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Message-ID: <tip-779c433b8ea5c9fdfb892265b2ca6213d1f12ff8@git.kernel.org>
Date: Wed, 24 Feb 2016 21:49:52 -0800
From: tip-bot for Josh Poimboeuf <tipbot@...or.com>
To: linux-tip-commits@...r.kernel.org
Cc: acme@...nel.org, torvalds@...ux-foundation.org, brgerst@...il.com,
mingo@...nel.org, palves@...hat.com, matt@...eblueprint.co.uk,
namhyung@...il.com, akpm@...ux-foundation.org, luto@...capital.net,
luto@...nel.org, peterz@...radead.org, chris.j.arges@...onical.com,
mmarek@...e.cz, hpa@...or.com, dvlasenk@...hat.com, bp@...e.de,
bernd@...rovitsch.priv.at, jpoimboe@...hat.com,
linux-kernel@...r.kernel.org, jslaby@...e.cz, tglx@...utronix.de,
bp@...en8.de
Subject: [tip:x86/debug] x86/asm/efi: Create a stack frame in efi_call()
Commit-ID: 779c433b8ea5c9fdfb892265b2ca6213d1f12ff8
Gitweb: http://git.kernel.org/tip/779c433b8ea5c9fdfb892265b2ca6213d1f12ff8
Author: Josh Poimboeuf <jpoimboe@...hat.com>
AuthorDate: Thu, 21 Jan 2016 16:49:23 -0600
Committer: Ingo Molnar <mingo@...nel.org>
CommitDate: Wed, 24 Feb 2016 08:35:43 +0100
x86/asm/efi: Create a stack frame in efi_call()
efi_call() is a callable non-leaf function which doesn't honor
CONFIG_FRAME_POINTER, which can result in bad stack traces.
Create a stack frame for it when CONFIG_FRAME_POINTER is enabled.
Signed-off-by: Josh Poimboeuf <jpoimboe@...hat.com>
Reviewed-by: Matt Fleming <matt@...eblueprint.co.uk>
Reviewed-by: Borislav Petkov <bp@...e.de>
Cc: Andrew Morton <akpm@...ux-foundation.org>
Cc: Andy Lutomirski <luto@...capital.net>
Cc: Andy Lutomirski <luto@...nel.org>
Cc: Arnaldo Carvalho de Melo <acme@...nel.org>
Cc: Bernd Petrovitsch <bernd@...rovitsch.priv.at>
Cc: Borislav Petkov <bp@...en8.de>
Cc: Brian Gerst <brgerst@...il.com>
Cc: Chris J Arges <chris.j.arges@...onical.com>
Cc: Denys Vlasenko <dvlasenk@...hat.com>
Cc: H. Peter Anvin <hpa@...or.com>
Cc: Jiri Slaby <jslaby@...e.cz>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Michal Marek <mmarek@...e.cz>
Cc: Namhyung Kim <namhyung@...il.com>
Cc: Pedro Alves <palves@...hat.com>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: live-patching@...r.kernel.org
Link: http://lkml.kernel.org/r/2294b6fad60eea4cc862eddc8e98a1324e6eeeca.1453405861.git.jpoimboe@redhat.com
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
arch/x86/platform/efi/efi_stub_64.S | 3 +++
1 file changed, 3 insertions(+)
diff --git a/arch/x86/platform/efi/efi_stub_64.S b/arch/x86/platform/efi/efi_stub_64.S
index 86d0f9e..0df2dcc 100644
--- a/arch/x86/platform/efi/efi_stub_64.S
+++ b/arch/x86/platform/efi/efi_stub_64.S
@@ -11,6 +11,7 @@
#include <asm/msr.h>
#include <asm/processor-flags.h>
#include <asm/page_types.h>
+#include <asm/frame.h>
#define SAVE_XMM \
mov %rsp, %rax; \
@@ -74,6 +75,7 @@
.endm
ENTRY(efi_call)
+ FRAME_BEGIN
SAVE_XMM
mov (%rsp), %rax
mov 8(%rax), %rax
@@ -88,6 +90,7 @@ ENTRY(efi_call)
RESTORE_PGT
addq $48, %rsp
RESTORE_XMM
+ FRAME_END
ret
ENDPROC(efi_call)
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