Patch "x86/retpoline: Add NOENDBR annotation to the SRSO dummy return thunk" has been added to the 6.1-stable tree

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This is a note to let you know that I've just added the patch titled

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

to the 6.1-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     x86-retpoline-add-noendbr-annotation-to-the-srso-dummy-return-thunk.patch
and it can be found in the queue-6.1 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.


>From b377c66ae3509ccea596512d6afb4777711c4870 Mon Sep 17 00:00:00 2001
From: "Borislav Petkov (AMD)" <bp@xxxxxxxxx>
Date: Fri, 5 Apr 2024 16:46:37 +0200
Subject: x86/retpoline: Add NOENDBR annotation to the SRSO dummy return thunk

From: Borislav Petkov (AMD) <bp@xxxxxxxxx>

commit b377c66ae3509ccea596512d6afb4777711c4870 upstream.

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@xxxxxxxxx>
Signed-off-by: Ingo Molnar <mingo@xxxxxxxxxx>
Cc: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Link: https://lore.kernel.org/r/20240405144637.17908-1-bp@xxxxxxxxxx
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
 arch/x86/lib/retpoline.S |    1 +
 1 file changed, 1 insertion(+)

--- a/arch/x86/lib/retpoline.S
+++ b/arch/x86/lib/retpoline.S
@@ -261,6 +261,7 @@ SYM_CODE_START(__x86_return_thunk)
 	UNWIND_HINT_FUNC
 	ANNOTATE_NOENDBR
 	ANNOTATE_UNRET_SAFE
+	ANNOTATE_NOENDBR
 	ret
 	int3
 SYM_CODE_END(__x86_return_thunk)


Patches currently in stable-queue which might be from bp@xxxxxxxxx are

queue-6.1/x86-retpoline-add-noendbr-annotation-to-the-srso-dummy-return-thunk.patch
queue-6.1/x86-bugs-fix-the-srso-mitigation-on-zen3-4.patch
queue-6.1/x86-retpoline-do-the-necessary-fixup-to-the-zen3-4-srso-return-thunk-for-srso.patch




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