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git.proxmox.com Git - mirror_ubuntu-hirsute-kernel.git/blob - lib/test_kasan.c
1 // SPDX-License-Identifier: GPL-2.0-only
4 * Copyright (c) 2014 Samsung Electronics Co., Ltd.
5 * Author: Andrey Ryabinin <a.ryabinin@samsung.com>
8 #define pr_fmt(fmt) "kasan test: %s " fmt, __func__
10 #include <linux/bitops.h>
11 #include <linux/delay.h>
12 #include <linux/kasan.h>
13 #include <linux/kernel.h>
15 #include <linux/mman.h>
16 #include <linux/module.h>
17 #include <linux/printk.h>
18 #include <linux/slab.h>
19 #include <linux/string.h>
20 #include <linux/uaccess.h>
26 * Note: test functions are marked noinline so that their names appear in
30 static noinline
void __init
kmalloc_oob_right(void)
35 pr_info("out-of-bounds to right\n");
36 ptr
= kmalloc(size
, GFP_KERNEL
);
38 pr_err("Allocation failed\n");
46 static noinline
void __init
kmalloc_oob_left(void)
51 pr_info("out-of-bounds to left\n");
52 ptr
= kmalloc(size
, GFP_KERNEL
);
54 pr_err("Allocation failed\n");
62 static noinline
void __init
kmalloc_node_oob_right(void)
67 pr_info("kmalloc_node(): out-of-bounds to right\n");
68 ptr
= kmalloc_node(size
, GFP_KERNEL
, 0);
70 pr_err("Allocation failed\n");
79 static noinline
void __init
kmalloc_pagealloc_oob_right(void)
82 size_t size
= KMALLOC_MAX_CACHE_SIZE
+ 10;
84 /* Allocate a chunk that does not fit into a SLUB cache to trigger
85 * the page allocator fallback.
87 pr_info("kmalloc pagealloc allocation: out-of-bounds to right\n");
88 ptr
= kmalloc(size
, GFP_KERNEL
);
90 pr_err("Allocation failed\n");
98 static noinline
void __init
kmalloc_pagealloc_uaf(void)
101 size_t size
= KMALLOC_MAX_CACHE_SIZE
+ 10;
103 pr_info("kmalloc pagealloc allocation: use-after-free\n");
104 ptr
= kmalloc(size
, GFP_KERNEL
);
106 pr_err("Allocation failed\n");
114 static noinline
void __init
kmalloc_pagealloc_invalid_free(void)
117 size_t size
= KMALLOC_MAX_CACHE_SIZE
+ 10;
119 pr_info("kmalloc pagealloc allocation: invalid-free\n");
120 ptr
= kmalloc(size
, GFP_KERNEL
);
122 pr_err("Allocation failed\n");
130 static noinline
void __init
kmalloc_large_oob_right(void)
133 size_t size
= KMALLOC_MAX_CACHE_SIZE
- 256;
134 /* Allocate a chunk that is large enough, but still fits into a slab
135 * and does not trigger the page allocator fallback in SLUB.
137 pr_info("kmalloc large allocation: out-of-bounds to right\n");
138 ptr
= kmalloc(size
, GFP_KERNEL
);
140 pr_err("Allocation failed\n");
148 static noinline
void __init
kmalloc_oob_krealloc_more(void)
154 pr_info("out-of-bounds after krealloc more\n");
155 ptr1
= kmalloc(size1
, GFP_KERNEL
);
156 ptr2
= krealloc(ptr1
, size2
, GFP_KERNEL
);
157 if (!ptr1
|| !ptr2
) {
158 pr_err("Allocation failed\n");
167 static noinline
void __init
kmalloc_oob_krealloc_less(void)
173 pr_info("out-of-bounds after krealloc less\n");
174 ptr1
= kmalloc(size1
, GFP_KERNEL
);
175 ptr2
= krealloc(ptr1
, size2
, GFP_KERNEL
);
176 if (!ptr1
|| !ptr2
) {
177 pr_err("Allocation failed\n");
185 static noinline
void __init
kmalloc_oob_16(void)
191 pr_info("kmalloc out-of-bounds for 16-bytes access\n");
192 ptr1
= kmalloc(sizeof(*ptr1
) - 3, GFP_KERNEL
);
193 ptr2
= kmalloc(sizeof(*ptr2
), GFP_KERNEL
);
194 if (!ptr1
|| !ptr2
) {
195 pr_err("Allocation failed\n");
205 static noinline
void __init
kmalloc_oob_memset_2(void)
210 pr_info("out-of-bounds in memset2\n");
211 ptr
= kmalloc(size
, GFP_KERNEL
);
213 pr_err("Allocation failed\n");
221 static noinline
void __init
kmalloc_oob_memset_4(void)
226 pr_info("out-of-bounds in memset4\n");
227 ptr
= kmalloc(size
, GFP_KERNEL
);
229 pr_err("Allocation failed\n");
238 static noinline
void __init
kmalloc_oob_memset_8(void)
243 pr_info("out-of-bounds in memset8\n");
244 ptr
= kmalloc(size
, GFP_KERNEL
);
246 pr_err("Allocation failed\n");
254 static noinline
void __init
kmalloc_oob_memset_16(void)
259 pr_info("out-of-bounds in memset16\n");
260 ptr
= kmalloc(size
, GFP_KERNEL
);
262 pr_err("Allocation failed\n");
266 memset(ptr
+1, 0, 16);
270 static noinline
void __init
kmalloc_oob_in_memset(void)
275 pr_info("out-of-bounds in memset\n");
276 ptr
= kmalloc(size
, GFP_KERNEL
);
278 pr_err("Allocation failed\n");
282 memset(ptr
, 0, size
+5);
286 static noinline
void __init
kmalloc_uaf(void)
291 pr_info("use-after-free\n");
292 ptr
= kmalloc(size
, GFP_KERNEL
);
294 pr_err("Allocation failed\n");
302 static noinline
void __init
kmalloc_uaf_memset(void)
307 pr_info("use-after-free in memset\n");
308 ptr
= kmalloc(size
, GFP_KERNEL
);
310 pr_err("Allocation failed\n");
315 memset(ptr
, 0, size
);
318 static noinline
void __init
kmalloc_uaf2(void)
323 pr_info("use-after-free after another kmalloc\n");
324 ptr1
= kmalloc(size
, GFP_KERNEL
);
326 pr_err("Allocation failed\n");
331 ptr2
= kmalloc(size
, GFP_KERNEL
);
333 pr_err("Allocation failed\n");
339 pr_err("Could not detect use-after-free: ptr1 == ptr2\n");
343 static noinline
void __init
kfree_via_page(void)
348 unsigned long offset
;
350 pr_info("invalid-free false positive (via page)\n");
351 ptr
= kmalloc(size
, GFP_KERNEL
);
353 pr_err("Allocation failed\n");
357 page
= virt_to_page(ptr
);
358 offset
= offset_in_page(ptr
);
359 kfree(page_address(page
) + offset
);
362 static noinline
void __init
kfree_via_phys(void)
368 pr_info("invalid-free false positive (via phys)\n");
369 ptr
= kmalloc(size
, GFP_KERNEL
);
371 pr_err("Allocation failed\n");
375 phys
= virt_to_phys(ptr
);
376 kfree(phys_to_virt(phys
));
379 static noinline
void __init
kmem_cache_oob(void)
383 struct kmem_cache
*cache
= kmem_cache_create("test_cache",
387 pr_err("Cache allocation failed\n");
390 pr_info("out-of-bounds in kmem_cache_alloc\n");
391 p
= kmem_cache_alloc(cache
, GFP_KERNEL
);
393 pr_err("Allocation failed\n");
394 kmem_cache_destroy(cache
);
399 kmem_cache_free(cache
, p
);
400 kmem_cache_destroy(cache
);
403 static noinline
void __init
memcg_accounted_kmem_cache(void)
408 struct kmem_cache
*cache
;
410 cache
= kmem_cache_create("test_cache", size
, 0, SLAB_ACCOUNT
, NULL
);
412 pr_err("Cache allocation failed\n");
416 pr_info("allocate memcg accounted object\n");
418 * Several allocations with a delay to allow for lazy per memcg kmem
421 for (i
= 0; i
< 5; i
++) {
422 p
= kmem_cache_alloc(cache
, GFP_KERNEL
);
426 kmem_cache_free(cache
, p
);
431 kmem_cache_destroy(cache
);
434 static char global_array
[10];
436 static noinline
void __init
kasan_global_oob(void)
439 char *p
= &global_array
[ARRAY_SIZE(global_array
) + i
];
441 pr_info("out-of-bounds global variable\n");
445 static noinline
void __init
kasan_stack_oob(void)
447 char stack_array
[10];
449 char *p
= &stack_array
[ARRAY_SIZE(stack_array
) + i
];
451 pr_info("out-of-bounds on stack\n");
455 static noinline
void __init
ksize_unpoisons_memory(void)
458 size_t size
= 123, real_size
;
460 pr_info("ksize() unpoisons the whole allocated chunk\n");
461 ptr
= kmalloc(size
, GFP_KERNEL
);
463 pr_err("Allocation failed\n");
466 real_size
= ksize(ptr
);
467 /* This access doesn't trigger an error. */
470 ptr
[real_size
] = 'y';
474 static noinline
void __init
copy_user_test(void)
477 char __user
*usermem
;
481 kmem
= kmalloc(size
, GFP_KERNEL
);
485 usermem
= (char __user
*)vm_mmap(NULL
, 0, PAGE_SIZE
,
486 PROT_READ
| PROT_WRITE
| PROT_EXEC
,
487 MAP_ANONYMOUS
| MAP_PRIVATE
, 0);
488 if (IS_ERR(usermem
)) {
489 pr_err("Failed to allocate user memory\n");
494 pr_info("out-of-bounds in copy_from_user()\n");
495 unused
= copy_from_user(kmem
, usermem
, size
+ 1);
497 pr_info("out-of-bounds in copy_to_user()\n");
498 unused
= copy_to_user(usermem
, kmem
, size
+ 1);
500 pr_info("out-of-bounds in __copy_from_user()\n");
501 unused
= __copy_from_user(kmem
, usermem
, size
+ 1);
503 pr_info("out-of-bounds in __copy_to_user()\n");
504 unused
= __copy_to_user(usermem
, kmem
, size
+ 1);
506 pr_info("out-of-bounds in __copy_from_user_inatomic()\n");
507 unused
= __copy_from_user_inatomic(kmem
, usermem
, size
+ 1);
509 pr_info("out-of-bounds in __copy_to_user_inatomic()\n");
510 unused
= __copy_to_user_inatomic(usermem
, kmem
, size
+ 1);
512 pr_info("out-of-bounds in strncpy_from_user()\n");
513 unused
= strncpy_from_user(kmem
, usermem
, size
+ 1);
515 vm_munmap((unsigned long)usermem
, PAGE_SIZE
);
519 static noinline
void __init
kasan_alloca_oob_left(void)
522 char alloca_array
[i
];
523 char *p
= alloca_array
- 1;
525 pr_info("out-of-bounds to left on alloca\n");
529 static noinline
void __init
kasan_alloca_oob_right(void)
532 char alloca_array
[i
];
533 char *p
= alloca_array
+ i
;
535 pr_info("out-of-bounds to right on alloca\n");
539 static noinline
void __init
kmem_cache_double_free(void)
543 struct kmem_cache
*cache
;
545 cache
= kmem_cache_create("test_cache", size
, 0, 0, NULL
);
547 pr_err("Cache allocation failed\n");
550 pr_info("double-free on heap object\n");
551 p
= kmem_cache_alloc(cache
, GFP_KERNEL
);
553 pr_err("Allocation failed\n");
554 kmem_cache_destroy(cache
);
558 kmem_cache_free(cache
, p
);
559 kmem_cache_free(cache
, p
);
560 kmem_cache_destroy(cache
);
563 static noinline
void __init
kmem_cache_invalid_free(void)
567 struct kmem_cache
*cache
;
569 cache
= kmem_cache_create("test_cache", size
, 0, SLAB_TYPESAFE_BY_RCU
,
572 pr_err("Cache allocation failed\n");
575 pr_info("invalid-free of heap object\n");
576 p
= kmem_cache_alloc(cache
, GFP_KERNEL
);
578 pr_err("Allocation failed\n");
579 kmem_cache_destroy(cache
);
583 /* Trigger invalid free, the object doesn't get freed */
584 kmem_cache_free(cache
, p
+ 1);
587 * Properly free the object to prevent the "Objects remaining in
588 * test_cache on __kmem_cache_shutdown" BUG failure.
590 kmem_cache_free(cache
, p
);
592 kmem_cache_destroy(cache
);
595 static noinline
void __init
kasan_memchr(void)
600 pr_info("out-of-bounds in memchr\n");
601 ptr
= kmalloc(size
, GFP_KERNEL
| __GFP_ZERO
);
605 memchr(ptr
, '1', size
+ 1);
609 static noinline
void __init
kasan_memcmp(void)
615 pr_info("out-of-bounds in memcmp\n");
616 ptr
= kmalloc(size
, GFP_KERNEL
| __GFP_ZERO
);
620 memset(arr
, 0, sizeof(arr
));
621 memcmp(ptr
, arr
, size
+1);
625 static noinline
void __init
kasan_strings(void)
630 pr_info("use-after-free in strchr\n");
631 ptr
= kmalloc(size
, GFP_KERNEL
| __GFP_ZERO
);
638 * Try to cause only 1 invalid access (less spam in dmesg).
639 * For that we need ptr to point to zeroed byte.
640 * Skip metadata that could be stored in freed object so ptr
641 * will likely point to zeroed byte.
646 pr_info("use-after-free in strrchr\n");
649 pr_info("use-after-free in strcmp\n");
652 pr_info("use-after-free in strncmp\n");
653 strncmp(ptr
, "2", 1);
655 pr_info("use-after-free in strlen\n");
658 pr_info("use-after-free in strnlen\n");
662 static noinline
void __init
kasan_bitops(void)
665 * Allocate 1 more byte, which causes kzalloc to round up to 16-bytes;
666 * this way we do not actually corrupt other memory.
668 long *bits
= kzalloc(sizeof(*bits
) + 1, GFP_KERNEL
);
673 * Below calls try to access bit within allocated memory; however, the
674 * below accesses are still out-of-bounds, since bitops are defined to
675 * operate on the whole long the bit is in.
677 pr_info("out-of-bounds in set_bit\n");
678 set_bit(BITS_PER_LONG
, bits
);
680 pr_info("out-of-bounds in __set_bit\n");
681 __set_bit(BITS_PER_LONG
, bits
);
683 pr_info("out-of-bounds in clear_bit\n");
684 clear_bit(BITS_PER_LONG
, bits
);
686 pr_info("out-of-bounds in __clear_bit\n");
687 __clear_bit(BITS_PER_LONG
, bits
);
689 pr_info("out-of-bounds in clear_bit_unlock\n");
690 clear_bit_unlock(BITS_PER_LONG
, bits
);
692 pr_info("out-of-bounds in __clear_bit_unlock\n");
693 __clear_bit_unlock(BITS_PER_LONG
, bits
);
695 pr_info("out-of-bounds in change_bit\n");
696 change_bit(BITS_PER_LONG
, bits
);
698 pr_info("out-of-bounds in __change_bit\n");
699 __change_bit(BITS_PER_LONG
, bits
);
702 * Below calls try to access bit beyond allocated memory.
704 pr_info("out-of-bounds in test_and_set_bit\n");
705 test_and_set_bit(BITS_PER_LONG
+ BITS_PER_BYTE
, bits
);
707 pr_info("out-of-bounds in __test_and_set_bit\n");
708 __test_and_set_bit(BITS_PER_LONG
+ BITS_PER_BYTE
, bits
);
710 pr_info("out-of-bounds in test_and_set_bit_lock\n");
711 test_and_set_bit_lock(BITS_PER_LONG
+ BITS_PER_BYTE
, bits
);
713 pr_info("out-of-bounds in test_and_clear_bit\n");
714 test_and_clear_bit(BITS_PER_LONG
+ BITS_PER_BYTE
, bits
);
716 pr_info("out-of-bounds in __test_and_clear_bit\n");
717 __test_and_clear_bit(BITS_PER_LONG
+ BITS_PER_BYTE
, bits
);
719 pr_info("out-of-bounds in test_and_change_bit\n");
720 test_and_change_bit(BITS_PER_LONG
+ BITS_PER_BYTE
, bits
);
722 pr_info("out-of-bounds in __test_and_change_bit\n");
723 __test_and_change_bit(BITS_PER_LONG
+ BITS_PER_BYTE
, bits
);
725 pr_info("out-of-bounds in test_bit\n");
726 (void)test_bit(BITS_PER_LONG
+ BITS_PER_BYTE
, bits
);
728 #if defined(clear_bit_unlock_is_negative_byte)
729 pr_info("out-of-bounds in clear_bit_unlock_is_negative_byte\n");
730 clear_bit_unlock_is_negative_byte(BITS_PER_LONG
+ BITS_PER_BYTE
, bits
);
735 static noinline
void __init
kmalloc_double_kzfree(void)
740 pr_info("double-free (kzfree)\n");
741 ptr
= kmalloc(size
, GFP_KERNEL
);
743 pr_err("Allocation failed\n");
751 static int __init
kmalloc_tests_init(void)
754 * Temporarily enable multi-shot mode. Otherwise, we'd only get a
755 * report for the first case.
757 bool multishot
= kasan_save_enable_multi_shot();
761 kmalloc_node_oob_right();
763 kmalloc_pagealloc_oob_right();
764 kmalloc_pagealloc_uaf();
765 kmalloc_pagealloc_invalid_free();
767 kmalloc_large_oob_right();
768 kmalloc_oob_krealloc_more();
769 kmalloc_oob_krealloc_less();
771 kmalloc_oob_in_memset();
772 kmalloc_oob_memset_2();
773 kmalloc_oob_memset_4();
774 kmalloc_oob_memset_8();
775 kmalloc_oob_memset_16();
777 kmalloc_uaf_memset();
782 memcg_accounted_kmem_cache();
785 kasan_alloca_oob_left();
786 kasan_alloca_oob_right();
787 ksize_unpoisons_memory();
789 kmem_cache_double_free();
790 kmem_cache_invalid_free();
795 kmalloc_double_kzfree();
797 kasan_restore_multi_shot(multishot
);
802 module_init(kmalloc_tests_init
);
803 MODULE_LICENSE("GPL");