1 /*
2 * mm/kmemleak-test.c
3 *
4 * Copyright (C) 2008 ARM Limited
5 * Written by Catalin Marinas <catalin.marinas@arm.com>
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
19 */
20
21 #define pr_fmt(fmt) "kmemleak: " fmt
22
23 #include <linux/init.h>
24 #include <linux/kernel.h>
25 #include <linux/module.h>
26 #include <linux/slab.h>
27 #include <linux/vmalloc.h>
28 #include <linux/list.h>
29 #include <linux/percpu.h>
30 #include <linux/fdtable.h>
31
32 #include <linux/kmemleak.h>
33
34 struct test_node {
35 long header[25];
36 struct list_head list;
37 long footer[25];
38 };
39
40 static LIST_HEAD(test_list);
41 static DEFINE_PER_CPU(void *, kmemleak_test_pointer);
42
43 /*
44 * Some very simple testing. This function needs to be extended for
45 * proper testing.
46 */
kmemleak_test_init(void)47 static int __init kmemleak_test_init(void)
48 {
49 struct test_node *elem;
50 int i;
51
52 pr_info("Kmemleak testing\n");
53
54 /* make some orphan objects */
55 pr_info("kmalloc(32) = %p\n", kmalloc(32, GFP_KERNEL));
56 pr_info("kmalloc(32) = %p\n", kmalloc(32, GFP_KERNEL));
57 pr_info("kmalloc(1024) = %p\n", kmalloc(1024, GFP_KERNEL));
58 pr_info("kmalloc(1024) = %p\n", kmalloc(1024, GFP_KERNEL));
59 pr_info("kmalloc(2048) = %p\n", kmalloc(2048, GFP_KERNEL));
60 pr_info("kmalloc(2048) = %p\n", kmalloc(2048, GFP_KERNEL));
61 pr_info("kmalloc(4096) = %p\n", kmalloc(4096, GFP_KERNEL));
62 pr_info("kmalloc(4096) = %p\n", kmalloc(4096, GFP_KERNEL));
63 #ifndef CONFIG_MODULES
64 pr_info("kmem_cache_alloc(files_cachep) = %p\n",
65 kmem_cache_alloc(files_cachep, GFP_KERNEL));
66 pr_info("kmem_cache_alloc(files_cachep) = %p\n",
67 kmem_cache_alloc(files_cachep, GFP_KERNEL));
68 #endif
69 pr_info("vmalloc(64) = %p\n", vmalloc(64));
70 pr_info("vmalloc(64) = %p\n", vmalloc(64));
71 pr_info("vmalloc(64) = %p\n", vmalloc(64));
72 pr_info("vmalloc(64) = %p\n", vmalloc(64));
73 pr_info("vmalloc(64) = %p\n", vmalloc(64));
74
75 /*
76 * Add elements to a list. They should only appear as orphan
77 * after the module is removed.
78 */
79 for (i = 0; i < 10; i++) {
80 elem = kzalloc(sizeof(*elem), GFP_KERNEL);
81 pr_info("kzalloc(sizeof(*elem)) = %p\n", elem);
82 if (!elem)
83 return -ENOMEM;
84 INIT_LIST_HEAD(&elem->list);
85 list_add_tail(&elem->list, &test_list);
86 }
87
88 for_each_possible_cpu(i) {
89 per_cpu(kmemleak_test_pointer, i) = kmalloc(129, GFP_KERNEL);
90 pr_info("kmalloc(129) = %p\n",
91 per_cpu(kmemleak_test_pointer, i));
92 }
93
94 return 0;
95 }
96 module_init(kmemleak_test_init);
97
kmemleak_test_exit(void)98 static void __exit kmemleak_test_exit(void)
99 {
100 struct test_node *elem, *tmp;
101
102 /*
103 * Remove the list elements without actually freeing the
104 * memory.
105 */
106 list_for_each_entry_safe(elem, tmp, &test_list, list)
107 list_del(&elem->list);
108 }
109 module_exit(kmemleak_test_exit);
110
111 MODULE_LICENSE("GPL");
112
