linux-kernel - [tip:x86/debug] x86/dumpstack: Honor supplied @regs arg

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Message-ID: <tip-ef16dd0c2a523d2e3975bb1bea9f5727e3e7146f@git.kernel.org>
Date:	Fri, 8 Jul 2016 05:07:35 -0700
From:	tip-bot for Andy Lutomirski <tipbot@...or.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	keescook@...omium.org, brgerst@...il.com, tglx@...utronix.de,
	mingo@...nel.org, bp@...en8.de, torvalds@...ux-foundation.org,
	luto@...nel.org, dvlasenk@...hat.com, fweisbec@...il.com,
	hpa@...or.com, bp@...e.de, jpoimboe@...hat.com,
	luto@...capital.net, linux-kernel@...r.kernel.org,
	peterz@...radead.org, akpm@...ux-foundation.org
Subject: [tip:x86/debug] x86/dumpstack: Honor supplied @regs arg

Commit-ID:  ef16dd0c2a523d2e3975bb1bea9f5727e3e7146f
Gitweb:     http://git.kernel.org/tip/ef16dd0c2a523d2e3975bb1bea9f5727e3e7146f
Author:     Andy Lutomirski <luto@...nel.org>
AuthorDate: Tue, 5 Jul 2016 00:31:25 +0200
Committer:  Ingo Molnar <mingo@...nel.org>
CommitDate: Fri, 8 Jul 2016 11:33:18 +0200

x86/dumpstack: Honor supplied @regs arg

The comment suggests that show_stack(NULL, NULL) should backtrace the
current context, but the code doesn't match the comment. If regs are
given, start the "Stack:" hexdump at regs->sp.

Signed-off-by: Andy Lutomirski <luto@...nel.org>
Signed-off-by: Borislav Petkov <bp@...e.de>
Cc: Andrew Morton <akpm@...ux-foundation.org>
Cc: Andy Lutomirski <luto@...capital.net>
Cc: Borislav Petkov <bp@...en8.de>
Cc: Brian Gerst <brgerst@...il.com>
Cc: Denys Vlasenko <dvlasenk@...hat.com>
Cc: Frederic Weisbecker <fweisbec@...il.com>
Cc: H. Peter Anvin <hpa@...or.com>
Cc: Josh Poimboeuf <jpoimboe@...hat.com>
Cc: Kees Cook <keescook@...omium.org>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Thomas Gleixner <tglx@...utronix.de>
Link: http://lkml.kernel.org/r/1467671487-10344-2-git-send-email-bp@alien8.de
Link: http://lkml.kernel.org/r/efcd79bf4106d61f1cd258c2caa87f3a0618eeac.1466036668.git.luto@kernel.org
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 arch/x86/kernel/dumpstack_32.c | 4 +++-
 arch/x86/kernel/dumpstack_64.c | 4 +++-
 2 files changed, 6 insertions(+), 2 deletions(-)

diff --git a/arch/x86/kernel/dumpstack_32.c b/arch/x86/kernel/dumpstack_32.c
index fef917e..948d77d 100644
--- a/arch/x86/kernel/dumpstack_32.c
+++ b/arch/x86/kernel/dumpstack_32.c
@@ -96,7 +96,9 @@ show_stack_log_lvl(struct task_struct *task, struct pt_regs *regs,
 	int i;
 
 	if (sp == NULL) {
-		if (task)
+		if (regs)
+			sp = (unsigned long *)regs->sp;
+		else if (task)
 			sp = (unsigned long *)task->thread.sp;
 		else
 			sp = (unsigned long *)&sp;
diff --git a/arch/x86/kernel/dumpstack_64.c b/arch/x86/kernel/dumpstack_64.c
index d558a8a..a81e1ef 100644
--- a/arch/x86/kernel/dumpstack_64.c
+++ b/arch/x86/kernel/dumpstack_64.c
@@ -264,7 +264,9 @@ show_stack_log_lvl(struct task_struct *task, struct pt_regs *regs,
 	 * back trace for this cpu:
 	 */
 	if (sp == NULL) {
-		if (task)
+		if (regs)
+			sp = (unsigned long *)regs->sp;
+		else if (task)
 			sp = (unsigned long *)task->thread.sp;
 		else
 			sp = (unsigned long *)&sp;