FreeBSD/Linux Kernel Cross Reference
sys/vm/uma_dbg.c
1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
3 *
4 * Copyright (c) 2002, 2003, 2004, 2005 Jeffrey Roberson <jeff@FreeBSD.org>
5 * Copyright (c) 2004, 2005 Bosko Milekic <bmilekic@FreeBSD.org>
6 * All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 * notice unmodified, this list of conditions, and the following
13 * disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in the
16 * documentation and/or other materials provided with the distribution.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
19 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
20 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
21 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
22 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
23 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
24 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
25 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
26 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
27 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28 */
29
30 /*
31 * uma_dbg.c Debugging features for UMA users
32 *
33 */
34
35 #include <sys/cdefs.h>
36 __FBSDID("$FreeBSD$");
37
38 #include "opt_vm.h"
39
40 #include <sys/param.h>
41 #include <sys/systm.h>
42 #include <sys/bitset.h>
43 #include <sys/kernel.h>
44 #include <sys/types.h>
45 #include <sys/queue.h>
46 #include <sys/lock.h>
47 #include <sys/mutex.h>
48 #include <sys/malloc.h>
49
50 #include <vm/vm.h>
51 #include <vm/vm_object.h>
52 #include <vm/vm_page.h>
53 #include <vm/uma.h>
54 #include <vm/uma_int.h>
55 #include <vm/uma_dbg.h>
56 #include <vm/memguard.h>
57
58 static const uint32_t uma_junk = 0xdeadc0de;
59
60 /*
61 * Checks an item to make sure it hasn't been overwritten since it was freed,
62 * prior to subsequent reallocation.
63 *
64 * Complies with standard ctor arg/return
65 */
66 int
67 trash_ctor(void *mem, int size, void *arg, int flags)
68 {
69 int cnt;
70 uint32_t *p;
71
72 #ifdef DEBUG_MEMGUARD
73 if (is_memguard_addr(mem))
74 return (0);
75 #endif
76
77 cnt = size / sizeof(uma_junk);
78
79 for (p = mem; cnt > 0; cnt--, p++)
80 if (*p != uma_junk) {
81 #ifdef INVARIANTS
82 panic("Memory modified after free %p(%d) val=%x @ %p\n",
83 mem, size, *p, p);
84 #else
85 printf("Memory modified after free %p(%d) val=%x @ %p\n",
86 mem, size, *p, p);
87 #endif
88 return (0);
89 }
90 return (0);
91 }
92
93 /*
94 * Fills an item with predictable garbage
95 *
96 * Complies with standard dtor arg/return
97 *
98 */
99 void
100 trash_dtor(void *mem, int size, void *arg)
101 {
102 int cnt;
103 uint32_t *p;
104
105 #ifdef DEBUG_MEMGUARD
106 if (is_memguard_addr(mem))
107 return;
108 #endif
109
110 cnt = size / sizeof(uma_junk);
111
112 for (p = mem; cnt > 0; cnt--, p++)
113 *p = uma_junk;
114 }
115
116 /*
117 * Fills an item with predictable garbage
118 *
119 * Complies with standard init arg/return
120 *
121 */
122 int
123 trash_init(void *mem, int size, int flags)
124 {
125 trash_dtor(mem, size, NULL);
126 return (0);
127 }
128
129 /*
130 * Checks an item to make sure it hasn't been overwritten since it was freed.
131 *
132 * Complies with standard fini arg/return
133 *
134 */
135 void
136 trash_fini(void *mem, int size)
137 {
138 (void)trash_ctor(mem, size, NULL, 0);
139 }
140
141 int
142 mtrash_ctor(void *mem, int size, void *arg, int flags)
143 {
144 struct malloc_type **ksp;
145 uint32_t *p = mem;
146 int cnt;
147
148 #ifdef DEBUG_MEMGUARD
149 if (is_memguard_addr(mem))
150 return (0);
151 #endif
152
153 size -= sizeof(struct malloc_type *);
154 ksp = (struct malloc_type **)mem;
155 ksp += size / sizeof(struct malloc_type *);
156 cnt = size / sizeof(uma_junk);
157
158 for (p = mem; cnt > 0; cnt--, p++)
159 if (*p != uma_junk) {
160 printf("Memory modified after free %p(%d) val=%x @ %p\n",
161 mem, size, *p, p);
162 panic("Most recently used by %s\n", (*ksp == NULL)?
163 "none" : (*ksp)->ks_shortdesc);
164 }
165 return (0);
166 }
167
168 /*
169 * Fills an item with predictable garbage
170 *
171 * Complies with standard dtor arg/return
172 *
173 */
174 void
175 mtrash_dtor(void *mem, int size, void *arg)
176 {
177 int cnt;
178 uint32_t *p;
179
180 #ifdef DEBUG_MEMGUARD
181 if (is_memguard_addr(mem))
182 return;
183 #endif
184
185 size -= sizeof(struct malloc_type *);
186 cnt = size / sizeof(uma_junk);
187
188 for (p = mem; cnt > 0; cnt--, p++)
189 *p = uma_junk;
190 }
191
192 /*
193 * Fills an item with predictable garbage
194 *
195 * Complies with standard init arg/return
196 *
197 */
198 int
199 mtrash_init(void *mem, int size, int flags)
200 {
201 struct malloc_type **ksp;
202
203 #ifdef DEBUG_MEMGUARD
204 if (is_memguard_addr(mem))
205 return (0);
206 #endif
207
208 mtrash_dtor(mem, size, NULL);
209
210 ksp = (struct malloc_type **)mem;
211 ksp += (size / sizeof(struct malloc_type *)) - 1;
212 *ksp = NULL;
213 return (0);
214 }
215
216 /*
217 * Checks an item to make sure it hasn't been overwritten since it was freed,
218 * prior to freeing it back to available memory.
219 *
220 * Complies with standard fini arg/return
221 *
222 */
223 void
224 mtrash_fini(void *mem, int size)
225 {
226 (void)mtrash_ctor(mem, size, NULL, 0);
227 }
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