mirror of
https://github.com/speed47/spectre-meltdown-checker
synced 2024-12-22 20:33:56 +01:00
Introduce "verbose" and "batch" modes
Rewrite the way the output is processed: - Define verbosity level (currently warn, info (default) & verbose) - Add a batch mode, for simple machine parsing
This commit is contained in:
Vincent Brillault
parent
5fd85e288b
commit
ad342cab06
@ -33,6 +33,8 @@ show_usage()
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Options:
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--no-color Don't use color codes
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-v, --verbose Increase verbosity level
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--batch Produce machine readable output
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EOF
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}
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@ -44,6 +46,8 @@ opt_map=''
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opt_live_explicit=0
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opt_live=1
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opt_no_color=0
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opt_batch=0
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opt_verbose=1
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__echo()
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{
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@ -60,12 +64,38 @@ __echo()
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_echo()
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{
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if [ $opt_verbose -ge $1 ]; then
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shift
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__echo '' "$@"
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fi
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}
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_echo_nol()
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{
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if [ $opt_verbose -ge $1 ]; then
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shift
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__echo -n "$@"
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fi
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}
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_warn()
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{
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_echo 0 "\033[31m${@}\033[0m"
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}
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_info()
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{
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_echo 1 "$@"
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}
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_info_nol()
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{
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_echo_nol 1 "$@"
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}
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_verbose()
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{
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_echo 2 "$@"
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}
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is_cpu_vulnerable()
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@ -116,8 +146,11 @@ is_cpu_vulnerable()
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return 255
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}
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_echo "\033[1;34mSpectre and Meltdown mitigation detection tool v$VERSION\033[0m"
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_echo
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show_header()
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{
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_info "\033[1;34mSpectre and Meltdown mitigation detection tool v$VERSION\033[0m"
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_info
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}
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parse_opt_file()
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{
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@ -125,16 +158,20 @@ parse_opt_file()
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option_name="$1"
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option_value="$2"
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if [ -z "$option_value" ]; then
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show_header
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show_usage
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echo "$0: error: --$option_name expects one parameter (a file)" >&2
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exit 1
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elif [ ! -e "$option_value" ]; then
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show_header
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echo "$0: error: couldn't find file $option_value" >&2
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exit 1
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elif [ ! -f "$option_value" ]; then
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show_header
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echo "$0: error: $option_value is not a file" >&2
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exit 1
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elif [ ! -e "$option_value" ]; then
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show_header
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echo "$0: error: couldn't read $option_value (are you root?)" >&2
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exit 1
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fi
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@ -164,21 +201,32 @@ while [ -n "$1" ]; do
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elif [ "$1" = "--no-color" ]; then
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opt_no_color=1
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shift
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elif [ "$1" = "--batch" ]; then
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opt_batch=1
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opt_verbose=0
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shift
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elif [ "$1" = "-v" -o "$1" = "--verbose" ]; then
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opt_verbose=$(expr $opt_verbose + 1)
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shift
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elif [ "$1" = "-h" -o "$1" = "--help" ]; then
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show_header
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show_usage
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exit 0
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else
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show_header
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show_usage
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echo "$0: error: unknown option '$1'"
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exit 1
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fi
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done
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show_header
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# print status function
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pstatus()
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{
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if [ "$opt_no_color" = 1 ]; then
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_echo_nol "$2"
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_info_nol "$2"
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else
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case "$1" in
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red) col="\033[101m\033[30m";;
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@ -187,12 +235,28 @@ pstatus()
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blue) col="\033[104m\033[30m";;
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*) col="";;
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esac
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_echo_nol "$col $2 \033[0m"
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_info_nol "$col $2 \033[0m"
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fi
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[ -n "$3" ] && _echo_nol " ($3)"
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_echo
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[ -n "$3" ] && _info_nol " ($3)"
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_info
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}
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# Print the final status of a vulnerability (incl. batch mode)
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# Arguments are: CVE UNK/OK/VULN description
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pvulnstatus()
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{
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[ "$opt_batch" = 1 ] && _echo 0 "$1: $2 ($3)"
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_info_nol "> \033[46m\033[30mSTATUS:\033[0m "
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vulnstatus="$2"
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shift 2
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case "$vulnstatus" in
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UNK) pstatus yellow UNKNOWN "$@";;
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VULN) pstatus red 'VULNERABLE' "$@";;
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OK) pstatus green 'NOT VULNERABLE' "$@";;
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esac
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}
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# The 3 below functions are taken from the extract-linux script, available here:
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# https://github.com/torvalds/linux/blob/master/scripts/extract-vmlinux
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# The functions have been modified for better integration to this script
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@ -274,12 +338,12 @@ fi
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if [ "$opt_live" = 1 ]; then
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if [ "$(id -u)" -ne 0 ]; then
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_echo "\033[31mNote that you should launch this script with root privileges to get accurate information.\033[0m"
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_echo "\033[31mWe'll proceed but you might see permission denied errors.\033[0m"
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_echo "\033[31mTo run it as root, you can try the following command: sudo $0\033[0m"
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_echo
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_warn "Note that you should launch this script with root privileges to get accurate information."
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_warn "We'll proceed but you might see permission denied errors."
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_warn "To run it as root, you can try the following command: sudo $0"
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_warn
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fi
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_echo "Checking for vulnerabilities against live running kernel \033[35m"$(uname -s) $(uname -r) $(uname -v) $(uname -m)"\033[0m"
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_info "Checking for vulnerabilities against live running kernel \033[35m"$(uname -s) $(uname -r) $(uname -v) $(uname -m)"\033[0m"
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# try to find the image of the current running kernel
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[ -e /boot/vmlinuz-linux ] && opt_kernel=/boot/vmlinuz-linux
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@ -306,24 +370,24 @@ if [ "$opt_live" = 1 ]; then
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opt_config=/boot/config-$(uname -r)
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fi
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else
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_echo "Checking for vulnerabilities against specified kernel"
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_info "Checking for vulnerabilities against specified kernel"
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fi
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if [ -n "$opt_kernel" ]; then
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_echo "Will use vmlinux image \033[35m$opt_kernel\033[0m"
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_verbose "Will use vmlinux image \033[35m$opt_kernel\033[0m"
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else
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_echo "Will use no vmlinux image (accuracy might be reduced)"
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_verbose "Will use no vmlinux image (accuracy might be reduced)"
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fi
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if [ -n "$dumped_config" ]; then
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_echo "Will use kconfig \033[35m/proc/config.gz\033[0m"
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_verbose "Will use kconfig \033[35m/proc/config.gz\033[0m"
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elif [ -n "$opt_config" ]; then
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_echo "Will use kconfig \033[35m$opt_config\033[0m"
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_verbose "Will use kconfig \033[35m$opt_config\033[0m"
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else
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_echo "Will use no kconfig (accuracy might be reduced)"
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_verbose "Will use no kconfig (accuracy might be reduced)"
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fi
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if [ -n "$opt_map" ]; then
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_echo "Will use System.map file \033[35m$opt_map\033[0m"
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_verbose "Will use System.map file \033[35m$opt_map\033[0m"
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else
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_echo "Will use no System.map file (accuracy might be reduced)"
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_verbose "Will use no System.map file (accuracy might be reduced)"
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fi
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if [ -e "$opt_kernel" ]; then
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@ -339,12 +403,12 @@ if [ -z "$vmlinux" -o ! -r "$vmlinux" ]; then
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[ -z "$vmlinux_err" ] && vmlinux_err="couldn't extract your kernel from $opt_kernel"
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fi
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_echo
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_info
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###########
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# SPECTRE 1
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_echo "\033[1;34mCVE-2017-5753 [bounds check bypass] aka 'Spectre Variant 1'\033[0m"
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_echo_nol "* Checking count of LFENCE opcodes in kernel: "
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_info "\033[1;34mCVE-2017-5753 [bounds check bypass] aka 'Spectre Variant 1'\033[0m"
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_info_nol "* Checking count of LFENCE opcodes in kernel: "
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status=0
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if [ -n "$vmlinux_err" ]; then
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@ -370,21 +434,22 @@ else
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fi
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fi
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_echo_nol "> \033[46m\033[30mSTATUS:\033[0m "
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if ! is_cpu_vulnerable 1; then
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pstatus green 'NOT VULNERABLE' "your CPU vendor reported your CPU model as not vulnerable"
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pvulnstatus CVE-2017-5753 OK "your CPU vendor reported your CPU model as not vulnerable"
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else
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[ "$status" = 0 ] && pstatus yellow UNKNOWN
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[ "$status" = 1 ] && pstatus red 'VULNERABLE' 'heuristic to be improved when official patches become available'
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[ "$status" = 2 ] && pstatus green 'NOT VULNERABLE' 'heuristic to be improved when official patches become available'
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case "$status" in
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0) pvulnstatus CVE-2017-5753 UNK "impossible to check ${vmlinux}";;
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1) pvulnstatus CVE-2017-5753 VULN 'heuristic to be improved when official patches become available';;
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2) pvulnstatus CVE-2017-5753 OK 'heuristic to be improved when official patches become available';;
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esac
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fi
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###########
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# VARIANT 2
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_echo
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_echo "\033[1;34mCVE-2017-5715 [branch target injection] aka 'Spectre Variant 2'\033[0m"
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_echo "* Mitigation 1"
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_echo_nol "* Hardware (CPU microcode) support for mitigation: "
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_info
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_info "\033[1;34mCVE-2017-5715 [branch target injection] aka 'Spectre Variant 2'\033[0m"
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_info "* Mitigation 1"
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_info_nol "* Hardware (CPU microcode) support for mitigation: "
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if [ ! -e /dev/cpu/0/msr ]; then
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# try to load the module ourselves (and remember it so we can rmmod it afterwards)
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modprobe msr 2>/dev/null && insmod_msr=1
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@ -408,7 +473,7 @@ if [ "$insmod_msr" = 1 ]; then
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rmmod msr 2>/dev/null
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fi
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_echo_nol "* Kernel support for IBRS: "
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_info_nol "* Kernel support for IBRS: "
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if [ "$opt_live" = 1 ]; then
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if [ ! -e /sys/kernel/debug/sched_features ]; then
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# try to mount the debugfs hierarchy ourselves and remember it to umount afterwards
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@ -436,7 +501,7 @@ if [ "$ibrs_supported" != 1 ]; then
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pstatus red NO
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fi
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_echo_nol "* IBRS enabled for Kernel space: "
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_info_nol "* IBRS enabled for Kernel space: "
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if [ "$opt_live" = 1 ]; then
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# 0 means disabled
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# 1 is enabled only for kernel space
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@ -451,7 +516,7 @@ else
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pstatus blue N/A "not testable in offline mode"
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fi
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_echo_nol "* IBRS enabled for User space: "
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_info_nol "* IBRS enabled for User space: "
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if [ "$opt_live" = 1 ]; then
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case "$ibrs_enabled" in
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"") [ "$ibrs_supported" = 1 ] && pstatus yellow UNKNOWN || pstatus red NO;;
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@ -463,8 +528,8 @@ else
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pstatus blue N/A "not testable in offline mode"
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fi
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_echo "* Mitigation 2"
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_echo_nol "* Kernel compiled with retpoline option: "
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_info "* Mitigation 2"
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_info_nol "* Kernel compiled with retpoline option: "
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# We check the RETPOLINE kernel options
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if [ -r "$opt_config" ]; then
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if grep -q '^CONFIG_RETPOLINE=y' "$opt_config"; then
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@ -477,7 +542,7 @@ else
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pstatus yellow UNKNOWN "couldn't read your kernel configuration"
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fi
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_echo_nol "* Kernel compiled with a retpoline-aware compiler: "
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_info_nol "* Kernel compiled with a retpoline-aware compiler: "
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# Now check if the compiler used to compile the kernel knows how to insert retpolines in generated asm
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# For gcc, this is -mindirect-branch=thunk-extern (detected by the kernel makefiles)
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# See gcc commit https://github.com/hjl-tools/gcc/commit/23b517d4a67c02d3ef80b6109218f2aadad7bd79
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@ -513,30 +578,29 @@ else
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pstatus yellow UNKNOWN "couldn't find your kernel image or System.map"
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fi
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_echo_nol "> \033[46m\033[30mSTATUS:\033[0m "
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if ! is_cpu_vulnerable 2; then
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pstatus green 'NOT VULNERABLE' "your CPU vendor reported your CPU model as not vulnerable"
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pvulnstatus CVE-2017-5715 OK "your CPU vendor reported your CPU model as not vulnerable"
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elif [ "$retpoline" = 1 -a "$retpoline_compiler" = 1 ]; then
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pstatus green "NOT VULNERABLE" "retpoline mitigate the vulnerability"
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pvulnstatus CVE-2017-5715 OK "retpoline mitigate the vulnerability"
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elif [ "$opt_live" = 1 ]; then
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if [ "$ibrs_enabled" = 1 -o "$ibrs_enabled" = 2 ]; then
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pstatus green "NOT VULNERABLE" "IBRS mitigates the vulnerability"
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pvulnstatus CVE-2017-5715 OK "IBRS mitigates the vulnerability"
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else
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pstatus red VULNERABLE "IBRS hardware + kernel support OR kernel with retpoline are needed to mitigate the vulnerability"
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pvulnstatus CVE-2017-5715 VULN "IBRS hardware + kernel support OR kernel with retpoline are needed to mitigate the vulnerability"
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fi
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else
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if [ "$ibrs_supported" = 1 ]; then
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pstatus green "NOT VULNERABLE" "offline mode: IBRS will mitigate the vulnerability if enabled at runtime"
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pvulnstatus CVE-2017-5715 OK "offline mode: IBRS will mitigate the vulnerability if enabled at runtime"
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else
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pstatus red VULNERABLE "IBRS hardware + kernel support OR kernel with retpoline are needed to mitigate the vulnerability"
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pvulnstatus CVE-2017-5715 VULN "IBRS hardware + kernel support OR kernel with retpoline are needed to mitigate the vulnerability"
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fi
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fi
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##########
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# MELTDOWN
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_echo
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_echo "\033[1;34mCVE-2017-5754 [rogue data cache load] aka 'Meltdown' aka 'Variant 3'\033[0m"
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_echo_nol "* Kernel supports Page Table Isolation (PTI): "
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_info
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_info "\033[1;34mCVE-2017-5754 [rogue data cache load] aka 'Meltdown' aka 'Variant 3'\033[0m"
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_info_nol "* Kernel supports Page Table Isolation (PTI): "
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kpti_support=0
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kpti_can_tell=0
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if [ -n "$opt_config" ]; then
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@ -574,7 +638,7 @@ else
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pstatus yellow UNKNOWN "couldn't read your kernel configuration nor System.map file"
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fi
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_echo_nol "* PTI enabled and active: "
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_info_nol "* PTI enabled and active: "
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if [ "$opt_live" = 1 ]; then
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if grep ^flags /proc/cpuinfo | grep -qw pti; then
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# vanilla PTI patch sets the 'pti' flag in cpuinfo
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@ -605,23 +669,22 @@ if [ "$mounted_debugfs" = 1 ]; then
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umount /sys/kernel/debug
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fi
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_echo_nol "> \033[46m\033[30mSTATUS:\033[0m "
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if ! is_cpu_vulnerable 3; then
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pstatus green 'NOT VULNERABLE' "your CPU vendor reported your CPU model as not vulnerable"
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pvulnstatus CVE-2017-5754 OK "your CPU vendor reported your CPU model as not vulnerable"
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elif [ "$opt_live" = 1 ]; then
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if [ "$kpti_enabled" = 1 ]; then
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pstatus green "NOT VULNERABLE" "PTI mitigates the vulnerability"
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pvulnstatus CVE-2017-5754 OK "PTI mitigates the vulnerability"
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else
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pstatus red "VULNERABLE" "PTI is needed to mitigate the vulnerability"
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pvulnstatus CVE-2017-5754 VULN "PTI is needed to mitigate the vulnerability"
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fi
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else
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if [ "$kpti_support" = 1 ]; then
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pstatus green "NOT VULNERABLE" "offline mode: PTI will mitigate the vulnerability if enabled at runtime"
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pvulnstatus CVE-2017-5754 OK "offline mode: PTI will mitigate the vulnerability if enabled at runtime"
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else
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pstatus red "VULNERABLE" "PTI is needed to mitigate the vulnerability"
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pvulnstatus CVE-2017-5754 VULN "PTI is needed to mitigate the vulnerability"
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fi
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fi
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_echo
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_info
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[ -n "$dumped_config" ] && rm -f "$dumped_config"
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