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feat: implement Retbleed (CVE-2022-29900 CVE-2022-29901) mitigation detection

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Stéphane Lesimple
2026-04-02 22:12:56 +02:00
parent d644941a76
commit 4f6dbb36c8
6 changed files with 458 additions and 5 deletions
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36
src/libs/200_cpu_affected.sh
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@@ -104,6 +104,8 @@ is_cpu_affected() {
_set_immune inception
# TSA is AMD specific (Zen 3/4), look for "is_amd" below:
_set_immune tsa
# Retbleed: AMD (CVE-2022-29900) and Intel (CVE-2022-29901) specific:
_set_immune retbleed
# Downfall & Reptar are Intel specific, look for "is_intel" below:
_set_immune downfall
_set_immune reptar
@@ -203,7 +205,7 @@ is_cpu_affected() {
[ "$cpu_model" = "$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_SILVERMONT_MID2" ] ||
[ "$cpu_model" = "$INTEL_FAM6_ATOM_AIRMONT_NP" ] ||
[ "$cpu_model" = "$INTEL_FAM6_ATOM_GOLDMONT" ] ||
[ "$cpu_model" = "$INTEL_FAM6_ATOM_GOLDMONT_D" ] ||
@@ -314,6 +316,27 @@ is_cpu_affected() {
fi
done
# Retbleed (Intel, CVE-2022-29901): Skylake through Rocket Lake, or any CPU with RSBA
# kernel cpu_vuln_blacklist for RETBLEED (6b80b59b3555, 6ad0ad2bf8a6, f54d45372c6a)
# plus ARCH_CAP_RSBA catch-all (bit 2 of IA32_ARCH_CAPABILITIES)
if [ "$cap_rsba" = 1 ]; then
_set_vuln retbleed
elif [ "$cpu_family" = 6 ]; then
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" ] ||
[ "$cpu_model" = "$INTEL_FAM6_CANNONLAKE_L" ] ||
[ "$cpu_model" = "$INTEL_FAM6_ICELAKE_L" ] ||
[ "$cpu_model" = "$INTEL_FAM6_COMETLAKE" ] ||
[ "$cpu_model" = "$INTEL_FAM6_COMETLAKE_L" ] ||
[ "$cpu_model" = "$INTEL_FAM6_LAKEFIELD" ] ||
[ "$cpu_model" = "$INTEL_FAM6_ROCKETLAKE" ]; then
_set_vuln retbleed
fi
fi
elif is_amd || is_hygon; then
# AMD revised their statement about affected_variant2 => affected
# https://www.amd.com/en/corporate/speculative-execution
@@ -350,6 +373,11 @@ is_cpu_affected() {
_set_vuln tsa
fi
# Retbleed (AMD, CVE-2022-29900): families 0x15-0x17 (kernel X86_BUG_RETBLEED)
if [ "$cpu_family" = $((0x15)) ] || [ "$cpu_family" = $((0x16)) ] || [ "$cpu_family" = $((0x17)) ]; then
_set_vuln retbleed
fi
elif [ "$cpu_vendor" = CAVIUM ]; then
_set_immune variant3
_set_immune variant3a
@@ -473,7 +501,7 @@ is_cpu_affected() {
[ "$cpu_model" = "$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_SILVERMONT_MID2" ] ||
[ "$cpu_model" = "$INTEL_FAM6_ATOM_GOLDMONT" ] ||
[ "$cpu_model" = "$INTEL_FAM6_ATOM_GOLDMONT_D" ] ||
[ "$cpu_model" = "$INTEL_FAM6_ATOM_GOLDMONT_PLUS" ]; then
@@ -492,12 +520,12 @@ is_cpu_affected() {
_infer_immune itlbmh
fi
# shellcheck disable=SC2154 # affected_zenbleed/inception/tsa/downfall/reptar set via eval (_set_immune)
# shellcheck disable=SC2154 # affected_zenbleed/inception/retbleed/tsa/downfall/reptar set via eval (_set_immune)
{
pr_debug "is_cpu_affected: final results: variant1=$affected_variant1 variant2=$affected_variant2 variant3=$affected_variant3 variant3a=$affected_variant3a"
pr_debug "is_cpu_affected: final results: variant4=$affected_variant4 variantl1tf=$affected_variantl1tf msbds=$affected_msbds mfbds=$affected_mfbds"
pr_debug "is_cpu_affected: final results: mlpds=$affected_mlpds mdsum=$affected_mdsum taa=$affected_taa itlbmh=$affected_itlbmh srbds=$affected_srbds"
pr_debug "is_cpu_affected: final results: zenbleed=$affected_zenbleed inception=$affected_inception tsa=$affected_tsa downfall=$affected_downfall reptar=$affected_reptar"
pr_debug "is_cpu_affected: final results: zenbleed=$affected_zenbleed inception=$affected_inception retbleed=$affected_retbleed tsa=$affected_tsa downfall=$affected_downfall reptar=$affected_reptar"
}
affected_variantl1tf_sgx="$affected_variantl1tf"
# even if we are affected to L1TF, if there's no SGX, we're not affected to the original foreshadow