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arm64: variant 4: detect ssbd mitigation from kernel img, system.map or kconfig

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This commit is contained in:
Stéphane Lesimple 2020-06-06 18:27:29 +02:00
parent 23564cda5d
commit 3a486e9985
1 changed files with 21 additions and 4 deletions
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25
spectre-meltdown-checker.sh
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@ -4415,14 +4415,31 @@ check_CVE_2018_3639_linux()
_debug "found Speculation.Store.Bypass: in $procfs/self/status"
fi
fi
if [ -z "$kernel_ssb" ] && [ -n "$kernel" ]; then
# arm64 kernels can have cpu_show_spec_store_bypass with ARM64_SSBD, so exclude them
if [ -z "$kernel_ssb" ] && [ -n "$kernel" ] && ! grep -q 'arm64_sys_' "$kernel"; then
kernel_ssb=$("${opt_arch_prefix}strings" "$kernel" | grep spec_store_bypass | head -n1);
[ -n "$kernel_ssb" ] && _debug "found $kernel_ssb in kernel"
[ -n "$kernel_ssb" ] && kernel_ssb="found $kernel_ssb in kernel"
fi
# arm64 kernels can have cpu_show_spec_store_bypass with ARM64_SSBD, so exclude them
if [ -z "$kernel_ssb" ] && [ -n "$opt_map" ] && ! grep -q 'arm64_sys_' "$opt_map"; then
kernel_ssb=$(grep spec_store_bypass "$opt_map" | awk '{print $3}' | head -n1)
[ -n "$kernel_ssb" ] && kernel_ssb="found $kernel_ssb in System.map"
fi
# arm64 only:
if [ -z "$kernel_ssb" ] && [ -n "$opt_map" ]; then
kernel_ssb=$(grep spec_store_bypass "$opt_map" | head -n1)
[ -n "$kernel_ssb" ] && _debug "found $kernel_ssb in System.map"
kernel_ssb=$(grep -w cpu_enable_ssbs "$opt_map" | awk '{print $3}' | head -n1)
[ -n "$kernel_ssb" ] && kernel_ssb="found $kernel_ssb in System.map"
fi
if [ -z "$kernel_ssb" ] && [ -n "$opt_config" ]; then
kernel_ssb=$(grep -w 'CONFIG_ARM64_SSBD=y' "$opt_config")
[ -n "$kernel_ssb" ] && kernel_ssb="CONFIG_ARM64_SSBD enabled in kconfig"
fi
if [ -z "$kernel_ssb" ] && [ -n "$kernel" ]; then
# this string only appears in kernel if CONFIG_ARM64_SSBD is set
kernel_ssb=$(grep -w "Speculative Store Bypassing Safe (SSBS)" "$kernel")
[ -n "$kernel_ssb" ] && kernel_ssb="found 'Speculative Store Bypassing Safe (SSBS)' in kernel"
fi
# /arm64 only
if [ -n "$kernel_ssb" ]; then
pstatus green YES "$kernel_ssb"