mirror of
https://github.com/speed47/spectre-meltdown-checker
synced 2024-11-07 06:33:38 +01:00
35 lines
1.5 KiB
Markdown
35 lines
1.5 KiB
Markdown
Spectre & Meltdown Checker
|
|
==========================
|
|
|
|
A simple shell script to tell if your Linux installation is vulnerable against the 3 "speculative execution" CVEs.
|
|
|
|
Without options, it'll inspect you currently running kernel.
|
|
You can also specify a kernel image on the command line, if you'd like to inspect a kernel you're not running.
|
|
|
|
The script will do its best to detect mitigations, including backported non-vanilla patches, regardless of the advertised kernel version number.
|
|
|
|
## Example of script output
|
|
|
|
|
|
|
|
## Quick summary of the 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
|