peter/spectre-meltdown-checker
peter/spectre-meltdown-checker
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Stéphane Lesimple 2019-05-14 20:16:01 +02:00
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26
README.md
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@ -10,10 +10,10 @@ A shell script to tell if your system is vulnerable against the several "specula
- CVE-2018-3615 [L1 terminal fault] aka 'Foreshadow (SGX)'
- CVE-2018-3620 [L1 terminal fault] aka 'Foreshadow-NG (OS)'
- CVE-2018-3646 [L1 terminal fault] aka 'Foreshadow-NG (VMM)'
- CVE-2018-12126 [MSBDS] Microarchitectural Store Buffer Data Sampling
- CVE-2018-12130 [MFBDS] Microarchitectural Fill Buffer Data Sampling
- CVE-2018-12127 [MLPDS] Microarchitectural Load Port Data Sampling
- CVE-2019-11091 [MDSUM] Microarchitectural Data Sampling Uncacheable Memory
- CVE-2018-12126 [microarchitectural store buffer data sampling (MSBDS)] aka 'Fallout'
- CVE-2018-12130 [microarchitectural fill buffer data sampling (MFBDS)] aka 'RIDL'
- CVE-2018-12127 [microarchitectural load port data sampling (MLPDS)] aka 'RIDL'
- CVE-2019-11091 [microarchitectural data sampling uncacheable memory (MDSUM)] aka 'RIDL'
Supported operating systems:
- Linux (all versions, flavors and distros)
@ -125,21 +125,25 @@ docker run --rm --privileged -v /boot:/boot:ro -v /dev/cpu:/dev/cpu:ro -v /lib/m
- Impact: Kernel & System management mode
- Mitigation: updated kernel (with PTE inversion)
- Performance impact of the mitigation: negligible
**CVE-2018-3646** l1 terminal fault (Foreshadow-NG VMM)
- Impact: Virtualization software and Virtual Machine Monitors
- Mitigation: disable ept (extended page tables), disable hyper-threading (SMT), or
updated kernel (with L1d flush)
- Mitigation: disable ept (extended page tables), disable hyper-threading (SMT), or updated kernel (with L1d flush)
- Performance impact of the mitigation: low to significant
**CVE-2018-12126** [MSBDS] Microarchitectural Store Buffer Data Sampling
**CVE-2018-12130** [MFBDS] Microarchitectural Fill Buffer Data Sampling
**CVE-2018-12127** [MLPDS] Microarchitectural Load Port Data Sampling
**CVE-2019-11091** [MDSUM] Microarchitectural Data Sampling Uncacheable Memory
**CVE-2018-12126** [MSBDS] Microarchitectural Store Buffer Data Sampling (Fallout)
**CVE-2018-12130** [MFBDS] Microarchitectural Fill Buffer Data Sampling (RIDL)
**CVE-2018-12127** [MLPDS] Microarchitectural Load Port Data Sampling (RIDL)
**CVE-2019-11091** [MDSUM] Microarchitectural Data Sampling Uncacheable Memory (RIDL)
- Impact: Kernel
- Mitigation: microcode update + kernel update making possible to protect various CPU internal buffers from unprivilaged speculative access to data
- Performance impact of the mitigation: TBC
- Note: These 4 CVEs are similar and collectively named "MDS" vulnerabilities, the mitigation is identical same for all
## Understanding what this script does and doesn't

11
spectre-meltdown-checker.sh
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@ -2354,7 +2354,6 @@ check_cpu()
fi
_info_nol " * ARCH_CAPABILITIES MSR advertises IBRS_ALL capability: "
mds_no=-1
capabilities_mds_no=-1
capabilities_rdcl_no=-1
capabilities_ibrs_all=-1
@ -4269,13 +4268,13 @@ check_mds()
if [ "$opt_live" != 1 ]; then
pstatus blue N/A "not testable in offline mode"
pvulnstatus $cve UNK
pvulnstatus "$cve" UNK
return
fi
if ! is_cpu_vulnerable "$cve" ; then
# override status & msg in case CPU is not vulnerable after all
pvulnstatus $cve OK "your CPU vendor reported your CPU model as not vulnerable"
pvulnstatus "$cve" OK "your CPU vendor reported your CPU model as not vulnerable"
return
fi
@ -4312,11 +4311,11 @@ check_mds()
fi
if [ $mds_mitigated = 0 ];then
pvulnstatus $cve VULN
pvulnstatus "$cve" VULN
elif [ $mds_mitigated = 1 ]; then
pvulnstatus $cve OK
pvulnstatus "$cve" OK
else
pvulnstatus $cve UNK "further action may be needed to mitigate this vulnerability. For more info check Linux kernel Documentation/admin-guide/hw-vuln/mds.rst"
pvulnstatus "$cve" UNK "further action may be needed to mitigate this vulnerability. For more info check Linux kernel Documentation/admin-guide/hw-vuln/mds.rst"
fi
}