 1 ]; then _info_nol "* SSB mitigation currently active for selected processes: " # silence grep's stderr here to avoid ENOENT errors from processes that have exited since the shell's expansion of the * mitigated_processes=$(find /proc -mindepth 2 -maxdepth 2 -type f -name status -print0 2>/dev/null \ | xargs -r0 grep -El 'Speculation.?Store.?Bypass:[[:space:]]+thread (force )?mitigated' 2>/dev/null \ | sed s/status/exe/ | xargs -r -n1 readlink -f 2>/dev/null | xargs -r -n1 basename | sort -u | tr "\n" " " | sed 's/ $//') if [ -n "$mitigated_processes" ]; then pstatus green YES "$mitigated_processes" else pstatus yellow NO "no process found using SSB mitigation through prctl" fi fi fi elif [ "$sys_interface_available" = 0 ]; then # we have no sysfs but were asked to use it only! msg="/sys vulnerability interface use forced, but it's not available!" status=UNK fi if ! is_cpu_vulnerable "$cve"; then # override status & msg in case CPU is not vulnerable after all pvulnstatus $cve OK "your CPU vendor reported your CPU model as not vulnerable" elif [ -z "$msg" ] || [ "$msg" = "Vulnerable" ]; then # if msg is empty, sysfs check didn't fill it, rely on our own test if [ -n "$cpuid_ssbd" ]; then if [ -n "$kernel_ssb" ]; then if [ "$opt_live" = 1 ]; then if [ "$kernel_ssbd_enabled" -gt 0 ]; then pvulnstatus $cve OK "your CPU and kernel both support SSBD and mitigation is enabled" else pvulnstatus $cve VULN "your CPU and kernel both support SSBD but the mitigation is not active" fi else pvulnstatus $cve OK "your system provides the necessary tools for software mitigation" fi else pvulnstatus $cve VULN "your kernel needs to be updated" explain "You have a recent-enough CPU microcode but your kernel is too old to use the new features exported by your CPU's microcode. If you're using a distro kernel, upgrade your distro to get the latest kernel available. Otherwise, recompile the kernel from recent-enough sources." fi else if [ -n "$kernel_ssb" ]; then pvulnstatus $cve VULN "Your CPU doesn't support SSBD" explain "Your kernel is recent enough to use the CPU microcode features for mitigation, but your CPU microcode doesn't actually provide the necessary features for the kernel to use. The microcode of your CPU hence needs to be upgraded. This is usually done at boot time by your kernel (the upgrade is not persistent across reboots which is why it's done at each boot). If you're using a distro, make sure you are up to date, as microcode updates are usually shipped alongside with the distro kernel. Availability of a microcode update for you CPU model depends on your CPU vendor. You can usually find out online if a microcode update is available for your CPU by searching for your CPUID (indicated in the Hardware Check section)." else pvulnstatus $cve VULN "Neither your CPU nor your kernel support SSBD" explain "Both your CPU microcode and your kernel are lacking support for mitigation. If you're using a distro kernel, upgrade your distro to get the latest kernel available. Otherwise, recompile the kernel from recent-enough sources. The microcode of your CPU also needs to be upgraded. This is usually done at boot time by your kernel (the upgrade is not persistent across reboots which is why it's done at each boot). If you're using a distro, make sure you are up to date, as microcode updates are usually shipped alongside with the distro kernel. Availability of a microcode update for you CPU model depends on your CPU vendor. You can usually find out online if a microcode update is available for your CPU by searching for your CPUID (indicated in the Hardware Check section)." fi fi else pvulnstatus $cve "$status" "$msg" fi } check_CVE_2018_3639_bsd() { _info_nol "* Kernel supports speculation store bypass: " if sysctl hw.spec_store_bypass_disable >/dev/null 2>&1; then kernel_ssb=1 pstatus green YES else kernel_ssb=0 pstatus yellow NO fi _info_nol "* Speculation store bypass is administratively enabled: " ssb_enabled=$(sysctl -n hw.spec_store_bypass_disable 2>/dev/null) _debug "hw.spec_store_bypass_disable=$ssb_enabled" case "$ssb_enabled" in 0) pstatus yellow NO "disabled";; 1) pstatus green YES "enabled";; 2) pstatus green YES "auto mode";; *) pstatus yellow NO "unavailable";; esac _info_nol "* Speculation store bypass is currently active: " ssb_active=$(sysctl -n hw.spec_store_bypass_disable_active 2>/dev/null) _debug "hw.spec_store_bypass_disable_active=$ssb_active" case "$ssb_active" in 1) pstatus green YES;; *) pstatus yellow NO;; esac if ! is_cpu_vulnerable "$cve"; then pvulnstatus $cve OK "your CPU vendor reported your CPU model as not vulnerable" else if [ "$ssb_active" = 1 ]; then pvulnstatus $cve OK "SSBD mitigates the vulnerability" elif [ -n "$cpuid_ssbd" ]; then if [ "$kernel_ssb" = 1 ]; then pvulnstatus $cve VULN "you need to enable SSBD through sysctl to mitigate the vulnerability" explain "To enable SSBD right now, you can run \`sysctl hw.spec_store_bypass_disable=2'. To make this change persistent across reboots, you can add 'sysctl hw.spec_store_bypass_disable=2' to /etc/sysctl.conf." else pvulnstatus $cve VULN "your kernel needs to be updated" fi else if [ "$kernel_ssb" = 1 ]; then pvulnstatus $cve VULN "Your CPU doesn't support SSBD" else pvulnstatus $cve VULN "Neither your CPU nor your kernel support SSBD" fi fi fi } ########################### # L1TF / FORESHADOW SECTION # L1 terminal fault (SGX) aka 'Foreshadow' check_CVE_2018_3615() { cve='CVE-2018-3615' _info "\033[1;34m$cve aka '$(cve2name "$cve")'\033[0m" _info_nol "* CPU microcode mitigates the vulnerability: " if { [ "$cpu_flush_cmd" = 1 ] || { [ "$msr_locked_down" = 1 ] && [ "$cpuid_l1df" = 1 ]; }; } && [ "$cpuid_sgx" = 1 ]; then # no easy way to detect a fixed SGX but we know that # microcodes that have the FLUSH_CMD MSR also have the # fixed SGX (for CPUs that support it), because Intel # delivered fixed microcodes for both issues at the same time # # if the system we're running on is locked down (no way to write MSRs), # make the assumption that if the L1D flush CPUID bit is set, probably # that FLUSH_CMD MSR is here too pstatus green YES elif [ "$cpuid_sgx" = 1 ]; then pstatus red NO else pstatus blue N/A fi if ! is_cpu_vulnerable "$cve"; then # override status & msg in case CPU is not vulnerable after all pvulnstatus $cve OK "your CPU vendor reported your CPU model as not vulnerable" elif [ "$cpu_flush_cmd" = 1 ] || { [ "$msr_locked_down" = 1 ] && [ "$cpuid_l1df" = 1 ]; } ; then pvulnstatus $cve OK "your CPU microcode mitigates the vulnerability" else pvulnstatus $cve VULN "your CPU supports SGX and the microcode is not up to date" fi } # L1 terminal fault (OS) aka 'Foreshadow-NG (OS)' check_CVE_2018_3620() { cve='CVE-2018-3620' _info "\033[1;34m$cve aka '$(cve2name "$cve")'\033[0m" if [ "$os" = Linux ]; then check_CVE_2018_3620_linux elif echo "$os" | grep -q BSD; then check_CVE_2018_3620_bsd else _warn "Unsupported OS ($os)" fi } check_CVE_2018_3620_linux() { status=UNK sys_interface_available=0 msg='' if sys_interface_check "/sys/devices/system/cpu/vulnerabilities/l1tf"; then # this kernel has the /sys interface, trust it over everything sys_interface_available=1 fi if [ "$opt_sysfs_only" != 1 ]; then _info_nol "* Kernel supports PTE inversion: " if ! command -v "${opt_arch_prefix}strings" >/dev/null 2>&1; then pstatus yellow UNKNOWN "missing 'strings' tool, please install it" pteinv_supported=-1 elif [ -n "$kernel_err" ]; then pstatus yellow UNKNOWN "$kernel_err" pteinv_supported=-1 else if "${opt_arch_prefix}strings" "$kernel" | grep -Fq 'PTE Inversion'; then pstatus green YES "found in kernel image" _debug "pteinv: found pte inversion evidence in kernel image" pteinv_supported=1 else pstatus yellow NO pteinv_supported=0 fi fi _info_nol "* PTE inversion enabled and active: " if [ "$opt_live" = 1 ]; then if [ -n "$fullmsg" ]; then if echo "$fullmsg" | grep -q 'Mitigation: PTE Inversion'; then pstatus green YES pteinv_active=1 else pstatus yellow NO pteinv_active=0 fi else pstatus yellow UNKNOWN "sysfs interface not available" pteinv_active=-1 fi else pstatus blue N/A "not testable in offline mode" fi elif [ "$sys_interface_available" = 0 ]; then # we have no sysfs but were asked to use it only! msg="/sys vulnerability interface use forced, but it's not available!" status=UNK fi if ! is_cpu_vulnerable "$cve"; then # override status & msg in case CPU is not vulnerable after all pvulnstatus $cve OK "your CPU vendor reported your CPU model as not vulnerable" elif [ -z "$msg" ]; then # if msg is empty, sysfs check didn't fill it, rely on our own test if [ "$pteinv_supported" = 1 ]; then if [ "$pteinv_active" = 1 ] || [ "$opt_live" != 1 ]; then pvulnstatus $cve OK "PTE inversion mitigates the vulnerability" else pvulnstatus $cve VULN "Your kernel supports PTE inversion but it doesn't seem to be enabled" fi else pvulnstatus $cve VULN "Your kernel doesn't support PTE inversion, update it" fi else pvulnstatus $cve "$status" "$msg" fi } check_CVE_2018_3620_bsd() { _info_nol "* Kernel reserved the memory page at physical address 0x0: " if ! kldstat -q -m vmm; then kldload vmm 2>/dev/null && kldload_vmm=1 _debug "attempted to load module vmm, kldload_vmm=$kldload_vmm" else _debug "vmm module already loaded" fi if sysctl hw.vmm.vmx.l1d_flush >/dev/null 2>&1; then # https://security.FreeBSD.org/patches/SA-18:09/l1tf-11.2.patch # this is very difficult to detect that the kernel reserved the 0 page, but this fix # is part of the exact same patch than the other L1TF CVE, so we detect it # and deem it as OK if the other patch is there pstatus green YES bsd_zero_reserved=1 else pstatus yellow NO bsd_zero_reserved=0 fi if ! is_cpu_vulnerable "$cve"; then pvulnstatus $cve OK "your CPU vendor reported your CPU model as not vulnerable" else if [ "$bsd_zero_reserved" = 1 ]; then pvulnstatus $cve OK "kernel mitigates the vulnerability" else pvulnstatus $cve VULN "your kernel needs to be updated" fi fi } # L1TF VMM check_CVE_2018_3646() { cve='CVE-2018-3646' _info "\033[1;34m$cve aka '$(cve2name "$cve")'\033[0m" if [ "$os" = Linux ]; then check_CVE_2018_3646_linux elif echo "$os" | grep -q BSD; then check_CVE_2018_3646_bsd else _warn "Unsupported OS ($os)" fi } check_CVE_2018_3646_linux() { status=UNK sys_interface_available=0 msg='' if sys_interface_check "/sys/devices/system/cpu/vulnerabilities/l1tf" '.*' quiet; then # this kernel has the /sys interface, trust it over everything sys_interface_available=1 fi l1d_mode=-1 if [ "$opt_sysfs_only" != 1 ]; then check_has_vmm _info "* Mitigation 1 (KVM)" _info_nol " * EPT is disabled: " if [ "$opt_live" = 1 ]; then if ! [ -r /sys/module/kvm_intel/parameters/ept ]; then pstatus blue N/A "the kvm_intel module is not loaded" elif [ "$(cat /sys/module/kvm_intel/parameters/ept)" = N ]; then pstatus green YES ept_disabled=1 else pstatus yellow NO fi else pstatus blue N/A "not testable in offline mode" fi _info "* Mitigation 2" _info_nol " * L1D flush is supported by kernel: " if [ "$opt_live" = 1 ] && grep -qw flush_l1d "$procfs/cpuinfo"; then l1d_kernel="found flush_l1d in $procfs/cpuinfo" fi if [ -z "$l1d_kernel" ]; then if ! command -v "${opt_arch_prefix}strings" >/dev/null 2>&1; then l1d_kernel_err="missing '${opt_arch_prefix}strings' tool, please install it, usually it's in the binutils package" elif [ -n "$kernel_err" ]; then l1d_kernel_err="$kernel_err" elif "${opt_arch_prefix}strings" "$kernel" | grep -qw flush_l1d; then l1d_kernel='found flush_l1d in kernel image' fi fi if [ -n "$l1d_kernel" ]; then pstatus green YES "$l1d_kernel" elif [ -n "$l1d_kernel_err" ]; then pstatus yellow UNKNOWN "$l1d_kernel_err" else pstatus yellow NO fi _info_nol " * L1D flush enabled: " if [ "$opt_live" = 1 ]; then if [ -n "$fullmsg" ]; then # vanilla: VMX: $l1dstatus, SMT $smtstatus # Red Hat: VMX: SMT $smtstatus, L1D $l1dstatus # $l1dstatus is one of (auto|vulnerable|conditional cache flushes|cache flushes|EPT disabled|flush not necessary) # $smtstatus is one of (vulnerable|disabled) # can also just be "Not affected" if echo "$fullmsg" | grep -Eq -e 'Not affected' -e '(VMX:|L1D) (EPT disabled|vulnerable|flush not necessary)'; then l1d_mode=0 pstatus yellow NO elif echo "$fullmsg" | grep -Eq '(VMX:|L1D) conditional cache flushes'; then l1d_mode=1 pstatus green YES "conditional flushes" elif echo "$fullmsg" | grep -Eq '(VMX:|L1D) cache flushes'; then l1d_mode=2 pstatus green YES "unconditional flushes" else if is_xen_dom0; then l1d_xen_hardware=$(xl dmesg | grep 'Hardware features:' | grep 'L1D_FLUSH' | head -1) l1d_xen_hypervisor=$(xl dmesg | grep 'Xen settings:' | grep 'L1D_FLUSH' | head -1) l1d_xen_pv_domU=$(xl dmesg | grep 'PV L1TF shadowing:' | grep 'DomU enabled' | head -1) if [ -n "$l1d_xen_hardware" ] && [ -n "$l1d_xen_hypervisor" ] && [ -n "$l1d_xen_pv_domU" ]; then l1d_mode=5 pstatus green YES "for XEN guests" elif [ -n "$l1d_xen_hardware" ] && [ -n "$l1d_xen_hypervisor" ]; then l1d_mode=4 pstatus yellow YES "for XEN guests (HVM only)" elif [ -n "$l1d_xen_pv_domU" ]; then l1d_mode=3 pstatus yellow YES "for XEN guests (PV only)" else l1d_mode=0 pstatus yellow NO "for XEN guests" fi else l1d_mode=-1 pstatus yellow UNKNOWN "unrecognized mode" fi fi else l1d_mode=-1 pstatus yellow UNKNOWN "can't find or read /sys/devices/system/cpu/vulnerabilities/l1tf" fi else l1d_mode=-1 pstatus blue N/A "not testable in offline mode" fi _info_nol " * Hardware-backed L1D flush supported: " if [ "$opt_live" = 1 ]; then if grep -qw flush_l1d "$procfs/cpuinfo" || [ -n "$l1d_xen_hardware" ]; then pstatus green YES "performance impact of the mitigation will be greatly reduced" else pstatus blue NO "flush will be done in software, this is slower" fi else pstatus blue N/A "not testable in offline mode" fi _info_nol " * Hyper-Threading (SMT) is enabled: " is_cpu_smt_enabled; smt_enabled=$? if [ "$smt_enabled" = 0 ]; then pstatus yellow YES elif [ "$smt_enabled" = 1 ]; then pstatus green NO else pstatus yellow UNKNOWN fi elif [ "$sys_interface_available" = 0 ]; then # we have no sysfs but were asked to use it only! msg="/sys vulnerability interface use forced, but it's not available!" status=UNK l1d_mode=-1 fi if ! is_cpu_vulnerable "$cve"; then # override status & msg in case CPU is not vulnerable after all pvulnstatus $cve OK "your CPU vendor reported your CPU model as not vulnerable" elif [ "$fullmsg" = "Not affected" ]; then # just in case a very recent kernel knows better than we do pvulnstatus $cve OK "your kernel reported your CPU model as not vulnerable" elif [ "$has_vmm" = 0 ]; then pvulnstatus $cve OK "this system is not running a hypervisor" else if [ "$ept_disabled" = 1 ]; then pvulnstatus $cve OK "EPT is disabled which mitigates the vulnerability" elif [ "$opt_paranoid" = 0 ]; then if [ "$l1d_mode" -ge 1 ]; then pvulnstatus $cve OK "L1D flushing is enabled and mitigates the vulnerability" else pvulnstatus $cve VULN "disable EPT or enable L1D flushing to mitigate the vulnerability" fi else if [ "$l1d_mode" -ge 2 ]; then if [ "$smt_enabled" = 1 ]; then pvulnstatus $cve OK "L1D unconditional flushing and Hyper-Threading disabled are mitigating the vulnerability" else pvulnstatus $cve VULN "Hyper-Threading must be disabled to fully mitigate the vulnerability" fi else if [ "$smt_enabled" = 1 ]; then pvulnstatus $cve VULN "L1D unconditional flushing should be enabled to fully mitigate the vulnerability" else pvulnstatus $cve VULN "enable L1D unconditional flushing and disable Hyper-Threading to fully mitigate the vulnerability" fi fi fi if [ $l1d_mode -gt 3 ]; then _warn _warn "This host is a Xen Dom0. Please make sure that you are running your DomUs" _warn "with a kernel which contains CVE-2018-3646 mitigations." _warn _warn "See https://www.suse.com/support/kb/doc/?id=7023078 and XSA-273 for details." fi fi } check_CVE_2018_3646_bsd() { _info_nol "* Kernel supports L1D flushing: " if sysctl hw.vmm.vmx.l1d_flush >/dev/null 2>&1; then pstatus green YES kernel_l1d_supported=1 else pstatus yellow NO kernel_l1d_supported=0 fi _info_nol "* L1D flushing is enabled: " kernel_l1d_enabled=$(sysctl -n hw.vmm.vmx.l1d_flush 2>/dev/null) case "$kernel_l1d_enabled" in 0) pstatus yellow NO;; 1) pstatus green YES;; "") pstatus yellow NO;; *) pstatus yellow UNKNOWN;; esac if ! is_cpu_vulnerable "$cve"; then pvulnstatus $cve OK "your CPU vendor reported your CPU model as not vulnerable" else if [ "$kernel_l1d_enabled" = 1 ]; then pvulnstatus $cve OK "L1D flushing mitigates the vulnerability" elif [ "$kernel_l1d_supported" = 1 ]; then pvulnstatus $cve VULN "L1D flushing is supported by your kernel but is disabled" else pvulnstatus $cve VULN "your kernel needs to be updated" fi fi } ################### # MSBDS SECTION # Microarchitectural Store Buffer Data Sampling check_CVE_2018_12126() { cve='CVE-2018-12126' check_mds $cve } ################### # MFBDS SECTION # Microarchitectural Fill Buffer Data Sampling check_CVE_2018_12130() { cve='CVE-2018-12130' check_mds $cve } ################### # MLPDS SECTION # Microarchitectural Load Port Data Sampling check_CVE_2018_12127() { cve='CVE-2018-12127' check_mds $cve } ################### # MDSUM SECTION # Microarchitectural Data Sampling Uncacheable Memory check_CVE_2019_11091() { cve='CVE-2019-11091' check_mds $cve } # Microarchitectural Data Sampling check_mds() { cve=$1 _info "\033[1;34m$cve aka '$(cve2name "$cve")'\033[0m" if [ "$os" = Linux ]; then check_mds_linux "$cve" elif echo "$os" | grep -q BSD; then check_mds_bsd "$cve" else _warn "Unsupported OS ($os)" fi } check_mds_bsd() { _info_nol "* Kernel supports using MD_CLEAR mitigation: " if [ "$opt_live" = 1 ]; then if sysctl hw.mds_disable >/dev/null 2>&1; then pstatus green YES kernel_md_clear=1 else pstatus yellow NO kernel_md_clear=0 fi else if grep -Fq hw.mds_disable $opt_kernel; then pstatus green YES kernel_md_clear=1 else kernel_md_clear=0 pstatus yellow NO fi fi _info_nol "* CPU Hyper-Threading (SMT) is disabled: " if sysctl machdep.hyperthreading_allowed >/dev/null 2>&1; then kernel_smt_allowed=$(sysctl -n machdep.hyperthreading_allowed 2>/dev/null) if [ "$kernel_smt_allowed" = 1 ]; then pstatus yellow NO else pstatus green YES fi else pstatus yellow UNKNOWN "sysctl machdep.hyperthreading_allowed doesn't exist" fi _info_nol "* Kernel mitigation is enabled: " if [ "$kernel_md_clear" = 1 ]; then kernel_mds_enabled=$(sysctl -n hw.mds_disable 2>/dev/null) else kernel_mds_enabled=0 fi case "$kernel_mds_enabled" in 0) pstatus yellow NO;; 1) pstatus green YES "with microcode support";; 2) pstatus green YES "software-only support (SLOW)";; 3) pstatus green YES;; *) pstatus yellow UNKNOWN "unknown value $kernel_mds_enabled" esac _info_nol "* Kernel mitigation is active: " if [ "$kernel_md_clear" = 1 ]; then kernel_mds_state=$(sysctl -n hw.mds_disable_state 2>/dev/null) else kernel_mds_state=inactive fi # https://github.com/freebsd/freebsd/blob/master/sys/x86/x86/cpu_machdep.c#L953 case "$kernel_mds_state" in inactive) pstatus yellow NO;; VERW) pstatus green YES "with microcode support";; software*) pstatus green YES "software-only support (SLOW)";; *) pstatus yellow UNKNOWN esac if ! is_cpu_vulnerable "$cve"; then pvulnstatus "$cve" OK "your CPU vendor reported your CPU model as not vulnerable" else if [ "$cpuid_md_clear" = 1 ]; then if [ "$kernel_md_clear" = 1 ]; then if [ "$opt_live" = 1 ]; then # mitigation must also be enabled if [ "$kernel_mds_enabled" -ge 1 ]; then if [ "$opt_paranoid" != 1 ] || [ "$kernel_smt_allowed" = 0 ]; then pvulnstatus "$cve" OK "Your microcode and kernel are both up to date for this mitigation, and mitigation is enabled" else pvulnstatus "$cve" VULN "Your microcode and kernel are both up to date for this mitigation, but you must disable SMT (Hyper-Threading) for a complete mitigation" fi else pvulnstatus "$cve" VULN "Your microcode and kernel are both up to date for this mitigation, but the mitigation is not active" explain "To enable mitigation, run \`sysctl hw.mds_disable=1'. To make this change persistent across reboots, you can add 'hw.mds_disable=1' to /etc/sysctl.conf." fi else pvulnstatus "$cve" OK "Your microcode and kernel are both up to date for this mitigation" fi else pvulnstatus "$cve" VULN "Your microcode supports mitigation, but your kernel doesn't, upgrade it to mitigate the vulnerability" fi else if [ "$kernel_md_clear" = 1 ]; then pvulnstatus "$cve" VULN "Your kernel supports mitigation, but your CPU microcode also needs to be updated to mitigate the vulnerability" else pvulnstatus "$cve" VULN "Neither your kernel or your microcode support mitigation, upgrade both to mitigate the vulnerability" fi fi fi } check_mds_linux() { status=UNK sys_interface_available=0 msg='' if sys_interface_check "/sys/devices/system/cpu/vulnerabilities/mds" '^[^;]+'; then sys_interface_available=1 fi if [ "$opt_sysfs_only" != 1 ]; then _info_nol "* Kernel supports using MD_CLEAR mitigation: " kernel_md_clear='' kernel_md_clear_can_tell=1 if [ "$opt_live" = 1 ] && grep ^flags $procfs/cpuinfo | grep -qw md_clear; then kernel_md_clear="md_clear found in $procfs/cpuinfo" pstatus green YES "$kernel_md_clear" fi if [ -z "$kernel_md_clear" ]; then if ! command -v "${opt_arch_prefix}strings" >/dev/null 2>&1; then kernel_md_clear_can_tell=0 elif [ -n "$kernel_err" ]; then kernel_md_clear_can_tell=0 elif "${opt_arch_prefix}strings" "$kernel" | grep -q 'Clear CPU buffers'; then _debug "md_clear: found 'Clear CPU buffers' string in kernel image" kernel_md_clear='found md_clear implementation evidence in kernel image' pstatus green YES "$kernel_md_clear" fi fi if [ -z "$kernel_md_clear" ]; then if [ "$kernel_md_clear_can_tell" = 1 ]; then pstatus yellow NO else pstatus yellow UNKNOWN fi fi if [ "$opt_live" = 1 ] && [ "$sys_interface_available" = 1 ]; then _info_nol "* Kernel mitigation is enabled and active: " if echo "$fullmsg" | grep -qi ^mitigation; then mds_mitigated=1 pstatus green YES else mds_mitigated=0 pstatus yellow NO fi _info_nol "* SMT is either mitigated or disabled: " if echo "$fullmsg" | grep -Eq 'SMT (disabled|mitigated)'; then mds_smt_mitigated=1 pstatus green YES else mds_smt_mitigated=0 pstatus yellow NO fi fi elif [ "$sys_interface_available" = 0 ]; then # we have no sysfs but were asked to use it only! msg="/sys vulnerability interface use forced, but it's not available!" status=UNK fi if ! is_cpu_vulnerable "$cve"; then # override status & msg in case CPU is not vulnerable after all pvulnstatus "$cve" OK "your CPU vendor reported your CPU model as not vulnerable" else if [ "$opt_sysfs_only" != 1 ]; then # compute mystatus and mymsg from our own logic if [ "$cpuid_md_clear" = 1 ]; then if [ -n "$kernel_md_clear" ]; then if [ "$opt_live" = 1 ]; then # mitigation must also be enabled if [ "$mds_mitigated" = 1 ]; then if [ "$opt_paranoid" != 1 ] || [ "$mds_smt_mitigated" = 1 ]; then mystatus=OK mymsg="Your microcode and kernel are both up to date for this mitigation, and mitigation is enabled" else mystatus=VULN mymsg="Your microcode and kernel are both up to date for this mitigation, but you must disable SMT (Hyper-Threading) for a complete mitigation" fi else mystatus=VULN mymsg="Your microcode and kernel are both up to date for this mitigation, but the mitigation is not active" fi else mystatus=OK mymsg="Your microcode and kernel are both up to date for this mitigation" fi else mystatus=VULN mymsg="Your microcode supports mitigation, but your kernel doesn't, upgrade it to mitigate the vulnerability" fi else if [ -n "$kernel_md_clear" ]; then mystatus=VULN mymsg="Your kernel supports mitigation, but your CPU microcode also needs to be updated to mitigate the vulnerability" else mystatus=VULN mymsg="Neither your kernel or your microcode support mitigation, upgrade both to mitigate the vulnerability" fi fi else # sysfs only: return the status/msg we got pvulnstatus "$cve" "$status" "$fullmsg" return fi # if we didn't get a msg+status from sysfs, use ours if [ -z "$msg" ]; then pvulnstatus "$cve" "$mystatus" "$mymsg" elif [ "$opt_paranoid" = 1 ]; then # if paranoid mode is enabled, we now that we won't agree on status, so take ours pvulnstatus "$cve" "$mystatus" "$mymsg" elif [ "$status" = "$mystatus" ]; then # if we agree on status, we'll print the common status and our message (more detailed than the sysfs one) pvulnstatus "$cve" "$status" "$mymsg" else # if we don't agree on status, maybe our logic is flawed due to a new kernel/mitigation? use the one from sysfs pvulnstatus "$cve" "$status" "$msg" fi fi } ################### # TAA SECTION # Transactional Synchronization Extension (TSX) Asynchronous Abort check_CVE_2019_11135() { cve='CVE-2019-11135' _info "\033[1;34m$cve aka '$(cve2name "$cve")'\033[0m" if [ "$os" = Linux ]; then check_CVE_2019_11135_linux #elif echo "$os" | grep -q BSD; then # check_CVE_2019_11135_bsd else _warn "Unsupported OS ($os)" fi } check_CVE_2019_11135_linux() { status=UNK sys_interface_available=0 msg='' if sys_interface_check "/sys/devices/system/cpu/vulnerabilities/tsx_async_abort"; then # this kernel has the /sys interface, trust it over everything sys_interface_available=1 fi if [ "$opt_sysfs_only" != 1 ]; then _info_nol "* TAA mitigation is supported by kernel: " kernel_taa='' if [ -n "$kernel_err" ]; then kernel_taa_err="$kernel_err" elif grep -q 'tsx_async_abort' "$kernel"; then kernel_taa="found tsx_async_abort in kernel image" fi if [ -n "$kernel_taa" ]; then pstatus green YES "$kernel_taa" elif [ -n "$kernel_taa_err" ]; then pstatus yellow UNKNOWN "$kernel_taa_err" else pstatus yellow NO fi _info_nol "* TAA mitigation enabled and active: " if [ "$opt_live" = 1 ]; then if [ -n "$fullmsg" ]; then if echo "$fullmsg" | grep -qE '^Mitigation'; then pstatus green YES "$fullmsg" else pstatus yellow NO fi else pstatus yellow NO "tsx_async_abort not found in sysfs hierarchy" fi else pstatus blue N/A "not testable in offline mode" fi elif [ "$sys_interface_available" = 0 ]; then # we have no sysfs but were asked to use it only! msg="/sys vulnerability interface use forced, but it's not available!" status=UNK fi if ! is_cpu_vulnerable "$cve" ; then # override status & msg in case CPU is not vulnerable after all pvulnstatus "$cve" OK "your CPU vendor reported your CPU model as not vulnerable" elif [ -z "$msg" ]; then # if msg is empty, sysfs check didn't fill it, rely on our own test if [ "$opt_live" = 1 ]; then # if we're in live mode and $msg is empty, sysfs file is not there so kernel is too old pvulnstatus $cve VULN "Your kernel doesn't support TAA mitigation, update it" else if [ -n "$kernel_taa" ]; then pvulnstatus $cve OK "Your kernel supports TAA mitigation" else pvulnstatus $cve VULN "Your kernel doesn't support TAA mitigation, update it" fi fi else if [ "$opt_paranoid" = 1 ]; then # in paranoid mode, TSX or SMT enabled are not OK, even if TAA is mitigated if ! echo "$fullmsg" | grep -qF 'TSX disabled'; then pvulnstatus $cve VULN "TSX must be disabled for full mitigation" elif echo "$fullmsg" | grep -qF 'SMT vulnerable'; then pvulnstatus $cve VULN "SMT (HyperThreading) must be disabled for full mitigation" else pvulnstatus $cve "$status" "$msg" fi else pvulnstatus $cve "$status" "$msg" fi fi } ####################### # iTLB Multihit section check_CVE_2018_12207() { cve='CVE-2018-12207' _info "\033[1;34m$cve aka '$(cve2name "$cve")'\033[0m" if [ "$os" = Linux ]; then check_CVE_2018_12207_linux #elif echo "$os" | grep -q BSD; then # check_CVE_2018_12207_bsd else _warn "Unsupported OS ($os)" fi } check_CVE_2018_12207_linux() { status=UNK sys_interface_available=0 msg='' if sys_interface_check "/sys/devices/system/cpu/vulnerabilities/itlb_multihit"; then # this kernel has the /sys interface, trust it over everything sys_interface_available=1 fi if [ "$opt_sysfs_only" != 1 ]; then check_has_vmm _info_nol "* iTLB Multihit mitigation is supported by kernel: " kernel_itlbmh='' if [ -n "$kernel_err" ]; then kernel_itlbmh_err="$kernel_err" # commit 5219505fcbb640e273a0d51c19c38de0100ec5a9 elif grep -q 'itlb_multihit' "$kernel"; then kernel_itlbmh="found itlb_multihit in kernel image" fi if [ -n "$kernel_itlbmh" ]; then pstatus green YES "$kernel_itlbmh" elif [ -n "$kernel_itlbmh_err" ]; then pstatus yellow UNKNOWN "$kernel_itlbmh_err" else pstatus yellow NO fi _info_nol "* iTLB Multihit mitigation enabled and active: " if [ "$opt_live" = 1 ]; then if [ -n "$fullmsg" ]; then if echo "$fullmsg" | grep -qF 'Mitigation'; then pstatus green YES "$fullmsg" else pstatus yellow NO fi else pstatus yellow NO "itlb_multihit not found in sysfs hierarchy" fi else pstatus blue N/A "not testable in offline mode" fi elif [ "$sys_interface_available" = 0 ]; then # we have no sysfs but were asked to use it only! msg="/sys vulnerability interface use forced, but it's not available!" status=UNK fi if ! is_cpu_vulnerable "$cve" ; then # override status & msg in case CPU is not vulnerable after all pvulnstatus "$cve" OK "your CPU vendor reported your CPU model as not vulnerable" elif [ "$has_vmm" = 0 ]; then pvulnstatus "$cve" OK "this system is not running a hypervisor" elif [ -z "$msg" ]; then # if msg is empty, sysfs check didn't fill it, rely on our own test if [ "$opt_live" = 1 ]; then # if we're in live mode and $msg is empty, sysfs file is not there so kernel is too old pvulnstatus $cve VULN "Your kernel doesn't support iTLB Multihit mitigation, update it" else if [ -n "$kernel_itlbmh" ]; then pvulnstatus $cve OK "Your kernel supports iTLB Multihit mitigation" else pvulnstatus $cve VULN "Your kernel doesn't support iTLB Multihit mitigation, update it" fi fi else pvulnstatus $cve "$status" "$msg" fi } ################### # SRBDS SECTION # Special Register Buffer Data Sampling (SRBDS) check_CVE_2020_0543() { cve='CVE-2020-0543' _info "\033[1;34m$cve aka '$(cve2name "$cve")'\033[0m" if [ "$os" = Linux ]; then check_CVE_2020_0543_linux else _warn "Unsupported OS ($os)" fi } check_CVE_2020_0543_linux() { status=UNK sys_interface_available=0 msg='' if sys_interface_check "/sys/devices/system/cpu/vulnerabilities/srbds"; then # this kernel has the /sys interface, trust it over everything sys_interface_available=1 fi if [ "$opt_sysfs_only" != 1 ]; then _info_nol "* SRBDS mitigation control is supported by the kernel: " kernel_srbds='' if [ -n "$kernel_err" ]; then kernel_srbds_err="$kernel_err" elif grep -q 'Dependent on hypervisor' "$kernel"; then kernel_srbds="found SRBDS implementation evidence in kernel image. Your kernel is up to date for SRBDS mitigation" fi if [ -n "$kernel_srbds" ]; then pstatus green YES "$kernel_srbds" elif [ -n "$kernel_srbds_err" ]; then pstatus yellow UNKNOWN "$kernel_srbds_err" else pstatus yellow NO fi _info_nol "* SRBDS mitigation control is enabled and active: " if [ "$opt_live" = 1 ]; then if [ -n "$fullmsg" ]; then if echo "$fullmsg" | grep -qE '^Mitigation'; then pstatus green YES "$fullmsg" else pstatus yellow NO fi else pstatus yellow NO "SRBDS not found in sysfs hierarchy" fi else pstatus blue N/A "not testable in offline mode" fi elif [ "$sys_interface_available" = 0 ]; then # we have no sysfs but were asked to use it only! msg="/sys vulnerability interface use forced, but it's not available!" status=UNK fi if ! is_cpu_vulnerable "$cve" ; then # override status & msg in case CPU is not vulnerable after all pvulnstatus "$cve" OK "your CPU vendor reported your CPU model as not vulnerable" else if [ "$opt_sysfs_only" != 1 ]; then if [ "$cpuid_srbds" = 1 ]; then # SRBDS mitigation control exists if [ "$srbds_on" = 1 ]; then # SRBDS mitigation control is enabled if [ -z "$msg" ]; then # if msg is empty, sysfs check didn't fill it, rely on our own test if [ "$opt_live" = 1 ]; then # if we're in live mode and $msg is empty, sysfs file is not there so kernel is too old pvulnstatus "$cve" OK "Your microcode is up to date for SRBDS mitigation control. The kernel needs to be updated" fi else if [ -n "$kernel_srbds" ]; then pvulnstatus "$cve" OK "Your microcode and kernel are both up to date for SRBDS mitigation control. Mitigation is enabled" else pvulnstatus "$cve" OK "Your microcode is up to date for SRBDS mitigation control. The kernel needs to be updated" fi fi elif [ "$srbds_on" = 0 ]; then # SRBDS mitigation control is disabled if [ -z "$msg" ]; then if [ "$opt_live" = 1 ]; then # if we're in live mode and $msg is empty, sysfs file is not there so kernel is too old pvulnstatus "$cve" VULN "Your microcode is up to date for SRBDS mitigation control. The kernel needs to be updated. Mitigation is disabled" fi else if [ -n "$kernel_srbds" ]; then pvulnstatus "$cve" VULN "Your microcode and kernel are both up to date for SRBDS mitigation control. Mitigation is disabled" else pvulnstatus "$cve" VULN "Your microcode is up to date for SRBDS mitigation control. The kernel needs to be updated. Mitigation is disabled" fi fi else # rdmsr: CPU 0 cannot read MSR 0x00000123 pvulnstatus "$cve" UNK "Not able to enumerate MSR for SRBDS mitigation control" fi else # [ $cpuid_srbds != 1 ] pvulnstatus "$cve" VULN "Your CPU microcode may need to be updated to mitigate the vulnerability" fi else # sysfs only: return the status/msg we got pvulnstatus "$cve" "$status" "$fullmsg" return fi fi } ####################### # END OF VULNS SECTIONS if [ "$opt_no_hw" = 0 ] && [ -z "$opt_arch_prefix" ]; then check_cpu check_cpu_vulnerabilities _info fi # now run the checks the user asked for for cve in $supported_cve_list do if [ "$opt_cve_all" = 1 ] || echo "$opt_cve_list" | grep -qw "$cve"; then check_"$(echo "$cve" | tr - _)" _info fi done if [ -n "$final_summary" ]; then _info "> \033[46m\033[30mSUMMARY:\033[0m$final_summary" _info "" fi if [ "$bad_accuracy" = 1 ]; then _warn "We're missing some kernel info (see -v), accuracy might be reduced" fi _vars=$(set | grep -Ev '^[A-Z_[:space:]]' | grep -v -F 'mockme=' | sort | tr "\n" '|') _debug "variables at end of script: $_vars" if [ -n "$mockme" ] && [ "$opt_mock" = 1 ]; then if command -v "gzip" >/dev/null 2>&1; then # not a useless use of cat: gzipping cpuinfo directly doesn't work well # shellcheck disable=SC2002 if command -v "base64" >/dev/null 2>&1; then mock_cpuinfo="$(cat /proc/cpuinfo | gzip -c | base64 -w0)" elif command -v "uuencode" >/dev/null 2>&1; then mock_cpuinfo="$(cat /proc/cpuinfo | gzip -c | uuencode -m - | grep -Fv 'begin-base64' | grep -Fxv -- '====' | tr -d "\n")" fi fi if [ -n "$mock_cpuinfo" ]; then mockme=$(printf "%b\n%b" "$mockme" "SMC_MOCK_CPUINFO='$mock_cpuinfo'") unset mock_cpuinfo fi _info "" # shellcheck disable=SC2046 _warn "To mock this CPU, set those vars: "$(echo "$mockme" | sort -u) fi if [ "$opt_explain" = 0 ]; then _info "Need more detailed information about mitigation options? Use --explain" fi _info "A false sense of security is worse than no security at all, see --disclaimer" if [ "$mocked" = 1 ]; then _info "" _warn "One or several values have been mocked. This should only be done when debugging/testing this script." _warn "The results do NOT reflect the actual status of the system we're running on." fi if [ "$opt_batch" = 1 ] && [ "$opt_batch_format" = "nrpe" ]; then if [ -n "$nrpe_vuln" ]; then echo "Vulnerable:$nrpe_vuln" else echo "OK" fi fi if [ "$opt_batch" = 1 ] && [ "$opt_batch_format" = "short" ]; then _echo 0 "${short_output% }" fi if [ "$opt_batch" = 1 ] && [ "$opt_batch_format" = "json" ]; then _echo 0 "${json_output%?}]" fi if [ "$opt_batch" = 1 ] && [ "$opt_batch_format" = "prometheus" ]; then echo "# TYPE specex_vuln_status untyped" echo "# HELP specex_vuln_status Exposure of system to speculative execution vulnerabilities" printf "%b\n" "$prometheus_output" fi # exit with the proper exit code [ "$global_critical" = 1 ] && exit 2 # critical [ "$global_unknown" = 1 ] && exit 3 # unknown exit 0 # ok # We're using MCE.db from the excellent platomav's MCExtractor project # The builtin version follows, but the user can download an up-to-date copy (to be stored in his $HOME) by using --update-fwdb # To update the builtin version itself (by *modifying* this very file), use --update-builtin-fwdb # %%% MCEDB v165.20201021+i20200616 # I,0x00000611,0x00000B27,19961218 # I,0x00000612,0x000000C6,19961210 # I,0x00000616,0x000000C6,19961210 # I,0x00000617,0x000000C6,19961210 # I,0x00000619,0x000000D2,19980218 # I,0x00000630,0x00000013,19960827 # I,0x00000632,0x00000020,19960903 # I,0x00000633,0x00000036,19980923 # I,0x00000634,0x00000037,19980923 # I,0x00000650,0x00000045,19990525 # I,0x00000651,0x00000042,19990525 # I,0x00000652,0x0000002D,19990518 # I,0x00000653,0x00000010,19990628 # I,0x00000660,0x0000000A,19990505 # I,0x00000665,0x00000003,19990505 # I,0x0000066A,0x0000000D,19990505 # I,0x0000066D,0x00000007,19990505 # I,0x00000670,0x00000007,19980602 # I,0x00000671,0x00000014,19980811 # I,0x00000672,0x00000038,19990922 # I,0x00000673,0x0000002E,19990910 # I,0x00000680,0x00000017,19990610 # I,0x00000681,0x00000014,19991209 # I,0x00000683,0x00000014,20010206 # I,0x00000686,0x00000008,20000505 # 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