lib: test_kasan: add some testcases

Add some out of bounds testcases to test_kasan module.
Signed-off-by: NWang Long <long.wanglong@huawei.com>
Acked-by: NAndrey Ryabinin <aryabinin@virtuozzo.com>
Cc: Vladimir Murzin <vladimir.murzin@arm.com>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

lib/test_kasan.c

@@ -138,6 +138,71 @@ static noinline void __init kmalloc_oob_16(void)
 	kfree(ptr2);
 }
 
+static noinline void __init kmalloc_oob_memset_2(void)
+{
+	char *ptr;
+	size_t size = 8;
+
+	pr_info("out-of-bounds in memset2\n");
+	ptr = kmalloc(size, GFP_KERNEL);
+	if (!ptr) {
+		pr_err("Allocation failed\n");
+		return;
+	}
+
+	memset(ptr+7, 0, 2);
+	kfree(ptr);
+}
+
+static noinline void __init kmalloc_oob_memset_4(void)
+{
+	char *ptr;
+	size_t size = 8;
+
+	pr_info("out-of-bounds in memset4\n");
+	ptr = kmalloc(size, GFP_KERNEL);
+	if (!ptr) {
+		pr_err("Allocation failed\n");
+		return;
+	}
+
+	memset(ptr+5, 0, 4);
+	kfree(ptr);
+}
+
+
+static noinline void __init kmalloc_oob_memset_8(void)
+{
+	char *ptr;
+	size_t size = 8;
+
+	pr_info("out-of-bounds in memset8\n");
+	ptr = kmalloc(size, GFP_KERNEL);
+	if (!ptr) {
+		pr_err("Allocation failed\n");
+		return;
+	}
+
+	memset(ptr+1, 0, 8);
+	kfree(ptr);
+}
+
+static noinline void __init kmalloc_oob_memset_16(void)
+{
+	char *ptr;
+	size_t size = 16;
+
+	pr_info("out-of-bounds in memset16\n");
+	ptr = kmalloc(size, GFP_KERNEL);
+	if (!ptr) {
+		pr_err("Allocation failed\n");
+		return;
+	}
+
+	memset(ptr+1, 0, 16);
+	kfree(ptr);
+}
+
 static noinline void __init kmalloc_oob_in_memset(void)
 {
 	char *ptr;
@@ -264,6 +329,10 @@ static int __init kmalloc_tests_init(void)
 	kmalloc_oob_krealloc_less();
 	kmalloc_oob_16();
 	kmalloc_oob_in_memset();
+	kmalloc_oob_memset_2();
+	kmalloc_oob_memset_4();
+	kmalloc_oob_memset_8();
+	kmalloc_oob_memset_16();
 	kmalloc_uaf();
 	kmalloc_uaf_memset();
 	kmalloc_uaf2();