mirror of
https://github.com/speed47/spectre-meltdown-checker
synced 2024-12-23 04:43:37 +01:00
feat: implement support for NetBSD/FreeBSD/DragonFlyBSD
This commit is contained in:
Stéphane Lesimple
parent
889172dbb1
commit
ece25b98a1
@ -1,10 +1,13 @@
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Spectre & Meltdown Checker
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==========================
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A simple shell script to tell if your Linux installation is vulnerable against the 3 "speculative execution" CVEs that were made public early 2018.
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A shell script to tell if your system is vulnerable against the 3 "speculative execution" CVEs that were made public early 2018.
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Without options, it'll inspect your currently running kernel.
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You can also specify a kernel image on the command line, if you'd like to inspect a kernel you're not running.
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Supported systems:
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- Linux (all versions and flavors)
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- FreeBSD
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- NetBSD
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- DragonFlyBSD
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The script will do its best to detect mitigations, including backported non-vanilla patches, regardless of the advertised kernel version number.
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@ -20,8 +20,10 @@ exit_cleanup()
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[ -n "$vmlinuxtmp" ] && [ -f "$vmlinuxtmp" ] && rm -f "$vmlinuxtmp"
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[ -n "$vmlinuxtmp2" ] && [ -f "$vmlinuxtmp2" ] && rm -f "$vmlinuxtmp2"
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[ "$mounted_debugfs" = 1 ] && umount /sys/kernel/debug 2>/dev/null
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[ "$mounted_procfs" = 1 ] && umount "$procfs" 2>/dev/null
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[ "$insmod_cpuid" = 1 ] && rmmod cpuid 2>/dev/null
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[ "$insmod_msr" = 1 ] && rmmod msr 2>/dev/null
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[ "$kldload_cpuctl" = 1 ] && kldunload cpuctl 2>/dev/null
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}
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show_usage()
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@ -41,9 +43,9 @@ show_usage()
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Second mode is the "offline" mode, where you can inspect a non-running kernel.
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You'll need to specify the location of the vmlinux file, config and System.map files:
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--kernel vmlinux_file Specify a (possibly compressed) vmlinux file
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--config kernel_config Specify a kernel config file
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--map kernel_map_file Specify a kernel System.map file
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--kernel kernel_file Specify a (possibly compressed) Linux or BSD kernel file
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--config kernel_config Specify a kernel config file (Linux only)
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--map kernel_map_file Specify a kernel System.map file (Linux only)
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Options:
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--no-color Don't use color codes
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@ -100,6 +102,8 @@ This tool has been released in the hope that it'll be useful, but don't use it t
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EOF
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}
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os=$(uname -s)
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# parse options
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opt_kernel=''
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opt_config=''
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@ -123,12 +127,19 @@ global_critical=0
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global_unknown=0
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nrpe_vuln=""
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# find a sane `echo` command
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# find a sane command to print colored messages, we prefer `printf` over `echo`
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# because `printf` behavior is more standard across Linux/BSD
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# we'll try to avoid using shell builtins that might not take options
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if which echo >/dev/null 2>&1; then
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echo_cmd_type=echo
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if which printf >/dev/null 2>&1; then
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echo_cmd=$(which printf)
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echo_cmd_type=printf
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elif which echo >/dev/null 2>&1; then
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echo_cmd=$(which echo)
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else
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# which command is broken?
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[ -x /bin/echo ] && echo_cmd=/bin/echo
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# for Android
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[ -x /system/bin/echo ] && echo_cmd=/system/bin/echo
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fi
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# still empty ? fallback to builtin
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@ -143,11 +154,24 @@ __echo()
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# strip ANSI color codes
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# some sed versions (i.e. toybox) can't seem to handle
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# \033 aka \x1B correctly, so do it for them.
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_ctrlchar=$($echo_cmd -e "\033")
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_msg=$($echo_cmd -e "$_msg" | sed -r "s/$_ctrlchar\[([0-9][0-9]?(;[0-9][0-9]?)?)?m//g")
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if [ "$echo_cmd_type" = printf ]; then
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_interpret_chars=''
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else
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_interpret_chars='-e'
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fi
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_ctrlchar=$($echo_cmd $_interpret_chars "\033")
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_msg=$($echo_cmd $_interpret_chars "$_msg" | sed -r "s/$_ctrlchar\[([0-9][0-9]?(;[0-9][0-9]?)?)?m//g")
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fi
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if [ "$echo_cmd_type" = printf ]; then
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if [ "$opt" = "-n" ]; then
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$echo_cmd "$_msg"
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else
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$echo_cmd "$_msg\n"
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fi
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else
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# shellcheck disable=SC2086
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$echo_cmd $opt -e "$_msg"
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fi
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}
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_echo()
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@ -234,7 +258,7 @@ is_cpu_vulnerable()
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# https://github.com/crozone/SpectrePoC/issues/1 ^F E5200 => spectre 2 not vulnerable
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# https://github.com/paboldin/meltdown-exploit/issues/19 ^F E5200 => meltdown vulnerable
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# model name : Pentium(R) Dual-Core CPU E5200 @ 2.50GHz
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if grep -qE '^model name.+ Pentium\(R\) Dual-Core[[:space:]]+CPU[[:space:]]+E[0-9]{4}K? ' /proc/cpuinfo; then
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if grep -qE '^model name.+ Pentium\(R\) Dual-Core[[:space:]]+CPU[[:space:]]+E[0-9]{4}K? ' "$procfs/cpuinfo"; then
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variant1=vuln
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[ -z "$variant2" ] && variant2=immune
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variant3=vuln
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@ -669,14 +693,32 @@ mount_debugfs()
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load_msr()
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{
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if [ "$os" = Linux ]; then
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modprobe msr 2>/dev/null && insmod_msr=1
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_debug "attempted to load module msr, insmod_msr=$insmod_msr"
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else
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if ! kldstat -q -m cpuctl; then
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kldload cpuctl 2>/dev/null && kldload_cpuctl=1
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_debug "attempted to load module cpuctl, kldload_cpuctl=$kldload_cpuctl"
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else
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_debug "cpuctl module already loaded"
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fi
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fi
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}
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load_cpuid()
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{
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if [ "$os" = Linux ]; then
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modprobe cpuid 2>/dev/null && insmod_cpuid=1
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_debug "attempted to load module cpuid, insmod_cpuid=$insmod_cpuid"
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else
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if ! kldstat -q -m cpuctl; then
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kldload cpuctl 2>/dev/null && kldload_cpuctl=1
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_debug "attempted to load module cpuctl, kldload_cpuctl=$kldload_cpuctl"
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else
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_debug "cpuctl module already loaded"
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fi
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fi
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}
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read_cpuid()
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@ -685,19 +727,19 @@ read_cpuid()
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_bytenum="$2"
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_and_operand="$3"
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if [ ! -e /dev/cpu/0/cpuid ]; then
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if [ ! -e /dev/cpu/0/cpuid ] && [ ! -e /dev/cpuctl0 ]; then
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# try to load the module ourselves (and remember it so we can rmmod it afterwards)
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load_cpuid
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fi
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if [ ! -e /dev/cpu/0/cpuid ]; then
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return 2
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fi
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if [ -e /dev/cpu/0/cpuid ]; then
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# Linux
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# we need _leaf to be converted to decimal for dd
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_leaf=$(( _leaf ))
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if [ "$opt_verbose" -ge 3 ]; then
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dd if=/dev/cpu/0/cpuid bs=16 skip="$_leaf" iflag=skip_bytes count=1 >/dev/null 2>/dev/null
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_debug "cpuid: reading leaf$_leaf of cpuid on cpu0, ret=$?"
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_debug "cpuid: leaf$_leaf eax-ebx-ecx-edx: $( dd if=/dev/cpu/0/cpuid bs=16 skip="$_leaf" iflag=skip_bytes count=1 2>/dev/null | od -x -A n)"
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_debug "cpuid: leaf$_leaf edx higher byte is: $(dd if=/dev/cpu/0/cpuid bs=16 skip="$_leaf" iflag=skip_bytes count=1 2>/dev/null | dd bs=1 skip="$_bytenum" count=1 2>/dev/null | od -x -A n)"
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fi
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# getting proper byte of edx on leaf$_leaf of cpuinfo in decimal
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_reg_byte=$(dd if=/dev/cpu/0/cpuid bs=16 skip="$_leaf" iflag=skip_bytes count=1 2>/dev/null | dd bs=1 skip="$_bytenum" count=1 2>/dev/null | od -t u1 -A n | awk '{print $1}')
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@ -707,6 +749,48 @@ read_cpuid()
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[ "$_reg_bit" -eq 0 ] && return 1
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# $_reg_bit is > 0, so the bit was found: return true (aka 0)
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return 0
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elif [ -e /dev/cpuctl0 ]; then
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# BSD
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_cpuid=$(cpucontrol -i "$_leaf" /dev/cpuctl0 2>/dev/null | awk '{print $4,$5,$6,$7}')
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# cpuid level 0x1: 0x000306d4 0x00100800 0x4dfaebbf 0xbfebfbff
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_debug "cpuid: got $_cpuid for leaf $_leaf"
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if [ "$_bytenum" -lt 4 ]; then
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_reg_byte=$(echo "$_cpuid" | awk '{print $1}')
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_debug "cpuid: $_bytenum is part of EAX ($_reg_byte)"
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elif [ "$_bytenum" -lt 8 ]; then
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_reg_byte=$(echo "$_cpuid" | awk '{print $2}')
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_debug "cpuid: $_bytenum is part of EBX ($_reg_byte)"
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elif [ "$_bytenum" -lt 12 ]; then
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_reg_byte=$(echo "$_cpuid" | awk '{print $3}')
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_debug "cpuid: $_bytenum is part of ECX ($_reg_byte)"
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elif [ "$_bytenum" -lt 16 ]; then
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_reg_byte=$(echo "$_cpuid" | awk '{print $4}')
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_debug "cpuid: $_bytenum is part of EDX ($_reg_byte)"
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else
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_warn "read_cpuid: error in the program, please report to the developer ($_leaf/$_bytenum/$_and_operand)"
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exit 1
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fi
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_bytenum=$(( _bytenum % 4 ))
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case "$_bytenum" in
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0) _reg_byte=0x$(echo "$_reg_byte" | cut -c9-10) ;;
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1) _reg_byte=0x$(echo "$_reg_byte" | cut -c7-8) ;;
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2) _reg_byte=0x$(echo "$_reg_byte" | cut -c5-6) ;;
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3) _reg_byte=0x$(echo "$_reg_byte" | cut -c3-4) ;;
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*) exit 8;
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esac
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_debug "cpuid: wanted byte is $_reg_byte"
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# convert to decimal
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_reg_byte=$(( _reg_byte ))
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_debug "cpuid: decimal value is $_reg_byte"
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_reg_bit=$(( _reg_byte & _and_operand ))
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_debug "cpuid: leaf$_leaf byte $_bytenum & $_and_operand = $_reg_bit"
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[ "$_reg_bit" -eq 0 ] && return 1
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# $_reg_bit is > 0, so the bit was found: return true (aka 0)
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return 0
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fi
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return 2
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}
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dmesg_grep()
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@ -714,7 +798,7 @@ dmesg_grep()
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# grep for something in dmesg, ensuring that the dmesg buffer
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# has not been truncated
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dmesg_grepped=''
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if ! dmesg | grep -qE '(^|\] )Linux version [0-9]'; then
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if ! dmesg | grep -qE -e '(^|\] )Linux version [0-9]' -e '^FreeBSD is a registered' ; then
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# dmesg truncated
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return 2
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fi
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@ -734,15 +818,17 @@ is_coreos()
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parse_cpu_details()
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{
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[ "$parse_cpu_details_done" = 1 ] && return 0
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cpu_vendor=$( grep '^vendor_id' /proc/cpuinfo | awk '{print $3}' | head -1)
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cpu_friendly_name=$(grep '^model name' /proc/cpuinfo | cut -d: -f2- | head -1 | sed -e 's/^ *//')
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if [ -e "$procfs/cpuinfo" ]; then
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cpu_vendor=$( grep '^vendor_id' "$procfs/cpuinfo" | awk '{print $3}' | head -1)
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cpu_friendly_name=$(grep '^model name' "$procfs/cpuinfo" | cut -d: -f2- | head -1 | sed -e 's/^ *//')
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# special case for ARM follows
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if grep -qi 'CPU implementer[[:space:]]*:[[:space:]]*0x41' /proc/cpuinfo; then
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if grep -qi 'CPU implementer[[:space:]]*:[[:space:]]*0x41' "$procfs/cpuinfo"; then
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cpu_vendor='ARM'
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# some devices (phones or other) have several ARMs and as such different part numbers,
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# an example is "bigLITTLE", so we need to store the whole list, this is needed for is_cpu_vulnerable
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cpu_part_list=$(awk '/CPU part/ {print $4}' /proc/cpuinfo)
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cpu_arch_list=$(awk '/CPU architecture/ {print $3}' /proc/cpuinfo)
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cpu_part_list=$(awk '/CPU part/ {print $4}' "$procfs/cpuinfo")
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cpu_arch_list=$(awk '/CPU architecture/ {print $3}' "$procfs/cpuinfo")
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# take the first one to fill the friendly name, do NOT quote the vars below
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# shellcheck disable=SC2086
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cpu_arch=$(echo $cpu_arch_list | awk '{ print $1 }')
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@ -754,11 +840,14 @@ parse_cpu_details()
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[ -n "$cpu_part" ] && cpu_friendly_name="$cpu_friendly_name model $cpu_part"
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fi
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cpu_family=$( grep '^cpu family' /proc/cpuinfo | awk '{print $4}' | grep -E '^[0-9]+$' | head -1)
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cpu_model=$( grep '^model' /proc/cpuinfo | awk '{print $3}' | grep -E '^[0-9]+$' | head -1)
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cpu_stepping=$(grep '^stepping' /proc/cpuinfo | awk '{print $3}' | grep -E '^[0-9]+$' | head -1)
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cpu_ucode=$( grep '^microcode' /proc/cpuinfo | awk '{print $3}' | head -1)
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cpu_family=$( grep '^cpu family' "$procfs/cpuinfo" | awk '{print $4}' | grep -E '^[0-9]+$' | head -1)
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cpu_model=$( grep '^model' "$procfs/cpuinfo" | awk '{print $3}' | grep -E '^[0-9]+$' | head -1)
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cpu_stepping=$(grep '^stepping' "$procfs/cpuinfo" | awk '{print $3}' | grep -E '^[0-9]+$' | head -1)
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cpu_ucode=$( grep '^microcode' "$procfs/cpuinfo" | awk '{print $3}' | head -1)
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echo "$cpu_ucode" | grep -q ^0x && cpu_ucode_decimal=$(( cpu_ucode ))
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else
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cpu_friendly_name=$(sysctl -n hw.model)
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fi
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# also define those that we will need in other funcs
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# taken from ttps://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/arch/x86/include/asm/intel-family.h
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@ -903,6 +992,16 @@ is_skylake_cpu()
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return 1
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}
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# ENTRYPOINT
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# we can't do anything useful under WSL
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if uname -a | grep -qE -- '-Microsoft #[0-9]+-Microsoft '; then
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_warn "This script doesn't work under Windows Subsystem for Linux"
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_warn "You should use the official Microsoft tool instead."
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_warn "It can be found under https://aka.ms/SpeculationControlPS"
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exit 1
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fi
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# check for mode selection inconsistency
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if [ "$opt_live_explicit" = 1 ]; then
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if [ -n "$opt_kernel" ] || [ -n "$opt_config" ] || [ -n "$opt_map" ]; then
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@ -932,6 +1031,27 @@ else
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fi
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fi
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# if we're under a BSD, try to mount linprocfs for "$procfs/cpuinfo"
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procfs=/proc
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if echo "$os" | grep -q BSD; then
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_debug "We're under BSD, check if we have procfs"
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procfs=$(mount | awk '/^linprocfs/ { print $3; exit; }')
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if [ -z "$procfs" ]; then
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_debug "we don't, try to mount it"
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procfs=/proc
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[ -d /compat/linux/proc ] && procfs=/compat/linux/proc
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test -d $procfs || mkdir $procfs
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if mount -t linprocfs linprocfs $procfs 2>/dev/null; then
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mounted_procfs=1
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_debug "procfs just mounted at $procfs"
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else
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procfs=''
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fi
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else
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_debug "We do: $procfs"
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fi
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fi
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parse_cpu_details
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if [ "$opt_live" = 1 ]; then
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# root check (only for live mode, for offline mode, we already checked if we could read the files)
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@ -1014,30 +1134,32 @@ else
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bad_accuracy=1
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fi
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if [ -n "$opt_config" ] && ! grep -q '^CONFIG_' "$opt_config"; then
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if [ "$os" = Linux ]; then
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if [ -n "$opt_config" ] && ! grep -q '^CONFIG_' "$opt_config"; then
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# given file is invalid!
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_warn "The kernel config file seems invalid, was expecting a plain-text file, ignoring it!"
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opt_config=''
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fi
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fi
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if [ -n "$dumped_config" ] && [ -n "$opt_config" ]; then
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if [ -n "$dumped_config" ] && [ -n "$opt_config" ]; then
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_verbose "Will use kconfig \033[35m/proc/config.gz (decompressed)\033[0m"
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elif [ -n "$opt_config" ]; then
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elif [ -n "$opt_config" ]; then
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_verbose "Will use kconfig \033[35m$opt_config\033[0m"
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else
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else
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_verbose "Will use no kconfig (accuracy might be reduced)"
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bad_accuracy=1
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fi
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fi
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if [ -n "$opt_map" ]; then
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if [ -n "$opt_map" ]; then
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_verbose "Will use System.map file \033[35m$opt_map\033[0m"
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else
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else
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_verbose "Will use no System.map file (accuracy might be reduced)"
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bad_accuracy=1
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fi
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fi
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if [ "$bad_accuracy" = 1 ]; then
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if [ "$bad_accuracy" = 1 ]; then
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_info "We're missing some kernel info (see -v), accuracy might be reduced"
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fi
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fi
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if [ -e "$opt_kernel" ]; then
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@ -1065,13 +1187,16 @@ else
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# try even harder with some kernels (such as ARM) that split the release (uname -r) and version (uname -v) in 2 adjacent strings
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vmlinux_version=$("${opt_arch_prefix}strings" "$vmlinux" 2>/dev/null | grep -E -B1 '^#[0-9]+ .+ (19|20)[0-9][0-9]$' | tr "\n" " ")
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fi
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if [ -z "$vmlinux_version" ]; then
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# FreeBSD?
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vmlinux_version=$("${opt_arch_prefix}strings" "$vmlinux" 2>/dev/null | grep -E '^FreeBSD [0-9]' | head -1)
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fi
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if [ -n "$vmlinux_version" ]; then
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# in live mode, check if the img we found is the correct one
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if [ "$opt_live" = 1 ]; then
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_verbose "Kernel image is \033[35m$vmlinux_version"
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if ! echo "$vmlinux_version" | grep -qF "$(uname -r)" || \
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! echo "$vmlinux_version" | grep -qF "$(uname -v)"; then
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_warn "Possible disrepancy between your running kernel and the image we found ($opt_kernel), results might be incorrect"
|
||||
if ! echo "$vmlinux_version" | grep -qF "$(uname -r)"; then
|
||||
_warn "Possible disrepancy between your running kernel '$(uname -r)' and the image '$vmlinux_version' we found ($opt_kernel), results might be incorrect"
|
||||
fi
|
||||
else
|
||||
_info "Kernel image is \033[35m$vmlinux_version"
|
||||
@ -1115,24 +1240,29 @@ sys_interface_check()
|
||||
|
||||
number_of_cpus()
|
||||
{
|
||||
n=$(grep -c ^processor /proc/cpuinfo)
|
||||
if echo "$os" | grep BSD; then
|
||||
n=$(sysctl -n hw.ncpu 2>/dev/null || echo 1)
|
||||
elif [ -e "$procfs/cpuinfo" ]; then
|
||||
n=$(grep -c ^processor "$procfs/cpuinfo" 2>/dev/null || echo 1)
|
||||
else
|
||||
# if we don't know, default to 1 CPU
|
||||
n=1
|
||||
fi
|
||||
return "$n"
|
||||
}
|
||||
|
||||
# $1 - msr number
|
||||
# $2 - cpu index
|
||||
check_msr_enable()
|
||||
write_msr()
|
||||
{
|
||||
dd if=/dev/cpu/"$2"/msr of=/dev/null bs=8 count=1 skip="$1" iflag=skip_bytes 2>/dev/null; ret=$?
|
||||
return $ret
|
||||
}
|
||||
|
||||
# $1 - msr number
|
||||
# $2 - cpu index
|
||||
# $3 - value
|
||||
write_to_msr()
|
||||
{
|
||||
$echo_cmd -ne "$3" | dd of=/dev/cpu/"$2"/msr bs=8 count=1 seek="$1" oflag=seek_bytes 2>/dev/null; ret=$?
|
||||
if [ "$os" != Linux ]; then
|
||||
cpucontrol -m "$1=0" "/dev/cpuctl$2" >/dev/null 2>&1; ret=$?
|
||||
else
|
||||
# convert to decimal
|
||||
_msrindex=$(( $1 ))
|
||||
_echo_nol -9 "\0\0\0\0\0\0\0\0" | dd of=/dev/cpu/"$2"/msr bs=8 count=1 seek="$_msrindex" oflag=seek_bytes 2>/dev/null; ret=$?
|
||||
fi
|
||||
_debug "write_msr: for cpu $2 on msr $1 ($_msrindex), ret=$ret"
|
||||
return $ret
|
||||
}
|
||||
|
||||
@ -1140,8 +1270,26 @@ write_to_msr()
|
||||
# $2 - cpu index
|
||||
read_msr()
|
||||
{
|
||||
msr=$(dd if=/dev/cpu/"$2"/msr bs=8 count=1 skip="$1" iflag=skip_bytes 2>/dev/null | od -t u1 -A n | awk '{print $8}');
|
||||
return "$msr"
|
||||
read_msr_value=''
|
||||
if [ "$os" != Linux ]; then
|
||||
_msr=$(cpucontrol -m "$1" "/dev/cpuctl$2" 2>/dev/null); ret=$?
|
||||
[ $ret -ne 0 ] && return 1
|
||||
# MSR 0x10: 0x000003e1 0xb106dded
|
||||
_msr_h=$(echo "$_msr" | awk '{print $3}');
|
||||
_msr_h="$(( _msr_h >> 24 & 0xFF )) $(( _msr_h >> 16 & 0xFF )) $(( _msr_h >> 8 & 0xFF )) $(( _msr_h & 0xFF ))"
|
||||
_msr_l=$(echo "$_msr" | awk '{print $4}');
|
||||
_msr_l="$(( _msr_l >> 24 & 0xFF )) $(( _msr_l >> 16 & 0xFF )) $(( _msr_l >> 8 & 0xFF )) $(( _msr_l & 0xFF ))"
|
||||
read_msr_value="$_msr_h $_msr_l"
|
||||
else
|
||||
# convert to decimal
|
||||
_msrindex=$(( $1 ))
|
||||
if ! dd if=/dev/cpu/"$2"/msr bs=8 count=1 skip="$_msrindex" iflag=skip_bytes 2>/dev/null; then
|
||||
return 1
|
||||
fi
|
||||
read_msr_value=$(dd if=/dev/cpu/"$2"/msr bs=8 count=1 skip="$_msrindex" iflag=skip_bytes 2>/dev/null | od -t u1 -A n)
|
||||
fi
|
||||
_debug "read_msr: MSR=$1 value is $read_msr_value"
|
||||
return 0
|
||||
}
|
||||
|
||||
|
||||
@ -1159,13 +1307,13 @@ check_cpu()
|
||||
number_of_cpus
|
||||
ncpus=$?
|
||||
idx_max_cpu=$((ncpus-1))
|
||||
if [ ! -e /dev/cpu/0/msr ]; then
|
||||
if [ ! -e /dev/cpu/0/msr ] && [ ! -e /dev/cpuctl0 ]; then
|
||||
# try to load the module ourselves (and remember it so we can rmmod it afterwards)
|
||||
load_msr
|
||||
fi
|
||||
if [ ! -e /dev/cpu/0/msr ]; then
|
||||
if [ ! -e /dev/cpu/0/msr ] && [ ! -e /dev/cpuctl0 ]; then
|
||||
spec_ctrl_msr=-1
|
||||
pstatus yellow UNKNOWN "couldn't read /dev/cpu/0/msr, is msr support enabled in your kernel?"
|
||||
pstatus yellow UNKNOWN "couldn't read MSR, is MSR support enabled in your kernel?"
|
||||
else
|
||||
# the new MSR 'SPEC_CTRL' is at offset 0x48
|
||||
# here we use dd, it's the same as using 'rdmsr 0x48' but without needing the rdmsr tool
|
||||
@ -1175,8 +1323,7 @@ check_cpu()
|
||||
cpu_mismatch=0
|
||||
for i in $(seq 0 "$idx_max_cpu")
|
||||
do
|
||||
check_msr_enable 72 "$i"
|
||||
ret=$?
|
||||
read_msr 0x48 "$i"; ret=$?
|
||||
if [ "$i" -eq 0 ]; then
|
||||
val=$ret
|
||||
else
|
||||
@ -1203,7 +1350,7 @@ check_cpu()
|
||||
|
||||
_info_nol " * CPU indicates IBRS capability: "
|
||||
# from kernel src: { X86_FEATURE_SPEC_CTRL, CPUID_EDX,26, 0x00000007, 0 },
|
||||
read_cpuid 7 15 4; ret=$?
|
||||
read_cpuid 0x7 15 4; ret=$?
|
||||
if [ $ret -eq 0 ]; then
|
||||
pstatus green YES "SPEC_CTRL feature bit"
|
||||
cpuid_spec_ctrl=1
|
||||
@ -1220,7 +1367,7 @@ check_cpu()
|
||||
# but let's check it anyway (in verbose mode only)
|
||||
_verbose_nol " * Kernel has set the spec_ctrl flag in cpuinfo: "
|
||||
if [ "$opt_live" = 1 ]; then
|
||||
if grep ^flags /proc/cpuinfo | grep -qw spec_ctrl; then
|
||||
if grep ^flags "$procfs/cpuinfo" | grep -qw spec_ctrl; then
|
||||
pstatus green YES
|
||||
else
|
||||
pstatus blue NO
|
||||
@ -1233,7 +1380,7 @@ check_cpu()
|
||||
# IBPB
|
||||
_info " * Indirect Branch Prediction Barrier (IBPB)"
|
||||
_info_nol " * PRED_CMD MSR is available: "
|
||||
if [ ! -e /dev/cpu/0/msr ]; then
|
||||
if [ ! -e /dev/cpu/0/msr ] && [ ! -e /dev/cpuctl0 ]; then
|
||||
pstatus yellow UNKNOWN "couldn't read /dev/cpu/0/msr, is msr support enabled in your kernel?"
|
||||
else
|
||||
# the new MSR 'PRED_CTRL' is at offset 0x49, write-only
|
||||
@ -1243,8 +1390,7 @@ check_cpu()
|
||||
cpu_mismatch=0
|
||||
for i in $(seq 0 "$idx_max_cpu")
|
||||
do
|
||||
write_to_msr 73 "$i" "\0\0\0\0\0\0\0\0"
|
||||
ret=$?
|
||||
write_msr 0x49 "$i"; ret=$?
|
||||
if [ "$i" -eq 0 ]; then
|
||||
val=$ret
|
||||
else
|
||||
@ -1269,7 +1415,7 @@ check_cpu()
|
||||
|
||||
_info_nol " * CPU indicates IBPB capability: "
|
||||
# CPUID EAX=0x80000008, ECX=0x00 return EBX[12] indicates support for just IBPB.
|
||||
read_cpuid 2147483656 5 16; ret=$?
|
||||
read_cpuid 0x80000008 5 16; ret=$?
|
||||
if [ $ret -eq 0 ]; then
|
||||
pstatus green YES "IBPB_SUPPORT feature bit"
|
||||
elif [ "$cpuid_spec_ctrl" = 1 ]; then
|
||||
@ -1293,7 +1439,7 @@ check_cpu()
|
||||
|
||||
_info_nol " * CPU indicates STIBP capability: "
|
||||
# A processor supports STIBP if it enumerates CPUID (EAX=7H,ECX=0):EDX[27] as 1
|
||||
read_cpuid 7 15 8; ret=$?
|
||||
read_cpuid 0x7 15 8; ret=$?
|
||||
if [ $ret -eq 0 ]; then
|
||||
pstatus green YES
|
||||
elif [ $ret -eq 2 ]; then
|
||||
@ -1306,7 +1452,7 @@ check_cpu()
|
||||
_info_nol " * CPU indicates ARCH_CAPABILITIES MSR availability: "
|
||||
cpuid_arch_capabilities=-1
|
||||
# A processor supports STIBP if it enumerates CPUID (EAX=7H,ECX=0):EDX[27] as 1
|
||||
read_cpuid 7 15 32; ret=$?
|
||||
read_cpuid 0x7 15 32; ret=$?
|
||||
if [ $ret -eq 0 ]; then
|
||||
pstatus green YES
|
||||
cpuid_arch_capabilities=1
|
||||
@ -1326,7 +1472,7 @@ check_cpu()
|
||||
capabilities_rdcl_no=0
|
||||
capabilities_ibrs_all=0
|
||||
pstatus red NO
|
||||
elif [ ! -e /dev/cpu/0/msr ]; then
|
||||
elif [ ! -e /dev/cpu/0/msr ] && [ ! -e /dev/cpuctl0 ]; then
|
||||
spec_ctrl_msr=-1
|
||||
pstatus yellow UNKNOWN "couldn't read /dev/cpu/0/msr, is msr support enabled in your kernel?"
|
||||
else
|
||||
@ -1338,10 +1484,8 @@ check_cpu()
|
||||
cpu_mismatch=0
|
||||
for i in $(seq 0 "$idx_max_cpu")
|
||||
do
|
||||
check_msr_enable 266 "$i"
|
||||
ret=$?
|
||||
read_msr 266 "$i"
|
||||
capabilities=$?
|
||||
read_msr 0x10a "$i"; ret=$?
|
||||
capabilities=$(echo "$read_msr_value" | awk '{print $8}')
|
||||
if [ "$i" -eq 0 ]; then
|
||||
val=$ret
|
||||
val_cap_msr=$capabilities
|
||||
@ -1445,7 +1589,17 @@ check_redhat_canonical_spectre()
|
||||
check_variant1()
|
||||
{
|
||||
_info "\033[1;34mCVE-2017-5753 [bounds check bypass] aka 'Spectre Variant 1'\033[0m"
|
||||
if [ "$os" = Linux ]; then
|
||||
check_variant1_linux
|
||||
elif echo "$os" | grep -q BSD; then
|
||||
check_variant1_bsd
|
||||
else
|
||||
_warn "Unsupported OS ($os)"
|
||||
fi
|
||||
}
|
||||
|
||||
check_variant1_linux()
|
||||
{
|
||||
status=UNK
|
||||
sys_interface_available=0
|
||||
msg=''
|
||||
@ -1566,12 +1720,34 @@ check_variant1()
|
||||
fi
|
||||
}
|
||||
|
||||
check_variant1_bsd()
|
||||
{
|
||||
cve='CVE-2017-5753'
|
||||
if ! is_cpu_vulnerable 1; then
|
||||
# override status & msg in case CPU is not vulnerable after all
|
||||
pvulnstatus $cve OK "your CPU vendor reported your CPU model as not vulnerable"
|
||||
else
|
||||
pvulnstatus $cve VULN "no mitigation for BSD yet"
|
||||
fi
|
||||
}
|
||||
|
||||
|
||||
###################
|
||||
# SPECTRE VARIANT 2
|
||||
check_variant2()
|
||||
{
|
||||
_info "\033[1;34mCVE-2017-5715 [branch target injection] aka 'Spectre Variant 2'\033[0m"
|
||||
if [ "$os" = Linux ]; then
|
||||
check_variant2_linux
|
||||
elif echo "$os" | grep -q BSD; then
|
||||
check_variant2_bsd
|
||||
else
|
||||
_warn "Unsupported OS ($os)"
|
||||
fi
|
||||
}
|
||||
|
||||
check_variant2_linux()
|
||||
{
|
||||
status=UNK
|
||||
sys_interface_available=0
|
||||
msg=''
|
||||
@ -1613,13 +1789,13 @@ check_variant2()
|
||||
_debug "ibrs: $dir/ibrs_enabled file doesn't exist"
|
||||
fi
|
||||
done
|
||||
# on some newer kernels, the spec_ctrl_ibrs flag in /proc/cpuinfo
|
||||
# on some newer kernels, the spec_ctrl_ibrs flag in "$procfs/cpuinfo"
|
||||
# is set when ibrs has been administratively enabled (usually from cmdline)
|
||||
# which in that case means ibrs is supported *and* enabled for kernel & user
|
||||
# as per the ibrs patch series v3
|
||||
if [ "$ibrs_supported" = 0 ]; then
|
||||
if grep ^flags /proc/cpuinfo | grep -qw spec_ctrl_ibrs; then
|
||||
_debug "ibrs: found spec_ctrl_ibrs flag in /proc/cpuinfo"
|
||||
if grep ^flags "$procfs/cpuinfo" | grep -qw spec_ctrl_ibrs; then
|
||||
_debug "ibrs: found spec_ctrl_ibrs flag in $procfs/cpuinfo"
|
||||
ibrs_supported=1
|
||||
# enabled=2 -> kernel & user
|
||||
ibrs_enabled=2
|
||||
@ -1851,12 +2027,55 @@ check_variant2()
|
||||
fi
|
||||
}
|
||||
|
||||
check_variant2_bsd()
|
||||
{
|
||||
_info_nol "* Kernel supports IBRS: "
|
||||
ibrs_disabled=$(sysctl -n hw.ibrs_disable 2>/dev/null)
|
||||
if [ -z "$ibrs_disabled" ]; then
|
||||
pstatus red NO
|
||||
else
|
||||
pstatus green YES
|
||||
fi
|
||||
|
||||
_info_nol "* IBRS enabled and active: "
|
||||
ibrs_active=$(sysctl -n hw.ibrs_active 2>/dev/null)
|
||||
if [ "$ibrs_active" = 1 ]; then
|
||||
pstatus green YES
|
||||
else
|
||||
pstatus red NO
|
||||
fi
|
||||
|
||||
cve='CVE-2017-5715'
|
||||
if ! is_cpu_vulnerable 2; then
|
||||
# override status & msg in case CPU is not vulnerable after all
|
||||
pvulnstatus $cve OK "your CPU vendor reported your CPU model as not vulnerable"
|
||||
elif [ "$ibrs_active" = 1 ]; then
|
||||
pvulnstatus $cve OK "IBRS mitigates the vulnerability"
|
||||
elif [ "$ibrs_disabled" = 0 ]; then
|
||||
pvulnstatus $cve VULN "IBRS is supported by your kernel but your CPU microcode lacks support"
|
||||
elif [ "$ibrs_disabled" = 1 ]; then
|
||||
pvulnstatus $cve VULN "IBRS is supported but administratively disabled on your system"
|
||||
else
|
||||
pvulnstatus $cve VULN "IBRS is needed to mitigate the vulnerability but your kernel is missing support"
|
||||
fi
|
||||
}
|
||||
|
||||
########################
|
||||
# MELTDOWN aka VARIANT 3
|
||||
check_variant3()
|
||||
{
|
||||
_info "\033[1;34mCVE-2017-5754 [rogue data cache load] aka 'Meltdown' aka 'Variant 3'\033[0m"
|
||||
if [ "$os" = Linux ]; then
|
||||
check_variant3_linux
|
||||
elif echo "$os" | grep -q BSD; then
|
||||
check_variant3_bsd
|
||||
else
|
||||
_warn "Unsupported OS ($os)"
|
||||
fi
|
||||
}
|
||||
|
||||
check_variant3_linux()
|
||||
{
|
||||
status=UNK
|
||||
sys_interface_available=0
|
||||
msg=''
|
||||
@ -1913,13 +2132,13 @@ check_variant3()
|
||||
dmesg_grep="Kernel/User page tables isolation: enabled"
|
||||
dmesg_grep="$dmesg_grep|Kernel page table isolation enabled"
|
||||
dmesg_grep="$dmesg_grep|x86/pti: Unmapping kernel while in userspace"
|
||||
if grep ^flags /proc/cpuinfo | grep -qw pti; then
|
||||
if grep ^flags "$procfs/cpuinfo" | grep -qw pti; then
|
||||
# vanilla PTI patch sets the 'pti' flag in cpuinfo
|
||||
_debug "kpti_enabled: found 'pti' flag in /proc/cpuinfo"
|
||||
_debug "kpti_enabled: found 'pti' flag in $procfs/cpuinfo"
|
||||
kpti_enabled=1
|
||||
elif grep ^flags /proc/cpuinfo | grep -qw kaiser; then
|
||||
elif grep ^flags "$procfs/cpuinfo" | grep -qw kaiser; then
|
||||
# kernel line 4.9 sets the 'kaiser' flag in cpuinfo
|
||||
_debug "kpti_enabled: found 'kaiser' flag in /proc/cpuinfo"
|
||||
_debug "kpti_enabled: found 'kaiser' flag in $procfs/cpuinfo"
|
||||
kpti_enabled=1
|
||||
elif [ -e /sys/kernel/debug/x86/pti_enabled ]; then
|
||||
# Red Hat Backport creates a dedicated file, see https://access.redhat.com/articles/3311301
|
||||
@ -1960,13 +2179,13 @@ check_variant3()
|
||||
if [ "$opt_verbose" -ge 2 ]; then
|
||||
_info "* Performance impact if PTI is enabled"
|
||||
_info_nol " * CPU supports PCID: "
|
||||
if grep ^flags /proc/cpuinfo | grep -qw pcid; then
|
||||
if grep ^flags "$procfs/cpuinfo" | grep -qw pcid; then
|
||||
pstatus green YES 'performance degradation with PTI will be limited'
|
||||
else
|
||||
pstatus blue NO 'no security impact but performance will be degraded with PTI'
|
||||
fi
|
||||
_info_nol " * CPU supports INVPCID: "
|
||||
if grep ^flags /proc/cpuinfo | grep -qw invpcid; then
|
||||
if grep ^flags "$procfs/cpuinfo" | grep -qw invpcid; then
|
||||
pstatus green YES 'performance degradation with PTI will be limited'
|
||||
else
|
||||
pstatus blue NO 'no security impact but performance will be degraded with PTI'
|
||||
@ -2058,6 +2277,36 @@ check_variant3()
|
||||
fi
|
||||
}
|
||||
|
||||
check_variant3_bsd()
|
||||
{
|
||||
_info_nol "* Kernel supports Page Table Isolation (PTI): "
|
||||
kpti_enabled=$(sysctl -n vm.pmap.pti 2>/dev/null)
|
||||
if [ -z "$kpti_enabled" ]; then
|
||||
pstatus red NO
|
||||
else
|
||||
pstatus green YES
|
||||
fi
|
||||
|
||||
_info_nol "* PTI enabled and active: "
|
||||
if [ "$kpti_enabled" = 1 ]; then
|
||||
pstatus green YES
|
||||
else
|
||||
pstatus red NO
|
||||
fi
|
||||
|
||||
cve='CVE-2017-5754'
|
||||
if ! is_cpu_vulnerable 3; then
|
||||
# override status & msg in case CPU is not vulnerable after all
|
||||
pvulnstatus $cve OK "your CPU vendor reported your CPU model as not vulnerable"
|
||||
elif [ "$kpti_enabled" = 1 ]; then
|
||||
pvulnstatus $cve OK "PTI mitigates the vulnerability"
|
||||
elif [ -n "$kpti_enabled" ]; then
|
||||
pvulnstatus $cve VULN "PTI is supported but disabled on your system"
|
||||
else
|
||||
pvulnstatus $cve VULN "PTI is needed to mitigate the vulnerability"
|
||||
fi
|
||||
}
|
||||
|
||||
check_cpu
|
||||
check_cpu_vulnerabilities
|
||||
_info
|
||||
|
||||
Loading…
Reference in New Issue
Block a user