]>
git.proxmox.com Git - mirror_ubuntu-artful-kernel.git/blob - lib/test_kasan.c
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/delay.h>
15 #include <linux/kernel.h>
16 #include <linux/mman.h>
18 #include <linux/printk.h>
19 #include <linux/slab.h>
20 #include <linux/string.h>
21 #include <linux/uaccess.h>
22 #include <linux/module.h>
25 * Note: test functions are marked noinline so that their names appear in
29 static noinline
void __init
kmalloc_oob_right(void)
34 pr_info("out-of-bounds to right\n");
35 ptr
= kmalloc(size
, GFP_KERNEL
);
37 pr_err("Allocation failed\n");
45 static noinline
void __init
kmalloc_oob_left(void)
50 pr_info("out-of-bounds to left\n");
51 ptr
= kmalloc(size
, GFP_KERNEL
);
53 pr_err("Allocation failed\n");
61 static noinline
void __init
kmalloc_node_oob_right(void)
66 pr_info("kmalloc_node(): out-of-bounds to right\n");
67 ptr
= kmalloc_node(size
, GFP_KERNEL
, 0);
69 pr_err("Allocation failed\n");
78 static noinline
void __init
kmalloc_pagealloc_oob_right(void)
81 size_t size
= KMALLOC_MAX_CACHE_SIZE
+ 10;
83 /* Allocate a chunk that does not fit into a SLUB cache to trigger
84 * the page allocator fallback.
86 pr_info("kmalloc pagealloc allocation: out-of-bounds to right\n");
87 ptr
= kmalloc(size
, GFP_KERNEL
);
89 pr_err("Allocation failed\n");
98 static noinline
void __init
kmalloc_large_oob_right(void)
101 size_t size
= KMALLOC_MAX_CACHE_SIZE
- 256;
102 /* Allocate a chunk that is large enough, but still fits into a slab
103 * and does not trigger the page allocator fallback in SLUB.
105 pr_info("kmalloc large allocation: out-of-bounds to right\n");
106 ptr
= kmalloc(size
, GFP_KERNEL
);
108 pr_err("Allocation failed\n");
116 static noinline
void __init
kmalloc_oob_krealloc_more(void)
122 pr_info("out-of-bounds after krealloc more\n");
123 ptr1
= kmalloc(size1
, GFP_KERNEL
);
124 ptr2
= krealloc(ptr1
, size2
, GFP_KERNEL
);
125 if (!ptr1
|| !ptr2
) {
126 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 noinline
void __init
memcg_accounted_kmem_cache(void)
340 struct kmem_cache
*cache
;
342 cache
= kmem_cache_create("test_cache", size
, 0, SLAB_ACCOUNT
, NULL
);
344 pr_err("Cache allocation failed\n");
348 pr_info("allocate memcg accounted object\n");
350 * Several allocations with a delay to allow for lazy per memcg kmem
353 for (i
= 0; i
< 5; i
++) {
354 p
= kmem_cache_alloc(cache
, GFP_KERNEL
);
356 pr_err("Allocation failed\n");
359 kmem_cache_free(cache
, p
);
364 kmem_cache_destroy(cache
);
367 static char global_array
[10];
369 static noinline
void __init
kasan_global_oob(void)
372 char *p
= &global_array
[ARRAY_SIZE(global_array
) + i
];
374 pr_info("out-of-bounds global variable\n");
378 static noinline
void __init
kasan_stack_oob(void)
380 char stack_array
[10];
382 char *p
= &stack_array
[ARRAY_SIZE(stack_array
) + i
];
384 pr_info("out-of-bounds on stack\n");
388 static noinline
void __init
ksize_unpoisons_memory(void)
391 size_t size
= 123, real_size
= size
;
393 pr_info("ksize() unpoisons the whole allocated chunk\n");
394 ptr
= kmalloc(size
, GFP_KERNEL
);
396 pr_err("Allocation failed\n");
399 real_size
= ksize(ptr
);
400 /* This access doesn't trigger an error. */
403 ptr
[real_size
] = 'y';
407 static noinline
void __init
copy_user_test(void)
410 char __user
*usermem
;
414 kmem
= kmalloc(size
, GFP_KERNEL
);
418 usermem
= (char __user
*)vm_mmap(NULL
, 0, PAGE_SIZE
,
419 PROT_READ
| PROT_WRITE
| PROT_EXEC
,
420 MAP_ANONYMOUS
| MAP_PRIVATE
, 0);
421 if (IS_ERR(usermem
)) {
422 pr_err("Failed to allocate user memory\n");
427 pr_info("out-of-bounds in copy_from_user()\n");
428 unused
= copy_from_user(kmem
, usermem
, size
+ 1);
430 pr_info("out-of-bounds in copy_to_user()\n");
431 unused
= copy_to_user(usermem
, kmem
, size
+ 1);
433 pr_info("out-of-bounds in __copy_from_user()\n");
434 unused
= __copy_from_user(kmem
, usermem
, size
+ 1);
436 pr_info("out-of-bounds in __copy_to_user()\n");
437 unused
= __copy_to_user(usermem
, kmem
, size
+ 1);
439 pr_info("out-of-bounds in __copy_from_user_inatomic()\n");
440 unused
= __copy_from_user_inatomic(kmem
, usermem
, size
+ 1);
442 pr_info("out-of-bounds in __copy_to_user_inatomic()\n");
443 unused
= __copy_to_user_inatomic(usermem
, kmem
, size
+ 1);
445 pr_info("out-of-bounds in strncpy_from_user()\n");
446 unused
= strncpy_from_user(kmem
, usermem
, size
+ 1);
448 vm_munmap((unsigned long)usermem
, PAGE_SIZE
);
452 static noinline
void __init
use_after_scope_test(void)
454 volatile char *volatile p
;
456 pr_info("use-after-scope on int\n");
465 pr_info("use-after-scope on array\n");
467 char local
[1024] = {0};
475 static int __init
kmalloc_tests_init(void)
479 kmalloc_node_oob_right();
481 kmalloc_pagealloc_oob_right();
483 kmalloc_large_oob_right();
484 kmalloc_oob_krealloc_more();
485 kmalloc_oob_krealloc_less();
487 kmalloc_oob_in_memset();
488 kmalloc_oob_memset_2();
489 kmalloc_oob_memset_4();
490 kmalloc_oob_memset_8();
491 kmalloc_oob_memset_16();
493 kmalloc_uaf_memset();
496 memcg_accounted_kmem_cache();
499 ksize_unpoisons_memory();
501 use_after_scope_test();
505 module_init(kmalloc_tests_init
);
506 MODULE_LICENSE("GPL");