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refacto: move cpu discovery bits to a dedicated function

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Stéphane Lesimple 2018-01-31 13:00:58 +01:00
parent aa18b51e1c
commit 71e7109c22
1 changed files with 94 additions and 35 deletions
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129
spectre-meltdown-checker.sh
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@ -203,12 +203,8 @@ is_cpu_vulnerable()
variant1=''
variant2=''
variant3=''
# we also set a friendly name for the CPU to be used in the script if needed
cpu_friendly_name=$(grep '^model name' /proc/cpuinfo | cut -d: -f2- | head -1 | sed -e 's/^ *//')
# variant 0 is just for us to fill the cpu_friendly_name var
[ "$1" = 0 ] && return 0
if grep -q GenuineIntel /proc/cpuinfo; then
if [ "$cpu_vendor" = GenuineIntel ]; then
# Intel
# Old Atoms are not vulnerable to spectre 2 nor meltdown
# https://security-center.intel.com/advisory.aspx?intelid=INTEL-SA-00088&languageid=en-fr
@ -234,21 +230,19 @@ is_cpu_vulnerable()
variant3=immune
_debug "is_cpu_vulnerable: RDCL_NO is set so not vuln to meltdown"
fi
elif grep -q AuthenticAMD /proc/cpuinfo; then
elif [ "$cpu_vendor" = AuthenticAMD ]; then
# AMD revised their statement about variant2 => vulnerable
# https://www.amd.com/en/corporate/speculative-execution
variant1=vuln
variant2=vuln
[ -z "$variant3" ] && variant3=immune
elif grep -qi 'CPU implementer[[:space:]]*:[[:space:]]*0x41' /proc/cpuinfo; then
elif [ "$cpu_vendor" = ARM ]; then
# ARM
# reference: https://developer.arm.com/support/security-update
# some devices (phones or other) have several ARMs and as such different part numbers,
# an example is "bigLITTLE". we shouldn't rely on the first CPU only, so we check the whole list
cpupart_list=$(awk '/CPU part/ {print $4}' /proc/cpuinfo)
cpuarch_list=$(awk '/CPU architecture/ {print $3}' /proc/cpuinfo)
i=0
for cpupart in $cpupart_list
for cpupart in $cpu_part_list
do
i=$(( i + 1 ))
cpuarch=$(echo "$cpuarch_list" | awk '{ print $'$i' }')
@ -256,7 +250,6 @@ is_cpu_vulnerable()
# some kernels report AArch64 instead of 8
[ "$cpuarch" = "AArch64" ] && cpuarch=8
if [ -n "$cpupart" ] && [ -n "$cpuarch" ]; then
cpu_friendly_name="ARM v$cpuarch model $cpupart"
# Cortex-R7 and Cortex-R8 are real-time and only used in medical devices or such
# I can't find their CPU part number, but it's probably not that useful anyway
# model R7 R8 A9 A15 A17 A57 A72 A73 A75
@ -639,34 +632,101 @@ is_coreos()
return 1
}
parse_cpu_details()
{
cpu_vendor=$( 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
if grep -qi 'CPU implementer[[:space:]]*:[[:space:]]*0x41' /proc/cpuinfo; then
cpu_vendor='ARM'
# some devices (phones or other) have several ARMs and as such different part numbers,
# an example is "bigLITTLE", so we need to store the whole list, this is needed for is_cpu_vulnerable
cpu_part_list=$(awk '/CPU part/ {print $4}' /proc/cpuinfo)
cpu_arch_list=$(awk '/CPU architecture/ {print $3}' /proc/cpuinfo)
# take the first one to fill the friendly name
cpu_arch=$(echo "$cpu_arch_list" | awk '{ print $1 }')
cpu_part=$(echo "$cpu_part_list" | awk '{ print $1 }')
[ "$cpu_arch" = "AArch64" ] && cpu_arch=8
cpu_friendly_name="ARM"
[ -n "$cpu_arch" ] && cpu_friendly_name="$cpu_friendly_name v$cpu_arch"
[ -n "$cpu_part" ] && cpu_friendly_name="$cpu_friendly_name model $cpu_part"
fi
cpu_family=$( grep '^cpu family' /proc/cpuinfo | awk '{print $4}' | grep -E '^[0-9]+$' | head -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 $3}' | head -1)
cpu_friendly_name=$(grep '^model name' /proc/cpuinfo | cut -d: -f2- | head -1 | sed -e 's/^ *//')
# also define those that we will need in other funcs
# taken from ttps://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/arch/x86/include/asm/intel-family.h
INTEL_FAM6_CORE_YONAH=$(( 0x0E ))
INTEL_FAM6_CORE2_MEROM=$(( 0x0F ))
INTEL_FAM6_CORE2_MEROM_L=$(( 0x16 ))
INTEL_FAM6_CORE2_PENRYN=$(( 0x17 ))
INTEL_FAM6_CORE2_DUNNINGTON=$(( 0x1D ))
INTEL_FAM6_NEHALEM=$(( 0x1E ))
INTEL_FAM6_NEHALEM_G=$(( 0x1F ))
INTEL_FAM6_NEHALEM_EP=$(( 0x1A ))
INTEL_FAM6_NEHALEM_EX=$(( 0x2E ))
INTEL_FAM6_WESTMERE=$(( 0x25 ))
INTEL_FAM6_WESTMERE_EP=$(( 0x2C ))
INTEL_FAM6_WESTMERE_EX=$(( 0x2F ))
INTEL_FAM6_SANDYBRIDGE=$(( 0x2A ))
INTEL_FAM6_SANDYBRIDGE_X=$(( 0x2D ))
INTEL_FAM6_IVYBRIDGE=$(( 0x3A ))
INTEL_FAM6_IVYBRIDGE_X=$(( 0x3E ))
INTEL_FAM6_HASWELL_CORE=$(( 0x3C ))
INTEL_FAM6_HASWELL_X=$(( 0x3F ))
INTEL_FAM6_HASWELL_ULT=$(( 0x45 ))
INTEL_FAM6_HASWELL_GT3E=$(( 0x46 ))
INTEL_FAM6_BROADWELL_CORE=$(( 0x3D ))
INTEL_FAM6_BROADWELL_GT3E=$(( 0x47 ))
INTEL_FAM6_BROADWELL_X=$(( 0x4F ))
INTEL_FAM6_BROADWELL_XEON_D=$(( 0x56 ))
INTEL_FAM6_SKYLAKE_MOBILE=$(( 0x4E ))
INTEL_FAM6_SKYLAKE_DESKTOP=$(( 0x5E ))
INTEL_FAM6_SKYLAKE_X=$(( 0x55 ))
INTEL_FAM6_KABYLAKE_MOBILE=$(( 0x8E ))
INTEL_FAM6_KABYLAKE_DESKTOP=$(( 0x9E ))
# /* "Small Core" Processors (Atom) */
INTEL_FAM6_ATOM_PINEVIEW=$(( 0x1C ))
INTEL_FAM6_ATOM_LINCROFT=$(( 0x26 ))
INTEL_FAM6_ATOM_PENWELL=$(( 0x27 ))
INTEL_FAM6_ATOM_CLOVERVIEW=$(( 0x35 ))
INTEL_FAM6_ATOM_CEDARVIEW=$(( 0x36 ))
INTEL_FAM6_ATOM_SILVERMONT1=$(( 0x37 ))
INTEL_FAM6_ATOM_SILVERMONT2=$(( 0x4D ))
INTEL_FAM6_ATOM_AIRMONT=$(( 0x4C ))
INTEL_FAM6_ATOM_MERRIFIELD=$(( 0x4A ))
INTEL_FAM6_ATOM_MOOREFIELD=$(( 0x5A ))
INTEL_FAM6_ATOM_GOLDMONT=$(( 0x5C ))
INTEL_FAM6_ATOM_DENVERTON=$(( 0x5F ))
INTEL_FAM6_ATOM_GEMINI_LAKE=$(( 0x7A ))
# /* Xeon Phi */
INTEL_FAM6_XEON_PHI_KNL=$(( 0x57 ))
INTEL_FAM6_XEON_PHI_KNM=$(( 0x85 ))
}
is_ucode_blacklisted()
{
# if it's not an Intel, don't bother: it's not blacklisted
grep -q GenuineIntel /proc/cpuinfo || return 1
[ "$cpu_vendor" = GenuineIntel ] || return 1
# it also needs to be family=6
grep -qE '^cpu family.+ 6$' /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 $3}' | head -1)
[ "$cpu_family" = 6 ] || return 1
# now, check each known bad microcode
# source: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/arch/x86/kernel/cpu/intel.c#n105
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
INTEL_FAM6_ATOM_GEMINI_LAKE=122
INTEL_FAM6_SANDYBRIDGE_X=45
# model,stepping,microcode
set -u
for tuple in \
@ -743,6 +803,7 @@ fi
# root check (only for live mode, for offline mode, we already checked if we could read the files)
parse_cpu_details
if [ "$opt_live" = 1 ]; then
if [ "$(id -u)" -ne 0 ]; then
_warn "Note that you should launch this script with root privileges to get accurate information."
@ -752,8 +813,6 @@ if [ "$opt_live" = 1 ]; then
fi
_info "Checking for vulnerabilities on current system"
_info "Kernel is \033[35m$(uname -s) $(uname -r) $(uname -v) $(uname -m)\033[0m"
# call is_cpu_vulnerable to fill the cpu_friendly_name var
is_cpu_vulnerable 0
_info "CPU is \033[35m$cpu_friendly_name\033[0m"
# try to find the image of the current running kernel