From: Jann Horn <ja...@google.com>
commit f977df7b7ca45a4ac4b66d30a8931d0434c394b1 upstream.
The LEAQ instruction in rewind_stack_do_exit() moves the stack pointer
directly below the pt_regs at the top of the task stack before calling
do_exit(). Tell the unwinder to expect pt_regs.
Fixes: 8c1f75587a18 ("x86/entry/64: Add unwind hint annotations")
Reviewed-by: Miroslav Benes <mbe...@suse.cz>
Signed-off-by: Jann Horn <ja...@google.com>
Signed-off-by: Josh Poimboeuf <jpoim...@redhat.com>
Signed-off-by: Ingo Molnar <mi...@kernel.org>
Cc: Andy Lutomirski <l...@kernel.org>
Cc: Dave Jones <d...@fb.com>
Cc: Peter Zijlstra <pet...@infradead.org>
Cc: Thomas Gleixner <t...@linutronix.de>
Cc: Vince Weaver <vincent.wea...@maine.edu>
Link:
https://lore.kernel.org/r/68c33e17ae5963854916a46f522624f8e1d264f2.1587808742.git.jpoim...@redhat.com
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>
---
arch/x86/entry/entry_64.S | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/arch/x86/entry/entry_64.S
+++ b/arch/x86/entry/entry_64.S
@@ -1745,7 +1745,7 @@ ENTRY(rewind_stack_do_exit)
movq PER_CPU_VAR(cpu_current_top_of_stack), %rax
leaq -PTREGS_SIZE(%rax), %rsp
- UNWIND_HINT_FUNC sp_offset=PTREGS_SIZE
+ UNWIND_HINT_REGS
call do_exit
END(rewind_stack_do_exit)
