linux-kernel - [tip: x86/urgent] x86/retpoline: Add NOENDBR annotation to the SRSO dummy return thunk

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Date: Sat, 06 Apr 2024 11:07:21 -0000
From: "tip-bot2 for Borislav Petkov (AMD)" <tip-bot2@...utronix.de>
To: linux-tip-commits@...r.kernel.org
Cc: "Borislav Petkov (AMD)" <bp@...en8.de>, Ingo Molnar <mingo@...nel.org>,
 Linus Torvalds <torvalds@...ux-foundation.org>, x86@...nel.org,
 linux-kernel@...r.kernel.org
Subject: [tip: x86/urgent] x86/retpoline: Add NOENDBR annotation to the SRSO
 dummy return thunk

The following commit has been merged into the x86/urgent branch of tip:

Commit-ID:     b377c66ae3509ccea596512d6afb4777711c4870
Gitweb:        https://git.kernel.org/tip/b377c66ae3509ccea596512d6afb4777711c4870
Author:        Borislav Petkov (AMD) <bp@...en8.de>
AuthorDate:    Fri, 05 Apr 2024 16:46:37 +02:00
Committer:     Ingo Molnar <mingo@...nel.org>
CommitterDate: Sat, 06 Apr 2024 13:01:50 +02:00

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

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@...en8.de>
Signed-off-by: Ingo Molnar <mingo@...nel.org>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Link: https://lore.kernel.org/r/20240405144637.17908-1-bp@kernel.org
---
 arch/x86/lib/retpoline.S | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/x86/lib/retpoline.S b/arch/x86/lib/retpoline.S
index 0795b34..e674ccf 100644
--- a/arch/x86/lib/retpoline.S
+++ b/arch/x86/lib/retpoline.S
@@ -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)