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spectre-meltdown-checker.sh
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#! /bin/sh
# SPDX-License-Identifier: GPL-3.0-only
# vim: set ts=4 sw=4 sts=4 noet:
#
# Spectre & Meltdown checker
#
# Check for the latest version at:
# https://github.com/speed47/spectre-meltdown-checker
# git clone https://github.com/speed47/spectre-meltdown-checker.git
# or wget https://meltdown.ovh -O spectre-meltdown-checker.sh
# or curl -L https://meltdown.ovh -o spectre-meltdown-checker.sh
#
# Stephane Lesimple
#
VERSION='0.46'
trap 'exit_cleanup' EXIT
trap '_warn "interrupted, cleaning up..."; exit_cleanup; exit 1' INT
exit_cleanup()
{
saved_ret=$?
# cleanup the temp decompressed config & kernel image
[ -n "${dumped_config:-}" ] && [ -f "$dumped_config" ] && rm -f "$dumped_config"
[ -n "${kerneltmp:-}" ] && [ -f "$kerneltmp" ] && rm -f "$kerneltmp"
[ -n "${kerneltmp2:-}" ] && [ -f "$kerneltmp2" ] && rm -f "$kerneltmp2"
[ -n "${mcedb_tmp:-}" ] && [ -f "$mcedb_tmp" ] && rm -f "$mcedb_tmp"
[ -n "${intel_tmp:-}" ] && [ -d "$intel_tmp" ] && rm -rf "$intel_tmp"
[ -n "${linuxfw_tmp:-}" ] && [ -f "$linuxfw_tmp" ] && rm -f "$linuxfw_tmp"
[ "${mounted_debugfs:-}" = 1 ] && umount /sys/kernel/debug 2>/dev/null
[ "${mounted_procfs:-}" = 1 ] && umount "$procfs" 2>/dev/null
[ "${insmod_cpuid:-}" = 1 ] && rmmod cpuid 2>/dev/null
[ "${insmod_msr:-}" = 1 ] && rmmod msr 2>/dev/null
[ "${kldload_cpuctl:-}" = 1 ] && kldunload cpuctl 2>/dev/null
[ "${kldload_vmm:-}" = 1 ] && kldunload vmm 2>/dev/null
exit $saved_ret
}
# if we were git clone'd, adjust VERSION
if [ -d "$(dirname "$0")/.git" ] && command -v git >/dev/null 2>&1; then
describe=$(git -C "$(dirname "$0")" describe --tags --dirty 2>/dev/null)
[ -n "$describe" ] && VERSION=$(echo "$describe" | sed -e s/^v//)
fi
show_usage()
{
# shellcheck disable=SC2086
cat <<EOF
Usage:
Live mode (auto): $(basename $0) [options]
Live mode (manual): $(basename $0) [options] <[--kernel <kimage>] [--config <kconfig>] [--map <mapfile>]> --live
Offline mode: $(basename $0) [options] <[--kernel <kimage>] [--config <kconfig>] [--map <mapfile>]>
Modes:
Two modes are available.
First mode is the "live" mode (default), it does its best to find information about the currently running kernel.
To run under this mode, just start the script without any option (you can also use --live explicitly)
Second mode is the "offline" mode, where you can inspect a non-running kernel.
This mode is automatically enabled when you specify the location of the kernel file, config and System.map files:
--kernel kernel_file specify a (possibly compressed) Linux or BSD kernel file
--config kernel_config specify a kernel config file (Linux only)
--map kernel_map_file specify a kernel System.map file (Linux only)
If you want to use live mode while specifying the location of the kernel, config or map file yourself,
you can add --live to the above options, to tell the script to run in live mode instead of the offline mode,
which is enabled by default when at least one file is specified on the command line.
Options:
--no-color don't use color codes
--verbose, -v increase verbosity level, possibly several times
--explain produce an additional human-readable explanation of actions to take to mitigate a vulnerability
--paranoid require IBPB to deem Variant 2 as mitigated
also require SMT disabled + unconditional L1D flush to deem Foreshadow-NG VMM as mitigated
also require SMT disabled to deem MDS vulnerabilities mitigated
--no-sysfs don't use the /sys interface even if present [Linux]
--sysfs-only only use the /sys interface, don't run our own checks [Linux]
--coreos special mode for CoreOS (use an ephemeral toolbox to inspect kernel) [Linux]
--arch-prefix PREFIX specify a prefix for cross-inspecting a kernel of a different arch, for example "aarch64-linux-gnu-",
so that invoked tools will be prefixed with this (i.e. aarch64-linux-gnu-objdump)
--batch text produce machine readable output, this is the default if --batch is specified alone
--batch short produce only one line with the vulnerabilities separated by spaces
--batch json produce JSON output formatted for Puppet, Ansible, Chef...
--batch nrpe produce machine readable output formatted for NRPE
--batch prometheus produce output for consumption by prometheus-node-exporter
--variant VARIANT specify which variant you'd like to check, by default all variants are checked.
can be used multiple times (e.g. --variant 3a --variant l1tf)
for a list of supported VARIANT parameters, use --variant help
--cve CVE specify which CVE you'd like to check, by default all supported CVEs are checked
can be used multiple times (e.g. --cve CVE-2017-5753 --cve CVE-2020-0543)
--hw-only only check for CPU information, don't check for any variant
--no-hw skip CPU information and checks, if you're inspecting a kernel not to be run on this host
--vmm [auto,yes,no] override the detection of the presence of a hypervisor, default: auto
--no-intel-db don't use the builtin Intel DB of affected processors
--allow-msr-write allow probing for write-only MSRs, this might produce kernel logs or be blocked by your system
--cpu [#,all] interact with CPUID and MSR of CPU core number #, or all (default: CPU core 0)
--update-fwdb update our local copy of the CPU microcodes versions database (using the awesome
MCExtractor project and the Intel firmwares GitHub repository)
--update-builtin-fwdb same as --update-fwdb but update builtin DB inside the script itself
--dump-mock-data used to mimick a CPU on an other system, mainly used to help debugging this script
Return codes:
0 (not vulnerable), 2 (vulnerable), 3 (unknown), 255 (error)
IMPORTANT:
A false sense of security is worse than no security at all.
Please use the --disclaimer option to understand exactly what this script does.
EOF
}
show_disclaimer()
{
cat <<EOF
Disclaimer:
This tool does its best to determine whether your system is immune (or has proper mitigations in place) for the
collectively named "transient execution" (aka "speculative execution") vulnerabilities that started to appear
since early 2018 with the infamous Spectre & Meltdown.
This tool does NOT attempt to run any kind of exploit, and can't 100% guarantee that your system is secure,
but rather helps you verifying whether your system has the known correct mitigations in place.
However, some mitigations could also exist in your kernel that this script doesn't know (yet) how to detect, or it might
falsely detect mitigations that in the end don't work as expected (for example, on backported or modified kernels).
Your system affectability to a given vulnerability depends on your CPU model and CPU microcode version, whereas the
mitigations in place depend on your CPU (model and microcode), your kernel version, and both the runtime configuration
of your CPU (through bits set through the MSRs) and your kernel. The script attempts to explain everything for each
vulnerability, so you know where your system stands. For a given vulnerability, detailed information is sometimes
available using the \`--explain\` switch.
Please also note that for the Spectre-like vulnerabilities, all software can possibly be exploited, in which case
this tool only verifies that the kernel (which is the core of the system) you're using has the proper protections
in place. Verifying all the other software is out of the scope of this tool, as it can't be done in a simple way.
As a general measure, ensure you always have the most up to date stable versions of all the software you use,
especially for those who are exposed to the world, such as network daemons and browsers.
For more information and answers to related questions, please refer to the FAQ.md file.
This tool has been released in the hope that it'll be useful, but don't use it to jump to conclusions about your security.
EOF
}
os=$(uname -s)
# parse options
opt_kernel=''
opt_config=''
opt_map=''
opt_live=-1
opt_no_color=0
opt_batch=0
opt_batch_format='text'
opt_verbose=1
opt_cve_list=''
opt_cve_all=1
opt_no_sysfs=0
opt_sysfs_only=0
opt_coreos=0
opt_arch_prefix=''
opt_hw_only=0
opt_no_hw=0
opt_vmm=-1
opt_allow_msr_write=0
opt_cpu=0
opt_explain=0
opt_paranoid=0
opt_mock=0
opt_intel_db=1
global_critical=0
global_unknown=0
nrpe_vuln=''
supported_cve_list='CVE-2017-5753 CVE-2017-5715 CVE-2017-5754 CVE-2018-3640 CVE-2018-3639 CVE-2018-3615 CVE-2018-3620 CVE-2018-3646 CVE-2018-12126 CVE-2018-12130 CVE-2018-12127 CVE-2019-11091 CVE-2019-11135 CVE-2018-12207 CVE-2020-0543 CVE-2023-20593 CVE-2022-40982'
# find a sane command to print colored messages, we prefer `printf` over `echo`
# because `printf` behavior is more standard across Linux/BSD
# we'll try to avoid using shell builtins that might not take options
echo_cmd_type='echo'
# ignore SC2230 here because `which` ignores builtins while `command -v` doesn't, and
# we don't want builtins here. Even if `which` is not installed, we'll fallback to the
# `echo` builtin anyway, so this is safe.
# shellcheck disable=SC2230
if command -v printf >/dev/null 2>&1; then
echo_cmd=$(command -v printf)
echo_cmd_type='printf'
elif which echo >/dev/null 2>&1; then
echo_cmd=$(which echo)
else
# maybe the `which` command is broken?
[ -x /bin/echo ] && echo_cmd=/bin/echo
# for Android
[ -x /system/bin/echo ] && echo_cmd=/system/bin/echo
fi
# still empty? fallback to builtin
[ -z "$echo_cmd" ] && echo_cmd='echo'
__echo()
{
opt="$1"
shift
_msg="$*"
if [ "$opt_no_color" = 1 ] ; then
# strip ANSI color codes
# some sed versions (i.e. toybox) can't seem to handle
# \033 aka \x1B correctly, so do it for them.
if [ "$echo_cmd_type" = printf ]; then
_interpret_chars=''
else
_interpret_chars='-e'
fi
_ctrlchar=$($echo_cmd $_interpret_chars "\033")
_msg=$($echo_cmd $_interpret_chars "$_msg" | sed -r "s/$_ctrlchar\[([0-9][0-9]?(;[0-9][0-9]?)?)?m//g")
fi
if [ "$echo_cmd_type" = printf ]; then
if [ "$opt" = "-n" ]; then
$echo_cmd "$_msg"
else
$echo_cmd "$_msg\n"
fi
else
# shellcheck disable=SC2086
$echo_cmd $opt -e "$_msg"
fi
}
_echo()
{
if [ "$opt_verbose" -ge "$1" ]; then
shift
__echo '' "$*"
fi
}
_echo_nol()
{
if [ "$opt_verbose" -ge "$1" ]; then
shift
__echo -n "$*"
fi
}
_warn()
{
_echo 0 "\033[31m$*\033[0m" >&2
}
_info()
{
_echo 1 "$*"
}
_info_nol()
{
_echo_nol 1 "$*"
}
_verbose()
{
_echo 2 "$*"
}
_verbose_nol()
{
_echo_nol 2 "$*"
}
_debug()
{
_echo 3 "\033[34m(debug) $*\033[0m"
}
explain()
{
if [ "$opt_explain" = 1 ] ; then
_info ''
_info "> \033[41m\033[30mHow to fix:\033[0m $*"
fi
}
cve2name()
{
case "$1" in
CVE-2017-5753) echo "Spectre Variant 1, bounds check bypass";;
CVE-2017-5715) echo "Spectre Variant 2, branch target injection";;
CVE-2017-5754) echo "Variant 3, Meltdown, rogue data cache load";;
CVE-2018-3640) echo "Variant 3a, rogue system register read";;
CVE-2018-3639) echo "Variant 4, speculative store bypass";;
CVE-2018-3615) echo "Foreshadow (SGX), L1 terminal fault";;
CVE-2018-3620) echo "Foreshadow-NG (OS), L1 terminal fault";;
CVE-2018-3646) echo "Foreshadow-NG (VMM), L1 terminal fault";;
CVE-2018-12126) echo "Fallout, microarchitectural store buffer data sampling (MSBDS)";;
CVE-2018-12130) echo "ZombieLoad, microarchitectural fill buffer data sampling (MFBDS)";;
CVE-2018-12127) echo "RIDL, microarchitectural load port data sampling (MLPDS)";;
CVE-2019-11091) echo "RIDL, microarchitectural data sampling uncacheable memory (MDSUM)";;
CVE-2019-11135) echo "ZombieLoad V2, TSX Asynchronous Abort (TAA)";;
CVE-2018-12207) echo "No eXcuses, iTLB Multihit, machine check exception on page size changes (MCEPSC)";;
CVE-2020-0543) echo "Special Register Buffer Data Sampling (SRBDS)";;
CVE-2023-20593) echo "Zenbleed, cross-process information leak";;
CVE-2022-40982) echo "Downfall, gather data sampling (GDS)";;
*) echo "$0: error: invalid CVE '$1' passed to cve2name()" >&2; exit 255;;
esac
}
is_cpu_affected_cached=0
_is_cpu_affected_cached()
{
# shellcheck disable=SC2086
case "$1" in
CVE-2017-5753) return $variant1;;
CVE-2017-5715) return $variant2;;
CVE-2017-5754) return $variant3;;
CVE-2018-3640) return $variant3a;;
CVE-2018-3639) return $variant4;;
CVE-2018-3615) return $variantl1tf_sgx;;
CVE-2018-3620) return $variantl1tf;;
CVE-2018-3646) return $variantl1tf;;
CVE-2018-12126) return $variant_msbds;;
CVE-2018-12130) return $variant_mfbds;;
CVE-2018-12127) return $variant_mlpds;;
CVE-2019-11091) return $variant_mdsum;;
CVE-2019-11135) return $variant_taa;;
CVE-2018-12207) return $variant_itlbmh;;
CVE-2020-0543) return $variant_srbds;;
CVE-2023-20593) return $variant_zenbleed;;
CVE-2022-40982) return $variant_downfall;;
*) echo "$0: error: invalid variant '$1' passed to is_cpu_affected()" >&2; exit 255;;
esac
}
is_cpu_affected()
{
# param: one of the $supported_cve_list items
# returns 0 if affected, 1 if not affected
# (note that in shell, a return of 0 is success)
# by default, everything is affected, we work in a "whitelist" logic here.
# usage: is_cpu_affected CVE-xxxx-yyyy && do something if affected
# if CPU is Intel and is in our dump of the Intel official affected CPUs page, use it:
if is_intel; then
cpuid_hex=$(printf "0x%08X" $(( cpu_cpuid )) )
if [ "${intel_line:-}" = "no" ]; then
_debug "is_cpu_affected: $cpuid_hex not in Intel database (cached)"
elif [ -z "$intel_line" ]; then
intel_line=$(read_inteldb | grep -F "$cpuid_hex," | head -n1)
if [ -z "$intel_line" ]; then
intel_line=no
_debug "is_cpu_affected: $cpuid_hex not in Intel database"
fi
fi
if [ "$intel_line" != "no" ]; then
_result=$(echo "$intel_line" | grep -Eo ,"$(echo "$1" | cut -c5-)"'=[^,]+' | cut -d= -f2)
_debug "is_cpu_affected: inteldb for $1 says '$_result'"
# handle special case for Foreshadow SGX (CVE-2018-3615):
# even if we are affected to L1TF (CVE-2018-3620/CVE-2018-3646), if there's no SGX on our CPU,
# then we're not affected to the original Foreshadow.
if [ "$1" = "CVE-2018-3615" ] && [ "$cpuid_sgx" = 0 ]; then
# not affected
return 1
fi
# /special case
if [ "$_result" = "N" ]; then
# not affected
return 1
elif [ -n "$_result" ]; then
# non-empty string != N means affected
return 0
fi
fi
fi
# Otherwise, do it ourselves
if [ "$is_cpu_affected_cached" = 1 ]; then
_is_cpu_affected_cached "$1"
return $?
fi
variant1=''
variant2=''
variant3=''
variant3a=''
variant4=''
variantl1tf=''
variant_msbds=''
variant_mfbds=''
variant_mlpds=''
variant_mdsum=''
variant_taa=''
variant_itlbmh=''
variant_srbds=''
# Zenbleed is AMD specific, look for "is_amd" below:
variant_zenbleed=immune
# Downfall is Intel specific, look for "is_intel" below:
variant_downfall=immune
if is_cpu_mds_free; then
[ -z "$variant_msbds" ] && variant_msbds=immune
[ -z "$variant_mfbds" ] && variant_mfbds=immune
[ -z "$variant_mlpds" ] && variant_mlpds=immune
[ -z "$variant_mdsum" ] && variant_mdsum=immune
_debug "is_cpu_affected: cpu not affected by Microarchitectural Data Sampling"
fi
if is_cpu_taa_free; then
[ -z "$variant_taa" ] && variant_taa=immune
_debug "is_cpu_affected: cpu not affected by TSX Asynhronous Abort"
fi
if is_cpu_srbds_free; then
[ -z "$variant_srbds" ] && variant_srbds=immune
_debug "is_cpu_affected: cpu not affected by Special Register Buffer Data Sampling"
fi
if is_cpu_specex_free; then
variant1=immune
variant2=immune
variant3=immune
variant3a=immune
variant4=immune
variantl1tf=immune
variant_msbds=immune
variant_mfbds=immune
variant_mlpds=immune
variant_mdsum=immune
variant_taa=immune
variant_srbds=immune
elif is_intel; then
# Intel
# https://github.com/crozone/SpectrePoC/issues/1 ^F E5200 => spectre 2 not affected
# https://github.com/paboldin/meltdown-exploit/issues/19 ^F E5200 => meltdown affected
# model name : Pentium(R) Dual-Core CPU E5200 @ 2.50GHz
if echo "$cpu_friendly_name" | grep -qE 'Pentium\(R\) Dual-Core[[:space:]]+CPU[[:space:]]+E[0-9]{4}K?'; then
variant1=vuln
[ -z "$variant2" ] && variant2=immune
variant3=vuln
fi
if [ "$capabilities_rdcl_no" = 1 ]; then
# capability bit for future Intel processor that will explicitly state
# that they're not affected to Meltdown
# this var is set in check_cpu()
[ -z "$variant3" ] && variant3=immune
[ -z "$variantl1tf" ] && variantl1tf=immune
_debug "is_cpu_affected: RDCL_NO is set so not vuln to meltdown nor l1tf"
fi
if [ "$capabilities_ssb_no" = 1 ]; then
# capability bit for future Intel processor that will explicitly state
# that they're not affected to Variant 4
# this var is set in check_cpu()
[ -z "$variant4" ] && variant4=immune
_debug "is_cpu_affected: SSB_NO is set so not vuln to variant4"
fi
if is_cpu_ssb_free; then
[ -z "$variant4" ] && variant4=immune
_debug "is_cpu_affected: cpu not affected by speculative store bypass so not vuln to variant4"
fi
# variant 3a
if [ "$cpu_family" = 6 ]; then
if [ "$cpu_model" = "$INTEL_FAM6_XEON_PHI_KNL" ] || [ "$cpu_model" = "$INTEL_FAM6_XEON_PHI_KNM" ]; then
_debug "is_cpu_affected: xeon phi immune to variant 3a"
[ -z "$variant3a" ] && variant3a=immune
elif [ "$cpu_model" = "$INTEL_FAM6_ATOM_SILVERMONT" ] || \
[ "$cpu_model" = "$INTEL_FAM6_ATOM_SILVERMONT_MID" ] || \
[ "$cpu_model" = "$INTEL_FAM6_ATOM_SILVERMONT_D" ]; then
# https://www.intel.com/content/www/us/en/security-center/advisory/intel-sa-00115.html
# https://github.com/speed47/spectre-meltdown-checker/issues/310
# => silvermont CPUs (aka cherry lake for tablets and brawsell for mobile/desktop) don't seem to be affected
# => goldmont ARE affected
_debug "is_cpu_affected: silvermont immune to variant 3a"
[ -z "$variant3a" ] && variant3a=immune
fi
fi
# L1TF (RDCL_NO already checked above)
if [ "$cpu_family" = 6 ]; then
if [ "$cpu_model" = "$INTEL_FAM6_ATOM_SALTWELL" ] || \
[ "$cpu_model" = "$INTEL_FAM6_ATOM_SALTWELL_TABLET" ] || \
[ "$cpu_model" = "$INTEL_FAM6_ATOM_SALTWELL_MID" ] || \
[ "$cpu_model" = "$INTEL_FAM6_ATOM_BONNELL" ] || \
[ "$cpu_model" = "$INTEL_FAM6_ATOM_BONNELL_MID" ] || \
[ "$cpu_model" = "$INTEL_FAM6_ATOM_SILVERMONT" ] || \
[ "$cpu_model" = "$INTEL_FAM6_ATOM_SILVERMONT_MID" ] || \
[ "$cpu_model" = "$INTEL_FAM6_ATOM_SILVERMONT_D" ] || \
[ "$cpu_model" = "$INTEL_FAM6_ATOM_AIRMONT" ] || \
[ "$cpu_model" = "$INTEL_FAM6_ATOM_AIRMONT_MID" ] || \
[ "$cpu_model" = "$INTEL_FAM6_ATOM_AIRMONT_NP" ] || \
[ "$cpu_model" = "$INTEL_FAM6_ATOM_GOLDMONT" ] || \
[ "$cpu_model" = "$INTEL_FAM6_ATOM_GOLDMONT_D" ] || \
[ "$cpu_model" = "$INTEL_FAM6_ATOM_GOLDMONT_PLUS" ] || \
[ "$cpu_model" = "$INTEL_FAM6_ATOM_TREMONT_D" ] || \
[ "$cpu_model" = "$INTEL_FAM6_XEON_PHI_KNL" ] || \
[ "$cpu_model" = "$INTEL_FAM6_XEON_PHI_KNM" ]; then
_debug "is_cpu_affected: intel family 6 but model known to be immune to l1tf"
[ -z "$variantl1tf" ] && variantl1tf=immune
else
_debug "is_cpu_affected: intel family 6 is vuln to l1tf"
variantl1tf=vuln
fi
elif [ "$cpu_family" -lt 6 ]; then
_debug "is_cpu_affected: intel family < 6 is immune to l1tf"
[ -z "$variantl1tf" ] && variantl1tf=immune
fi
# Downfall
if [ "$capabilities_gds_no" = 1 ]; then
# capability bit for future Intel processors that will explicitly state
# that they're unaffected by GDS. Also set by hypervisors on virtual CPUs
# so that the guest kernel doesn't try to mitigate GDS when it's already mitigated on the host
_debug "is_cpu_affected: downfall: not affected (GDS_NO)"
elif [ "$cpu_family" = 6 ]; then
# list from https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=64094e7e3118aff4b0be8ff713c242303e139834
set -u
if [ "$cpu_model" = "$INTEL_FAM6_SKYLAKE_X" ] || \
[ "$cpu_model" = "$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_TIGERLAKE_L" ] || \
[ "$cpu_model" = "$INTEL_FAM6_TIGERLAKE" ] || \
[ "$cpu_model" = "$INTEL_FAM6_ROCKETLAKE" ]; then
_debug "is_cpu_affected: downfall: affected"
variant_downfall=vuln
elif [ "$has_avx2" = 0 ] && [ "$has_avx512" = 0 ]; then
_debug "is_cpu_affected: downfall: no avx; immune"
else
# old Intel CPU (not in their DB), not listed as being affected by the Linux kernel,
# but with AVX2 or AVX512: unclear for now
_debug "is_cpu_affected: downfall: unclear, defaulting to non-affected for now"
fi
set +u
fi
elif is_amd || is_hygon; then
# AMD revised their statement about variant2 => affected
# https://www.amd.com/en/corporate/speculative-execution
variant1=vuln
variant2=vuln
[ -z "$variant3" ] && variant3=immune
# https://www.amd.com/en/corporate/security-updates
# "We have not identified any AMD x86 products susceptible to the Variant 3a vulnerability in our analysis to-date."
[ -z "$variant3a" ] && variant3a=immune
if is_cpu_ssb_free; then
[ -z "$variant4" ] && variant4=immune
_debug "is_cpu_affected: cpu not affected by speculative store bypass so not vuln to variant4"
fi
variantl1tf=immune
# Zenbleed
amd_legacy_erratum "$(amd_model_range 0x17 0x30 0x0 0x4f 0xf)" && variant_zenbleed=vuln
amd_legacy_erratum "$(amd_model_range 0x17 0x60 0x0 0x7f 0xf)" && variant_zenbleed=vuln
amd_legacy_erratum "$(amd_model_range 0x17 0xa0 0x0 0xaf 0xf)" && variant_zenbleed=vuln
elif [ "$cpu_vendor" = CAVIUM ]; then
variant3=immune
variant3a=immune
variantl1tf=immune
elif [ "$cpu_vendor" = PHYTIUM ]; then
variant3=immune
variant3a=immune
variantl1tf=immune
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
i=0
for cpupart in $cpu_part_list
do
i=$(( i + 1 ))
# do NOT quote $cpu_arch_list below
# shellcheck disable=SC2086
cpuarch=$(echo $cpu_arch_list | awk '{ print $'$i' }')
_debug "checking cpu$i: <$cpupart> <$cpuarch>"
# some kernels report AArch64 instead of 8
[ "$cpuarch" = "AArch64" ] && cpuarch=8
if [ -n "$cpupart" ] && [ -n "$cpuarch" ]; then
# 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 A8 A9 A12 A15 A17 A57 A72 A73 A75 A76 A77 Neoverse-N1 Neoverse-V1 Neoverse-N1 Neoverse-V2
# part ? ? c08 c09 c0d c0f c0e d07 d08 d09 d0a d0b d0d d0c d40 d49 d4f
# arch 7? 7? 7 7 7 7 7 8 8 8 8 8 8 8 8 8 8
#
# Whitelist identified non-affected processors, use vulnerability information from
# https://developer.arm.com/support/arm-security-updates/speculative-processor-vulnerability
# Partnumbers can be found here:
# https://github.com/gcc-mirror/gcc/blob/master/gcc/config/arm/arm-cpus.in
#
# Maintain cumulative check of vulnerabilities -
# if at least one of the cpu is affected, then the system is affected
if [ "$cpuarch" = 7 ] && echo "$cpupart" | grep -q -w -e 0xc08 -e 0xc09 -e 0xc0d -e 0xc0e; then
variant1=vuln
variant2=vuln
[ -z "$variant3" ] && variant3=immune
[ -z "$variant3a" ] && variant3a=immune
[ -z "$variant4" ] && variant4=immune
_debug "checking cpu$i: armv7 A8/A9/A12/A17 non affected to variants 3, 3a & 4"
elif [ "$cpuarch" = 7 ] && echo "$cpupart" | grep -q -w -e 0xc0f; then
variant1=vuln
variant2=vuln
[ -z "$variant3" ] && variant3=immune
variant3a=vuln
[ -z "$variant4" ] && variant4=immune
_debug "checking cpu$i: armv7 A15 non affected to variants 3 & 4"
elif [ "$cpuarch" = 8 ] && echo "$cpupart" | grep -q -w -e 0xd07 -e 0xd08; then
variant1=vuln
variant2=vuln
[ -z "$variant3" ] && variant3=immune
variant3a=vuln
variant4=vuln
_debug "checking cpu$i: armv8 A57/A72 non affected to variants 3"
elif [ "$cpuarch" = 8 ] && echo "$cpupart" | grep -q -w -e 0xd09; then
variant1=vuln
variant2=vuln
[ -z "$variant3" ] && variant3=immune
[ -z "$variant3a" ] && variant3a=immune
variant4=vuln
_debug "checking cpu$i: armv8 A73 non affected to variants 3 & 3a"
elif [ "$cpuarch" = 8 ] && echo "$cpupart" | grep -q -w -e 0xd0a; then
variant1=vuln
variant2=vuln
variant3=vuln
[ -z "$variant3a" ] && variant3a=immune
variant4=vuln
_debug "checking cpu$i: armv8 A75 non affected to variant 3a"
elif [ "$cpuarch" = 8 ] && echo "$cpupart" | grep -q -w -e 0xd0b -e 0xd0c -e 0xd0d; then
variant1=vuln
[ -z "$variant2" ] && variant2=immune
[ -z "$variant3" ] && variant3=immune
[ -z "$variant3a" ] && variant3a=immune
variant4=vuln
_debug "checking cpu$i: armv8 A76/A77/NeoverseN1 non affected to variant 2, 3 & 3a"
elif [ "$cpuarch" = 8 ] && echo "$cpupart" | grep -q -w -e 0xd40 -e 0xd49 -e 0xd4f; then
variant1=vuln
[ -z "$variant2" ] && variant2=immune
[ -z "$variant3" ] && variant3=immune
[ -z "$variant3a" ] && variant3a=immune
[ -z "$variant4" ] && variant4=immune
_debug "checking cpu$i: armv8 NeoverseN2/V1/V2 non affected to variant 2, 3, 3a & 4"
elif [ "$cpuarch" -le 7 ] || { [ "$cpuarch" = 8 ] && [ $(( cpupart )) -lt $(( 0xd07 )) ]; } ; then
[ -z "$variant1" ] && variant1=immune
[ -z "$variant2" ] && variant2=immune
[ -z "$variant3" ] && variant3=immune
[ -z "$variant3a" ] && variant3a=immune
[ -z "$variant4" ] && variant4=immune
_debug "checking cpu$i: arm arch$cpuarch, all immune (v7 or v8 and model < 0xd07)"
else
variant1=vuln
variant2=vuln
variant3=vuln
variant3a=vuln
variant4=vuln
_debug "checking cpu$i: arm unknown arch$cpuarch part$cpupart, considering vuln"
fi
fi
_debug "is_cpu_affected: for cpu$i and so far, we have <$variant1> <$variant2> <$variant3> <$variant3a> <$variant4>"
done
variantl1tf=immune
fi
# we handle iTLB Multihit here (not linked to is_specex_free)
if is_intel; then
# commit f9aa6b73a407b714c9aac44734eb4045c893c6f7
if [ "$cpu_family" = 6 ]; then
if [ "$cpu_model" = "$INTEL_FAM6_ATOM_SALTWELL" ] || \
[ "$cpu_model" = "$INTEL_FAM6_ATOM_SALTWELL_TABLET" ] || \
[ "$cpu_model" = "$INTEL_FAM6_ATOM_SALTWELL_MID" ] || \
[ "$cpu_model" = "$INTEL_FAM6_ATOM_BONNELL" ] || \
[ "$cpu_model" = "$INTEL_FAM6_ATOM_BONNELL_MID" ] || \
[ "$cpu_model" = "$INTEL_FAM6_ATOM_SILVERMONT" ] || \
[ "$cpu_model" = "$INTEL_FAM6_ATOM_SILVERMONT_D" ] || \
[ "$cpu_model" = "$INTEL_FAM6_ATOM_SILVERMONT_MID" ] || \
[ "$cpu_model" = "$INTEL_FAM6_ATOM_AIRMONT" ] || \
[ "$cpu_model" = "$INTEL_FAM6_XEON_PHI_KNL" ] || \
[ "$cpu_model" = "$INTEL_FAM6_XEON_PHI_KNM" ] || \
[ "$cpu_model" = "$INTEL_FAM6_ATOM_AIRMONT_MID" ] || \
[ "$cpu_model" = "$INTEL_FAM6_ATOM_GOLDMONT" ] || \
[ "$cpu_model" = "$INTEL_FAM6_ATOM_GOLDMONT_D" ] || \
[ "$cpu_model" = "$INTEL_FAM6_ATOM_GOLDMONT_PLUS" ]; then
_debug "is_cpu_affected: intel family 6 but model known to be immune to itlbmh"
[ -z "$variant_itlbmh" ] && variant_itlbmh=immune
else
_debug "is_cpu_affected: intel family 6 is vuln to itlbmh"
variant_itlbmh=vuln
fi
elif [ "$cpu_family" -lt 6 ]; then
_debug "is_cpu_affected: intel family < 6 is immune to itlbmh"
[ -z "$variant_itlbmh" ] && variant_itlbmh=immune
fi
else
_debug "is_cpu_affected: non-intel not affected to itlbmh"
[ -z "$variant_itlbmh" ] && variant_itlbmh=immune
fi
_debug "is_cpu_affected: temp results are <$variant1> <$variant2> <$variant3> <$variant3a> <$variant4> <$variantl1tf>"
[ "$variant1" = "immune" ] && variant1=1 || variant1=0
[ "$variant2" = "immune" ] && variant2=1 || variant2=0
[ "$variant3" = "immune" ] && variant3=1 || variant3=0
[ "$variant3a" = "immune" ] && variant3a=1 || variant3a=0
[ "$variant4" = "immune" ] && variant4=1 || variant4=0
[ "$variantl1tf" = "immune" ] && variantl1tf=1 || variantl1tf=0
[ "$variant_msbds" = "immune" ] && variant_msbds=1 || variant_msbds=0
[ "$variant_mfbds" = "immune" ] && variant_mfbds=1 || variant_mfbds=0
[ "$variant_mlpds" = "immune" ] && variant_mlpds=1 || variant_mlpds=0
[ "$variant_mdsum" = "immune" ] && variant_mdsum=1 || variant_mdsum=0
[ "$variant_taa" = "immune" ] && variant_taa=1 || variant_taa=0
[ "$variant_itlbmh" = "immune" ] && variant_itlbmh=1 || variant_itlbmh=0
[ "$variant_srbds" = "immune" ] && variant_srbds=1 || variant_srbds=0
[ "$variant_zenbleed" = "immune" ] && variant_zenbleed=1 || variant_zenbleed=0
[ "$variant_downfall" = "immune" ] && variant_downfall=1 || variant_downfall=0
variantl1tf_sgx="$variantl1tf"
# even if we are affected to L1TF, if there's no SGX, we're not affected to the original foreshadow
[ "$cpuid_sgx" = 0 ] && variantl1tf_sgx=1
_debug "is_cpu_affected: final results are <$variant1> <$variant2> <$variant3> <$variant3a> <$variant4> <$variantl1tf> <$variantl1tf_sgx>"
is_cpu_affected_cached=1
_is_cpu_affected_cached "$1"
return $?
}
is_cpu_specex_free()
{
# return true (0) if the CPU doesn't do speculative execution, false (1) if it does.
# if it's not in the list we know, return false (1).
# source: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/arch/x86/kernel/cpu/common.c#n882
# { X86_VENDOR_INTEL, 6, INTEL_FAM6_ATOM_SALTWELL, X86_FEATURE_ANY },
# { X86_VENDOR_INTEL, 6, INTEL_FAM6_ATOM_SALTWELL_TABLET, X86_FEATURE_ANY },
# { X86_VENDOR_INTEL, 6, INTEL_FAM6_ATOM_BONNELL_MID, X86_FEATURE_ANY },
# { X86_VENDOR_INTEL, 6, INTEL_FAM6_ATOM_SALTWELL_MID, X86_FEATURE_ANY },
# { X86_VENDOR_INTEL, 6, INTEL_FAM6_ATOM_BONNELL, X86_FEATURE_ANY },
# { X86_VENDOR_CENTAUR, 5 },
# { X86_VENDOR_INTEL, 5 },
# { X86_VENDOR_NSC, 5 },
# { X86_VENDOR_ANY, 4 },
parse_cpu_details
if is_intel; then
if [ "$cpu_family" = 6 ]; then
if [ "$cpu_model" = "$INTEL_FAM6_ATOM_SALTWELL" ] || \
[ "$cpu_model" = "$INTEL_FAM6_ATOM_SALTWELL_TABLET" ] || \
[ "$cpu_model" = "$INTEL_FAM6_ATOM_BONNELL_MID" ] || \
[ "$cpu_model" = "$INTEL_FAM6_ATOM_SALTWELL_MID" ] || \
[ "$cpu_model" = "$INTEL_FAM6_ATOM_BONNELL" ]; then
return 0
fi
elif [ "$cpu_family" = 5 ]; then
return 0
fi
fi
[ "$cpu_family" = 4 ] && return 0
return 1
}
is_cpu_mds_free()
{
# return true (0) if the CPU isn't affected by microarchitectural data sampling, false (1) if it does.
# if it's not in the list we know, return false (1).
# source: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/arch/x86/kernel/cpu/common.c
#VULNWL_INTEL(ATOM_GOLDMONT, NO_MDS | NO_L1TF),
#VULNWL_INTEL(ATOM_GOLDMONT_X, NO_MDS | NO_L1TF),
#VULNWL_INTEL(ATOM_GOLDMONT_PLUS, NO_MDS | NO_L1TF),
#/* AMD Family 0xf - 0x12 */
#VULNWL_AMD(0x0f, NO_MELTDOWN | NO_SSB | NO_L1TF | NO_MDS),
#VULNWL_AMD(0x10, NO_MELTDOWN | NO_SSB | NO_L1TF | NO_MDS),
#VULNWL_AMD(0x11, NO_MELTDOWN | NO_SSB | NO_L1TF | NO_MDS),
#VULNWL_AMD(0x12, NO_MELTDOWN | NO_SSB | NO_L1TF | NO_MDS),
#/* FAMILY_ANY must be last, otherwise 0x0f - 0x12 matches won't work */
#VULNWL_AMD(X86_FAMILY_ANY, NO_MELTDOWN | NO_L1TF | NO_MDS),
#VULNWL_HYGON(X86_FAMILY_ANY, NO_MELTDOWN | NO_L1TF | NO_MDS),
parse_cpu_details
if is_intel; then
if [ "$cpu_family" = 6 ]; then
if [ "$cpu_model" = "$INTEL_FAM6_ATOM_GOLDMONT" ] || \
[ "$cpu_model" = "$INTEL_FAM6_ATOM_GOLDMONT_D" ] || \
[ "$cpu_model" = "$INTEL_FAM6_ATOM_GOLDMONT_PLUS" ]; then
return 0
fi
fi
[ "$capabilities_mds_no" = 1 ] && return 0
fi
# official statement from AMD says none of their CPUs are affected
# https://www.amd.com/en/corporate/product-security
# https://www.amd.com/system/files/documents/security-whitepaper.pdf
if is_amd; then
return 0
elif is_hygon; then
return 0
elif [ "$cpu_vendor" = CAVIUM ]; then
return 0
elif [ "$cpu_vendor" = PHYTIUM ]; then
return 0
elif [ "$cpu_vendor" = ARM ]; then
return 0
fi
return 1
}
is_cpu_taa_free()
{
# return true (0) if the CPU isn't affected by tsx asynchronous aborts, false (1) if it does.
# There are three types of processors that do not require additional mitigations.
# 1. CPUs that do not support Intel TSX are not affected.
# 2. CPUs that enumerate IA32_ARCH_CAPABILITIES[TAA_NO] (bit 8)=1 are not affected.
# 3. CPUs that support Intel TSX and do not enumerate IA32_ARCH_CAPABILITIES[MDS_NO] (bit 5)=1
# do not need additional mitigations beyond what is already required to mitigate MDS.
if ! is_intel; then
return 0
# is intel
elif [ "$capabilities_taa_no" = 1 ] || [ "$cpuid_rtm" = 0 ]; then
return 0
fi
return 1
}
is_cpu_srbds_free()
{
# return zero (0) if the CPU isn't affected by special register buffer data sampling, one (1) if it is.
# If it's not in the list we know, return one (1).
# source: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/arch/x86/kernel/cpu/common.c
#
# A processor is affected by SRBDS if its Family_Model and stepping is in the
# following list, with the exception of the listed processors
# exporting MDS_NO while Intel TSX is available yet not enabled. The
# latter class of processors are only affected when Intel TSX is enabled
# by software using TSX_CTRL_MSR otherwise they are not affected.
#
# ============= ============ ========
# common name Family_Model Stepping
# ============= ============ ========
# IvyBridge 06_3AH All (INTEL_FAM6_IVYBRIDGE)
#
# Haswell 06_3CH All (INTEL_FAM6_HASWELL)
# Haswell_L 06_45H All (INTEL_FAM6_HASWELL_L)
# Haswell_G 06_46H All (INTEL_FAM6_HASWELL_G)
#
# Broadwell_G 06_47H All (INTEL_FAM6_BROADWELL_G)
# Broadwell 06_3DH All (INTEL_FAM6_BROADWELL)
#
# Skylake_L 06_4EH All (INTEL_FAM6_SKYLAKE_L)
# Skylake 06_5EH All (INTEL_FAM6_SKYLAKE)
#
# Kabylake_L 06_8EH <=0xC (MDS_NO) (INTEL_FAM6_KABYLAKE_L)
#
# Kabylake 06_9EH <=0xD (MDS_NO) (INTEL_FAM6_KABYLAKE)
# ============= ============ ========
parse_cpu_details
if is_intel; then
if [ "$cpu_family" = 6 ]; then
if [ "$cpu_model" = "$INTEL_FAM6_IVYBRIDGE" ] || \
[ "$cpu_model" = "$INTEL_FAM6_HASWELL" ] || \
[ "$cpu_model" = "$INTEL_FAM6_HASWELL_L" ] || \
[ "$cpu_model" = "$INTEL_FAM6_HASWELL_G" ] || \
[ "$cpu_model" = "$INTEL_FAM6_BROADWELL_G" ] || \
[ "$cpu_model" = "$INTEL_FAM6_BROADWELL" ] || \
[ "$cpu_model" = "$INTEL_FAM6_SKYLAKE_L" ] || \
[ "$cpu_model" = "$INTEL_FAM6_SKYLAKE" ]; then
return 1
elif [ "$cpu_model" = "$INTEL_FAM6_KABYLAKE_L" ] && [ "$cpu_stepping" -le 12 ] || \
[ "$cpu_model" = "$INTEL_FAM6_KABYLAKE" ] && [ "$cpu_stepping" -le 13 ]; then
if [ "$capabilities_mds_no" -eq 1 ] && { [ "$cpuid_rtm" -eq 0 ] || [ "$tsx_ctrl_msr_rtm_disable" -eq 1 ] ;} ; then
return 0
else
return 1
fi
fi
fi
fi
return 0
}
is_cpu_ssb_free()
{
# return true (0) if the CPU isn't affected by speculative store bypass, false (1) if it does.
# if it's not in the list we know, return false (1).
# source1: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/arch/x86/kernel/cpu/common.c#n945
# source2: https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git/tree/arch/x86/kernel/cpu/common.c
# Only list CPUs that speculate but are immune, to avoid duplication of cpus listed in is_cpu_specex_free()
#{ X86_VENDOR_INTEL, 6, INTEL_FAM6_ATOM_SILVERMONT },
#{ X86_VENDOR_INTEL, 6, INTEL_FAM6_ATOM_AIRMONT },
#{ X86_VENDOR_INTEL, 6, INTEL_FAM6_ATOM_SILVERMONT_X },
#{ X86_VENDOR_INTEL, 6, INTEL_FAM6_ATOM_SILVERMONT_MID },
#{ X86_VENDOR_INTEL, 6, INTEL_FAM6_CORE_YONAH },
#{ X86_VENDOR_INTEL, 6, INTEL_FAM6_XEON_PHI_KNL },
#{ X86_VENDOR_INTEL, 6, INTEL_FAM6_XEON_PHI_KNM },
#{ X86_VENDOR_AMD, 0x12, },
#{ X86_VENDOR_AMD, 0x11, },
#{ X86_VENDOR_AMD, 0x10, },
#{ X86_VENDOR_AMD, 0xf, },
parse_cpu_details
if is_intel; then
if [ "$cpu_family" = 6 ]; then
if [ "$cpu_model" = "$INTEL_FAM6_ATOM_AIRMONT" ] || \
[ "$cpu_model" = "$INTEL_FAM6_ATOM_SILVERMONT" ] || \
[ "$cpu_model" = "$INTEL_FAM6_ATOM_SILVERMONT_D" ] || \
[ "$cpu_model" = "$INTEL_FAM6_ATOM_SILVERMONT_MID" ]; then
return 0
elif [ "$cpu_model" = "$INTEL_FAM6_CORE_YONAH" ] || \
[ "$cpu_model" = "$INTEL_FAM6_XEON_PHI_KNL" ] || \
[ "$cpu_model" = "$INTEL_FAM6_XEON_PHI_KNM" ]; then
return 0
fi
fi
fi
if is_amd; then
if [ "$cpu_family" = "18" ] || \
[ "$cpu_family" = "17" ] || \
[ "$cpu_family" = "16" ] || \
[ "$cpu_family" = "15" ]; then
return 0
fi
fi
if is_hygon; then
return 1
fi
[ "$cpu_family" = 4 ] && return 0
return 1
}
show_header()
{
_info "Spectre and Meltdown mitigation detection tool v$VERSION"
_info
}
# Family-Model-Stepping to CPUID
# prints CPUID in base-10 to stdout
fms2cpuid()
{
_family="$1"
_model="$2"
_stepping="$3"
if [ "$(( _family ))" -le 15 ]; then
_extfamily=0
_lowfamily=$(( _family ))
else
# when we have a family > 0xF, then lowfamily is stuck at 0xF
# and extfamily is ADDED to it (as in "+"), to ensure old software
# never sees a lowfamily < 0xF for newer families
_lowfamily=15
_extfamily=$(( (_family) - 15 ))
fi
_extmodel=$(( (_model & 0xF0 ) >> 4 ))
_lowmodel=$(( (_model & 0x0F ) >> 0 ))
echo $(( (_stepping & 0x0F) | (_lowmodel << 4) | (_lowfamily << 8) | (_extmodel << 16) | (_extfamily << 20) ))
}
download_file()
{
_url="$1"
_file="$2"
if command -v wget >/dev/null 2>&1; then
wget -q "$_url" -O "$_file"; ret=$?
elif command -v curl >/dev/null 2>&1; then
curl -sL "$_url" -o "$_file"; ret=$?
elif command -v fetch >/dev/null 2>&1; then
fetch -q "$_url" -o "$_file"; ret=$?
else
echo ERROR "please install one of \`wget\`, \`curl\` of \`fetch\` programs"
unset _file _url
return 1
fi
unset _file _url
if [ "$ret" != 0 ]; then
echo ERROR "error $ret"
return $ret
fi
echo DONE
}
[ -z "$HOME" ] && HOME="$(getent passwd "$(whoami)" | cut -d: -f6)"
mcedb_cache="$HOME/.mcedb"
update_fwdb()
{
show_header
set -e
if [ -r "$mcedb_cache" ]; then
previous_dbversion=$(awk '/^# %%% MCEDB / { print $4 }' "$mcedb_cache")
fi
# first, download the MCE.db from the excellent platomav's MCExtractor project