linux-kernel - [PATCH v2 1/2] mm, kasan: don't call kasan

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Message-Id: <2126fe9ca8c3a4698c0ad7aae652dce28e261182.1460545373.git.glider@google.com>
Date:	Wed, 13 Apr 2016 13:20:09 +0200
From:	Alexander Potapenko <glider@...gle.com>
To:	adech.fo@...il.com, dvyukov@...gle.com, cl@...ux.com,
	akpm@...ux-foundation.org, ryabinin.a.a@...il.com, kcc@...gle.com
Cc:	kasan-dev@...glegroups.com, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org
Subject: [PATCH v2 1/2] mm, kasan: don't call kasan_krealloc() from ksize().

Instead of calling kasan_krealloc(), which replaces the memory allocation
stack ID (if stack depot is used), just unpoison the whole memory chunk.

Signed-off-by: Alexander Potapenko <glider@...gle.com>
---
v2: - splitted v1 into two patches
---
 mm/slab.c | 2 +-
 mm/slub.c | 5 +++--
 2 files changed, 4 insertions(+), 3 deletions(-)

diff --git a/mm/slab.c b/mm/slab.c
index 17e2848..de46319 100644
--- a/mm/slab.c
+++ b/mm/slab.c
@@ -4324,7 +4324,7 @@ size_t ksize(const void *objp)
 	/* We assume that ksize callers could use the whole allocated area,
 	 * so we need to unpoison this area.
 	 */
-	kasan_krealloc(objp, size, GFP_NOWAIT);
+	kasan_unpoison_shadow(objp, size);
 
 	return size;
 }
diff --git a/mm/slub.c b/mm/slub.c
index 4dbb109e..62194e2 100644
--- a/mm/slub.c
+++ b/mm/slub.c
@@ -3635,8 +3635,9 @@ size_t ksize(const void *object)
 {
 	size_t size = __ksize(object);
 	/* We assume that ksize callers could use whole allocated area,
-	   so we need unpoison this area. */
-	kasan_krealloc(object, size, GFP_NOWAIT);
+	 * so we need to unpoison this area.
+	 */
+	kasan_unpoison_shadow(object, size);
 	return size;
 }
 EXPORT_SYMBOL(ksize);
-- 
2.8.0.rc3.226.g39d4020