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
|
/* Copyright (c) 2015, Google Inc.
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
* SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
* OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
* CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. */
#include "internal.h"
#if defined(OPENSSL_PTHREADS)
#include <pthread.h>
#include <stdlib.h>
#include <string.h>
#include <openssl/mem.h>
#include <openssl/type_check.h>
OPENSSL_STATIC_ASSERT(sizeof(CRYPTO_MUTEX) >= sizeof(pthread_rwlock_t),
"CRYPTO_MUTEX is too small");
void CRYPTO_MUTEX_init(CRYPTO_MUTEX *lock) {
if (pthread_rwlock_init((pthread_rwlock_t *) lock, NULL) != 0) {
abort();
}
}
void CRYPTO_MUTEX_lock_read(CRYPTO_MUTEX *lock) {
if (pthread_rwlock_rdlock((pthread_rwlock_t *) lock) != 0) {
abort();
}
}
void CRYPTO_MUTEX_lock_write(CRYPTO_MUTEX *lock) {
if (pthread_rwlock_wrlock((pthread_rwlock_t *) lock) != 0) {
abort();
}
}
void CRYPTO_MUTEX_unlock_read(CRYPTO_MUTEX *lock) {
if (pthread_rwlock_unlock((pthread_rwlock_t *) lock) != 0) {
abort();
}
}
void CRYPTO_MUTEX_unlock_write(CRYPTO_MUTEX *lock) {
if (pthread_rwlock_unlock((pthread_rwlock_t *) lock) != 0) {
abort();
}
}
void CRYPTO_MUTEX_cleanup(CRYPTO_MUTEX *lock) {
pthread_rwlock_destroy((pthread_rwlock_t *) lock);
}
void CRYPTO_STATIC_MUTEX_lock_read(struct CRYPTO_STATIC_MUTEX *lock) {
if (pthread_rwlock_rdlock(&lock->lock) != 0) {
abort();
}
}
void CRYPTO_STATIC_MUTEX_lock_write(struct CRYPTO_STATIC_MUTEX *lock) {
if (pthread_rwlock_wrlock(&lock->lock) != 0) {
abort();
}
}
void CRYPTO_STATIC_MUTEX_unlock_read(struct CRYPTO_STATIC_MUTEX *lock) {
if (pthread_rwlock_unlock(&lock->lock) != 0) {
abort();
}
}
void CRYPTO_STATIC_MUTEX_unlock_write(struct CRYPTO_STATIC_MUTEX *lock) {
if (pthread_rwlock_unlock(&lock->lock) != 0) {
abort();
}
}
void CRYPTO_once(CRYPTO_once_t *once, void (*init)(void)) {
if (pthread_once(once, init) != 0) {
abort();
}
}
static pthread_mutex_t g_destructors_lock = PTHREAD_MUTEX_INITIALIZER;
static thread_local_destructor_t g_destructors[NUM_OPENSSL_THREAD_LOCALS];
// thread_local_destructor is called when a thread exits. It releases thread
// local data for that thread only.
static void thread_local_destructor(void *arg) {
if (arg == NULL) {
return;
}
thread_local_destructor_t destructors[NUM_OPENSSL_THREAD_LOCALS];
if (pthread_mutex_lock(&g_destructors_lock) != 0) {
return;
}
OPENSSL_memcpy(destructors, g_destructors, sizeof(destructors));
pthread_mutex_unlock(&g_destructors_lock);
unsigned i;
void **pointers = arg;
for (i = 0; i < NUM_OPENSSL_THREAD_LOCALS; i++) {
if (destructors[i] != NULL) {
destructors[i](pointers[i]);
}
}
OPENSSL_free(pointers);
}
static pthread_once_t g_thread_local_init_once = PTHREAD_ONCE_INIT;
static pthread_key_t g_thread_local_key;
static int g_thread_local_key_created = 0;
// OPENSSL_DANGEROUS_RELEASE_PTHREAD_KEY can be defined to cause
// |pthread_key_delete| to be called in a destructor function. This can be
// useful for programs that dlclose BoringSSL.
//
// Note that dlclose()ing BoringSSL is not supported and will leak memory:
// thread-local values will be leaked as well as anything initialised via a
// once. The |pthread_key_t| is destroyed because they run out very quickly,
// while the other leaks are slow, and this allows code that happens to use
// dlclose() despite all the problems to continue functioning.
//
// This is marked "dangerous" because it can cause multi-threaded processes to
// crash (even if they don't use dlclose): if the destructor runs while other
// threads are still executing then they may end up using an invalid key to
// access thread-local variables.
//
// This may be removed after February 2020.
#if defined(OPENSSL_DANGEROUS_RELEASE_PTHREAD_KEY) && \
(defined(__GNUC__) || defined(__clang__))
// thread_key_destructor is called when the library is unloaded with dlclose.
static void thread_key_destructor(void) __attribute__((destructor, unused));
static void thread_key_destructor(void) {
if (g_thread_local_key_created) {
g_thread_local_key_created = 0;
pthread_key_delete(g_thread_local_key);
}
}
#endif
static void thread_local_init(void) {
g_thread_local_key_created =
pthread_key_create(&g_thread_local_key, thread_local_destructor) == 0;
}
void *CRYPTO_get_thread_local(thread_local_data_t index) {
CRYPTO_once(&g_thread_local_init_once, thread_local_init);
if (!g_thread_local_key_created) {
return NULL;
}
void **pointers = pthread_getspecific(g_thread_local_key);
if (pointers == NULL) {
return NULL;
}
return pointers[index];
}
int CRYPTO_set_thread_local(thread_local_data_t index, void *value,
thread_local_destructor_t destructor) {
CRYPTO_once(&g_thread_local_init_once, thread_local_init);
if (!g_thread_local_key_created) {
destructor(value);
return 0;
}
void **pointers = pthread_getspecific(g_thread_local_key);
if (pointers == NULL) {
pointers = OPENSSL_malloc(sizeof(void *) * NUM_OPENSSL_THREAD_LOCALS);
if (pointers == NULL) {
destructor(value);
return 0;
}
OPENSSL_memset(pointers, 0, sizeof(void *) * NUM_OPENSSL_THREAD_LOCALS);
if (pthread_setspecific(g_thread_local_key, pointers) != 0) {
OPENSSL_free(pointers);
destructor(value);
return 0;
}
}
if (pthread_mutex_lock(&g_destructors_lock) != 0) {
destructor(value);
return 0;
}
g_destructors[index] = destructor;
pthread_mutex_unlock(&g_destructors_lock);
pointers[index] = value;
return 1;
}
#endif // OPENSSL_PTHREADS
|
