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feat(inception): Zen1/2 IBPB and SMT checks

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Sébastien Mériot 2023-08-14 09:34:48 +00:00 committed by Stéphane Lesimple
parent dc6921a1ac
commit fb6933dc64
1 changed files with 23 additions and 1 deletions
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22
spectre-meltdown-checker.sh
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@ -6335,10 +6335,29 @@ check_CVE_2023_20569_linux() {
fi
if [ -n "$kernel_sro" ]; then
# TODO check mitigation
:
fi
# Zen & Zen2 : if the right IBPB microcode applied + SMT off --> not vuln
if [ "$cpu_family" = $(( 0x17 )) ]; then
_info_nol "* IBPB support: "
if [ -n "$cpuid_ibpb" ]; then
pstatus green YES "$cpuid_ibpb"
else
pstatus red NO
fi
_info_nol "* SMT is enabled: "
is_cpu_smt_enabled; smt_enabled=$?
if [ "$smt_enabled" = 0 ]; then
pstatus red YES
else
pstatus green NO
fi
fi
elif [ "$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!"
@ -6348,6 +6367,9 @@ check_CVE_2023_20569_linux() {
if ! is_cpu_affected "$cve" ; then
# override status & msg in case CPU is not vulnerable after all
pvulnstatus "$cve" OK "your CPU vendor reported your CPU model as not affected"
elif [ "$cpu_family" = $(( 0x17 )) ] && [ "$smt_enabled" = 1 ] && [ -n "$cpuid_ibpb" ]; then
pvulnstatus "$cve" OK "IBPB supported and SMT is off"
explain "Zen1/2 with SMT off aren't vulnerable after the right IBPB microcode has been applied. (https://github.com/torvalds/linux/commit/138bcddb86d8a4f842e4ed6f0585abc9b1a764ff#diff-17bd24a7a7850613cced545790ac30646097e8d6207348c2bd1845f397acb390R2272)"
elif [ -z "$msg" ]; then
# if msg is empty, sysfs check didn't fill it, rely on our own test
# TODO