peter/spectre-meltdown-checker
peter/spectre-meltdown-checker
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enh: lazy loading of cpu informations

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This commit is contained in:
Stéphane Lesimple 2018-02-02 11:10:36 +01:00
parent 07afd95b63
commit 3d765bc703
1 changed files with 9 additions and 18 deletions
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27
spectre-meltdown-checker.sh
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@ -323,7 +323,7 @@ is_cpu_specex_free()
# { X86_VENDOR_INTEL, 5 },
# { X86_VENDOR_NSC, 5 },
# { X86_VENDOR_ANY, 4 },
set -u
parse_cpu_details
if [ "$cpu_vendor" = GenuineIntel ]; then
if [ "$cpu_family" = 6 ]; then
if [ "$cpu_model" = "$INTEL_FAM6_ATOM_CEDARVIEW" ] || \
@ -331,15 +331,12 @@ is_cpu_specex_free()
[ "$cpu_model" = "$INTEL_FAM6_ATOM_LINCROFT" ] || \
[ "$cpu_model" = "$INTEL_FAM6_ATOM_PENWELL" ] || \
[ "$cpu_model" = "$INTEL_FAM6_ATOM_PINEVIEW" ]; then
set +u
return 0
fi
elif [ "$cpu_family" = 5 ]; then
set +u
return 0
fi
fi
set +u
[ "$cpu_family" -eq 4 ] && return 0
return 1
}
@ -683,6 +680,7 @@ is_coreos()
parse_cpu_details()
{
[ "$parse_cpu_details_done" = 1 ] && return 0
cpu_vendor=$( grep '^vendor_id' /proc/cpuinfo | awk '{print $3}' | head -1)
cpu_friendly_name=$(grep '^model name' /proc/cpuinfo | cut -d: -f2- | head -1 | sed -e 's/^ *//')
# special case for ARM follows
@ -770,10 +768,12 @@ parse_cpu_details()
INTEL_FAM6_XEON_PHI_KNL=$(( 0x57 ))
INTEL_FAM6_XEON_PHI_KNM=$(( 0x85 ))
}
parse_cpu_details_done=1
}
is_ucode_blacklisted()
{
parse_cpu_details
# if it's not an Intel, don't bother: it's not blacklisted
[ "$cpu_vendor" = GenuineIntel ] || return 1
# it also needs to be family=6
@ -782,7 +782,6 @@ is_ucode_blacklisted()
# source: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/arch/x86/kernel/cpu/intel.c#n105
# model,stepping,microcode
ucode_found="model $cpu_model stepping $cpu_stepping ucode $cpu_ucode"
set -u
for tuple in \
$INTEL_FAM6_KABYLAKE_DESKTOP,0x0B,0x84 \
$INTEL_FAM6_KABYLAKE_DESKTOP,0x0A,0x84 \
@ -813,11 +812,9 @@ is_ucode_blacklisted()
ucode=$(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! ($cpu_model/$cpu_stepping/$cpu_ucode)"
set +u
return 0
fi
done
set +u
_debug "is_ucode_blacklisted: no ($cpu_model/$cpu_stepping/$cpu_ucode)"
return 1
}
@ -851,10 +848,9 @@ else
fi
fi
# root check (only for live mode, for offline mode, we already checked if we could read the files)
parse_cpu_details
if [ "$opt_live" = 1 ]; then
# root check (only for live mode, for offline mode, we already checked if we could read the files)
if [ "$(id -u)" -ne 0 ]; then
_warn "Note that you should launch this script with root privileges to get accurate information."
_warn "We'll proceed but you might see permission denied errors."
@ -920,6 +916,7 @@ if [ "$opt_live" = 1 ]; then
fi
else
_info "Checking for vulnerabilities against specified kernel"
_info "CPU is \033[35m$cpu_friendly_name\033[0m"
fi
if [ -n "$opt_kernel" ]; then
@ -1405,9 +1402,7 @@ check_variant2()
;;
0)
pstatus red NO
if [ "$opt_verbose" -ge 2 ]; then
_info " - To enable, \`echo 1 > $ibrs_knob_dir/ibrs_enabled' as root. If you don't have hardware support, you'll get an error."
fi
_verbose " - To enable, \`echo 1 > $ibrs_knob_dir/ibrs_enabled' as root. If you don't have hardware support, you'll get an error."
;;
1 | 2) pstatus green YES;;
*) pstatus yellow UNKNOWN;;
@ -1433,9 +1428,7 @@ check_variant2()
;;
0 | 1)
pstatus red NO
if [ "$opt_verbose" -ge 2 ]; then
_info " - To enable, \`echo 2 > $ibrs_knob_dir/ibrs_enabled' as root. If you don't have hardware support, you'll get an error."
fi
_verbose " - To enable, \`echo 2 > $ibrs_knob_dir/ibrs_enabled' as root. If you don't have hardware support, you'll get an error."
;;
2) pstatus green YES;;
*) pstatus yellow UNKNOWN;;
@ -1457,9 +1450,7 @@ check_variant2()
;;
0)
pstatus red NO
if [ "$opt_verbose" -ge 2 ]; then
_info " - To enable, \`echo 1 > $ibrs_knob_dir/ibpb_enabled' as root. If you don't have hardware support, you'll get an error."
fi
_verbose " - To enable, \`echo 1 > $ibrs_knob_dir/ibpb_enabled' as root. If you don't have hardware support, you'll get an error."
;;
1) pstatus green YES;;
2) pstatus green YES "IBPB used instead of IBRS in all kernel entrypoints";;