linux-kernel - [PATCH v1 1/8] kasan: Change the behavior of kmalloc_large_oob

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Message-Id: <35b553cafcd5b77838aeaf5548b457dfa09e30cf.1453918525.git.glider@google.com>
Date:	Wed, 27 Jan 2016 19:25:06 +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 1/8] kasan: Change the behavior of kmalloc_large_oob_right test

depending on which allocator (SLAB or SLUB) is being used

Signed-off-by: Alexander Potapenko <glider@...gle.com>
---
 lib/test_kasan.c | 17 ++++++++++++++++-
 1 file changed, 16 insertions(+), 1 deletion(-)

diff --git a/lib/test_kasan.c b/lib/test_kasan.c
index c32f3b0..66dd92f 100644
--- a/lib/test_kasan.c
+++ b/lib/test_kasan.c
@@ -68,7 +68,22 @@ static noinline void __init kmalloc_node_oob_right(void)
 static noinline void __init kmalloc_large_oob_right(void)
 {
 	char *ptr;
-	size_t size = KMALLOC_MAX_CACHE_SIZE + 10;
+	size_t size;
+
+	if (KMALLOC_MAX_CACHE_SIZE == KMALLOC_MAX_SIZE) {
+		/*
+		 * We're using the SLAB allocator. Allocate a chunk that fits
+		 * into a slab.
+		 */
+		size = KMALLOC_MAX_CACHE_SIZE - 256;
+	} else {
+		/*
+		 * KMALLOC_MAX_SIZE > KMALLOC_MAX_CACHE_SIZE.
+		 * We're using the SLUB allocator. Allocate a chunk that does
+		 * not fit into a slab to trigger the page allocator.
+		 */
+		size = KMALLOC_MAX_CACHE_SIZE + 10;
+	}
 
 	pr_info("kmalloc large allocation: out-of-bounds to right\n");
 	ptr = kmalloc(size, GFP_KERNEL);
-- 
2.7.0.rc3.207.g0ac5344