[PATCH v2] kasan: support panic_on_warn

[Dmitry Vyukov]

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

---

Changes from v1:
 - don't reset panic_on_warn before calling panic()
---
 mm/kasan/report.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/mm/kasan/report.c b/mm/kasan/report.c
index 24c1211..0ee8211 100644
--- a/mm/kasan/report.c
+++ b/mm/kasan/report.c
@@ -133,6 +133,8 @@ static void kasan_end_report(unsigned long *flags)
 	pr_err("==================================================================\n");
 	add_taint(TAINT_BAD_PAGE, LOCKDEP_NOW_UNRELIABLE);
 	spin_unlock_irqrestore(&report_lock, *flags);
+	if (panic_on_warn)
+		panic("panic_on_warn set ...\n");
 	kasan_enable_current();
 }
 
-- 
2.8.0.rc3.226.g39d4020