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45051539 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
0822ee4a CM |
2 | /* |
3 | * mm/kmemleak-test.c | |
4 | * | |
5 | * Copyright (C) 2008 ARM Limited | |
6 | * Written by Catalin Marinas <catalin.marinas@arm.com> | |
0822ee4a CM |
7 | */ |
8 | ||
f59428ab FF |
9 | #define pr_fmt(fmt) "kmemleak: " fmt |
10 | ||
0822ee4a CM |
11 | #include <linux/init.h> |
12 | #include <linux/kernel.h> | |
13 | #include <linux/module.h> | |
14 | #include <linux/slab.h> | |
15 | #include <linux/vmalloc.h> | |
16 | #include <linux/list.h> | |
17 | #include <linux/percpu.h> | |
18 | #include <linux/fdtable.h> | |
19 | ||
20 | #include <linux/kmemleak.h> | |
21 | ||
22 | struct test_node { | |
23 | long header[25]; | |
24 | struct list_head list; | |
25 | long footer[25]; | |
26 | }; | |
27 | ||
28 | static LIST_HEAD(test_list); | |
245b2e70 | 29 | static DEFINE_PER_CPU(void *, kmemleak_test_pointer); |
0822ee4a CM |
30 | |
31 | /* | |
32 | * Some very simple testing. This function needs to be extended for | |
33 | * proper testing. | |
34 | */ | |
35 | static int __init kmemleak_test_init(void) | |
36 | { | |
37 | struct test_node *elem; | |
38 | int i; | |
39 | ||
1170532b | 40 | pr_info("Kmemleak testing\n"); |
0822ee4a CM |
41 | |
42 | /* make some orphan objects */ | |
f59428ab FF |
43 | pr_info("kmalloc(32) = %p\n", kmalloc(32, GFP_KERNEL)); |
44 | pr_info("kmalloc(32) = %p\n", kmalloc(32, GFP_KERNEL)); | |
45 | pr_info("kmalloc(1024) = %p\n", kmalloc(1024, GFP_KERNEL)); | |
46 | pr_info("kmalloc(1024) = %p\n", kmalloc(1024, GFP_KERNEL)); | |
47 | pr_info("kmalloc(2048) = %p\n", kmalloc(2048, GFP_KERNEL)); | |
48 | pr_info("kmalloc(2048) = %p\n", kmalloc(2048, GFP_KERNEL)); | |
49 | pr_info("kmalloc(4096) = %p\n", kmalloc(4096, GFP_KERNEL)); | |
50 | pr_info("kmalloc(4096) = %p\n", kmalloc(4096, GFP_KERNEL)); | |
0822ee4a | 51 | #ifndef CONFIG_MODULES |
f59428ab | 52 | pr_info("kmem_cache_alloc(files_cachep) = %p\n", |
0822ee4a | 53 | kmem_cache_alloc(files_cachep, GFP_KERNEL)); |
f59428ab | 54 | pr_info("kmem_cache_alloc(files_cachep) = %p\n", |
0822ee4a CM |
55 | kmem_cache_alloc(files_cachep, GFP_KERNEL)); |
56 | #endif | |
f59428ab FF |
57 | pr_info("vmalloc(64) = %p\n", vmalloc(64)); |
58 | pr_info("vmalloc(64) = %p\n", vmalloc(64)); | |
59 | pr_info("vmalloc(64) = %p\n", vmalloc(64)); | |
60 | pr_info("vmalloc(64) = %p\n", vmalloc(64)); | |
61 | pr_info("vmalloc(64) = %p\n", vmalloc(64)); | |
0822ee4a CM |
62 | |
63 | /* | |
64 | * Add elements to a list. They should only appear as orphan | |
65 | * after the module is removed. | |
66 | */ | |
67 | for (i = 0; i < 10; i++) { | |
0a08739e | 68 | elem = kzalloc(sizeof(*elem), GFP_KERNEL); |
f59428ab | 69 | pr_info("kzalloc(sizeof(*elem)) = %p\n", elem); |
0822ee4a CM |
70 | if (!elem) |
71 | return -ENOMEM; | |
0822ee4a | 72 | INIT_LIST_HEAD(&elem->list); |
0822ee4a CM |
73 | list_add_tail(&elem->list, &test_list); |
74 | } | |
75 | ||
76 | for_each_possible_cpu(i) { | |
245b2e70 | 77 | per_cpu(kmemleak_test_pointer, i) = kmalloc(129, GFP_KERNEL); |
f59428ab | 78 | pr_info("kmalloc(129) = %p\n", |
245b2e70 | 79 | per_cpu(kmemleak_test_pointer, i)); |
0822ee4a CM |
80 | } |
81 | ||
82 | return 0; | |
83 | } | |
84 | module_init(kmemleak_test_init); | |
85 | ||
86 | static void __exit kmemleak_test_exit(void) | |
87 | { | |
88 | struct test_node *elem, *tmp; | |
89 | ||
90 | /* | |
91 | * Remove the list elements without actually freeing the | |
92 | * memory. | |
93 | */ | |
94 | list_for_each_entry_safe(elem, tmp, &test_list, list) | |
95 | list_del(&elem->list); | |
96 | } | |
97 | module_exit(kmemleak_test_exit); | |
98 | ||
99 | MODULE_LICENSE("GPL"); |