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https://github.com/speed47/spectre-meltdown-checker
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CVE-2021-26341 Straight-line Speculation (SLS) detection of mitigation
The ability to mitigate against this vulnerability was added to the kernel in Jan 2022 (https://lore.kernel.org/lkml/Yd8o%2FhxM%2FOH3mdQR@zn.tnic/) Detection is via kernel .config, as this mitigation is not reported in /sys SLS affects AMD CPUs from Athlon XP through to Ryzen 5000 and EPYC server processors (https://www.amd.com/en/corporate/product-security/bulletin/amd-sb-1026) Signed-off-by: Rob Gill <rrobgill@protonmail.com>
This commit is contained in:
Rob Gill
parent
a2843575be
commit
eb53c24093
4
.github/workflows/check.yml
vendored
4
.github/workflows/check.yml
vendored
@ -24,7 +24,7 @@ jobs:
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fi
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- name: check direct execution
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run: |
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expected=15
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expected=16
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nb=$(sudo ./spectre-meltdown-checker.sh --batch json | jq '.[]|.CVE' | wc -l)
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if [ "$nb" -ne "$expected" ]; then
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echo "Invalid number of CVEs reported: $nb instead of $expected"
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@ -34,7 +34,7 @@ jobs:
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fi
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- name: check docker-compose run execution
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run: |
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expected=15
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expected=16
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docker-compose build
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nb=$(docker-compose run --rm spectre-meltdown-checker --batch json | jq '.[]|.CVE' | wc -l)
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if [ "$nb" -ne "$expected" ]; then
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@ -20,6 +20,7 @@ CVE
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[CVE-2019-11135](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-11135) | TSX asynchronous abort | TAA, ZombieLoad V2
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[CVE-2018-12207](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-12207) | Machine Mheck Exception on Page Size Changes | MCEPSC, No eXcuses, iTLB Multihit
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[CVE-2020-0543](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-0543) | Special Register Buffer Data Sampling | SRBDS
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[CVE-2021-26341](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-26341) | Straight-line Speculation | SLS
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Supported operating systems:
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- Linux (all versions, flavors and distros)
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@ -178,3 +179,9 @@ docker run --rm --privileged -v /boot:/boot:ro -v /dev/cpu:/dev/cpu:ro -v /lib/m
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- Impact: Kernel
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- Mitigation: microcode update + kernel update helping to protect various CPU internal buffers from unprivileged speculative access to data
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- Performance impact of the mitigation: low
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**CVE-2021-26341** Straight-line Speculation (SLS)
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- Impact: Kernel
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- Mitigation: kernel update blocking speculation after RET or indirect branch
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- Performance impact of the mitigation: low
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@ -87,7 +87,7 @@ show_usage()
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--batch prometheus produce output for consumption by prometheus-node-exporter
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--variant VARIANT specify which variant you'd like to check, by default all variants are checked
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VARIANT can be one of 1, 2, 3, 3a, 4, l1tf, msbds, mfbds, mlpds, mdsum, taa, mcepsc, srbds
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VARIANT can be one of 1, 2, 3, 3a, 4, l1tf, msbds, mfbds, mlpds, mdsum, taa, mcepsc, srbds, sls
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can be specified multiple times (e.g. --variant 2 --variant 3)
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--cve [cve1,cve2,...] specify which CVE you'd like to check, by default all supported CVEs are checked
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--hw-only only check for CPU information, don't check for any variant
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@ -170,7 +170,7 @@ global_critical=0
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global_unknown=0
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nrpe_vuln=''
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supported_cve_list='CVE-2017-5753 CVE-2017-5715 CVE-2017-5754 CVE-2018-3640 CVE-2018-3639 CVE-2018-3615 CVE-2018-3620 CVE-2018-3646 CVE-2018-12126 CVE-2018-12130 CVE-2018-12127 CVE-2019-11091 CVE-2019-11135 CVE-2018-12207 CVE-2020-0543'
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supported_cve_list='CVE-2017-5753 CVE-2017-5715 CVE-2017-5754 CVE-2018-3640 CVE-2018-3639 CVE-2018-3615 CVE-2018-3620 CVE-2018-3646 CVE-2018-12126 CVE-2018-12130 CVE-2018-12127 CVE-2019-11091 CVE-2019-11135 CVE-2018-12207 CVE-2020-0543 CVE-2021-26341'
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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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@ -295,6 +295,7 @@ cve2name()
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CVE-2019-11135) echo "ZombieLoad V2, TSX Asynchronous Abort (TAA)";;
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CVE-2018-12207) echo "No eXcuses, iTLB Multihit, machine check exception on page size changes (MCEPSC)";;
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CVE-2020-0543) echo "Special Register Buffer Data Sampling (SRBDS)";;
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CVE-2021-26341) echo "Straight-line speculation (SLS)";;
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*) echo "$0: error: invalid CVE '$1' passed to cve2name()" >&2; exit 255;;
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esac
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}
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@ -319,6 +320,7 @@ _is_cpu_affected_cached()
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CVE-2019-11135) return $variant_taa;;
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CVE-2018-12207) return $variant_itlbmh;;
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CVE-2020-0543) return $variant_srbds;;
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CVE-2021-26341) return $variant_sls;;
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*) echo "$0: error: invalid variant '$1' passed to is_cpu_affected()" >&2; exit 255;;
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esac
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}
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@ -348,6 +350,7 @@ is_cpu_affected()
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variant_taa=''
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variant_itlbmh=''
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variant_srbds=''
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variant_sls=''
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if is_cpu_mds_free; then
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[ -z "$variant_msbds" ] && variant_msbds=immune
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@ -380,6 +383,7 @@ is_cpu_affected()
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variant_mdsum=immune
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variant_taa=immune
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variant_srbds=immune
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variant_sls=immune
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elif is_intel; then
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# Intel
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# https://github.com/crozone/SpectrePoC/issues/1 ^F E5200 => spectre 2 not affected
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@ -455,6 +459,7 @@ is_cpu_affected()
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_debug "is_cpu_affected: intel family < 6 is immune to l1tf"
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[ -z "$variantl1tf" ] && variantl1tf=immune
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fi
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variant_sls=immune
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elif is_amd || is_hygon; then
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# AMD revised their statement about variant2 => affected
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# https://www.amd.com/en/corporate/speculative-execution
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@ -469,14 +474,17 @@ is_cpu_affected()
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_debug "is_cpu_affected: cpu not affected by speculative store bypass so not vuln to variant4"
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fi
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variantl1tf=immune
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variant_sls=vuln
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elif [ "$cpu_vendor" = CAVIUM ]; then
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variant3=immune
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variant3a=immune
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variantl1tf=immune
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variant_sls=immune
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elif [ "$cpu_vendor" = PHYTIUM ]; then
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variant3=immune
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variant3a=immune
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variantl1tf=immune
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variant_sls=immune
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elif [ "$cpu_vendor" = ARM ]; then
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# ARM
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# reference: https://developer.arm.com/support/security-update
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@ -567,6 +575,7 @@ is_cpu_affected()
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_debug "is_cpu_affected: for cpu$i and so far, we have <$variant1> <$variant2> <$variant3> <$variant3a> <$variant4>"
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done
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variantl1tf=immune
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variant_sls=immune
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fi
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# we handle iTLB Multihit here (not linked to is_specex_free)
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@ -617,6 +626,7 @@ is_cpu_affected()
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[ "$variant_taa" = "immune" ] && variant_taa=1 || variant_taa=0
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[ "$variant_itlbmh" = "immune" ] && variant_itlbmh=1 || variant_itlbmh=0
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[ "$variant_srbds" = "immune" ] && variant_srbds=1 || variant_srbds=0
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[ "$variant_sls" = "immune" ] && variant_sls=1 || variant_sls=0
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variantl1tf_sgx="$variantl1tf"
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# even if we are affected to L1TF, if there's no SGX, we're not affected to the original foreshadow
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[ "$cpuid_sgx" = 0 ] && variantl1tf_sgx=1
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@ -1148,6 +1158,7 @@ while [ -n "${1:-}" ]; do
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taa) opt_cve_list="$opt_cve_list CVE-2019-11135"; opt_cve_all=0;;
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mcepsc) opt_cve_list="$opt_cve_list CVE-2018-12207"; opt_cve_all=0;;
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srbds) opt_cve_list="$opt_cve_list CVE-2020-0543"; opt_cve_all=0;;
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sls) opt_cve_list="$opt_cve_list CVE-2021-26341"; opt_cve_all=0;;
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*)
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echo "$0: error: invalid parameter '$2' for --variant, expected either 1, 2, 3, 3a, 4, l1tf, msbds, mfbds, mlpds, mdsum, taa, mcepsc or srbds" >&2;
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exit 255
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@ -1240,6 +1251,7 @@ pvulnstatus()
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CVE-2019-11135) aka="TAA";;
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CVE-2018-12207) aka="ITLBMH";;
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CVE-2020-0543) aka="SRBDS";;
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CVE-2021-26341) aka="SLS";;
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*) echo "$0: error: invalid CVE '$1' passed to pvulnstatus()" >&2; exit 255;;
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esac
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@ -5751,6 +5763,65 @@ check_CVE_2020_0543_bsd()
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fi
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}
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#######################
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# SLS SECTION
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check_CVE_2021_26341()
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{
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cve='CVE-2021-26341'
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_info "\033[1;34m$cve aka '$(cve2name "$cve")'\033[0m"
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if [ "$os" = Linux ]; then
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check_CVE_2021_26341_linux
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elif echo "$os" | grep -q BSD; then
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check_CVE_CVE-2021-26341_bsd
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else
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_warn "Unsupported OS ($os)"
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fi
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}
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check_CVE_2021_26341_linux()
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{
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status=UNK
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sls_kernel_mitigation=''
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msg=''
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_info_nol "* Mitigated according to the /sys interface: "
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pstatus blue "N/A"
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if [ "$opt_sysfs_only" = 1 ]; then
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msg="/sys vulnerability interface use forced, but SLS mitigation is not reported"
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elif [ -r "$opt_config" ]; then
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sls_kernel_mitigation=$(grep -w 'CONFIG_SLS=y' "$opt_config")
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_info_nol "* Kernel is compiled with SLS mitigation option: "
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if [ -n "$sls_kernel_mitigation" ]; then
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_debug "sls_mitigation: found '$sls_kernel_mitigation' in $opt_config"
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pstatus green "YES"
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status=OK
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msg="Kernel is compiled to mitigate the vulnerability"
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else
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pstatus yellow "NO"
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status=VULN
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msg="Kernel is not compiled to mitigate the vulnerability"
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fi
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else
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msg="(Unable to determine if kernel is compiled to mitigate the vunerability)"
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fi
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if ! is_cpu_affected "$cve"; then
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pvulnstatus $cve OK "your CPU vendor reported your CPU model as not affected"
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else
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pvulnstatus "$cve" $status "$msg"
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fi
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}
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check_CVE_2021_26341_bsd()
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{
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if ! is_cpu_affected "$cve"; then
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# override status & msg in case CPU is not vulnerable after all
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pvulnstatus "$cve" OK "your CPU vendor reported your CPU model as not affected"
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else
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pvulnstatus "$cve" UNK "your CPU is affected, but mitigation detection has not yet been implemented for BSD in this script"
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fi
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}
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#######################
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# END OF VULNS SECTIONS
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