3 * Copyright (c) 2014 Samsung Electronics Co., Ltd.
4 * Author: Andrey Ryabinin <a.ryabinin@samsung.com>
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
12 #define pr_fmt(fmt) "kasan test: %s " fmt, __func__
14 #include <linux/kernel.h>
15 #include <linux/printk.h>
16 #include <linux/slab.h>
17 #include <linux/string.h>
18 #include <linux/module.h>
20 static noinline
void __init
kmalloc_oob_right(void)
25 pr_info("out-of-bounds to right\n");
26 ptr
= kmalloc(size
, GFP_KERNEL
);
28 pr_err("Allocation failed\n");
36 static noinline
void __init
kmalloc_oob_left(void)
41 pr_info("out-of-bounds to left\n");
42 ptr
= kmalloc(size
, GFP_KERNEL
);
44 pr_err("Allocation failed\n");
52 static noinline
void __init
kmalloc_node_oob_right(void)
57 pr_info("kmalloc_node(): out-of-bounds to right\n");
58 ptr
= kmalloc_node(size
, GFP_KERNEL
, 0);
60 pr_err("Allocation failed\n");
68 static noinline
void __init
kmalloc_large_oob_right(void)
71 size_t size
= KMALLOC_MAX_CACHE_SIZE
+ 10;
73 pr_info("kmalloc large allocation: out-of-bounds to right\n");
74 ptr
= kmalloc(size
, GFP_KERNEL
);
76 pr_err("Allocation failed\n");
84 static noinline
void __init
kmalloc_oob_krealloc_more(void)
90 pr_info("out-of-bounds after krealloc more\n");
91 ptr1
= kmalloc(size1
, GFP_KERNEL
);
92 ptr2
= krealloc(ptr1
, size2
, GFP_KERNEL
);
94 pr_err("Allocation failed\n");
103 static noinline
void __init
kmalloc_oob_krealloc_less(void)
109 pr_info("out-of-bounds after krealloc less\n");
110 ptr1
= kmalloc(size1
, GFP_KERNEL
);
111 ptr2
= krealloc(ptr1
, size2
, GFP_KERNEL
);
112 if (!ptr1
|| !ptr2
) {
113 pr_err("Allocation failed\n");
121 static noinline
void __init
kmalloc_oob_16(void)
127 pr_info("kmalloc out-of-bounds for 16-bytes access\n");
128 ptr1
= kmalloc(sizeof(*ptr1
) - 3, GFP_KERNEL
);
129 ptr2
= kmalloc(sizeof(*ptr2
), GFP_KERNEL
);
130 if (!ptr1
|| !ptr2
) {
131 pr_err("Allocation failed\n");
141 static noinline
void __init
kmalloc_oob_memset_2(void)
146 pr_info("out-of-bounds in memset2\n");
147 ptr
= kmalloc(size
, GFP_KERNEL
);
149 pr_err("Allocation failed\n");
157 static noinline
void __init
kmalloc_oob_memset_4(void)
162 pr_info("out-of-bounds in memset4\n");
163 ptr
= kmalloc(size
, GFP_KERNEL
);
165 pr_err("Allocation failed\n");
174 static noinline
void __init
kmalloc_oob_memset_8(void)
179 pr_info("out-of-bounds in memset8\n");
180 ptr
= kmalloc(size
, GFP_KERNEL
);
182 pr_err("Allocation failed\n");
190 static noinline
void __init
kmalloc_oob_memset_16(void)
195 pr_info("out-of-bounds in memset16\n");
196 ptr
= kmalloc(size
, GFP_KERNEL
);
198 pr_err("Allocation failed\n");
202 memset(ptr
+1, 0, 16);
206 static noinline
void __init
kmalloc_oob_in_memset(void)
211 pr_info("out-of-bounds in memset\n");
212 ptr
= kmalloc(size
, GFP_KERNEL
);
214 pr_err("Allocation failed\n");
218 memset(ptr
, 0, size
+5);
222 static noinline
void __init
kmalloc_uaf(void)
227 pr_info("use-after-free\n");
228 ptr
= kmalloc(size
, GFP_KERNEL
);
230 pr_err("Allocation failed\n");
238 static noinline
void __init
kmalloc_uaf_memset(void)
243 pr_info("use-after-free in memset\n");
244 ptr
= kmalloc(size
, GFP_KERNEL
);
246 pr_err("Allocation failed\n");
251 memset(ptr
, 0, size
);
254 static noinline
void __init
kmalloc_uaf2(void)
259 pr_info("use-after-free after another kmalloc\n");
260 ptr1
= kmalloc(size
, GFP_KERNEL
);
262 pr_err("Allocation failed\n");
267 ptr2
= kmalloc(size
, GFP_KERNEL
);
269 pr_err("Allocation failed\n");
277 static noinline
void __init
kmem_cache_oob(void)
281 struct kmem_cache
*cache
= kmem_cache_create("test_cache",
285 pr_err("Cache allocation failed\n");
288 pr_info("out-of-bounds in kmem_cache_alloc\n");
289 p
= kmem_cache_alloc(cache
, GFP_KERNEL
);
291 pr_err("Allocation failed\n");
292 kmem_cache_destroy(cache
);
297 kmem_cache_free(cache
, p
);
298 kmem_cache_destroy(cache
);
301 static char global_array
[10];
303 static noinline
void __init
kasan_global_oob(void)
306 char *p
= &global_array
[ARRAY_SIZE(global_array
) + i
];
308 pr_info("out-of-bounds global variable\n");
312 static noinline
void __init
kasan_stack_oob(void)
314 char stack_array
[10];
316 char *p
= &stack_array
[ARRAY_SIZE(stack_array
) + i
];
318 pr_info("out-of-bounds on stack\n");
322 static int __init
kmalloc_tests_init(void)
326 kmalloc_node_oob_right();
327 kmalloc_large_oob_right();
328 kmalloc_oob_krealloc_more();
329 kmalloc_oob_krealloc_less();
331 kmalloc_oob_in_memset();
332 kmalloc_oob_memset_2();
333 kmalloc_oob_memset_4();
334 kmalloc_oob_memset_8();
335 kmalloc_oob_memset_16();
337 kmalloc_uaf_memset();
345 module_init(kmalloc_tests_init
);
346 MODULE_LICENSE("GPL");
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