| Oliver Glitta | 1f9f78b | 2021-06-28 19:34:33 -0700 | [diff] [blame] | 1 | // SPDX-License-Identifier: GPL-2.0 |
| 2 | #include <kunit/test.h> |
| 3 | #include <linux/mm.h> |
| 4 | #include <linux/slab.h> |
| 5 | #include <linux/module.h> |
| 6 | #include <linux/kernel.h> |
| 7 | #include "../mm/slab.h" |
| 8 | |
| 9 | static struct kunit_resource resource; |
| 10 | static int slab_errors; |
| 11 | |
| 12 | static void test_clobber_zone(struct kunit *test) |
| 13 | { |
| 14 | struct kmem_cache *s = kmem_cache_create("TestSlub_RZ_alloc", 64, 0, |
| 15 | SLAB_RED_ZONE, NULL); |
| 16 | u8 *p = kmem_cache_alloc(s, GFP_KERNEL); |
| 17 | |
| 18 | kasan_disable_current(); |
| 19 | p[64] = 0x12; |
| 20 | |
| 21 | validate_slab_cache(s); |
| 22 | KUNIT_EXPECT_EQ(test, 2, slab_errors); |
| 23 | |
| 24 | kasan_enable_current(); |
| 25 | kmem_cache_free(s, p); |
| 26 | kmem_cache_destroy(s); |
| 27 | } |
| 28 | |
| 29 | #ifndef CONFIG_KASAN |
| 30 | static void test_next_pointer(struct kunit *test) |
| 31 | { |
| 32 | struct kmem_cache *s = kmem_cache_create("TestSlub_next_ptr_free", 64, 0, |
| 33 | SLAB_POISON, NULL); |
| 34 | u8 *p = kmem_cache_alloc(s, GFP_KERNEL); |
| 35 | unsigned long tmp; |
| 36 | unsigned long *ptr_addr; |
| 37 | |
| 38 | kmem_cache_free(s, p); |
| 39 | |
| 40 | ptr_addr = (unsigned long *)(p + s->offset); |
| 41 | tmp = *ptr_addr; |
| 42 | p[s->offset] = 0x12; |
| 43 | |
| 44 | /* |
| 45 | * Expecting three errors. |
| 46 | * One for the corrupted freechain and the other one for the wrong |
| 47 | * count of objects in use. The third error is fixing broken cache. |
| 48 | */ |
| 49 | validate_slab_cache(s); |
| 50 | KUNIT_EXPECT_EQ(test, 3, slab_errors); |
| 51 | |
| 52 | /* |
| 53 | * Try to repair corrupted freepointer. |
| 54 | * Still expecting two errors. The first for the wrong count |
| 55 | * of objects in use. |
| 56 | * The second error is for fixing broken cache. |
| 57 | */ |
| 58 | *ptr_addr = tmp; |
| 59 | slab_errors = 0; |
| 60 | |
| 61 | validate_slab_cache(s); |
| 62 | KUNIT_EXPECT_EQ(test, 2, slab_errors); |
| 63 | |
| 64 | /* |
| 65 | * Previous validation repaired the count of objects in use. |
| 66 | * Now expecting no error. |
| 67 | */ |
| 68 | slab_errors = 0; |
| 69 | validate_slab_cache(s); |
| 70 | KUNIT_EXPECT_EQ(test, 0, slab_errors); |
| 71 | |
| 72 | kmem_cache_destroy(s); |
| 73 | } |
| 74 | |
| 75 | static void test_first_word(struct kunit *test) |
| 76 | { |
| 77 | struct kmem_cache *s = kmem_cache_create("TestSlub_1th_word_free", 64, 0, |
| 78 | SLAB_POISON, NULL); |
| 79 | u8 *p = kmem_cache_alloc(s, GFP_KERNEL); |
| 80 | |
| 81 | kmem_cache_free(s, p); |
| 82 | *p = 0x78; |
| 83 | |
| 84 | validate_slab_cache(s); |
| 85 | KUNIT_EXPECT_EQ(test, 2, slab_errors); |
| 86 | |
| 87 | kmem_cache_destroy(s); |
| 88 | } |
| 89 | |
| 90 | static void test_clobber_50th_byte(struct kunit *test) |
| 91 | { |
| 92 | struct kmem_cache *s = kmem_cache_create("TestSlub_50th_word_free", 64, 0, |
| 93 | SLAB_POISON, NULL); |
| 94 | u8 *p = kmem_cache_alloc(s, GFP_KERNEL); |
| 95 | |
| 96 | kmem_cache_free(s, p); |
| 97 | p[50] = 0x9a; |
| 98 | |
| 99 | validate_slab_cache(s); |
| 100 | KUNIT_EXPECT_EQ(test, 2, slab_errors); |
| 101 | |
| 102 | kmem_cache_destroy(s); |
| 103 | } |
| 104 | #endif |
| 105 | |
| 106 | static void test_clobber_redzone_free(struct kunit *test) |
| 107 | { |
| 108 | struct kmem_cache *s = kmem_cache_create("TestSlub_RZ_free", 64, 0, |
| 109 | SLAB_RED_ZONE, NULL); |
| 110 | u8 *p = kmem_cache_alloc(s, GFP_KERNEL); |
| 111 | |
| 112 | kasan_disable_current(); |
| 113 | kmem_cache_free(s, p); |
| 114 | p[64] = 0xab; |
| 115 | |
| 116 | validate_slab_cache(s); |
| 117 | KUNIT_EXPECT_EQ(test, 2, slab_errors); |
| 118 | |
| 119 | kasan_enable_current(); |
| 120 | kmem_cache_destroy(s); |
| 121 | } |
| 122 | |
| 123 | static int test_init(struct kunit *test) |
| 124 | { |
| 125 | slab_errors = 0; |
| 126 | |
| 127 | kunit_add_named_resource(test, NULL, NULL, &resource, |
| 128 | "slab_errors", &slab_errors); |
| 129 | return 0; |
| 130 | } |
| 131 | |
| 132 | static struct kunit_case test_cases[] = { |
| 133 | KUNIT_CASE(test_clobber_zone), |
| 134 | |
| 135 | #ifndef CONFIG_KASAN |
| 136 | KUNIT_CASE(test_next_pointer), |
| 137 | KUNIT_CASE(test_first_word), |
| 138 | KUNIT_CASE(test_clobber_50th_byte), |
| 139 | #endif |
| 140 | |
| 141 | KUNIT_CASE(test_clobber_redzone_free), |
| 142 | {} |
| 143 | }; |
| 144 | |
| 145 | static struct kunit_suite test_suite = { |
| 146 | .name = "slub_test", |
| 147 | .init = test_init, |
| 148 | .test_cases = test_cases, |
| 149 | }; |
| 150 | kunit_test_suite(test_suite); |
| 151 | |
| 152 | MODULE_LICENSE("GPL"); |