1 /*
2 * Copyright 2016-2022 The OpenSSL Project Authors. All Rights Reserved.
3 *
4 * Licensed under the Apache License 2.0 (the "License"). You may not use
5 * this file except in compliance with the License. You can obtain a copy
6 * in the file LICENSE in the source distribution or at
7 * https://www.openssl.org/source/license.html
8 */
9
10 /* We need to use the OPENSSL_fork_*() deprecated APIs */
11 #define OPENSSL_SUPPRESS_DEPRECATED
12
13 #include <openssl/crypto.h>
14 #include "internal/cryptlib.h"
15
16 #if defined(__sun)
17 # include <atomic.h>
18 #endif
19
20 #if defined(__apple_build_version__) && __apple_build_version__ < 6000000
21 /*
22 * OS/X 10.7 and 10.8 had a weird version of clang which has __ATOMIC_ACQUIRE and
23 * __ATOMIC_ACQ_REL but which expects only one parameter for __atomic_is_lock_free()
24 * rather than two which has signature __atomic_is_lock_free(sizeof(_Atomic(T))).
25 * All of this makes impossible to use __atomic_is_lock_free here.
26 *
27 * See: https://github.com/llvm/llvm-project/commit/a4c2602b714e6c6edb98164550a5ae829b2de760
28 */
29 #define BROKEN_CLANG_ATOMICS
30 #endif
31
32 #if defined(OPENSSL_THREADS) && !defined(CRYPTO_TDEBUG) && !defined(OPENSSL_SYS_WINDOWS)
33
34 # if defined(OPENSSL_SYS_UNIX)
35 # include <sys/types.h>
36 # include <unistd.h>
37 #endif
38
39 # include <assert.h>
40
41 # ifdef PTHREAD_RWLOCK_INITIALIZER
42 # define USE_RWLOCK
43 # endif
44
CRYPTO_THREAD_lock_new(void)45 CRYPTO_RWLOCK *CRYPTO_THREAD_lock_new(void)
46 {
47 # ifdef USE_RWLOCK
48 CRYPTO_RWLOCK *lock;
49
50 if ((lock = OPENSSL_zalloc(sizeof(pthread_rwlock_t))) == NULL) {
51 /* Don't set error, to avoid recursion blowup. */
52 return NULL;
53 }
54
55 if (pthread_rwlock_init(lock, NULL) != 0) {
56 OPENSSL_free(lock);
57 return NULL;
58 }
59 # else
60 pthread_mutexattr_t attr;
61 CRYPTO_RWLOCK *lock;
62
63 if ((lock = OPENSSL_zalloc(sizeof(pthread_mutex_t))) == NULL) {
64 /* Don't set error, to avoid recursion blowup. */
65 return NULL;
66 }
67
68 /*
69 * We don't use recursive mutexes, but try to catch errors if we do.
70 */
71 pthread_mutexattr_init(&attr);
72 # if !defined (__TANDEM) && !defined (_SPT_MODEL_)
73 # if !defined(NDEBUG) && !defined(OPENSSL_NO_MUTEX_ERRORCHECK)
74 pthread_mutexattr_settype(&attr, PTHREAD_MUTEX_ERRORCHECK);
75 # else
76 pthread_mutexattr_settype(&attr, PTHREAD_MUTEX_NORMAL);
77 # endif
78 # else
79 /* The SPT Thread Library does not define MUTEX attributes. */
80 # endif
81
82 if (pthread_mutex_init(lock, &attr) != 0) {
83 pthread_mutexattr_destroy(&attr);
84 OPENSSL_free(lock);
85 return NULL;
86 }
87
88 pthread_mutexattr_destroy(&attr);
89 # endif
90
91 return lock;
92 }
93
CRYPTO_THREAD_read_lock(CRYPTO_RWLOCK *lock)94 __owur int CRYPTO_THREAD_read_lock(CRYPTO_RWLOCK *lock)
95 {
96 # ifdef USE_RWLOCK
97 if (pthread_rwlock_rdlock(lock) != 0)
98 return 0;
99 # else
100 if (pthread_mutex_lock(lock) != 0) {
101 assert(errno != EDEADLK && errno != EBUSY);
102 return 0;
103 }
104 # endif
105
106 return 1;
107 }
108
CRYPTO_THREAD_write_lock(CRYPTO_RWLOCK *lock)109 __owur int CRYPTO_THREAD_write_lock(CRYPTO_RWLOCK *lock)
110 {
111 # ifdef USE_RWLOCK
112 if (pthread_rwlock_wrlock(lock) != 0)
113 return 0;
114 # else
115 if (pthread_mutex_lock(lock) != 0) {
116 assert(errno != EDEADLK && errno != EBUSY);
117 return 0;
118 }
119 # endif
120
121 return 1;
122 }
123
CRYPTO_THREAD_unlock(CRYPTO_RWLOCK *lock)124 int CRYPTO_THREAD_unlock(CRYPTO_RWLOCK *lock)
125 {
126 # ifdef USE_RWLOCK
127 if (pthread_rwlock_unlock(lock) != 0)
128 return 0;
129 # else
130 if (pthread_mutex_unlock(lock) != 0) {
131 assert(errno != EPERM);
132 return 0;
133 }
134 # endif
135
136 return 1;
137 }
138
CRYPTO_THREAD_lock_free(CRYPTO_RWLOCK *lock)139 void CRYPTO_THREAD_lock_free(CRYPTO_RWLOCK *lock)
140 {
141 if (lock == NULL)
142 return;
143
144 # ifdef USE_RWLOCK
145 pthread_rwlock_destroy(lock);
146 # else
147 pthread_mutex_destroy(lock);
148 # endif
149 OPENSSL_free(lock);
150
151 return;
152 }
153
CRYPTO_THREAD_run_once(CRYPTO_ONCE *once, void (*init)(void))154 int CRYPTO_THREAD_run_once(CRYPTO_ONCE *once, void (*init)(void))
155 {
156 if (pthread_once(once, init) != 0)
157 return 0;
158
159 return 1;
160 }
161
CRYPTO_THREAD_init_local(CRYPTO_THREAD_LOCAL *key, void (*cleanup)(void *))162 int CRYPTO_THREAD_init_local(CRYPTO_THREAD_LOCAL *key, void (*cleanup)(void *))
163 {
164 if (pthread_key_create(key, cleanup) != 0)
165 return 0;
166
167 return 1;
168 }
169
CRYPTO_THREAD_get_local(CRYPTO_THREAD_LOCAL *key)170 void *CRYPTO_THREAD_get_local(CRYPTO_THREAD_LOCAL *key)
171 {
172 return pthread_getspecific(*key);
173 }
174
CRYPTO_THREAD_set_local(CRYPTO_THREAD_LOCAL *key, void *val)175 int CRYPTO_THREAD_set_local(CRYPTO_THREAD_LOCAL *key, void *val)
176 {
177 if (pthread_setspecific(*key, val) != 0)
178 return 0;
179
180 return 1;
181 }
182
CRYPTO_THREAD_cleanup_local(CRYPTO_THREAD_LOCAL *key)183 int CRYPTO_THREAD_cleanup_local(CRYPTO_THREAD_LOCAL *key)
184 {
185 if (pthread_key_delete(*key) != 0)
186 return 0;
187
188 return 1;
189 }
190
CRYPTO_THREAD_get_current_id(void)191 CRYPTO_THREAD_ID CRYPTO_THREAD_get_current_id(void)
192 {
193 return pthread_self();
194 }
195
CRYPTO_THREAD_compare_id(CRYPTO_THREAD_ID a, CRYPTO_THREAD_ID b)196 int CRYPTO_THREAD_compare_id(CRYPTO_THREAD_ID a, CRYPTO_THREAD_ID b)
197 {
198 return pthread_equal(a, b);
199 }
200
CRYPTO_atomic_add(int *val, int amount, int *ret, CRYPTO_RWLOCK *lock)201 int CRYPTO_atomic_add(int *val, int amount, int *ret, CRYPTO_RWLOCK *lock)
202 {
203 # if defined(__GNUC__) && defined(__ATOMIC_ACQ_REL) && !defined(BROKEN_CLANG_ATOMICS)
204 if (__atomic_is_lock_free(sizeof(*val), val)) {
205 *ret = __atomic_add_fetch(val, amount, __ATOMIC_ACQ_REL);
206 return 1;
207 }
208 # elif defined(__sun) && (defined(__SunOS_5_10) || defined(__SunOS_5_11))
209 /* This will work for all future Solaris versions. */
210 if (ret != NULL) {
211 *ret = atomic_add_int_nv((volatile unsigned int *)val, amount);
212 return 1;
213 }
214 # endif
215 if (lock == NULL || !CRYPTO_THREAD_write_lock(lock))
216 return 0;
217
218 *val += amount;
219 *ret = *val;
220
221 if (!CRYPTO_THREAD_unlock(lock))
222 return 0;
223
224 return 1;
225 }
226
CRYPTO_atomic_or(uint64_t *val, uint64_t op, uint64_t *ret, CRYPTO_RWLOCK *lock)227 int CRYPTO_atomic_or(uint64_t *val, uint64_t op, uint64_t *ret,
228 CRYPTO_RWLOCK *lock)
229 {
230 # if defined(__GNUC__) && defined(__ATOMIC_ACQ_REL) && !defined(BROKEN_CLANG_ATOMICS)
231 if (__atomic_is_lock_free(sizeof(*val), val)) {
232 *ret = __atomic_or_fetch(val, op, __ATOMIC_ACQ_REL);
233 return 1;
234 }
235 # elif defined(__sun) && (defined(__SunOS_5_10) || defined(__SunOS_5_11))
236 /* This will work for all future Solaris versions. */
237 if (ret != NULL) {
238 *ret = atomic_or_64_nv(val, op);
239 return 1;
240 }
241 # endif
242 if (lock == NULL || !CRYPTO_THREAD_write_lock(lock))
243 return 0;
244 *val |= op;
245 *ret = *val;
246
247 if (!CRYPTO_THREAD_unlock(lock))
248 return 0;
249
250 return 1;
251 }
252
CRYPTO_atomic_load(uint64_t *val, uint64_t *ret, CRYPTO_RWLOCK *lock)253 int CRYPTO_atomic_load(uint64_t *val, uint64_t *ret, CRYPTO_RWLOCK *lock)
254 {
255 # if defined(__GNUC__) && defined(__ATOMIC_ACQUIRE) && !defined(BROKEN_CLANG_ATOMICS)
256 if (__atomic_is_lock_free(sizeof(*val), val)) {
257 __atomic_load(val, ret, __ATOMIC_ACQUIRE);
258 return 1;
259 }
260 # elif defined(__sun) && (defined(__SunOS_5_10) || defined(__SunOS_5_11))
261 /* This will work for all future Solaris versions. */
262 if (ret != NULL) {
263 *ret = atomic_or_64_nv(val, 0);
264 return 1;
265 }
266 # endif
267 if (lock == NULL || !CRYPTO_THREAD_read_lock(lock))
268 return 0;
269 *ret = *val;
270 if (!CRYPTO_THREAD_unlock(lock))
271 return 0;
272
273 return 1;
274 }
275 # ifndef FIPS_MODULE
openssl_init_fork_handlers(void)276 int openssl_init_fork_handlers(void)
277 {
278 return 1;
279 }
280 # endif /* FIPS_MODULE */
281
openssl_get_fork_id(void)282 int openssl_get_fork_id(void)
283 {
284 return getpid();
285 }
286 #endif
287