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 Forum index » Off-Topic Area » Security
Special Register Buffer Data Sampling
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8Geee


Joined: 12 May 2008
Posts: 2190
Location: N.E. USA

PostPosted: Sat 13 Jun 2020, 12:55    Post subject:  Special Register Buffer Data Sampling
Subject description: Newer Intel MPU/CPU
 

Theres a warning and patches available for the subject SPECTRE/MELTDOWN offense. From the Linux Kernel Org site:
Quote:
SRBDS is an MDS-like speculative side channel that can leak bits from the
random number generator (RNG) across cores and threads. New microcode
serializes the processor access during the execution of RDRAND and
RDSEED. This ensures that the shared buffer is overwritten before it is
released for reuse.

While it is present on all affected CPU models, the microcode mitigation
is not needed on models that enumerate ARCH_CAPABILITIES[MDS_NO] in the
cases where TSX is not supported or has been disabled with TSX_CTRL.

The newest kernel series dated on or after 6/10/2020 have automated the activation of a mitigation. Intel has listed thee affected processor series HERE

In addition to the kernel update for the mitigation, there are several patches for x86 and ext4. All longterm kernels are updated.

Developers please take note.

Regards
8Geee

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