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feat: speed up kernel version detection

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This commit is contained in:
Stéphane Lesimple 2018-03-25 13:42:06 +02:00
parent 0b8a09ec70
commit aa74315df4
1 changed files with 43 additions and 45 deletions
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88
spectre-meltdown-checker.sh
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@ -1198,19 +1198,17 @@ fi
if [ -z "$vmlinux" ] || [ ! -r "$vmlinux" ]; then
[ -z "$vmlinux_err" ] && vmlinux_err="couldn't extract your kernel from $opt_kernel"
else
vmlinux_version=$("${opt_arch_prefix}strings" "$vmlinux" 2>/dev/null | grep '^Linux version ' | head -1)
if [ -z "$vmlinux_version" ]; then
# try harder with some kernels (such as Red Hat) that don't have ^Linux version before their version string
vmlinux_version=$("${opt_arch_prefix}strings" "$vmlinux" 2>/dev/null | grep -E '^[[:alnum:]][^[:space:]]+ \([^[:space:]]+\) #[0-9]+ .+ (19|20)[0-9][0-9]$' | head -1)
fi
# vanilla kernels have with ^Linux version
# also try harder with some kernels (such as Red Hat) that don't have ^Linux version before their version string
# and check for FreeBSD
vmlinux_version=$("${opt_arch_prefix}strings" "$vmlinux" 2>/dev/null | grep -E \
-e '^Linux version ' \
-e '^[[:alnum:]][^[:space:]]+ \([^[:space:]]+\) #[0-9]+ .+ (19|20)[0-9][0-9]$' \
-e '^FreeBSD [0-9]' | head -1)
if [ -z "$vmlinux_version" ]; then
# try even harder with some kernels (such as ARM) that split the release (uname -r) and version (uname -v) in 2 adjacent strings
vmlinux_version=$("${opt_arch_prefix}strings" "$vmlinux" 2>/dev/null | grep -E -B1 '^#[0-9]+ .+ (19|20)[0-9][0-9]$' | tr "\n" " ")
fi
if [ -z "$vmlinux_version" ]; then
# FreeBSD?
vmlinux_version=$("${opt_arch_prefix}strings" "$vmlinux" 2>/dev/null | grep -E '^FreeBSD [0-9]' | head -1)
fi
if [ -n "$vmlinux_version" ]; then
# in live mode, check if the img we found is the correct one
if [ "$opt_live" = 1 ]; then
@ -1248,10 +1246,10 @@ sys_interface_check()
elif grep -qi '^vulnerable' "$1"; then
# Vulnerable
status=VULN
pstatus red NO "kernel confirms your system is vulnerable"
pstatus yellow NO "kernel confirms your system is vulnerable"
else
status=UNK
pstatus yellow UNKNOWN "unknown value reported by kernel"
pstatus blue UNKNOWN "unknown value reported by kernel"
fi
msg=$(cat "$1")
_debug "sys_interface_check: $1=$msg"
@ -1333,7 +1331,7 @@ check_cpu()
fi
if [ ! -e /dev/cpu/0/msr ] && [ ! -e /dev/cpuctl0 ]; then
spec_ctrl_msr=-1
pstatus yellow UNKNOWN "is msr kernel module available?"
pstatus blue UNKNOWN "is msr kernel module available?"
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
@ -1364,7 +1362,7 @@ check_cpu()
fi
else
spec_ctrl_msr=0
pstatus red NO
pstatus yellow NO
fi
fi
@ -1375,9 +1373,9 @@ check_cpu()
pstatus green YES "SPEC_CTRL feature bit"
cpuid_spec_ctrl=1
elif [ $ret -eq 2 ]; then
pstatus yellow UNKNOWN "is cpuid kernel module available?"
pstatus blue UNKNOWN "is cpuid kernel module available?"
else
pstatus red NO
pstatus yellow NO
fi
# hardware support according to kernel
@ -1429,7 +1427,7 @@ check_cpu()
pstatus green YES "But not in all CPUs"
fi
else
pstatus red NO
pstatus yellow NO
fi
fi
@ -1443,7 +1441,7 @@ check_cpu()
elif [ $ret -eq 2 ]; then
pstatus yellow UNKNOWN "is cpuid kernel module available?"
else
pstatus red NO
pstatus yellow NO
fi
# STIBP
@ -1452,7 +1450,7 @@ check_cpu()
if [ "$spec_ctrl_msr" = 1 ]; then
pstatus green YES
elif [ "$spec_ctrl_msr" = 0 ]; then
pstatus red NO
pstatus yellow NO
else
pstatus yellow UNKNOWN "is cpuid kernel module available?"
fi
@ -1465,7 +1463,7 @@ check_cpu()
elif [ $ret -eq 2 ]; then
pstatus yellow UNKNOWN "is cpuid kernel module available?"
else
pstatus red NO
pstatus yellow NO
fi
_info " * Enhanced IBRS (IBRS_ALL)"
@ -1479,7 +1477,7 @@ check_cpu()
elif [ $ret -eq 2 ]; then
pstatus yellow UNKNOWN "is cpuid kernel module available?"
else
pstatus red NO
pstatus yellow NO
cpuid_arch_capabilities=0
fi
@ -1491,7 +1489,7 @@ check_cpu()
elif [ "$cpuid_arch_capabilities" != 1 ]; then
capabilities_rdcl_no=0
capabilities_ibrs_all=0
pstatus red NO
pstatus yellow NO
elif [ ! -e /dev/cpu/0/msr ] && [ ! -e /dev/cpuctl0 ]; then
spec_ctrl_msr=-1
pstatus yellow UNKNOWN "is msr kernel module available?"
@ -1532,7 +1530,7 @@ check_cpu()
pstatus green YES "But not in all CPUs"
fi
else
pstatus red NO
pstatus yellow NO
fi
else
pstatus yellow UNKNOWN
@ -1659,7 +1657,7 @@ check_variant1_linux()
pstatus green YES "$ret occurence(s) found of 32 bits array_index_mask_nospec()"
v1_mask_nospec=1
else
pstatus red NO
pstatus yellow NO
fi
fi
fi
@ -1675,7 +1673,7 @@ check_variant1_linux()
elif [ "$redhat_canonical_spectre" = 2 ]; then
pstatus green YES "but without IBRS"
else
pstatus red NO
pstatus yellow NO
fi
if [ "$opt_verbose" -ge 2 ] || ( [ "$v1_mask_nospec" != 1 ] && [ "$redhat_canonical_spectre" != 1 ] && [ "$redhat_canonical_spectre" != 2 ] ); then
@ -1697,7 +1695,7 @@ check_variant1_linux()
# non patched kernel have between 0 and 20 matches, patched ones have at least 40-45
nb_lfence=$("${opt_arch_prefix}objdump" -d "$vmlinux" 2>/dev/null | grep -w -B1 lfence | grep -Ewc 'jmp|jne|je')
if [ "$nb_lfence" -lt 30 ]; then
pstatus red NO "only $nb_lfence jump-then-lfence instructions found, should be >= 30 (heuristic)"
pstatus yellow NO "only $nb_lfence jump-then-lfence instructions found, should be >= 30 (heuristic)"
else
v1_lfence=1
pstatus green YES "$nb_lfence jump-then-lfence instructions found, which is >= 30 (heuristic)"
@ -1840,7 +1838,7 @@ check_variant2_linux()
fi
if [ "$ibrs_supported" != 1 ]; then
if [ "$ibrs_can_tell" = 1 ]; then
pstatus red NO
pstatus yellow NO
else
# if we're in offline mode without System.map, we can't really know
pstatus yellow UNKNOWN "in offline mode, we need System.map to be able to tell"
@ -1862,11 +1860,11 @@ check_variant2_linux()
if [ "$ibrs_supported" = 1 ]; then
pstatus yellow UNKNOWN
else
pstatus red NO
pstatus yellow NO
fi
;;
0)
pstatus red NO
pstatus yellow NO
_verbose " - To enable, \`echo 1 > $ibrs_knob_dir/ibrs_enabled' as root. If you don't have hardware support, you'll get an error."
;;
1 | 2) pstatus green YES;;
@ -1888,11 +1886,11 @@ check_variant2_linux()
if [ "$ibrs_supported" = 1 ]; then
pstatus yellow UNKNOWN
else
pstatus red NO
pstatus yellow NO
fi
;;
0 | 1)
pstatus red NO
pstatus yellow NO
_verbose " - To enable, \`echo 2 > $ibrs_knob_dir/ibrs_enabled' as root. If you don't have hardware support, you'll get an error."
;;
2) pstatus green YES;;
@ -1910,11 +1908,11 @@ check_variant2_linux()
if [ "$ibrs_supported" = 1 ]; then
pstatus yellow UNKNOWN
else
pstatus red NO
pstatus yellow NO
fi
;;
0)
pstatus red NO
pstatus yellow NO
_verbose " - To enable, \`echo 1 > $ibrs_knob_dir/ibpb_enabled' as root. If you don't have hardware support, you'll get an error."
;;
1) pstatus green YES;;
@ -1935,7 +1933,7 @@ check_variant2_linux()
# shellcheck disable=SC2046
_debug 'retpoline: found '$(grep '^CONFIG_RETPOLINE' "$opt_config")" in $opt_config"
else
pstatus red NO
pstatus yellow NO
fi
else
pstatus yellow UNKNOWN "couldn't read your kernel configuration"
@ -1949,7 +1947,7 @@ check_variant2_linux()
# *AND* if the compiler is retpoline-compliant, so look for that symbol
if [ -e "/sys/devices/system/cpu/vulnerabilities/spectre_v2" ]; then
if grep -qw Minimal /sys/devices/system/cpu/vulnerabilities/spectre_v2; then
pstatus red NO "kernel reports minimal retpoline compilation"
pstatus yellow NO "kernel reports minimal retpoline compilation"
elif grep -qw Full /sys/devices/system/cpu/vulnerabilities/spectre_v2; then
retpoline_compiler=1
pstatus green YES "kernel reports full retpoline compilation"
@ -1957,7 +1955,7 @@ check_variant2_linux()
if [ "$retpoline" = 1 ]; then
pstatus yellow UNKNOWN
else
pstatus red NO
pstatus yellow NO
fi
fi
elif [ -n "$opt_map" ]; then
@ -1969,7 +1967,7 @@ check_variant2_linux()
if [ "$retpoline" = 1 ]; then
pstatus yellow UNKNOWN
else
pstatus red NO
pstatus yellow NO
fi
fi
elif [ -n "$vmlinux" ]; then
@ -1983,7 +1981,7 @@ check_variant2_linux()
if [ "$retpoline" = 1 ]; then
pstatus yellow UNKNOWN
else
pstatus red NO
pstatus yellow NO
fi
fi
elif grep -q noretpoline_setup "$vmlinux"; then
@ -1995,14 +1993,14 @@ check_variant2_linux()
if [ "$retpoline" = 1 ]; then
pstatus yellow UNKNOWN
else
pstatus red NO
pstatus yellow NO
fi
fi
else
if [ "$retpoline" = 1 ]; then
pstatus yellow UNKNOWN "couldn't find your kernel image or System.map"
else
pstatus red NO
pstatus yellow NO
fi
fi
elif [ "$sys_interface_available" = 0 ]; then
@ -2052,7 +2050,7 @@ 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
pstatus yellow NO
else
pstatus green YES
fi
@ -2062,7 +2060,7 @@ check_variant2_bsd()
if [ "$ibrs_active" = 1 ]; then
pstatus green YES
else
pstatus red NO
pstatus yellow NO
fi
cve='CVE-2017-5715'
@ -2141,7 +2139,7 @@ check_variant3_linux()
if [ "$kpti_support" = 1 ]; then
pstatus green YES
elif [ "$kpti_can_tell" = 1 ]; then
pstatus red NO
pstatus yellow NO
else
pstatus yellow UNKNOWN "couldn't read your kernel configuration nor System.map file"
fi
@ -2184,7 +2182,7 @@ check_variant3_linux()
elif [ "$kpti_enabled" = -1 ]; then
pstatus yellow UNKNOWN "dmesg truncated, please reboot and relaunch this script"
else
pstatus red NO
pstatus yellow NO
fi
else
pstatus blue N/A "can't verify if PTI is enabled in offline mode"
@ -2302,7 +2300,7 @@ 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
pstatus yellow NO
else
pstatus green YES
fi
@ -2311,7 +2309,7 @@ check_variant3_bsd()
if [ "$kpti_enabled" = 1 ]; then
pstatus green YES
else
pstatus red NO
pstatus yellow NO
fi
cve='CVE-2017-5754'