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/mman.h>
17 #include <linux/printk.h>
18 #include <linux/slab.h>
19 #include <linux/string.h>
20 #include <linux/uaccess.h>
21 #include <linux/module.h>
24 * Note: test functions are marked noinline so that their names appear in
28 static noinline void __init kmalloc_oob_right(void)
33 pr_info("out-of-bounds to right\n");
34 ptr = kmalloc(size, GFP_KERNEL);
36 pr_err("Allocation failed\n");
44 static noinline void __init kmalloc_oob_left(void)
49 pr_info("out-of-bounds to left\n");
50 ptr = kmalloc(size, GFP_KERNEL);
52 pr_err("Allocation failed\n");
60 static noinline void __init kmalloc_node_oob_right(void)
65 pr_info("kmalloc_node(): out-of-bounds to right\n");
66 ptr = kmalloc_node(size, GFP_KERNEL, 0);
68 pr_err("Allocation failed\n");
77 static noinline void __init kmalloc_pagealloc_oob_right(void)
80 size_t size = KMALLOC_MAX_CACHE_SIZE + 10;
82 /* Allocate a chunk that does not fit into a SLUB cache to trigger
83 * the page allocator fallback.
85 pr_info("kmalloc pagealloc allocation: out-of-bounds to right\n");
86 ptr = kmalloc(size, GFP_KERNEL);
88 pr_err("Allocation failed\n");
97 static noinline void __init kmalloc_large_oob_right(void)
100 size_t size = KMALLOC_MAX_CACHE_SIZE - 256;
101 /* Allocate a chunk that is large enough, but still fits into a slab
102 * and does not trigger the page allocator fallback in SLUB.
104 pr_info("kmalloc large allocation: out-of-bounds to right\n");
105 ptr = kmalloc(size, GFP_KERNEL);
107 pr_err("Allocation failed\n");
115 static noinline void __init kmalloc_oob_krealloc_more(void)
121 pr_info("out-of-bounds after krealloc more\n");
122 ptr1 = kmalloc(size1, GFP_KERNEL);
123 ptr2 = krealloc(ptr1, size2, GFP_KERNEL);
124 if (!ptr1 || !ptr2) {
125 pr_err("Allocation failed\n");
135 static noinline void __init kmalloc_oob_krealloc_less(void)
141 pr_info("out-of-bounds after krealloc less\n");
142 ptr1 = kmalloc(size1, GFP_KERNEL);
143 ptr2 = krealloc(ptr1, size2, GFP_KERNEL);
144 if (!ptr1 || !ptr2) {
145 pr_err("Allocation failed\n");
153 static noinline void __init kmalloc_oob_16(void)
159 pr_info("kmalloc out-of-bounds for 16-bytes access\n");
160 ptr1 = kmalloc(sizeof(*ptr1) - 3, GFP_KERNEL);
161 ptr2 = kmalloc(sizeof(*ptr2), GFP_KERNEL);
162 if (!ptr1 || !ptr2) {
163 pr_err("Allocation failed\n");
173 static noinline void __init kmalloc_oob_memset_2(void)
178 pr_info("out-of-bounds in memset2\n");
179 ptr = kmalloc(size, GFP_KERNEL);
181 pr_err("Allocation failed\n");
189 static noinline void __init kmalloc_oob_memset_4(void)
194 pr_info("out-of-bounds in memset4\n");
195 ptr = kmalloc(size, GFP_KERNEL);
197 pr_err("Allocation failed\n");
206 static noinline void __init kmalloc_oob_memset_8(void)
211 pr_info("out-of-bounds in memset8\n");
212 ptr = kmalloc(size, GFP_KERNEL);
214 pr_err("Allocation failed\n");
222 static noinline void __init kmalloc_oob_memset_16(void)
227 pr_info("out-of-bounds in memset16\n");
228 ptr = kmalloc(size, GFP_KERNEL);
230 pr_err("Allocation failed\n");
234 memset(ptr+1, 0, 16);
238 static noinline void __init kmalloc_oob_in_memset(void)
243 pr_info("out-of-bounds in memset\n");
244 ptr = kmalloc(size, GFP_KERNEL);
246 pr_err("Allocation failed\n");
250 memset(ptr, 0, size+5);
254 static noinline void __init kmalloc_uaf(void)
259 pr_info("use-after-free\n");
260 ptr = kmalloc(size, GFP_KERNEL);
262 pr_err("Allocation failed\n");
270 static noinline void __init kmalloc_uaf_memset(void)
275 pr_info("use-after-free in memset\n");
276 ptr = kmalloc(size, GFP_KERNEL);
278 pr_err("Allocation failed\n");
283 memset(ptr, 0, size);
286 static noinline void __init kmalloc_uaf2(void)
291 pr_info("use-after-free after another kmalloc\n");
292 ptr1 = kmalloc(size, GFP_KERNEL);
294 pr_err("Allocation failed\n");
299 ptr2 = kmalloc(size, GFP_KERNEL);
301 pr_err("Allocation failed\n");
307 pr_err("Could not detect use-after-free: ptr1 == ptr2\n");
311 static noinline void __init kmem_cache_oob(void)
315 struct kmem_cache *cache = kmem_cache_create("test_cache",
319 pr_err("Cache allocation failed\n");
322 pr_info("out-of-bounds in kmem_cache_alloc\n");
323 p = kmem_cache_alloc(cache, GFP_KERNEL);
325 pr_err("Allocation failed\n");
326 kmem_cache_destroy(cache);
331 kmem_cache_free(cache, p);
332 kmem_cache_destroy(cache);
335 static char global_array[10];
337 static noinline void __init kasan_global_oob(void)
340 char *p = &global_array[ARRAY_SIZE(global_array) + i];
342 pr_info("out-of-bounds global variable\n");
346 static noinline void __init kasan_stack_oob(void)
348 char stack_array[10];
350 char *p = &stack_array[ARRAY_SIZE(stack_array) + i];
352 pr_info("out-of-bounds on stack\n");
356 static noinline void __init ksize_unpoisons_memory(void)
359 size_t size = 123, real_size;
361 pr_info("ksize() unpoisons the whole allocated chunk\n");
362 ptr = kmalloc(size, GFP_KERNEL);
364 pr_err("Allocation failed\n");
367 real_size = ksize(ptr);
368 /* This access doesn't trigger an error. */
371 ptr[real_size] = 'y';
375 static noinline void __init copy_user_test(void)
378 char __user *usermem;
382 kmem = kmalloc(size, GFP_KERNEL);
386 usermem = (char __user *)vm_mmap(NULL, 0, PAGE_SIZE,
387 PROT_READ | PROT_WRITE | PROT_EXEC,
388 MAP_ANONYMOUS | MAP_PRIVATE, 0);
389 if (IS_ERR(usermem)) {
390 pr_err("Failed to allocate user memory\n");
395 pr_info("out-of-bounds in copy_from_user()\n");
396 unused = copy_from_user(kmem, usermem, size + 1);
398 pr_info("out-of-bounds in copy_to_user()\n");
399 unused = copy_to_user(usermem, kmem, size + 1);
401 pr_info("out-of-bounds in __copy_from_user()\n");
402 unused = __copy_from_user(kmem, usermem, size + 1);
404 pr_info("out-of-bounds in __copy_to_user()\n");
405 unused = __copy_to_user(usermem, kmem, size + 1);
407 pr_info("out-of-bounds in __copy_from_user_inatomic()\n");
408 unused = __copy_from_user_inatomic(kmem, usermem, size + 1);
410 pr_info("out-of-bounds in __copy_to_user_inatomic()\n");
411 unused = __copy_to_user_inatomic(usermem, kmem, size + 1);
413 pr_info("out-of-bounds in strncpy_from_user()\n");
414 unused = strncpy_from_user(kmem, usermem, size + 1);
416 vm_munmap((unsigned long)usermem, PAGE_SIZE);
420 static noinline void __init use_after_scope_test(void)
422 volatile char *volatile p;
424 pr_info("use-after-scope on int\n");
433 pr_info("use-after-scope on array\n");
435 char local[1024] = {0};
443 static int __init kmalloc_tests_init(void)
447 kmalloc_node_oob_right();
449 kmalloc_pagealloc_oob_right();
451 kmalloc_large_oob_right();
452 kmalloc_oob_krealloc_more();
453 kmalloc_oob_krealloc_less();
455 kmalloc_oob_in_memset();
456 kmalloc_oob_memset_2();
457 kmalloc_oob_memset_4();
458 kmalloc_oob_memset_8();
459 kmalloc_oob_memset_16();
461 kmalloc_uaf_memset();
466 ksize_unpoisons_memory();
468 use_after_scope_test();
472 module_init(kmalloc_tests_init);
473 MODULE_LICENSE("GPL");