Merge tag 'v6.2-rockchip-dts32-1' of git://git.kernel.org/pub/scm/linux/kernel/git...
[platform/kernel/linux-starfive.git] / lib / slub_kunit.c
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|SLAB_NO_USER_FLAGS, 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|SLAB_NO_USER_FLAGS, 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|SLAB_NO_USER_FLAGS, 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|SLAB_NO_USER_FLAGS, 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|SLAB_NO_USER_FLAGS, 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");