linux-kernel - [PATCH v1 7/8] kasan: Changed kmalloc_large_oob_right, added kmalloc_pagealloc_oob

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Date:	Wed, 27 Jan 2016 19:25:12 +0100
From:	Alexander Potapenko <glider@...gle.com>
To:	adech.fo@...il.com, cl@...ux.com, dvyukov@...gle.com,
	akpm@...ux-foundation.org, ryabinin.a.a@...il.com,
	rostedt@...dmis.org
Cc:	kasan-dev@...glegroups.com, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org
Subject: [PATCH v1 7/8] kasan: Changed kmalloc_large_oob_right, added kmalloc_pagealloc_oob_right

Signed-off-by: Alexander Potapenko <glider@...gle.com>
---
 lib/test_kasan.c | 18 +++++++++++++++++-
 1 file changed, 17 insertions(+), 1 deletion(-)

diff --git a/lib/test_kasan.c b/lib/test_kasan.c
index 5498a78..822c804 100644
--- a/lib/test_kasan.c
+++ b/lib/test_kasan.c
@@ -65,7 +65,8 @@ static noinline void __init kmalloc_node_oob_right(void)
 	kfree(ptr);
 }
 
-static noinline void __init kmalloc_large_oob_right(void)
+#ifdef CONFIG_SLUB
+static noinline void __init kmalloc_pagealloc_oob_right(void)
 {
 	char *ptr;
 	size_t size;
@@ -85,6 +86,18 @@ static noinline void __init kmalloc_large_oob_right(void)
 		size = KMALLOC_MAX_CACHE_SIZE + 10;
 	}
 
+	ptr[size] = 0;
+	kfree(ptr);
+}
+#endif
+
+static noinline void __init kmalloc_large_oob_right(void)
+{
+	char *ptr;
+	size_t size = KMALLOC_MAX_CACHE_SIZE - 256;
+	/* Allocate a chunk that is large enough, but still fits into a slab
+	 * and does not trigger the page allocator fallback in SLUB.
+	 */
 	pr_info("kmalloc large allocation: out-of-bounds to right\n");
 	ptr = kmalloc(size, GFP_KERNEL);
 	if (!ptr) {
@@ -341,6 +354,9 @@ static int __init kmalloc_tests_init(void)
 	kmalloc_oob_right();
 	kmalloc_oob_left();
 	kmalloc_node_oob_right();
+#ifdef CONFIG_SLUB
+	kmalloc_pagealloc_oob_right();
+#endif
 	kmalloc_large_oob_right();
 	kmalloc_oob_krealloc_more();
 	kmalloc_oob_krealloc_less();
-- 
2.7.0.rc3.207.g0ac5344