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feat: implement check for MMIO Stale Data (CVE-2022-21123 CVE-2022-21125 CVE-2022-21166) (#437)

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Stéphane Lesimple
2026-04-06 11:25:51 +02:00
parent 0fa7e44327
commit b0bb1f4676
11 changed files with 402 additions and 4 deletions
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55
src/libs/210_cpu_detect.sh
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@@ -156,6 +156,61 @@ is_cpu_srbds_free() {
}
# Check whether the CPU is known to be unaffected by MMIO Stale Data (CVE-2022-21123/21125/21166)
# Returns: 0 if MMIO-free, 1 if affected or unknown
is_cpu_mmio_free() {
# source: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/arch/x86/kernel/cpu/common.c
#
# CPU affection logic from kernel (51802186158c, v5.19):
# Bug is set when: cpu_matches(blacklist, MMIO) AND NOT arch_cap_mmio_immune()
# arch_cap_mmio_immune() requires ALL THREE bits set:
# ARCH_CAP_FBSDP_NO (bit 14) AND ARCH_CAP_PSDP_NO (bit 15) AND ARCH_CAP_SBDR_SSDP_NO (bit 13)
#
# Intel Family 6 model blacklist (unchanged since v5.19):
# HASWELL_X (0x3F)
# BROADWELL_D (0x56), BROADWELL_X (0x4F)
# SKYLAKE_X (0x55), SKYLAKE_L (0x4E), SKYLAKE (0x5E)
# KABYLAKE_L (0x8E), KABYLAKE (0x9E)
# ICELAKE_L (0x7E), ICELAKE_D (0x6C), ICELAKE_X (0x6A)
# COMETLAKE (0xA5), COMETLAKE_L (0xA6)
# LAKEFIELD (0x8A)
# ROCKETLAKE (0xA7)
# ATOM_TREMONT (0x96), ATOM_TREMONT_D (0x86), ATOM_TREMONT_L (0x9C)
#
# Vendor scope: Intel only. Non-Intel CPUs are not affected.
parse_cpu_details
# ARCH_CAP immunity: all three bits must be set
if [ "$cap_sbdr_ssdp_no" = 1 ] && [ "$cap_fbsdp_no" = 1 ] && [ "$cap_psdp_no" = 1 ]; then
return 0
fi
if is_intel; then
if [ "$cpu_family" = 6 ]; then
if [ "$cpu_model" = "$INTEL_FAM6_HASWELL_X" ] ||
[ "$cpu_model" = "$INTEL_FAM6_BROADWELL_D" ] ||
[ "$cpu_model" = "$INTEL_FAM6_BROADWELL_X" ] ||
[ "$cpu_model" = "$INTEL_FAM6_SKYLAKE_X" ] ||
[ "$cpu_model" = "$INTEL_FAM6_SKYLAKE_L" ] ||
[ "$cpu_model" = "$INTEL_FAM6_SKYLAKE" ] ||
[ "$cpu_model" = "$INTEL_FAM6_KABYLAKE_L" ] ||
[ "$cpu_model" = "$INTEL_FAM6_KABYLAKE" ] ||
[ "$cpu_model" = "$INTEL_FAM6_ICELAKE_L" ] ||
[ "$cpu_model" = "$INTEL_FAM6_ICELAKE_D" ] ||
[ "$cpu_model" = "$INTEL_FAM6_ICELAKE_X" ] ||
[ "$cpu_model" = "$INTEL_FAM6_COMETLAKE" ] ||
[ "$cpu_model" = "$INTEL_FAM6_COMETLAKE_L" ] ||
[ "$cpu_model" = "$INTEL_FAM6_LAKEFIELD" ] ||
[ "$cpu_model" = "$INTEL_FAM6_ROCKETLAKE" ] ||
[ "$cpu_model" = "$INTEL_FAM6_ATOM_TREMONT" ] ||
[ "$cpu_model" = "$INTEL_FAM6_ATOM_TREMONT_D" ] ||
[ "$cpu_model" = "$INTEL_FAM6_ATOM_TREMONT_L" ]; then
return 1
fi
fi
fi
return 0
}
# Check whether the CPU is known to be unaffected by Speculative Store Bypass (SSB)
# Returns: 0 if SSB-free, 1 if affected or unknown
is_cpu_ssb_free() {