From: Miroslav Benes <mbe...@suse.cz>
commit f1d9a2abff66aa8156fbc1493abed468db63ea48 upstream.
When unwinding an inactive task, the ORC unwinder skips the first frame
by default. If both the 'regs' and 'first_frame' parameters of
unwind_start() are NULL, 'state->sp' and 'first_frame' are later
initialized to the same value for an inactive task. Given there is a
"less than or equal to" comparison used at the end of __unwind_start()
for skipping stack frames, the first frame is skipped.
Drop the equal part of the comparison and make the behavior equivalent
to the frame pointer unwinder.
Fixes: ee9f8fce9964 ("x86/unwind: Add the ORC unwinder")
Reviewed-by: Miroslav Benes <mbe...@suse.cz>
Signed-off-by: Miroslav Benes <mbe...@suse.cz>
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: Jann Horn <ja...@google.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/7f08db872ab59e807016910acdbe82f744de7065.1587808742.git.jpoim...@redhat.com
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>
---
arch/x86/kernel/unwind_orc.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/arch/x86/kernel/unwind_orc.c
+++ b/arch/x86/kernel/unwind_orc.c
@@ -629,7 +629,7 @@ void __unwind_start(struct unwind_state
/* Otherwise, skip ahead to the user-specified starting frame: */
while (!unwind_done(state) &&
(!on_stack(&state->stack_info, first_frame, sizeof(long)) ||
- state->sp <= (unsigned long)first_frame))
+ state->sp < (unsigned long)first_frame))
unwind_next_frame(state);
return;
