[PATCH] kasan: support panic_on_warn

From: Dmitry Vyukov
Date: Fri Oct 14 2016 - 13:11:53 EST

If user sets panic_on_warn, he wants kernel to panic if there is
anything barely wrong with the kernel. KASAN-detected errors
are definitely not less benign than an arbitrary kernel WARNING.

Panic after KASAN errors if panic_on_warn is set.

We use this for continuous fuzzing where we want kernel to stop
and reboot on any error.

Signed-off-by: Dmitry Vyukov <dvyukov@xxxxxxxxxx>
Cc: kasan-dev@xxxxxxxxxxxxxxxx
Cc: Andrey Ryabinin <aryabinin@xxxxxxxxxxxxx>
Cc: Alexander Potapenko <glider@xxxxxxxxxx>
Cc: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Cc: linux-mm@xxxxxxxxx
Cc: linux-kernel@xxxxxxxxxxxxxxx
mm/kasan/report.c | 4 ++++
1 file changed, 4 insertions(+)

diff --git a/mm/kasan/report.c b/mm/kasan/report.c
index 24c1211..ca0bd48 100644
--- a/mm/kasan/report.c
+++ b/mm/kasan/report.c
@@ -133,6 +133,10 @@ static void kasan_end_report(unsigned long *flags)
spin_unlock_irqrestore(&report_lock, *flags);
+ if (panic_on_warn) {
+ panic_on_warn = 0;
+ panic("panic_on_warn set ...\n");
+ }