1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
|
#undef MEMDEBUG
#include <stdarg.h>
#include <stdlib.h>
#include <stdint.h>
#include <string.h>
#include <stdio.h>
#include <limits.h>
#include <signal.h>
#include "spinlock.h"
#include "list.h"
#define __init __attribute__((constructor))
#define __export __attribute__((visibility("default")))
#undef offsetof
#ifdef __compiler_offsetof
#define offsetof(TYPE,MEMBER) __compiler_offsetof(TYPE,MEMBER)
#else
#define offsetof(TYPE, MEMBER) ((size_t) &((TYPE *)0)->MEMBER)
#endif
#define container_of(ptr, type, member) ({ \
const typeof( ((type *)0)->member ) *__mptr = (ptr); \
(type *)( (char *)__mptr - offsetof(type,member) );})
#define MAGIC1 UINT64_C(0x1122334455667788)
struct mem_t
{
struct list_head entry;
const char *fname;
int line;
size_t size;
uint64_t magic2;
uint64_t magic1;
char data[0];
};
static LIST_HEAD(mem_list);
static spinlock_t mem_list_lock;
static struct mem_t *_md_malloc(size_t size, const char *fname, int line)
{
struct mem_t *mem = malloc(sizeof(*mem) + size + 8);
if (mem == NULL)
return NULL;
mem->fname = fname;
mem->line = line;
mem->size = size;
mem->magic1 = MAGIC1;
mem->magic2 = (uint64_t)random() * (uint64_t)random();
*(uint64_t*)(mem->data + size) = mem->magic2;
spin_lock(&mem_list_lock);
list_add_tail(&mem->entry, &mem_list);
spin_unlock(&mem_list_lock);
return mem;
}
void __export *md_malloc(size_t size, const char *fname, int line)
{
struct mem_t *mem = _md_malloc(size, fname, line);
return mem ? mem->data : NULL;
}
void __export md_free(void *ptr, const char *fname, int line)
{
struct mem_t *mem;
if (!ptr)
return;
mem = container_of(ptr, typeof(*mem), data);
if (mem->magic1 != MAGIC1) {
printf("memory corruption:\nfree at %s:%i\n", fname, line);
abort();
}
if (mem->magic2 != *(uint64_t*)(mem->data + mem->size)) {
printf("memory corruption:\nmalloc(%zu) at %s:%i\nfree at %s:%i\n",
mem->size, mem->fname, mem->line, fname, line);
abort();
}
mem->magic1 = 0;
mem->magic2 = 0;
spin_lock(&mem_list_lock);
list_del(&mem->entry);
spin_unlock(&mem_list_lock);
free(mem);
return;
}
void __export *md_realloc(void *ptr, size_t size, const char *fname, int line)
{
struct mem_t *mem = ptr ? container_of(ptr, typeof(*mem), data) : NULL;
struct mem_t *mem2;
if (mem) {
if (mem->magic1 != MAGIC1) {
printf("memory corruption:\nfree at %s:%i\n",
fname, line);
abort();
}
if (mem->magic2 != *(uint64_t*)(mem->data + mem->size)) {
printf("memory corruption:\nmalloc(%zu) at %s:%i\nfree at %s:%i\n",
mem->size, mem->fname, mem->line, fname, line);
abort();
}
if (size == 0) {
md_free(mem->data, fname, line);
return NULL;
}
}
mem2 = _md_malloc(size, fname, line);
if (mem2 == NULL)
return NULL;
if (mem) {
memcpy(mem2->data, mem->data,
(size < mem->size) ? size : mem->size);
md_free(mem->data, fname, line);
}
return mem2->data;
}
char __export *md_strdup(const char *ptr, const char *fname, int line)
{
size_t len = strlen(ptr);
char *str = md_malloc(len + 1, fname, line);
if (str)
memcpy(str, ptr, len + 1);
return str;
}
char __export *md_strndup(const char *ptr, size_t n, const char *fname, int line)
{
size_t len = strnlen(ptr, n);
char *str = md_malloc(len + 1, fname, line);
if (str) {
memcpy(str, ptr, len);
str[len] = '\0';
}
return str;
}
int __export md_asprintf(const char *fname, int line,
char **strp, const char *fmt, ...)
{
va_list ap;
va_list aq;
int len;
va_start(ap, fmt);
va_copy(aq, ap);
len = vsnprintf(NULL, 0, fmt, ap);
if (len < 0)
goto err;
*strp = md_malloc(len + 1, fname, line);
if (*strp == NULL)
goto err;
len = vsnprintf(*strp, len + 1, fmt, aq);
if (len < 0)
goto err_strp;
va_end(aq);
va_end(ap);
return len;
err_strp:
md_free(*strp, fname, line);
err:
va_end(aq);
va_end(ap);
return -1;
}
static void siginfo(int num)
{
struct mem_t *mem;
size_t total = 0;
spin_lock(&mem_list_lock);
list_for_each_entry(mem, &mem_list, entry) {
printf("%s:%i %lu\n", mem->fname, mem->line, (long unsigned)mem->size);
total += mem->size;
}
spin_unlock(&mem_list_lock);
printf("total = %lu\n", (long unsigned)total);
}
static void siginfo2(int num)
{
struct mem_t *mem;
spin_lock(&mem_list_lock);
list_for_each_entry(mem, &mem_list, entry) {
if (mem->magic1 != MAGIC1 || mem->magic2 != *(uint64_t*)(mem->data + mem->size))
printf("%s:%i %lu\n", mem->fname, mem->line, (long unsigned)mem->size);
}
spin_unlock(&mem_list_lock);
}
void __export md_check(void *ptr)
{
struct mem_t *mem = container_of(ptr, typeof(*mem), data);
if (!ptr)
abort();
if (mem->magic1 != MAGIC1)
abort();
if (mem->magic2 != *(uint64_t*)(mem->data + mem->size))
abort();
}
static void __init init(void)
{
spinlock_init(&mem_list_lock);
signal(36, siginfo);
signal(37, siginfo2);
}
|
