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authorAndy Lutomirski <luto@kernel.org>2016-07-05 00:31:25 +0200
committerIngo Molnar <mingo@kernel.org>2016-07-08 11:33:18 +0200
commitef16dd0c2a523d2e3975bb1bea9f5727e3e7146f (patch)
tree5bbd6f5cec97d5f2ac862e4cc2652f31a5bce593 /arch/x86/kernel/dumpstack_64.c
parenta99cde438de0c4c0cecc1d1af1a55a75b10bfdef (diff)
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@kernel.org> Signed-off-by: Borislav Petkov <bp@suse.de> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Andy Lutomirski <luto@amacapital.net> Cc: Borislav Petkov <bp@alien8.de> Cc: Brian Gerst <brgerst@gmail.com> Cc: Denys Vlasenko <dvlasenk@redhat.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: H. Peter Anvin <hpa@zytor.com> Cc: Josh Poimboeuf <jpoimboe@redhat.com> Cc: Kees Cook <keescook@chromium.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.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@kernel.org>
Diffstat (limited to 'arch/x86/kernel/dumpstack_64.c')
-rw-r--r--arch/x86/kernel/dumpstack_64.c4
1 files changed, 3 insertions, 1 deletions
diff --git a/arch/x86/kernel/dumpstack_64.c b/arch/x86/kernel/dumpstack_64.c
index d558a8a49016..a81e1ef73bf2 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;