x86/unwind: Detect bad stack return address
authorJosh Poimboeuf <jpoimboe@redhat.com>
Wed, 26 Oct 2016 15:41:51 +0000 (10:41 -0500)
committerIngo Molnar <mingo@kernel.org>
Thu, 27 Oct 2016 06:32:38 +0000 (08:32 +0200)
commitb6959a362177053c1c90db6dc1af25b6bddd8548
tree130057c49063003c48dca7d8697a3726c59d644b
parent0d2b8579add41e08aa1110da864f1071d58e6048
x86/unwind: Detect bad stack return address

If __kernel_text_address() doesn't recognize a return address on the
stack, it probably means that it's some generated code which
__kernel_text_address() doesn't know about yet.

Otherwise there's probably some stack corruption.

Either way, warn about it.

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/2d897898f324e275943b590d160b55e482bba65f.1477496147.git.jpoimboe@redhat.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
arch/x86/kernel/unwind_frame.c