linux-kernel - [PATCH 6.1] x86/retpoline: Move a NOENDBR annotation to the SRSO dummy return thunk

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Message-ID: <20240709141238.GJZo1FVpZU0jRganFu@fat_crate.local>
Date: Tue, 9 Jul 2024 16:12:38 +0200
From: Borislav Petkov <bp@...en8.de>
To: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc: Jim Mattson <jmattson@...gle.com>, Ingo Molnar <mingo@...nel.org>,
	x86@...nel.org, linux-kernel@...r.kernel.org,
	Greg Thelen <gthelen@...gle.com>, stable@...r.kernel.org
Subject: [PATCH 6.1] x86/retpoline: Move a NOENDBR annotation to the SRSO
 dummy return thunk

From: Jim Mattson <jmattson@...gle.com>
Subject: [PATCH] x86/retpoline: Move a NOENDBR annotation to the SRSO dummy return thunk

The linux-6.1-y backport of commit b377c66ae350 ("x86/retpoline: Add
NOENDBR annotation to the SRSO dummy return thunk") misplaced the new
NOENDBR annotation, repeating the annotation on __x86_return_thunk,
rather than adding the annotation to the !CONFIG_CPU_SRSO version of
srso_alias_untrain_ret, as intended.

Move the annotation to the right place.

Fixes: 0bdc64e9e716 ("x86/retpoline: Add NOENDBR annotation to the SRSO dummy return thunk")
Reported-by: Greg Thelen <gthelen@...gle.com>
Signed-off-by: Jim Mattson <jmattson@...gle.com>
Acked-by: Borislav Petkov (AMD) <bp@...en8.de>
Signed-off-by: Borislav Petkov (AMD) <bp@...en8.de>
Cc: stable@...r.kernel.org
---
 arch/x86/lib/retpoline.S | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/x86/lib/retpoline.S b/arch/x86/lib/retpoline.S
index 055955c9bfcb..7880e2a7ec6a 100644
--- a/arch/x86/lib/retpoline.S
+++ b/arch/x86/lib/retpoline.S
@@ -107,6 +107,7 @@ __EXPORT_THUNK(srso_alias_untrain_ret)
 /* dummy definition for alternatives */
 SYM_START(srso_alias_untrain_ret, SYM_L_GLOBAL, SYM_A_NONE)
 	ANNOTATE_UNRET_SAFE
+	ANNOTATE_NOENDBR
 	ret
 	int3
 SYM_FUNC_END(srso_alias_untrain_ret)
@@ -261,7 +262,6 @@ SYM_CODE_START(__x86_return_thunk)
 	UNWIND_HINT_FUNC
 	ANNOTATE_NOENDBR
 	ANNOTATE_UNRET_SAFE
-	ANNOTATE_NOENDBR
 	ret
 	int3
 SYM_CODE_END(__x86_return_thunk)
-- 
2.43.0

-- 
Regards/Gruss,
    Boris.

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