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(parent: 43cfbdd) | patch
x86/CPU: Fix FPDSS on Zen1
authorBorislav Petkov (AMD) <bp@alien8.de>
Tue, 7 Apr 2026 09:40:03 +0000 (11:40 +0200)
committerLinus Torvalds <torvalds@linux-foundation.org>
Fri, 17 Apr 2026 13:04:42 +0000 (06:04 -0700)
commite55d98e7756135f32150b9b8f75d580d0d4b2dd3
tree237ff6781f15dcaf2047a7868a2088b29058312atree | snapshot
parent43cfbdda5af60ffc6272a7b8c5c37d1d0a181ca9commit | 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 | blob | blame | history
arch/x86/kernel/cpu/amd.c diff | blob | blame | history
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