mirror of
https://github.com/speed47/spectre-meltdown-checker.git
synced 2024-12-05 02:38:04 +01:00
chore: more shellcheck 0.6 fixes
This commit is contained in:
Stéphane Lesimple
parent
7beca1ac50
commit
1264b1c7a3
@ -31,7 +31,7 @@ exit_cleanup()
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}
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# if we were git clone'd, adjust VERSION
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if [ -d "$(dirname "$0")/.git" ] && which git >/dev/null 2>&1; then
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if [ -d "$(dirname "$0")/.git" ] && command -v git >/dev/null 2>&1; then
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describe=$(git -C "$(dirname "$0")" describe --tags --dirty 2>/dev/null)
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[ -n "$describe" ] && VERSION=$(echo "$describe" | sed -e s/^v//)
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fi
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@ -159,8 +159,12 @@ supported_cve_list='CVE-2017-5753 CVE-2017-5715 CVE-2017-5754 CVE-2018-3640 CVE-
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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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echo_cmd_type='echo'
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if which printf >/dev/null 2>&1; then
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echo_cmd=$(which printf)
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# ignore SC2230 here because `which` ignores builtins while `command -v` doesn't, and
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# we don't want builtins here. Even if `which` is not installed, we'll fallback to the
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# `echo` builtin anyway, so this is safe.
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# shellcheck disable=SC2230
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if command -v printf >/dev/null 2>&1; then
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echo_cmd=$(command -v 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=$(which echo)
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@ -465,7 +469,7 @@ is_cpu_vulnerable()
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[ -z "$variant3a" ] && variant3a=immune
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variant4=vuln
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_debug "checking cpu$i: armv8 A76 non vulnerable to variant 2, 3 & 3a"
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elif [ "$cpuarch" -le 7 ] || ( [ "$cpuarch" = 8 ] && [ $(( cpupart )) -lt $(( 0xd07 )) ] ) ; then
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elif [ "$cpuarch" -le 7 ] || { [ "$cpuarch" = 8 ] && [ $(( cpupart )) -lt $(( 0xd07 )) ]; } ; then
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[ -z "$variant1" ] && variant1=immune
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[ -z "$variant2" ] && variant2=immune
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[ -z "$variant3" ] && variant3=immune
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@ -603,11 +607,11 @@ update_mcedb()
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mcedb_tmp="$(mktemp /tmp/mcedb-XXXXXX)"
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mcedb_url='https://github.com/platomav/MCExtractor/raw/master/MCE.db'
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_info_nol "Fetching MCE.db from the MCExtractor project... "
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if which wget >/dev/null 2>&1; then
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if command -v wget >/dev/null 2>&1; then
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wget -q "$mcedb_url" -O "$mcedb_tmp"; ret=$?
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elif which curl >/dev/null 2>&1; then
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elif command -v curl >/dev/null 2>&1; then
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curl -sL "$mcedb_url" -o "$mcedb_tmp"; ret=$?
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elif which fetch >/dev/null 2>&1; then
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elif command -v fetch >/dev/null 2>&1; then
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fetch -q "$mcedb_url" -o "$mcedb_tmp"; ret=$?
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else
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echo ERROR "please install one of \`wget\`, \`curl\` of \`fetch\` programs"
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@ -621,7 +625,7 @@ update_mcedb()
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# now extract contents using sqlite
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_info_nol "Extracting data... "
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if ! which sqlite3 >/dev/null 2>&1; then
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if ! command -v sqlite3 >/dev/null 2>&1; then
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echo ERROR "please install the \`sqlite3\` program"
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return 1
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fi
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@ -888,6 +892,7 @@ pvulnstatus()
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prometheus)
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prometheus_output="${prometheus_output:+$prometheus_output\n}specex_vuln_status{name=\"$aka\",cve=\"$1\",status=\"$2\",info=\"$3\"} 1"
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;;
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*) echo "$0: error: invalid batch format '$opt_batch_format' specified" >&2; exit 255;;
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esac
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fi
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@ -972,7 +977,7 @@ try_decompress()
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for pos in $(tr "$1\n$2" "\n$2=" < "$6" | grep -abo "^$2")
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do
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_debug "try_decompress: magic for $3 found at offset $pos"
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if ! which "$3" >/dev/null 2>&1; then
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if ! command -v "$3" >/dev/null 2>&1; then
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kernel_err="missing '$3' tool, please install it, usually it's in the '$5' package"
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return 0
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fi
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@ -1165,7 +1170,7 @@ dmesg_grep()
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is_coreos()
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{
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which coreos-install >/dev/null 2>&1 && which toolbox >/dev/null 2>&1 && return 0
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command -v coreos-install >/dev/null 2>&1 && command -v toolbox >/dev/null 2>&1 && return 0
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return 1
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}
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@ -1679,7 +1684,7 @@ if [ "$os" = Linux ]; then
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fi
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if [ -e "$opt_kernel" ]; then
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if ! which "${opt_arch_prefix}readelf" >/dev/null 2>&1; then
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if ! command -v "${opt_arch_prefix}readelf" >/dev/null 2>&1; then
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_debug "readelf not found"
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kernel_err="missing '${opt_arch_prefix}readelf' tool, please install it, usually it's in the 'binutils' package"
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elif [ "$opt_sysfs_only" = 1 ] || [ "$opt_hw_only" = 1 ]; then
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@ -1790,11 +1795,11 @@ write_msr()
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if [ ! -w /dev/cpu/"$_cpu"/msr ]; then
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ret=200 # permission error
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# if wrmsr is available, use it
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elif which wrmsr >/dev/null 2>&1 && [ "$SMC_NO_WRMSR" != 1 ]; then
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elif command -v wrmsr >/dev/null 2>&1 && [ "$SMC_NO_WRMSR" != 1 ]; then
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_debug "write_msr: using wrmsr"
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wrmsr $_msr 0 2>/dev/null; ret=$?
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# or if we have perl, use it, any 5.x version will work
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elif which perl >/dev/null 2>&1 && [ "$SMC_NO_PERL" != 1 ]; then
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elif command -v perl >/dev/null 2>&1 && [ "$SMC_NO_PERL" != 1 ]; then
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_debug "write_msr: using perl"
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ret=1
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perl -e "open(M,'>','/dev/cpu/$_cpu/msr') and seek(M,$_msr,0) and exit(syswrite(M,pack('H16',0)))"; [ $? -eq 8 ] && ret=0
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@ -1836,11 +1841,11 @@ read_msr()
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if [ ! -r /dev/cpu/"$_cpu"/msr ]; then
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return 200 # permission error
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# if rdmsr is available, use it
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elif which rdmsr >/dev/null 2>&1 && [ "$SMC_NO_RDMSR" != 1 ]; then
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elif command -v rdmsr >/dev/null 2>&1 && [ "$SMC_NO_RDMSR" != 1 ]; then
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_debug "read_msr: using rdmsr"
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read_msr_value=$(rdmsr -r $_msr 2>/dev/null | od -t u8 -A n)
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# or if we have perl, use it, any 5.x version will work
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elif which perl >/dev/null 2>&1 && [ "$SMC_NO_PERL" != 1 ]; then
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elif command -v perl >/dev/null 2>&1 && [ "$SMC_NO_PERL" != 1 ]; then
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_debug "read_msr: using perl"
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read_msr_value=$(perl -e "open(M,'<','/dev/cpu/$_cpu/msr') and seek(M,$_msr,0) and read(M,\$_,8) and print" | od -t u8 -A n)
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# fallback to dd if it supports skip_bytes
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@ -2376,7 +2381,7 @@ check_redhat_canonical_spectre()
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# if we were already called, don't do it again
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[ -n "$redhat_canonical_spectre" ] && return
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if ! which "${opt_arch_prefix}strings" >/dev/null 2>&1; then
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if ! command -v "${opt_arch_prefix}strings" >/dev/null 2>&1; then
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redhat_canonical_spectre=-1
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elif [ -n "$kernel_err" ]; then
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redhat_canonical_spectre=-2
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@ -2460,7 +2465,7 @@ check_CVE_2017_5753_linux()
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# http://git.arm.linux.org.uk/cgit/linux-arm.git/commit/?h=spectre&id=a78d156587931a2c3b354534aa772febf6c9e855
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if [ -n "$kernel_err" ]; then
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pstatus yellow UNKNOWN "couldn't check ($kernel_err)"
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elif ! which perl >/dev/null 2>&1; then
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elif ! command -v perl >/dev/null 2>&1; then
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pstatus yellow UNKNOWN "missing 'perl' binary, please install it"
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else
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perl -ne '/\x0f\x83....\x48\x19\xd2\x48\x21\xd0/ and $found++; END { exit($found) }' "$kernel"; ret=$?
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@ -2517,9 +2522,9 @@ check_CVE_2017_5753_linux()
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pstatus yellow NO
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elif [ -n "$kernel_err" ]; then
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pstatus yellow UNKNOWN "couldn't check ($kernel_err)"
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elif ! which perl >/dev/null 2>&1; then
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elif ! command -v perl >/dev/null 2>&1; then
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pstatus yellow UNKNOWN "missing 'perl' binary, please install it"
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elif ! which "${opt_arch_prefix}objdump" >/dev/null 2>&1; then
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elif ! command -v "${opt_arch_prefix}objdump" >/dev/null 2>&1; then
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pstatus yellow UNKNOWN "missing '${opt_arch_prefix}objdump' tool, please install it, usually it's in the binutils package"
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else
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"${opt_arch_prefix}objdump" -d "$kernel" | perl -ne 'push @r, $_; /\s(hint|csdb)\s/ && $r[0]=~/\ssub\s+(x\d+)/ && $r[1]=~/\sbic\s+$1,\s+$1,/ && $r[2]=~/\sand\s/ && exit(9); shift @r if @r>3'; ret=$?
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@ -2531,14 +2536,14 @@ check_CVE_2017_5753_linux()
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fi
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fi
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if [ "$opt_verbose" -ge 2 ] || ( [ -z "$v1_mask_nospec" ] && [ "$redhat_canonical_spectre" != 1 ] && [ "$redhat_canonical_spectre" != 2 ] ); then
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if [ "$opt_verbose" -ge 2 ] || { [ -z "$v1_mask_nospec" ] && [ "$redhat_canonical_spectre" != 1 ] && [ "$redhat_canonical_spectre" != 2 ]; }; then
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# this is a slow heuristic and we don't need it if we already know the kernel is patched
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# but still show it in verbose mode
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_info_nol "* Checking count of LFENCE instructions following a jump in kernel... "
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if [ -n "$kernel_err" ]; then
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pstatus yellow UNKNOWN "couldn't check ($kernel_err)"
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else
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if ! which "${opt_arch_prefix}objdump" >/dev/null 2>&1; then
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if ! command -v "${opt_arch_prefix}objdump" >/dev/null 2>&1; then
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pstatus yellow UNKNOWN "missing '${opt_arch_prefix}objdump' tool, please install it, usually it's in the binutils package"
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else
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# here we disassemble the kernel and count the number of occurrences of the LFENCE opcode
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@ -2577,7 +2582,7 @@ check_CVE_2017_5753_linux()
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pvulnstatus $cve OK "Kernel source has been patched to mitigate the vulnerability (Red Hat/Ubuntu patch)"
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elif [ "$v1_lfence" = 1 ]; then
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pvulnstatus $cve OK "Kernel source has PROBABLY been patched to mitigate the vulnerability (jump-then-lfence instructions heuristic)"
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elif [ "$kernel_err" ]; then
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elif [ -n "$kernel_err" ]; then
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pvulnstatus $cve UNK "Couldn't find kernel image or tools missing to execute the checks"
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explain "Re-run this script with root privileges, after installing the missing tools indicated above"
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else
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@ -2722,7 +2727,7 @@ check_CVE_2017_5715_linux()
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fi
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fi
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if [ -z "$ibrs_supported" ] && [ -n "$kernel" ]; then
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if ! which "${opt_arch_prefix}strings" >/dev/null 2>&1; then
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if ! command -v "${opt_arch_prefix}strings" >/dev/null 2>&1; then
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:
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else
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ibrs_can_tell=1
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@ -2743,7 +2748,7 @@ check_CVE_2017_5715_linux()
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# recent (4.15) vanilla kernels have IBPB but not IBRS, and without the debugfs tunables of Red Hat
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# we can detect it directly in the image
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if [ -z "$ibpb_supported" ] && [ -n "$kernel" ]; then
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if ! which "${opt_arch_prefix}strings" >/dev/null 2>&1; then
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if ! command -v "${opt_arch_prefix}strings" >/dev/null 2>&1; then
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:
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else
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ibpb_can_tell=1
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@ -2907,7 +2912,7 @@ check_CVE_2017_5715_linux()
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fi
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elif [ -n "$kernel" ]; then
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# look for the symbol
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if which "${opt_arch_prefix}nm" >/dev/null 2>&1; then
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if command -v "${opt_arch_prefix}nm" >/dev/null 2>&1; then
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# the proper way: use nm and look for the symbol
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if "${opt_arch_prefix}nm" "$kernel" 2>/dev/null | grep -qw 'noretpoline_setup'; then
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retpoline_compiler=1
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@ -2955,7 +2960,7 @@ check_CVE_2017_5715_linux()
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# only for information, in verbose mode
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if [ "$opt_verbose" -ge 2 ]; then
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_info_nol " * Local gcc is retpoline-aware: "
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if which gcc >/dev/null 2>&1; then
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if command -v gcc >/dev/null 2>&1; then
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if [ -n "$(gcc -mindirect-branch=thunk-extern --version 2>&1 >/dev/null)" ]; then
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pstatus blue NO
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else
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@ -2968,7 +2973,7 @@ check_CVE_2017_5715_linux()
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if is_vulnerable_to_empty_rsb || [ "$opt_verbose" -ge 2 ]; then
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_info_nol " * Kernel supports RSB filling: "
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if ! which "${opt_arch_prefix}strings" >/dev/null 2>&1; then
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if ! command -v "${opt_arch_prefix}strings" >/dev/null 2>&1; then
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pstatus yellow UNKNOWN "missing '${opt_arch_prefix}strings' tool, please install it, usually it's in the binutils package"
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elif [ -z "$kernel" ]; then
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pstatus yellow UNKNOWN "kernel image missing"
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@ -3048,7 +3053,7 @@ check_CVE_2017_5715_linux()
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if [ "$opt_live" = 1 ] && [ "$vulnstatus" != "OK" ]; then
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_explain_hypervisor="An updated CPU microcode will have IBRS/IBPB capabilities indicated in the Hardware Check section above. If you're running under a hypervisor (KVM, Xen, VirtualBox, VMware, ...), the hypervisor needs to be up to date to be able to export the new host CPU flags to the guest. You can run this script on the host to check if the host CPU is IBRS/IBPB. If it is, and it doesn't show up in the guest, upgrade the hypervisor. You may need to reconfigure your VM to use a CPU model that has IBRS capability; in Libvirt, such CPUs are listed with an IBRS suffix."
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# IBPB (amd & intel)
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if ( [ -z "$ibpb_enabled" ] || [ "$ibpb_enabled" = 0 ] ) && ( is_intel || is_amd || is_hygon); then
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if { [ -z "$ibpb_enabled" ] || [ "$ibpb_enabled" = 0 ]; } && { is_intel || is_amd || is_hygon; }; then
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if [ -z "$cpuid_ibpb" ]; then
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explain "The microcode of your CPU needs to be upgraded to be able to use IBPB. This is usually done at boot time by your kernel (the upgrade is not persistent across reboots which is why it's done at each boot). If you're using a distro, make sure you are up to date, as microcode updates are usually shipped alongside with the distro kernel. Availability of a microcode update for you CPU model depends on your CPU vendor. You can usually find out online if a microcode update is available for your CPU by searching for your CPUID (indicated in the Hardware Check section). $_explain_hypervisor"
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fi
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@ -3073,7 +3078,7 @@ check_CVE_2017_5715_linux()
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# /IBPB
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# IBRS (amd & intel)
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if ( [ -z "$ibrs_enabled" ] || [ "$ibrs_enabled" = 0 ] ) && ( is_intel || is_amd || is_hygon); then
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if { [ -z "$ibrs_enabled" ] || [ "$ibrs_enabled" = 0 ]; } && { is_intel || is_amd || is_hygon; }; then
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if [ -z "$cpuid_ibrs" ]; then
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explain "The microcode of your CPU needs to be upgraded to be able to use IBRS. This is usually done at boot time by your kernel (the upgrade is not persistent across reboots which is why it's done at each boot). If you're using a distro, make sure you are up to date, as microcode updates are usually shipped alongside with the distro kernel. Availability of a microcode update for you CPU model depends on your CPU vendor. You can usually find out online if a microcode update is available for your CPU by searching for your CPUID (indicated in the Hardware Check section). $_explain_hypervisor"
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fi
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@ -3149,7 +3154,7 @@ check_CVE_2017_5715_bsd()
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if [ -n "$kernel_err" ]; then
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pstatus yellow UNKNOWN "couldn't check ($kernel_err)"
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else
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if ! which "${opt_arch_prefix}readelf" >/dev/null 2>&1; then
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if ! command -v "${opt_arch_prefix}readelf" >/dev/null 2>&1; then
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pstatus yellow UNKNOWN "missing '${opt_arch_prefix}readelf' tool, please install it, usually it's in the binutils package"
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else
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nb_thunks=$("${opt_arch_prefix}readelf" -s "$kernel" | grep -c -e __llvm_retpoline_ -e __llvm_external_retpoline_ -e __x86_indirect_thunk_)
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@ -3265,7 +3270,7 @@ check_CVE_2017_5754_linux()
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# nopti option that is part of the patch (kernel command line option)
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# 'kpti=': arm
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kpti_can_tell=1
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if ! which "${opt_arch_prefix}strings" >/dev/null 2>&1; then
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if ! command -v "${opt_arch_prefix}strings" >/dev/null 2>&1; then
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pstatus yellow UNKNOWN "missing '${opt_arch_prefix}strings' tool, please install it, usually it's in the binutils package"
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else
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kpti_support=$("${opt_arch_prefix}strings" "$kernel" | grep -w -e nopti -e kpti=)
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@ -3730,7 +3735,7 @@ check_CVE_2018_3620_linux()
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fi
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if [ "$opt_sysfs_only" != 1 ]; then
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_info_nol "* Kernel supports PTE inversion: "
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if ! which "${opt_arch_prefix}strings" >/dev/null 2>&1; then
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if ! command -v "${opt_arch_prefix}strings" >/dev/null 2>&1; then
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pteinv_supported=-1
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else
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if "${opt_arch_prefix}strings" "$kernel" | grep -Fq 'PTE Inversion'; then
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@ -3919,7 +3924,7 @@ check_CVE_2018_3646_linux()
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l1d_kernel="found flush_l1d in $procfs/cpuinfo"
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fi
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if [ -z "$l1d_kernel" ]; then
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if ! which "${opt_arch_prefix}strings" >/dev/null 2>&1; then
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if ! command -v "${opt_arch_prefix}strings" >/dev/null 2>&1; then
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l1d_kernel_err="missing '${opt_arch_prefix}strings' tool, please install it, usually it's in the binutils package"
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elif [ -n "$kernel_err" ]; then
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l1d_kernel_err="$kernel_err"
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