linux-kernel - [PATCH v2 20/20] x86/power: Support objtool validation in hibernate_asm

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Date:   Thu, 21 Jan 2021 15:29:36 -0600
From:   Josh Poimboeuf <jpoimboe@...hat.com>
To:     x86@...nel.org
Cc:     linux-kernel@...r.kernel.org,
        Peter Zijlstra <peterz@...radead.org>,
        Sami Tolvanen <samitolvanen@...gle.com>,
        Sedat Dilek <sedat.dilek@...il.com>,
        Kees Cook <keescook@...omium.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        clang-built-linux@...glegroups.com,
        Miroslav Benes <mbenes@...e.cz>,
        "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Pavel Machek <pavel@....cz>
Subject: [PATCH v2 20/20] x86/power: Support objtool validation in hibernate_asm_64.S

The OBJECT_FILES_NON_STANDARD annotation is used to tell objtool to
ignore a file.  File-level ignores won't work when validating vmlinux.o.

Instead, convert restore_image() and core_restore_code() to be ELF
functions.  Their code is conventional enough for objtool to be able to
understand them.

Cc: "Rafael J. Wysocki" <rjw@...ysocki.net>
Cc: Pavel Machek <pavel@....cz>
Signed-off-by: Josh Poimboeuf <jpoimboe@...hat.com>
---
 arch/x86/power/Makefile           | 1 -
 arch/x86/power/hibernate_asm_64.S | 8 ++++----
 2 files changed, 4 insertions(+), 5 deletions(-)

diff --git a/arch/x86/power/Makefile b/arch/x86/power/Makefile
index 6907b523e856..3ff80156f21a 100644
--- a/arch/x86/power/Makefile
+++ b/arch/x86/power/Makefile
@@ -1,5 +1,4 @@
 # SPDX-License-Identifier: GPL-2.0
-OBJECT_FILES_NON_STANDARD_hibernate_asm_$(BITS).o := y
 
 # __restore_processor_state() restores %gs after S3 resume and so should not
 # itself be stack-protected
diff --git a/arch/x86/power/hibernate_asm_64.S b/arch/x86/power/hibernate_asm_64.S
index 91c4602d2b5d..d9bed596d849 100644
--- a/arch/x86/power/hibernate_asm_64.S
+++ b/arch/x86/power/hibernate_asm_64.S
@@ -99,7 +99,7 @@ SYM_FUNC_START(swsusp_arch_suspend)
 	ret
 SYM_FUNC_END(swsusp_arch_suspend)
 
-SYM_CODE_START(restore_image)
+SYM_FUNC_START(restore_image)
 	/* prepare to jump to the image kernel */
 	movq	restore_jump_address(%rip), %r8
 	movq	restore_cr3(%rip), %r9
@@ -115,10 +115,10 @@ SYM_CODE_START(restore_image)
 	movq	relocated_restore_code(%rip), %rcx
 	ANNOTATE_RETPOLINE_SAFE
 	jmpq	*%rcx
-SYM_CODE_END(restore_image)
+SYM_FUNC_END(restore_image)
 
 	/* code below has been relocated to a safe page */
-SYM_CODE_START(core_restore_code)
+SYM_FUNC_START(core_restore_code)
 	/* switch to temporary page tables */
 	movq	%rax, %cr3
 	/* flush TLB */
@@ -147,4 +147,4 @@ SYM_CODE_START(core_restore_code)
 	/* jump to the restore_registers address from the image header */
 	ANNOTATE_RETPOLINE_SAFE
 	jmpq	*%r8
-SYM_CODE_END(core_restore_code)
+SYM_FUNC_END(core_restore_code)
-- 
2.29.2