From: Andrey Ryabinin <aryabinin@virtuozzo.com>
Date: Fri, 6 Nov 2015 02:51:26 +0000 (-0800)
Subject: kasan: always taint kernel on report
X-Git-Tag: v4.4-rc1~99^2~5
X-Git-Url: https://asedeno.scripts.mit.edu/gitweb/?a=commitdiff_plain;h=eb06f43f1c94d502b7867b0998e92cdabbc060bc;p=linux.git

kasan: always taint kernel on report

Currently we already taint the kernel in some cases.  E.g.  if we hit some
bug in slub memory we call object_err() which will taint the kernel with
TAINT_BAD_PAGE flag.  But for other kind of bugs kernel left untainted.

Always taint with TAINT_BAD_PAGE if kasan found some bug.  This is useful
for automated testing.

Signed-off-by: Andrey Ryabinin <aryabinin@virtuozzo.com>
Cc: Alexander Potapenko <glider@google.com>
Reviewed-by: Dmitry Vyukov <dvyukov@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 f5e068afb58e..12f222d0224b 100644
--- a/mm/kasan/report.c
+++ b/mm/kasan/report.c
@@ -238,6 +238,7 @@ static void kasan_report_error(struct kasan_access_info *info)
 	}
 	pr_err("================================="
 		"=================================\n");
+	add_taint(TAINT_BAD_PAGE, LOCKDEP_NOW_UNRELIABLE);
 	spin_unlock_irqrestore(&report_lock, flags);
 	kasan_enable_current();
 }