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x86/retpoline: Add NOENDBR annotation to the SRSO dummy return thunk

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srso_alias_untrain_ret() is special code, even if it is a dummy
which is called in the !SRSO case, so annotate it like its real
counterpart, to address the following objtool splat:

  vmlinux.o: warning: objtool: .export_symbol+0x2b290: data relocation to !ENDBR: srso_alias_untrain_ret+0x0

Fixes: 4535e1a4174c ("x86/bugs: Fix the SRSO mitigation on Zen3/4")
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Link: https://lore.kernel.org/r/20240405144637.17908-1-bp@kernel.org
This commit is contained in:
Borislav Petkov (AMD) 2024-04-05 16:46:37 +02:00 committed by Ingo Molnar
parent 5f2ca44ed2
commit b377c66ae3
1 changed files with 1 additions and 0 deletions
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arch/x86/lib/retpoline.S
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@ -229,6 +229,7 @@ SYM_CODE_END(srso_return_thunk)
/* Dummy for the alternative in CALL_UNTRAIN_RET. */
SYM_CODE_START(srso_alias_untrain_ret)
ANNOTATE_UNRET_SAFE
ANNOTATE_NOENDBR
ret
int3
SYM_FUNC_END(srso_alias_untrain_ret)