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https://github.com/speed47/spectre-meltdown-checker.git
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enh(mock): avoid reading the sysfs interface outside sys_interface_check() for higher mocking coverage
This commit is contained in:
Stéphane Lesimple
parent
afbb26277f
commit
ccb4dbef7c
@ -1910,6 +1910,8 @@ sys_interface_check()
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file="$1"
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regex="$2"
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mode="$3"
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msg=''
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fullmsg=''
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[ "$opt_live" = 1 ] && [ "$opt_no_sysfs" = 0 ] && [ -r "$file" ] || return 1
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[ -n "$regex" ] || regex='.*'
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_mockvarname="SMC_MOCK_SYSFS_$(basename "$file")"
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@ -1924,7 +1926,9 @@ sys_interface_check()
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msg=$(grep -Eo "$regex" "$file")
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fi
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if [ "$mode" = silent ]; then
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_info "* Information from the /sys interface: $msg"
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return 0
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elif [ "$mode" = quiet ]; then
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_info "* Information from the /sys interface: $fullmsg"
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return 0
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fi
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_info_nol "* Mitigated according to the /sys interface: "
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@ -2913,21 +2917,21 @@ check_CVE_2017_5715_linux()
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# XXX and what about ibpb ?
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fi
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fi
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if [ -e "/sys/devices/system/cpu/vulnerabilities/spectre_v2" ]; then
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if [ -n "$fullmsg" ]; then
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# when IBPB is enabled on 4.15+, we can see it in sysfs
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if grep -q 'IBPB' "/sys/devices/system/cpu/vulnerabilities/spectre_v2"; then
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if echo "$fullmsg" | grep -q 'IBPB'; then
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_debug "ibpb: found enabled in sysfs"
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[ -z "$ibpb_supported" ] && ibpb_supported='IBPB found enabled in sysfs'
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[ -z "$ibpb_enabled" ] && ibpb_enabled=1
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fi
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# when IBRS_FW is enabled on 4.15+, we can see it in sysfs
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if grep -q ', IBRS_FW' "/sys/devices/system/cpu/vulnerabilities/spectre_v2"; then
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if echo "$fullmsg" | grep -q ', IBRS_FW'; then
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_debug "ibrs: found IBRS_FW in sysfs"
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[ -z "$ibrs_supported" ] && ibrs_supported='found IBRS_FW in sysfs'
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ibrs_fw_enabled=1
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fi
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# when IBRS is enabled on 4.15+, we can see it in sysfs
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if grep -q -e '\<IBRS\>' -e 'Indirect Branch Restricted Speculation' "/sys/devices/system/cpu/vulnerabilities/spectre_v2"; then
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if echo "$fullmsg" | grep -q -e '\<IBRS\>' -e 'Indirect Branch Restricted Speculation'; then
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_debug "ibrs: found IBRS in sysfs"
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[ -z "$ibrs_supported" ] && ibrs_supported='found IBRS in sysfs'
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[ -z "$ibrs_enabled" ] && ibrs_enabled=3
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@ -3112,9 +3116,9 @@ check_CVE_2017_5715_linux()
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#
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# if there is "retpoline" in the file and NOT "minimal", then it's full retpoline
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# (works for vanilla and Red Hat variants)
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if [ "$opt_live" = 1 ] && [ -e "/sys/devices/system/cpu/vulnerabilities/spectre_v2" ]; then
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if grep -qwi retpoline /sys/devices/system/cpu/vulnerabilities/spectre_v2; then
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if grep -qwi minimal /sys/devices/system/cpu/vulnerabilities/spectre_v2; then
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if [ "$opt_live" = 1 ] && [ -n "$fullmsg" ]; then
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if echo "$fullmsg" | grep -qwi retpoline; then
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if echo "$fullmsg" | grep -qwi minimal; then
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retpoline_compiler=0
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retpoline_compiler_reason="kernel reports minimal retpoline compilation"
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else
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@ -3935,7 +3939,7 @@ check_CVE_2018_3620_linux()
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status=UNK
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sys_interface_available=0
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msg=''
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if sys_interface_check "/sys/devices/system/cpu/vulnerabilities/l1tf" '^[^;]+'; then
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if sys_interface_check "/sys/devices/system/cpu/vulnerabilities/l1tf"; then
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# this kernel has the /sys interface, trust it over everything
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sys_interface_available=1
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fi
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@ -3956,8 +3960,8 @@ check_CVE_2018_3620_linux()
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_info_nol "* PTE inversion enabled and active: "
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if [ "$opt_live" = 1 ]; then
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if [ "$sys_interface_available" = 1 ]; then
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if grep -q 'Mitigation: PTE Inversion' /sys/devices/system/cpu/vulnerabilities/l1tf; then
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if [ -n "$fullmsg" ]; then
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if echo "$fullmsg" | grep -q 'Mitigation: PTE Inversion'; then
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pstatus green YES
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pteinv_active=1
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else
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@ -4047,7 +4051,7 @@ check_CVE_2018_3646_linux()
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status=UNK
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sys_interface_available=0
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msg=''
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if sys_interface_check "/sys/devices/system/cpu/vulnerabilities/l1tf" 'VMX:.*' silent; then
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if sys_interface_check "/sys/devices/system/cpu/vulnerabilities/l1tf" '.*' quiet; then
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# this kernel has the /sys interface, trust it over everything
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sys_interface_available=1
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fi
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@ -4136,18 +4140,19 @@ check_CVE_2018_3646_linux()
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_info_nol " * L1D flush enabled: "
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if [ "$opt_live" = 1 ]; then
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if [ -r "/sys/devices/system/cpu/vulnerabilities/l1tf" ]; then
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if [ -n "$fullmsg" ]; then
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# vanilla: VMX: $l1dstatus, SMT $smtstatus
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# Red Hat: VMX: SMT $smtstatus, L1D $l1dstatus
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# $l1dstatus is one of (auto|vulnerable|conditional cache flushes|cache flushes|EPT disabled|flush not necessary)
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# $smtstatus is one of (vulnerable|disabled)
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if grep -Eq '(VMX:|L1D) (EPT disabled|vulnerable|flush not necessary)' "/sys/devices/system/cpu/vulnerabilities/l1tf"; then
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# can also just be "Not affected"
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if echo "$fullmsg" | grep -Eq -e 'Not affected' -e '(VMX:|L1D) (EPT disabled|vulnerable|flush not necessary)'; then
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l1d_mode=0
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pstatus yellow NO
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elif grep -Eq '(VMX:|L1D) conditional cache flushes' "/sys/devices/system/cpu/vulnerabilities/l1tf"; then
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elif echo "$fullmsg" | grep -Eq '(VMX:|L1D) conditional cache flushes'; then
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l1d_mode=1
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pstatus green YES "conditional flushes"
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elif grep -Eq '(VMX:|L1D) cache flushes' "/sys/devices/system/cpu/vulnerabilities/l1tf"; then
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elif echo "$fullmsg" | grep -Eq '(VMX:|L1D) cache flushes'; then
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l1d_mode=2
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pstatus green YES "unconditional flushes"
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else
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@ -4214,6 +4219,9 @@ check_CVE_2018_3646_linux()
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if ! is_cpu_vulnerable "$cve"; then
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# override status & msg in case CPU is not vulnerable after all
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pvulnstatus $cve OK "your CPU vendor reported your CPU model as not vulnerable"
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elif [ "$fullmsg" = "Not affected" ]; then
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# just in case a very recent kernel knows better than we do
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pvulnstatus $cve OK "your kernel reported your CPU model as not vulnerable"
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elif [ "$has_vmm" = 0 ]; then
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pvulnstatus $cve OK "this system is not running a hypervisor"
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else
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@ -4375,7 +4383,7 @@ check_mds()
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if [ "$opt_live" = 1 ] && [ "$sys_interface_available" = 1 ]; then
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_info_nol "* Kernel mitigation is enabled and active: "
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if grep -qi ^mitigation /sys/devices/system/cpu/vulnerabilities/mds; then
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if echo "$fullmsg" | grep -qi ^mitigation; then
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mds_mitigated=1
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pstatus green YES
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else
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@ -4383,7 +4391,7 @@ check_mds()
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pstatus yellow NO
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fi
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_info_nol "* SMT is either mitigated or disabled: "
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if grep -Eq 'SMT (disabled|mitigated)' /sys/devices/system/cpu/vulnerabilities/mds; then
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if echo "$fullmsg" | grep -Eq 'SMT (disabled|mitigated)'; then
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mds_smt_mitigated=1
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pstatus green YES
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else
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@ -4431,7 +4439,7 @@ check_mds()
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else
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if [ "$opt_paranoid" = 1 ]; then
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# in paranoid mode, we don't only need microcode + kernel update, we also want SMT mitigation
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if grep -qF -e 'SMT mitigated' -e 'SMT disabled' /sys/devices/system/cpu/vulnerabilities/mds; then
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if echo "$fullmsg" | grep -qF -e 'SMT mitigated' -e 'SMT disabled'; then
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pvulnstatus "$cve" OK "$fullmsg"
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else
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pvulnstatus "$cve" VULN "Your kernel and microcode partially mitigate the vulnerability, but you must disable SMT (Hyper-Threading) for a complete mitigation"
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