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Diffstat (limited to 'Documentation/kernel-parameters.txt')
| -rw-r--r-- | Documentation/kernel-parameters.txt | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt index da9acfb23383..b19d872feb56 100644 --- a/Documentation/kernel-parameters.txt +++ b/Documentation/kernel-parameters.txt @@ -3787,6 +3787,26 @@ bytes respectively. Such letter suffixes can also be entirely omitted. spia_pedr= spia_peddr= + srbds= [X86,INTEL] + Control the Special Register Buffer Data Sampling + (SRBDS) mitigation. + + Certain CPUs are vulnerable to an MDS-like + exploit which can leak bits from the random + number generator. + + By default, this issue is mitigated by + microcode. However, the microcode fix can cause + the RDRAND and RDSEED instructions to become + much slower. Among other effects, this will + result in reduced throughput from /dev/urandom. + + The microcode mitigation can be disabled with + the following option: + + off: Disable mitigation and remove + performance impact to RDRAND and RDSEED + stack_guard_gap= [MM] override the default stack gap protection. The value is in page units and it defines how many pages prior |