spectre-meltdown-checker/spectre-meltdown-checker.sh

#! /bin/sh
# 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='0.37+'

trap 'exit_cleanup' EXIT
trap '_warn "interrupted, cleaning up..."; exit_cleanup; exit 1' INT
exit_cleanup()
{
	# 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 "$kerneltmp2"
	[ "$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
}

show_usage()
{
	# shellcheck disable=SC2086
	cat <<EOF
	Usage:
		Live mode:    $(basename $0) [options] [--live]
		Offline mode: $(basename $0) [options] [--kernel <kernel_file>] [--config <kernel_config>] [--map <kernel_map_file>]

	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.
		You'll need to 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)

	Options:
		--no-color		don't use color codes
		--verbose, -v		increase verbosity level, possibly several times
		--no-explain		don't produce a human-readable explanation of actions to take to mitigate a vulnerability
		--paranoid		require IBPB to deem Variant 2 as 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 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 [1,2,3,3a,4]	specify which variant you'd like to check, by default all variants are checked,
					can be specified multiple times (e.g. --variant 2 --variant 3)
		--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

	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 "speculative execution" vulnerabilities. It doesn't attempt to run any kind of exploit, and can't 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 exposure also depends on your CPU. As of now, AMD and ARM processors are marked as immune to some or all of these
vulnerabilities (except some specific ARM models). All Intel processors manufactured since circa 1995 are thought to be vulnerable,
except some specific/old models, such as some early Atoms. Whatever processor one uses, one might seek more information
from the manufacturer of that processor and/or of the device in which it runs.

The nature of the discovered vulnerabilities being quite new, the landscape of vulnerable processors can be expected
to change over time, which is why this script makes the assumption that all CPUs are vulnerable, except if the manufacturer
explicitly stated otherwise in a verifiable public announcement.

Please also note that for Spectre vulnerabilities, all software can possibly be exploited, 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 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.

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_explicit=0
opt_live=1
opt_no_color=0
opt_batch=0
opt_batch_format="text"
opt_verbose=1
opt_variant1=0
opt_variant2=0
opt_variant3=0
opt_allvariants=1
opt_no_sysfs=0
opt_sysfs_only=0
opt_coreos=0
opt_arch_prefix=''
opt_hw_only=0
opt_no_hw=0
opt_no_explain=0
opt_paranoid=0

global_critical=0
global_unknown=0
nrpe_vuln=""

# 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
if which printf >/dev/null 2>&1; then
	echo_cmd=$(which printf)
	echo_cmd_type=printf
elif which echo >/dev/null 2>&1; then
	echo_cmd=$(which echo)
else
	# 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_no_explain" != 1 ] ; then
		_info ''
		_info "> \033[41m\033[30mHow to fix:\033[0m $*"
	fi
}

is_cpu_vulnerable_cached=0
_is_cpu_vulnerable_cached()
{
	# shellcheck disable=SC2086
	[ "$1" = 1  ] && return $variant1
	# shellcheck disable=SC2086
	[ "$1" = 2  ] && return $variant2
	# shellcheck disable=SC2086
	[ "$1" = 3  ] && return $variant3
	# shellcheck disable=SC2086
	[ "$1" = 3a ] && return $variant3a
	# shellcheck disable=SC2086
	[ "$1" = 4  ] && return $variant4
	echo "$0: error: invalid variant '$1' passed to is_cpu_vulnerable()" >&2
	exit 255
}

is_cpu_vulnerable()
{
	# param: 1, 2, 3, 3a or 4 (variant)
	# returns 0 if vulnerable, 1 if not vulnerable
	# (note that in shell, a return of 0 is success)
	# by default, everything is vulnerable, we work in a "whitelist" logic here.
	# usage: is_cpu_vulnerable 2 && do something if vulnerable
	if [ "$is_cpu_vulnerable_cached" = 1 ]; then
		_is_cpu_vulnerable_cached "$1"
		return $?
	fi

	variant1=''
	variant2=''
	variant3=''
	variant3a=''
	variant4=''

	if is_cpu_specex_free; then
		variant1=immune
		variant2=immune
		variant3=immune
		variant3a=immune
		variant4=immune
	elif is_intel; then
		# Intel
		# https://github.com/crozone/SpectrePoC/issues/1 ^F E5200 => spectre 2 not vulnerable
		# https://github.com/paboldin/meltdown-exploit/issues/19 ^F E5200 => meltdown vulnerable
		# model name : Pentium(R) Dual-Core  CPU      E5200  @ 2.50GHz
		if grep -qE '^model name.+ Pentium\(R\) Dual-Core[[:space:]]+CPU[[:space:]]+E[0-9]{4}K? ' "$procfs/cpuinfo"; then
			variant1=vuln
			[ -z "$variant2" ] && variant2=immune
			variant3=vuln
		fi
		if [ "$capabilities_rdcl_no" = 1 ]; then
			# capability bit for future Intel processor that will explicitly state
			# that they're not vulnerable to Meltdown
			# this var is set in check_cpu()
			variant3=immune
			_debug "is_cpu_vulnerable: RDCL_NO is set so not vuln to meltdown"
		fi
		if [ "$capabilities_ssb_no" = 1 ]; then
			# capability bit for future Intel processor that will explicitly state
			# that they're not vulnerable to Variant 4
			# this var is set in check_cpu()
			variant4=immune
			_debug "is_cpu_vulnerable: SSB_NO is set so not vuln to variant4"
		fi
	elif is_amd; then
		# AMD revised their statement about variant2 => vulnerable
		# 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
	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 A9    A15   A17   A57   A72    A73    A75
				# part   ?  ? 0xc09 0xc0f 0xc0e 0xd07 0xd08  0xd09  0xd0a
				# arch  7? 7? 7     7     7     8     8      8      8
				#
				# variant 1 & variant 2
				if [ "$cpuarch" = 7 ] && echo "$cpupart" | grep -Eq '^0x(c09|c0f|c0e)$'; then
					# armv7 vulnerable chips
					_debug "checking cpu$i: this armv7 vulnerable to spectre 1 & 2"
					variant1=vuln
					variant2=vuln
				elif [ "$cpuarch" = 8 ] && echo "$cpupart" | grep -Eq '^0x(d07|d08|d09|d0a)$'; then
					# armv8 vulnerable chips
					_debug "checking cpu$i: this armv8 vulnerable to spectre 1 & 2"
					variant1=vuln
					variant2=vuln
				else
					_debug "checking cpu$i: this arm non vulnerable to 1 & 2"
					# others are not vulnerable
					[ -z "$variant1" ] && variant1=immune
					[ -z "$variant2" ] && variant2=immune
				fi

				# for variant3, only A75 is vulnerable
				if [ "$cpuarch" = 8 ] && [ "$cpupart" = 0xd0a ]; then
					_debug "checking cpu$i: arm A75 vulnerable to meltdown"
					variant3=vuln
				else
					_debug "checking cpu$i: this arm non vulnerable to meltdown"
					[ -z "$variant3" ] && variant3=immune
				fi

				# for variant3a, only A15/A57/A72 are vulnerable
				if [ "$cpuarch" = 8 ] && echo "$cpupart" | grep -Eq '^0x(c0f|d07|d0a)$'; then
					_debug "checking cpu$i: arm A15-A57-A72 vulnerable to variant3a"
					variant3a=vuln
				else
					_debug "checking cpu$i: this arm non vulnerable to variant3a"
					[ -z "$variant3a" ] && variant3a=immune
				fi

				# for variant4, only A57-72-73-75 are vulnerable
				if [ "$cpuarch" = 8 ] && echo "$cpupart" | grep -Eq '^0xd0[789a]$'; then
					_debug "checking cpu$i: arm A57-A72-A73-A75 vulnerable to variant4"
					variant4=vuln
				else
					_debug "checking cpu$i: this arm non vulnerable to variant4"
					[ -z "$variant4" ] && variant4=immune
				fi
			fi
			_debug "is_cpu_vulnerable: for cpu$i and so far, we have <$variant1> <$variant2> <$variant3> <$variant3a> <$variant4>"
		done
	fi
	# from the information we have for now, it seems that CPUs that are vulnerable to variant1 are also vulnerable to variant4
	[ -z "$variant4" ] && variant4=$variant1
	_debug "is_cpu_vulnerable: temp results are <$variant1> <$variant2> <$variant3> <$variant3a> <$variant4>"
	# if at least one of the cpu is vulnerable, then the system is vulnerable
	[ "$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
	_debug "is_cpu_vulnerable: final results are <$variant1> <$variant2> <$variant3> <$variant3a> <$variant4>"
	is_cpu_vulnerable_cached=1
	_is_cpu_vulnerable_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_CEDARVIEW,   X86_FEATURE_ANY },
	# { X86_VENDOR_INTEL,     6, INTEL_FAM6_ATOM_CLOVERVIEW,  X86_FEATURE_ANY },
	# { X86_VENDOR_INTEL,     6, INTEL_FAM6_ATOM_LINCROFT,    X86_FEATURE_ANY },
	# { X86_VENDOR_INTEL,     6, INTEL_FAM6_ATOM_PENWELL,     X86_FEATURE_ANY },
	# { X86_VENDOR_INTEL,     6, INTEL_FAM6_ATOM_PINEVIEW,    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" = "$INTEL_FAM6_ATOM_CEDARVIEW"  ]      || \
				[ "$cpu_model" = "$INTEL_FAM6_ATOM_CLOVERVIEW" ] || \
				[ "$cpu_model" = "$INTEL_FAM6_ATOM_LINCROFT"   ] || \
				[ "$cpu_model" = "$INTEL_FAM6_ATOM_PENWELL"    ] || \
				[ "$cpu_model" = "$INTEL_FAM6_ATOM_PINEVIEW"   ]; then
				return 0
			fi
		elif [ "$cpu_family" = 5 ]; then
			return 0
		fi
	fi
	[ "$cpu_family" = 4 ] && return 0
	return 1
}

show_header()
{
	_info "Spectre and Meltdown mitigation detection tool v$VERSION"
	_info
}

parse_opt_file()
{
	# parse_opt_file option_name option_value
	option_name="$1"
	option_value="$2"
	if [ -z "$option_value" ]; then
		show_header
		show_usage
		echo "$0: error: --$option_name expects one parameter (a file)" >&2
		exit 1
	elif [ ! -e "$option_value" ]; then
		show_header
		echo "$0: error: couldn't find file $option_value" >&2
		exit 1
	elif [ ! -f "$option_value" ]; then
		show_header
		echo "$0: error: $option_value is not a file" >&2
		exit 1
	elif [ ! -r "$option_value" ]; then
		show_header
		echo "$0: error: couldn't read $option_value (are you root?)" >&2
		exit 1
	fi
	echo "$option_value"
	exit 0
}

while [ -n "$1" ]; do
	if [ "$1" = "--kernel" ]; then
		opt_kernel=$(parse_opt_file kernel "$2"); ret=$?
		[ $ret -ne 0 ] && exit 255
		shift 2
		opt_live=0
	elif [ "$1" = "--config" ]; then
		opt_config=$(parse_opt_file config "$2"); ret=$?
		[ $ret -ne 0 ] && exit 255
		shift 2
		opt_live=0
	elif [ "$1" = "--map" ]; then
		opt_map=$(parse_opt_file map "$2"); ret=$?
		[ $ret -ne 0 ] && exit 255
		shift 2
		opt_live=0
	elif [ "$1" = "--arch-prefix" ]; then
		opt_arch_prefix="$2"
		shift 2
	elif [ "$1" = "--live" ]; then
		opt_live_explicit=1
		shift
	elif [ "$1" = "--no-color" ]; then
		opt_no_color=1
		shift
	elif [ "$1" = "--no-sysfs" ]; then
		opt_no_sysfs=1
		shift
	elif [ "$1" = "--sysfs-only" ]; then
		opt_sysfs_only=1
		shift
	elif [ "$1" = "--coreos" ]; then
		opt_coreos=1
		shift
	elif [ "$1" = "--coreos-within-toolbox" ]; then
		# don't use directly: used internally by --coreos
		opt_coreos=0
		shift
	elif [ "$1" = "--paranoid" ]; then
		opt_paranoid=1
		shift
	elif [ "$1" = "--hw-only" ]; then
		opt_hw_only=1
		shift
	elif [ "$1" = "--no-hw" ]; then
		opt_no_hw=1
		shift
	elif [ "$1" = "--no-explain" ]; then
		opt_no_explain=1
		shift
	elif [ "$1" = "--batch" ]; then
		opt_batch=1
		opt_verbose=0
		shift
		case "$1" in
			text|nrpe|json|prometheus) opt_batch_format="$1"; shift;;
			--*) ;;    # allow subsequent flags
			'') ;;     # allow nothing at all
			*)
				echo "$0: error: unknown batch format '$1'" >&2
				echo "$0: error: --batch expects a format from: text, nrpe, json" >&2
				exit 255
				;;
		esac
	elif [ "$1" = "-v" ] || [ "$1" = "--verbose" ]; then
		opt_verbose=$(( opt_verbose + 1 ))
		shift
	elif [ "$1" = "--variant" ]; then
		if [ -z "$2" ]; then
			echo "$0: error: option --variant expects a parameter (1, 2 or 3)" >&2
			exit 255
		fi
		case "$2" in
			1)  opt_variant1=1;  opt_allvariants=0;;
			2)  opt_variant2=1;  opt_allvariants=0;;
			3)  opt_variant3=1;  opt_allvariants=0;;
			3a) opt_variant3a=1; opt_allvariants=0;;
			4)  opt_variant4=1;  opt_allvariants=0;;
			*)
				echo "$0: error: invalid parameter '$2' for --variant, expected either 1, 2, 3, 3a or 4" >&2;
				exit 255
				;;
		esac
		shift 2
	elif [ "$1" = "-h" ] || [ "$1" = "--help" ]; then
		show_header
		show_usage
		exit 0
	elif [ "$1" = "--version" ]; then
		opt_no_color=1
		show_header
		exit 0
	elif [ "$1" = "--disclaimer" ]; then
		show_header
		show_disclaimer
		exit 0
	else
		show_header
		show_usage
		echo "$0: error: unknown option '$1'"
		exit 255
	fi
done

show_header

if [ "$opt_no_sysfs" = 1 ] && [ "$opt_sysfs_only" = 1 ]; then
	_warn "Incompatible options specified (--no-sysfs and --sysfs-only), aborting"
	exit 255
fi

if [ "$opt_no_hw" = 1 ] && [ "$opt_hw_only" = 1 ]; then
	_warn "Incompatible options specified (--no-hw and --hw-only), aborting"
	exit 255
fi

# print status function
pstatus()
{
	if [ "$opt_no_color" = 1 ]; then
		_info_nol "$2"
	else
		case "$1" in
			red)    col="\033[41m\033[30m";;
			green)  col="\033[42m\033[30m";;
			yellow) col="\033[43m\033[30m";;
			blue)   col="\033[44m\033[30m";;
			*)      col="";;
		esac
		_info_nol "$col $2 \033[0m"
	fi
	[ -n "$3" ] && _info_nol " ($3)"
	_info
	unset col
}

# Print the final status of a vulnerability (incl. batch mode)
# Arguments are: CVE UNK/OK/VULN description
pvulnstatus()
{
	pvulnstatus_last_cve="$1"
	if [ "$opt_batch" = 1 ]; then
		case "$1" in
			CVE-2017-5753) aka="SPECTRE VARIANT 1";;
			CVE-2017-5715) aka="SPECTRE VARIANT 2";;
			CVE-2017-5754) aka="MELTDOWN";;
			CVE-2018-3640) aka="VARIANT 3A";;
			CVE-2018-3639) aka="VARIANT 4";;
		esac

		case "$opt_batch_format" in
			text) _echo 0 "$1: $2 ($3)";;
			json)
				case "$2" in
					UNK)  is_vuln="null";;
					VULN) is_vuln="true";;
					OK)   is_vuln="false";;
				esac
				json_output="${json_output:-[}{\"NAME\":\"$aka\",\"CVE\":\"$1\",\"VULNERABLE\":$is_vuln,\"INFOS\":\"$3\"},"
				;;

			nrpe)	[ "$2" = VULN ] && nrpe_vuln="$nrpe_vuln $1";;
			prometheus)
				prometheus_output="${prometheus_output:+$prometheus_output\n}specex_vuln_status{name=\"$aka\",cve=\"$1\",status=\"$2\",info=\"$3\"} 1"
				;;
		esac
	fi

	# always fill global_* vars because we use that do decide the program exit code
	case "$2" in
		UNK)  global_unknown="1";;
		VULN) global_critical="1";;
	esac

	# display info if we're not in quiet/batch mode
	vulnstatus="$2"
	shift 2
	_info_nol "> \033[46m\033[30mSTATUS:\033[0m "
	case "$vulnstatus" in
		UNK)  pstatus yellow 'UNKNOWN'        "$@";;
		VULN) pstatus red    'VULNERABLE'     "$@";;
		OK)   pstatus green  'NOT VULNERABLE' "$@";;
	esac
}


# The 3 below functions are taken from the extract-linux script, available here:
# https://github.com/torvalds/linux/blob/master/scripts/extract-vmlinux
# The functions have been modified for better integration to this script
# The original header of the file has been retained below

# ----------------------------------------------------------------------
# extract-vmlinux - Extract uncompressed vmlinux from a kernel image
#
# Inspired from extract-ikconfig
# (c) 2009,2010 Dick Streefland <dick@streefland.net>
#
# (c) 2011      Corentin Chary <corentin.chary@gmail.com>
#
# Licensed under the GNU General Public License, version 2 (GPLv2).
# ----------------------------------------------------------------------

kernel=''
kernel_err=''
check_kernel()
{
	_file="$1"
	_desperate_mode="$2"
	# checking the return code of readelf -h is not enough, we could get
	# a damaged ELF file and validate it, check for stderr warnings too
	_readelf_warnings=$("${opt_arch_prefix}readelf" -S "$_file" 2>&1 >/dev/null | tr "\n" "/"); ret=$?
	_readelf_sections=$("${opt_arch_prefix}readelf" -S "$_file" 2>/dev/null | grep -c -e data -e text -e init)
	_kernel_size=$(stat -c %s "$_file" 2>/dev/null || stat -f %z "$_file" 2>/dev/null || echo 10000)
	_debug "check_kernel: ret=$? size=$_kernel_size sections=$_readelf_sections warnings=$_readelf_warnings"
	if [ -n "$_desperate_mode" ]; then
		if "${opt_arch_prefix}strings" "$_file" | grep -Eq '^Linux version '; then
			_debug "check_kernel (desperate): ... matched!"
			return 0
		else
			_debug "check_kernel (desperate): ... invalid"