mirror of
https://github.com/speed47/spectre-meltdown-checker.git
synced 2025-10-31 12:40:57 +01:00
251 lines
7.2 KiB
Bash
Executable File
251 lines
7.2 KiB
Bash
Executable File
#! /bin/sh
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# Spectre & Meltdown checker
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# Stephane Lesimple
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VERSION=0.04
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pstatus()
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{
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case "$1" in
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red) col="\033[101m\033[30m";;
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green) col="\033[102m\033[30m";;
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yellow) col="\033[103m\033[30m";;
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*) col="";;
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esac
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/bin/echo -ne "$col$2\033[0m"
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[ -n "$3" ] && /bin/echo -n " ($3)"
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/bin/echo
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}
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# ----------------------------------------------------------------------
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# extract-vmlinux - Extract uncompressed vmlinux from a kernel image
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#
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# Inspired from extract-ikconfig
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# (c) 2009,2010 Dick Streefland <dick@streefland.net>
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#
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# (c) 2011 Corentin Chary <corentin.chary@gmail.com>
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#
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# Licensed under the GNU General Public License, version 2 (GPLv2).
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# ----------------------------------------------------------------------
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check_vmlinux()
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{
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file "$1" 2>/dev/null | grep -q ELF || return 1
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return 0
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}
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try_decompress()
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{
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# The obscure use of the "tr" filter is to work around older versions of
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# "grep" that report the byte offset of the line instead of the pattern.
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# Try to find the header ($1) and decompress from here
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for pos in `tr "$1\n$2" "\n$2=" < "$img" | grep -abo "^$2"`
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do
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pos=${pos%%:*}
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tail -c+$pos "$img" | $3 > $vmlinuxtmp 2> /dev/null
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check_vmlinux $vmlinuxtmp && echo $vmlinuxtmp || rm -f $vmlinuxtmp
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done
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}
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extract_vmlinux()
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{
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img="$1"
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# Prepare temp files:
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vmlinuxtmp=$(mktemp /tmp/vmlinux-XXX)
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# Initial attempt for uncompressed images or objects:
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check_vmlinux $img
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# That didn't work, so retry after decompression.
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try_decompress '\037\213\010' xy gunzip || \
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try_decompress '\3757zXZ\000' abcde unxz || \
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try_decompress 'BZh' xy bunzip2 || \
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try_decompress '\135\0\0\0' xxx unlzma || \
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try_decompress '\211\114\132' xy 'lzop -d'
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}
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/bin/echo "Spectre and Meltdown mitigation detection tool v$VERSION"
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/bin/echo
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# SPECTRE 1
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/bin/echo -e "\033[1;34mCVE-2017-5753 [bounds check bypass] aka 'Spectre Variant 1'\033[0m"
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/bin/echo -n "* Kernel compiled with LFENCE opcode inserted at the proper places: "
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status=0
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img=''
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[ -e /boot/vmlinuz-$(uname -r) ] && img=/boot/vmlinuz-$(uname -r)
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[ -e /boot/vmlinux-$(uname -r) ] && img=/boot/vmlinux-$(uname -r)
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[ -e /boot/bzImage-$(uname -r) ] && img=/boot/bzImage-$(uname -r)
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if [ -z "$img" ]; then
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pstatus yellow UNKNOWN "couldn't find your kernel image in /boot"
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else
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vmlinux=$(extract_vmlinux $img)
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if [ -z "$vmlinux" -o ! -r "$vmlinux" ]; then
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pstatus yellow UNKNOWN "couldn't extract your kernel"
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elif ! which objdump >/dev/null 2>&1; then
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pstatus yellow UNKNOWN "missing 'objdump' tool, please install it, usually it's in the binutils package"
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else
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nb_lfence=$(objdump -D "$vmlinux" | grep -wc lfence)
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if [ "$nb_lfence" -lt 60 ]; then
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pstatus red NO "only $nb_lfence opcodes found, should be >= 60"
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status=1
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else
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pstatus green YES "$nb_lfence opcodes found, which is >= 60"
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status=2
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fi
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rm -f $vmlinux
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fi
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fi
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/bin/echo -ne "> \033[46m\033[30mSTATUS:\033[0m "
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[ "$status" = 0 ] && pstatus yellow UNKNOWN
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[ "$status" = 1 ] && pstatus red VULNERABLE
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[ "$status" = 2 ] && pstatus green 'NOT VULNERABLE'
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# VARIANT 2
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/bin/echo
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/bin/echo -e "\033[1;34mCVE-2017-5715 [branch target injection] aka 'Spectre Variant 2'\033[0m"
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/bin/echo "* Mitigation 1"
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/bin/echo -n "* Hardware (CPU microcode) support for mitigation: "
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if [ ! -e /dev/cpu/0/msr ]; then
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modprobe msr 2>/dev/null && insmod_msr=1
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fi
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if [ ! -e /dev/cpu/0/msr ]; then
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pstatus yellow UNKNOWN "couldn't read /dev/cpu/0/msr, is msr support enabled in your kernel?"
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else
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dd if=/dev/cpu/0/msr of=/dev/null bs=1 count=8 skip=72 2>/dev/null
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if [ $? -eq 0 ]; then
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pstatus green YES
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else
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pstatus red NO
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fi
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#dd if=/dev/cpu/0/msr of=/dev/null bs=1 count=8 skip=73 2>/dev/null
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#/bin/echo $?
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fi
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if [ "$insmod_msr" = 1 ]; then
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rmmod msr 2>/dev/null
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fi
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/bin/echo -n "* Kernel support for IBRS: "
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if [ -e /sys/kernel/debug/sched_features ]; then
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mount -t debugfs debugfs /sys/kernel/debug 2>/dev/null && mounted_debugfs=1
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fi
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if [ -e /sys/kernel/debug/ibrs_enabled ]; then
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pstatus green YES
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ibrs_supported=1
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else
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pstatus red NO
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fi
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ibrs_enabled=$(cat /sys/kernel/debug/ibrs_enabled 2>/dev/null)
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/bin/echo -n "* IBRS enabled for Kernel space: "
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case "$ibrs_enabled" in
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"") [ "$ibrs_supported" = 1 ] && pstatus yellow UNKNOWN || pstatus red NO;;
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0) pstatus red NO;;
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1 | 2) pstatus green YES;;
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*) pstatus yellow UNKNOWN;;
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esac
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/bin/echo -n "* IBRS enabled for User space: "
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case "$ibrs_enabled" in
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"") [ "$ibrs_supported" = 1 ] && pstatus yellow UNKNOWN || pstatus red NO;;
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0 | 1) pstatus red NO;;
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2) pstatus green YES;;
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*) pstatus yellow unknown;;
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esac
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if [ "$mounted_debugfs" = 1 ]; then
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umount /sys/kernel/debug
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fi
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/bin/echo "* Mitigation 2"
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/bin/echo -n "* Kernel recompiled with retpolines: "
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# XXX this doesn't mean the kernel has been compiled with a retpoline-aware gcc
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if [ -e /proc/config.gz ]; then
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if zgrep -q '^CONFIG_RETPOLINE=y' /proc/config.gz; then
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pstatus green YES
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retpoline=1
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else
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pstatus red NO
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fi
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elif [ -e /boot/config-$(uname -r) ]; then
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if grep -q '^CONFIG_RETPOLINE=y' /boot/config-$(uname -r); then
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pstatus green YES
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retpoline=1
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else
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pstatus red NO
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fi
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fi
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/bin/echo -ne "> \033[46m\033[30mSTATUS:\033[0m "
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if grep -q AMD /proc/cpuinfo; then
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pstatus green "NOT VULNERABLE" "your CPU is not vulnerable as per the vendor"
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elif [ "$ibrs_enabled" = 1 -o "$ibrs_enabled" = 2 ]; then
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pstatus green "NOT VULNERABLE" "IBRS mitigates the vulnerability"
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elif [ "$retpoline" = 1 ]; then
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pstatus green "NOT VULNERABLE" "retpolines mitigate the vulnerability"
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else
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pstatus red VULNERABLE "IBRS hardware + kernel support OR kernel with retpolines are needed to mitigate the vulnerability"
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fi
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# MELTDOWN
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/bin/echo
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/bin/echo -e "\033[1;34mCVE-2017-5754 [rogue data cache load] aka 'Meltdown' aka 'Variant 3'\033[0m"
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/bin/echo -n "* Kernel supports Page Table Isolation (PTI): "
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if [ -e /proc/config.gz ]; then
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if zgrep -q '^CONFIG_PAGE_TABLE_ISOLATION=y' /proc/config.gz; then
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pstatus green YES
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kpti_support=1
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else
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pstatus red NO
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fi
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elif [ -e /boot/config-$(uname -r) ]; then
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if grep -q '^CONFIG_PAGE_TABLE_ISOLATION=y' /boot/config-$(uname -r); then
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pstatus green YES
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kpti_support=1
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else
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pstatus red NO
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fi
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elif [ -e /boot/System.map-$(uname -r) ]; then
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if grep -qw kpti_force_enabled /boot/System.map-$(uname -r); then
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pstatus green YES
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kpti_support=1
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else
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pstatus red NO
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fi
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else
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pstatus yellow UNKNOWN
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fi
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/bin/echo -n "* PTI enabled and active: "
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if grep ^flags /proc/cpuinfo | grep -qw pti; then
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pstatus green YES
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kpti_enabled=1
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elif dmesg | grep -q 'Kernel/User page tables isolation: enabled'; then
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pstatus green YES
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kpti_enabled=1
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else
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pstatus red NO
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fi
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/bin/echo -ne "> \033[46m\033[30mSTATUS:\033[0m "
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if grep -q AMD /proc/cpuinfo; then
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pstatus green "NOT VULNERABLE" "your CPU is not vulnerable as per the vendor"
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elif [ "$kpti_enabled" = 1 ]; then
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pstatus green "NOT VULNERABLE" "PTI mitigates the vulnerability"
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else
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pstatus red "VULNERABLE" "PTI is needed to mitigate the vulnerability"
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fi
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/bin/echo
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if [ "$USER" != root ]; then
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/bin/echo "Note that you should launch this script with root privileges to get accurate information"
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/bin/echo "You can try the following command: sudo $0"
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fi
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