linux-kernel - [PATCH] kasan: support panic_on

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Date:   Fri, 14 Oct 2016 19:10:02 +0200
From:   Dmitry Vyukov <dvyukov@...gle.com>
To:     aryabinin@...tuozzo.com, akpm@...ux-foundation.org,
        glider@...gle.com
Cc:     Dmitry Vyukov <dvyukov@...gle.com>, kasan-dev@...glegroups.com,
        linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: [PATCH] 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.

Signed-off-by: Dmitry Vyukov <dvyukov@...gle.com>
Cc: kasan-dev@...glegroups.com
Cc: Andrey Ryabinin <aryabinin@...tuozzo.com>
Cc: Alexander Potapenko <glider@...gle.com>
Cc: Andrew Morton <akpm@...ux-foundation.org>
Cc: linux-mm@...ck.org
Cc: linux-kernel@...r.kernel.org
---
 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)
 	pr_err("==================================================================\n");
 	add_taint(TAINT_BAD_PAGE, LOCKDEP_NOW_UNRELIABLE);
 	spin_unlock_irqrestore(&report_lock, *flags);
+	if (panic_on_warn) {
+		panic_on_warn = 0;
+		panic("panic_on_warn set ...\n");
+	}
 	kasan_enable_current();
 }
 
-- 
2.8.0.rc3.226.g39d4020