diff options
| author | Wolfram Sang <wsa@kernel.org> | 2020-07-31 15:54:27 +0200 |
|---|---|---|
| committer | Wolfram Sang <wsa@kernel.org> | 2020-07-31 15:54:27 +0200 |
| commit | 073d398dc4841f62488ac6060ffeb9dfce6e0a98 (patch) | |
| tree | 2ae9d508d0cd27f02584b9befb063dda5cb11a0b /arch/x86/kernel/unwind_orc.c | |
| parent | afca861bc6a3141c858d08279eb9afca76584fa6 (diff) | |
| parent | 92ed301919932f777713b9172e525674157e983d (diff) | |
Merge tag 'v5.8-rc7' into i2c/for-5.9
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 7f969b2d240f..ec88bbe08a32 100644 --- a/arch/x86/kernel/unwind_orc.c +++ b/arch/x86/kernel/unwind_orc.c @@ -440,8 +440,11 @@ 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) { @@ -662,6 +665,7 @@ 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, |