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feat: add blacklisted Intel ucode detection

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Some Intel microcodes are known to cause instabilities
such as random reboots. Intel advises to revert to a
previous version if a newer one that fixes those issues
is not available. Detect such known bad microcodes.
This commit is contained in:
Stéphane Lesimple 2018-01-26 12:58:07 +01:00
parent 9f00ffa5af
commit 03d2dfe008
1 changed files with 78 additions and 0 deletions
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78
spectre-meltdown-checker.sh
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@ -625,6 +625,71 @@ is_coreos()
return 1
}
is_ucode_blacklisted()
{
# if it's not an Intel, don't bother: it's not blacklisted
grep -q GenuineIntel /proc/cpuinfo || return 1
# it also needs to be family=6
grep -qE '^cpu family.+ 6$' /proc/cpuinfo || return 1
cpu_model=$( grep '^model' /proc/cpuinfo | awk '{print $3}' | grep -E '^[0-9]+$' | head -1)
cpu_stepping=$(grep '^stepping' /proc/cpuinfo | awk '{print $3}' | grep -E '^[0-9]+$' | head -1)
cpu_ucode=$(grep '^microcode' /proc/cpuinfo | awk '{print $3}' | head -1)
# now, check each known bad microcode
# source: http://lkml.iu.edu/hypermail/linux/kernel/1801.2/06349.html
INTEL_FAM6_KABYLAKE_DESKTOP=158
INTEL_FAM6_KABYLAKE_MOBILE=142
INTEL_FAM6_SKYLAKE_X=85
INTEL_FAM6_SKYLAKE_MOBILE=78
INTEL_FAM6_SKYLAKE_DESKTOP=94
INTEL_FAM6_BROADWELL_CORE=61
INTEL_FAM6_BROADWELL_GT3E=71
INTEL_FAM6_HASWELL_ULT=69
INTEL_FAM6_HASWELL_GT3E=70
INTEL_FAM6_HASWELL_CORE=60
INTEL_FAM6_IVYBRIDGE_X=62
INTEL_FAM6_HASWELL_X=63
INTEL_FAM6_BROADWELL_XEON_D=86
INTEL_FAM6_BROADWELL_GT3E=71
INTEL_FAM6_BROADWELL_X=79
# model,stepping,microcode
for tuple in \
$INTEL_FAM6_KABYLAKE_DESKTOP,0x0B,0x80 \
$INTEL_FAM6_KABYLAKE_MOBILE,0x0A,0x80 \
$INTEL_FAM6_KABYLAKE_MOBILE,0x09,0x80 \
$INTEL_FAM6_KABYLAKE_DESKTOP,0x09,0x80 \
$INTEL_FAM6_SKYLAKE_X,0x04,0x0200003C \
$INTEL_FAM6_SKYLAKE_MOBILE,0x03,0x000000C2 \
$INTEL_FAM6_SKYLAKE_DESKTOP,0x03,0x000000C2 \
$INTEL_FAM6_BROADWELL_CORE,0x04,0x28 \
$INTEL_FAM6_BROADWELL_GT3E,0x01,0x0000001B \
$INTEL_FAM6_HASWELL_ULT,0x01,0x21 \
$INTEL_FAM6_HASWELL_GT3E,0x01,0x18 \
$INTEL_FAM6_HASWELL_CORE,0x03,0x23 \
$INTEL_FAM6_IVYBRIDGE_X,0x04,0x42a \
$INTEL_FAM6_HASWELL_X,0x02,0x3b \
$INTEL_FAM6_HASWELL_X,0x04,0x10 \
$INTEL_FAM6_HASWELL_CORE,0x03,0x23 \
$INTEL_FAM6_BROADWELL_XEON_D,0x02,0x14 \
$INTEL_FAM6_BROADWELL_XEON_D,0x03,0x7000011 \
$INTEL_FAM6_BROADWELL_GT3E,0x01,0x0000001B \
$INTEL_FAM6_BROADWELL_X,0x01,0x0b000025 \
$INTEL_FAM6_KABYLAKE_DESKTOP,0x09,0x80 \
$INTEL_FAM6_SKYLAKE_X,0x03,0x100013e \
$INTEL_FAM6_SKYLAKE_X,0x04,0x200003c
do
model=$(echo $tuple | cut -d, -f1)
stepping=$(( $(echo $tuple | cut -d, -f2) ))
ucode=$(echo $tuple | cut -d, -f3)
if [ "$cpu_model" = "$model" ] && [ "$cpu_stepping" = "$stepping" ] && echo "$cpu_ucode" | grep -qi "^$ucode$"; then
_debug "is_ucode_blacklisted: we have a match! ($model/$stepping/$ucode)"
bad_ucode_found="Intel CPU Family 6 Model $model Stepping $stepping with microcode $ucode"
return 0
fi
done
_debug "is_ucode_blacklisted: no ($model/$stepping/$ucode)"
return 1
}
# check for mode selection inconsistency
if [ "$opt_live_explicit" = 1 ]; then
if [ -n "$opt_kernel" -o -n "$opt_config" -o -n "$opt_map" ]; then
@ -1029,6 +1094,19 @@ check_cpu()
pstatus blue NO
fi
_info_nol " * CPU microcode is known to cause stability problems: "
if is_ucode_blacklisted; then
pstatus red YES "$bad_ucode_found"
_warn
_warn "The microcode your CPU is running on is known to cause instability problems,"
_warn "such as intempestive reboots or random crashes."
_warn "You are advised to either revert to a previous microcode version (that might not have"
_warn "the mitigations for Spectre), or upgrade to a newer one if available."
_warn
else
pstatus green NO
fi
_info "* CPU vulnerability to the three speculative execution attacks variants"
for v in 1 2 3; do
_info_nol " * Vulnerable to Variant $v: "