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");
69 static noinline void __init kmalloc_pagealloc_oob_right(void)
72 size_t size = KMALLOC_MAX_CACHE_SIZE + 10;
74 /* Allocate a chunk that does not fit into a SLUB cache to trigger
75 * the page allocator fallback.
77 pr_info("kmalloc pagealloc allocation: out-of-bounds to right\n");
78 ptr = kmalloc(size, GFP_KERNEL);
80 pr_err("Allocation failed\n");
89 static noinline void __init kmalloc_large_oob_right(void)
92 size_t size = KMALLOC_MAX_CACHE_SIZE - 256;
93 /* Allocate a chunk that is large enough, but still fits into a slab
94 * and does not trigger the page allocator fallback in SLUB.
96 pr_info("kmalloc large allocation: out-of-bounds to right\n");
97 ptr = kmalloc(size, GFP_KERNEL);
99 pr_err("Allocation failed\n");
107 static noinline void __init kmalloc_oob_krealloc_more(void)
113 pr_info("out-of-bounds after krealloc more\n");
114 ptr1 = kmalloc(size1, GFP_KERNEL);
115 ptr2 = krealloc(ptr1, size2, GFP_KERNEL);
116 if (!ptr1 || !ptr2) {
117 pr_err("Allocation failed\n");
126 static noinline void __init kmalloc_oob_krealloc_less(void)
132 pr_info("out-of-bounds after krealloc less\n");
133 ptr1 = kmalloc(size1, GFP_KERNEL);
134 ptr2 = krealloc(ptr1, size2, GFP_KERNEL);
135 if (!ptr1 || !ptr2) {
136 pr_err("Allocation failed\n");
144 static noinline void __init kmalloc_oob_16(void)
150 pr_info("kmalloc out-of-bounds for 16-bytes access\n");
151 ptr1 = kmalloc(sizeof(*ptr1) - 3, GFP_KERNEL);
152 ptr2 = kmalloc(sizeof(*ptr2), GFP_KERNEL);
153 if (!ptr1 || !ptr2) {
154 pr_err("Allocation failed\n");
164 static noinline void __init kmalloc_oob_memset_2(void)
169 pr_info("out-of-bounds in memset2\n");
170 ptr = kmalloc(size, GFP_KERNEL);
172 pr_err("Allocation failed\n");
180 static noinline void __init kmalloc_oob_memset_4(void)
185 pr_info("out-of-bounds in memset4\n");
186 ptr = kmalloc(size, GFP_KERNEL);
188 pr_err("Allocation failed\n");
197 static noinline void __init kmalloc_oob_memset_8(void)
202 pr_info("out-of-bounds in memset8\n");
203 ptr = kmalloc(size, GFP_KERNEL);
205 pr_err("Allocation failed\n");
213 static noinline void __init kmalloc_oob_memset_16(void)
218 pr_info("out-of-bounds in memset16\n");
219 ptr = kmalloc(size, GFP_KERNEL);
221 pr_err("Allocation failed\n");
225 memset(ptr+1, 0, 16);
229 static noinline void __init kmalloc_oob_in_memset(void)
234 pr_info("out-of-bounds in memset\n");
235 ptr = kmalloc(size, GFP_KERNEL);
237 pr_err("Allocation failed\n");
241 memset(ptr, 0, size+5);
245 static noinline void __init kmalloc_uaf(void)
250 pr_info("use-after-free\n");
251 ptr = kmalloc(size, GFP_KERNEL);
253 pr_err("Allocation failed\n");
261 static noinline void __init kmalloc_uaf_memset(void)
266 pr_info("use-after-free in memset\n");
267 ptr = kmalloc(size, GFP_KERNEL);
269 pr_err("Allocation failed\n");
274 memset(ptr, 0, size);
277 static noinline void __init kmalloc_uaf2(void)
282 pr_info("use-after-free after another kmalloc\n");
283 ptr1 = kmalloc(size, GFP_KERNEL);
285 pr_err("Allocation failed\n");
290 ptr2 = kmalloc(size, GFP_KERNEL);
292 pr_err("Allocation failed\n");
298 pr_err("Could not detect use-after-free: ptr1 == ptr2\n");
302 static noinline void __init kmem_cache_oob(void)
306 struct kmem_cache *cache = kmem_cache_create("test_cache",
310 pr_err("Cache allocation failed\n");
313 pr_info("out-of-bounds in kmem_cache_alloc\n");
314 p = kmem_cache_alloc(cache, GFP_KERNEL);
316 pr_err("Allocation failed\n");
317 kmem_cache_destroy(cache);
322 kmem_cache_free(cache, p);
323 kmem_cache_destroy(cache);
326 static char global_array[10];
328 static noinline void __init kasan_global_oob(void)
331 char *p = &global_array[ARRAY_SIZE(global_array) + i];
333 pr_info("out-of-bounds global variable\n");
337 static noinline void __init kasan_stack_oob(void)
339 char stack_array[10];
341 char *p = &stack_array[ARRAY_SIZE(stack_array) + i];
343 pr_info("out-of-bounds on stack\n");
347 static noinline void __init ksize_unpoisons_memory(void)
350 size_t size = 123, real_size = size;
352 pr_info("ksize() unpoisons the whole allocated chunk\n");
353 ptr = kmalloc(size, GFP_KERNEL);
355 pr_err("Allocation failed\n");
358 real_size = ksize(ptr);
359 /* This access doesn't trigger an error. */
362 ptr[real_size] = 'y';
366 static int __init kmalloc_tests_init(void)
370 kmalloc_node_oob_right();
372 kmalloc_pagealloc_oob_right();
374 kmalloc_large_oob_right();
375 kmalloc_oob_krealloc_more();
376 kmalloc_oob_krealloc_less();
378 kmalloc_oob_in_memset();
379 kmalloc_oob_memset_2();
380 kmalloc_oob_memset_4();
381 kmalloc_oob_memset_8();
382 kmalloc_oob_memset_16();
384 kmalloc_uaf_memset();
389 ksize_unpoisons_memory();
393 module_init(kmalloc_tests_init);
394 MODULE_LICENSE("GPL");