e55d98e7756135f32150b9b8f75d580d0d4b2dd3 - linux/kernel/git/tj/cgroup

commit: e55d98e7756135f32150b9b8f75d580d0d4b2dd3
[log]
author: Borislav Petkov (AMD) <bp@alien8.de>
Tue Apr 07 11:40:03 2026 +0200
committer: Linus Torvalds <torvalds@linux-foundation.org>
Fri Apr 17 06:04:42 2026 -0700
tree: 237ff6781f15dcaf2047a7868a2088b29058312a
parent: 43cfbdda5af60ffc6272a7b8c5c37d1d0a181ca9 [diff]

x86/CPU: Fix FPDSS on Zen1

Zen1's hardware divider can leave, under certain circumstances, partial
results from previous operations.  Those results can be leaked by
another, attacker thread.

Fix that with a chicken bit.

Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

arch/x86/include/asm/msr-index.h[diff]
arch/x86/kernel/cpu/amd.c[diff]

2 files changed

tree: 237ff6781f15dcaf2047a7868a2088b29058312a