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feat(downfall): detection of the kernel mitigation relying on dmesg

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Sébastien Mériot 2023-08-10 09:05:44 +00:00 committed by Stéphane Lesimple
parent ba0daa6769
commit c1c1ac4dbb
1 changed files with 20 additions and 2 deletions
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22
spectre-meltdown-checker.sh
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@ -6222,7 +6222,7 @@ check_CVE_2022_40982_linux() {
pstatus yellow NO
fi
_info_nol "* Kernel supports software mitigation by disabling AVX: "
if [ -n "$kernel_err" ]; then
if [ -n "$kernel_err" ]; then
kernel_gds_err="$kernel_err"
elif grep -q 'gather_data_sampling' "$kernel"; then
kernel_gds="found gather_data_sampling in kernel image"
@ -6234,6 +6234,22 @@ check_CVE_2022_40982_linux() {
else
pstatus yellow NO
fi
if [ -n "$kernel_gds" ]; then
_info_nol "* Is the kernel mitigation active: "
# Check dmesg message to see whether AVX has been disabled
dmesg_grep 'Microcode update needed! Disabling AVX as mitigation'; ret=$?
if [ $ret -eq 2 ]; then
pstatus yellow UNKNOWN "dmesg truncated, AVX mitigation detection will be unreliable. Please reboot and relaunch this script"
elif [ $ret -eq 0 ]; then
kernel_avx_disabled="AVX disabled by the kernel"
pstatus green YES "$kernel_avx_disabled"
else
pstatus red NO "No trace of AVX mitigation in dmesg"
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!"
@ -6251,8 +6267,10 @@ check_CVE_2022_40982_linux() {
pvulnstatus $cve VULN "Your microcode is up to date but mitigation is disabled"
elif [ -z "$kernel_gds" ]; then
pvulnstatus $cve VULN "Your microcode doesn't mitigate the vulnerability, and your kernel doesn't support mitigation"
elif [ -z "$kernel_avx_disabled" ]; then
pvulnstatus $cve VULN "Your microcode doesn't mitigate the vulnerability, your kernel support the mitigation but the script did not detect AVX as disabled by the kernel"
else
pvulnstatus $cve UNK "Your microcode doesn't mitigate the vulnerability, your kernel supports mitigation, but mitigation detection is not implemented yet so we don't know whether it's active"
pvulnstatus $cve OK "Your microcode doesn't mitigate the vulnerability, but your kernel has disabled AVX support"
fi
else
pvulnstatus $cve "$status" "$msg"