kasan: support panic_on_warn

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.

Link: http://lkml.kernel.org/r/1476694764-31986-1-git-send-email-dvyukov@google.com
Signed-off-by: Dmitry Vyukov <dvyukov@google.com>
Acked-by: Andrey Ryabinin <aryabinin@virtuozzo.com>
Cc: Alexander Potapenko <glider@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/mm/kasan/report.c b/mm/kasan/report.c
index 073325aedc68542a3b05f3859d89a9872aef815f..b82b3e2151574ae1abbb2cd57624114727975410 100644 (file)
--- a/mm/kasan/report.c
+++ b/mm/kasan/report.c
@@ -136,6 +136,8 @@ 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();
 }