x86/unwind: Warn on bad frame pointer
authorJosh Poimboeuf <jpoimboe@redhat.com>
Wed, 26 Oct 2016 15:41:48 +0000 (10:41 -0500)
committerIngo Molnar <mingo@kernel.org>
Thu, 27 Oct 2016 06:32:37 +0000 (08:32 +0200)
commitc32c47c68a0ae701088c5b2c3798856ed16746ae
treeaa702a4f8e2f511edc3e12262556e6e2388391c1
parentbb12d6740f6de393927362f23f833a79d85df384
x86/unwind: Warn on bad frame pointer

Detect situations in the unwinder where the frame pointer refers to a
bad address, and print an appropriate warning.

Use printk_deferred_once() because the unwinder can be called with the
console lock by lockdep via save_stack_trace().

Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Brian Gerst <brgerst@gmail.com>
Cc: Denys Vlasenko <dvlasenk@redhat.com>
Cc: H. Peter Anvin <hpa@zytor.com>
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/03c888f6f7414d54fa56b393ea25482be6899b5f.1477496147.git.jpoimboe@redhat.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
arch/x86/kernel/unwind_frame.c