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Spectre & Meltdown vulnerability/mitigation detection tool for Linux.
07 January, 2018
This post was originally published on this site

Spectre & Meltdown Checker is A simple shell script to tell if your Linux installation is vulnerable against the 3 “speculative execution” CVEs:

CVE-2017-5753 bounds check bypass (Spectre Variant 1)
+ Impact: Kernel & all software
+ Mitigation: recompile software and kernel with a modified compiler that introduces the LFENCE opcode at the proper positions in the resulting code
+ Performance impact of the mitigation: negligible

CVE-2017-5715: branch target injection (Spectre Variant 2)
+ Impact: Kernel
+ Mitigation 1: new opcode via microcode update that should be used by up to date compilers to protect the BTB (by flushing indirect branch predictors)
+ Mitigation 2: introducing “retpoline” into compilers, and recompile software/OS with it
+ Performance impact of the mitigation: high for mitigation 1, medium for mitigation 2, depending on your CPU

CVE-2017-5754: rogue data cache load (Meltdown)
+ Impact: Kernel
+ Mitigation: updated kernel (with PTI/KPTI patches), updating the kernel is enough
+ Performance impact of the mitigation: low to medium

Usage:

git clone https://github.com/speed47/spectre-meltdown-checker && cd spectre-meltdown-checker ./spectre-meltdown-checker.sh (must root user) git clone https://github.com/speed47/spectre-meltdown-checker && cd spectre-meltdown-checker ./spectre-meltdown-checker.sh (must root user)

Source: https://github.com/speed47

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