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panic: call panic handlers before kmsg_dump

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Since the panic handlers may produce additional information (via printk)
for the kernel log, it should be reported as part of the panic output
saved by kmsg_dump().  Without this re-ordering, nothing that adds
information to a panic will show up in pstore's view when kmsg_dump runs,
and is therefore not visible to crash reporting tools that examine pstore
output.

Signed-off-by: Kees Cook <keescook@chromium.org>
Cc: Anton Vorontsov <anton@enomsg.org>
Cc: Colin Cross <ccross@android.com>
Acked-by: Tony Luck <tony.luck@intel.com>
Cc: Stephen Boyd <sboyd@codeaurora.org>
Cc: Vikram Mulukutla <markivx@codeaurora.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Rusty Russell <rusty@rustcorp.com.au>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Kees Cook 2013-09-11 14:25:49 -07:00 committed by Linus Torvalds
parent 6325932666
commit 6723734cdf
1 changed files with 6 additions and 2 deletions
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8
kernel/panic.c
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@ -123,10 +123,14 @@ void panic(const char *fmt, ...)
*/
smp_send_stop();
kmsg_dump(KMSG_DUMP_PANIC);
/*
* Run any panic handlers, including those that might need to
* add information to the kmsg dump output.
*/
atomic_notifier_call_chain(&panic_notifier_list, 0, buf);
kmsg_dump(KMSG_DUMP_PANIC);
bust_spinlocks(0);
if (!panic_blink)