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(parent: 7583e8f) | patch
x86/retbleed: Add __x86_return_thunk alignment checks
authorBorislav Petkov (AMD) <bp@alien8.de>
Mon, 15 May 2023 14:07:26 +0000 (16:07 +0200)
committerBorislav Petkov (AMD) <bp@alien8.de>
Wed, 17 May 2023 10:14:21 +0000 (12:14 +0200)
commitf220125b999b2c9694149c6bda2798d8096f47ed
tree7cee09cfdcadf0a27866192d98be136f3a388130tree | snapshot
parent7583e8fbdc49a4dbd916d14863cf1deeddb982f9commit | diff
x86/retbleed: Add __x86_return_thunk alignment checks

Add a linker assertion and compute the 0xcc padding dynamically so that
__x86_return_thunk is always cacheline-aligned. Leave the SYM_START()
macro in as the untraining doesn't need ENDBR annotations anyway.

Suggested-by: Andrew Cooper <andrew.cooper3@citrix.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Reviewed-by: Andrew Cooper <andrew.cooper3@citrix.com>
Link: https://lore.kernel.org/r/20230515140726.28689-1-bp@alien8.de
arch/x86/kernel/vmlinux.lds.S diff | blob | blame | history
arch/x86/lib/retpoline.S diff | blob | blame | history
Linux 6.x block layer and io_uring tree(s)