diff options
| author | Joel Stanley <joel@jms.id.au> | 2020-08-10 07:07:46 +0300 |
|---|---|---|
| committer | Joel Stanley <joel@jms.id.au> | 2020-08-10 07:07:49 +0300 |
| commit | 4789fd48a313d36fe6b8fc1da5e0788f5ea074cb (patch) | |
| tree | 2c8c27b52f0e38abb7416ce81b04c3b85511b694 /arch/x86/kernel/unwind_orc.c | |
| parent | 8a9b346382056b52cd7ff141ae9f15a0fcfeb13d (diff) | |
| parent | d9939285fc818425ae92bd99f8c97b6b9ef3bb88 (diff) | |
| download | linux-4789fd48a313d36fe6b8fc1da5e0788f5ea074cb.tar.xz | |
Merge tag 'v5.4.57' into dev-5.4dev-5.4
This is the 5.4.57 stable release
Signed-off-by: Joel Stanley <joel@jms.id.au>
Diffstat (limited to 'arch/x86/kernel/unwind_orc.c')
| -rw-r--r-- | arch/x86/kernel/unwind_orc.c | 8 |
1 files changed, 6 insertions, 2 deletions
diff --git a/arch/x86/kernel/unwind_orc.c b/arch/x86/kernel/unwind_orc.c index aa0f39dc8129..187a86e0e753 100644 --- a/arch/x86/kernel/unwind_orc.c +++ b/arch/x86/kernel/unwind_orc.c @@ -431,8 +431,11 @@ bool unwind_next_frame(struct unwind_state *state) /* * Find the orc_entry associated with the text address. * - * Decrement call return addresses by one so they work for sibling - * calls and calls to noreturn functions. + * For a call frame (as opposed to a signal frame), state->ip points to + * the instruction after the call. That instruction's stack layout + * could be different from the call instruction's layout, for example + * if the call was to a noreturn function. So get the ORC data for the + * call instruction itself. */ orc = orc_find(state->signal ? state->ip : state->ip - 1); if (!orc) { @@ -653,6 +656,7 @@ void __unwind_start(struct unwind_state *state, struct task_struct *task, state->sp = task->thread.sp; state->bp = READ_ONCE_NOCHECK(frame->bp); state->ip = READ_ONCE_NOCHECK(frame->ret_addr); + state->signal = (void *)state->ip == ret_from_fork; } if (get_stack_info((unsigned long *)state->sp, state->task, |