1 /* 2 * Copyright 2016-2023 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 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 # endif 76 # else 77 /* The SPT Thread Library does not define MUTEX attributes. */ 78 # endif 79 80 if (pthread_mutex_init(lock, &attr) != 0) { 81 pthread_mutexattr_destroy(&attr); 82 OPENSSL_free(lock); 83 return NULL; 84 } 85 86 pthread_mutexattr_destroy(&attr); 87 # endif 88 89 return lock; 90 } 91 92 __owur int CRYPTO_THREAD_read_lock(CRYPTO_RWLOCK *lock) 93 { 94 # ifdef USE_RWLOCK 95 if (pthread_rwlock_rdlock(lock) != 0) 96 return 0; 97 # else 98 if (pthread_mutex_lock(lock) != 0) { 99 assert(errno != EDEADLK && errno != EBUSY); 100 return 0; 101 } 102 # endif 103 104 return 1; 105 } 106 107 __owur int CRYPTO_THREAD_write_lock(CRYPTO_RWLOCK *lock) 108 { 109 # ifdef USE_RWLOCK 110 if (pthread_rwlock_wrlock(lock) != 0) 111 return 0; 112 # else 113 if (pthread_mutex_lock(lock) != 0) { 114 assert(errno != EDEADLK && errno != EBUSY); 115 return 0; 116 } 117 # endif 118 119 return 1; 120 } 121 122 int CRYPTO_THREAD_unlock(CRYPTO_RWLOCK *lock) 123 { 124 # ifdef USE_RWLOCK 125 if (pthread_rwlock_unlock(lock) != 0) 126 return 0; 127 # else 128 if (pthread_mutex_unlock(lock) != 0) { 129 assert(errno != EPERM); 130 return 0; 131 } 132 # endif 133 134 return 1; 135 } 136 137 void CRYPTO_THREAD_lock_free(CRYPTO_RWLOCK *lock) 138 { 139 if (lock == NULL) 140 return; 141 142 # ifdef USE_RWLOCK 143 pthread_rwlock_destroy(lock); 144 # else 145 pthread_mutex_destroy(lock); 146 # endif 147 OPENSSL_free(lock); 148 149 return; 150 } 151 152 int CRYPTO_THREAD_run_once(CRYPTO_ONCE *once, void (*init)(void)) 153 { 154 if (pthread_once(once, init) != 0) 155 return 0; 156 157 return 1; 158 } 159 160 int CRYPTO_THREAD_init_local(CRYPTO_THREAD_LOCAL *key, void (*cleanup)(void *)) 161 { 162 if (pthread_key_create(key, cleanup) != 0) 163 return 0; 164 165 return 1; 166 } 167 168 void *CRYPTO_THREAD_get_local(CRYPTO_THREAD_LOCAL *key) 169 { 170 return pthread_getspecific(*key); 171 } 172 173 int CRYPTO_THREAD_set_local(CRYPTO_THREAD_LOCAL *key, void *val) 174 { 175 if (pthread_setspecific(*key, val) != 0) 176 return 0; 177 178 return 1; 179 } 180 181 int CRYPTO_THREAD_cleanup_local(CRYPTO_THREAD_LOCAL *key) 182 { 183 if (pthread_key_delete(*key) != 0) 184 return 0; 185 186 return 1; 187 } 188 189 CRYPTO_THREAD_ID CRYPTO_THREAD_get_current_id(void) 190 { 191 return pthread_self(); 192 } 193 194 int CRYPTO_THREAD_compare_id(CRYPTO_THREAD_ID a, CRYPTO_THREAD_ID b) 195 { 196 return pthread_equal(a, b); 197 } 198 199 int CRYPTO_atomic_add(int *val, int amount, int *ret, CRYPTO_RWLOCK *lock) 200 { 201 # if defined(__GNUC__) && defined(__ATOMIC_ACQ_REL) && !defined(BROKEN_CLANG_ATOMICS) 202 if (__atomic_is_lock_free(sizeof(*val), val)) { 203 *ret = __atomic_add_fetch(val, amount, __ATOMIC_ACQ_REL); 204 return 1; 205 } 206 # elif defined(__sun) && (defined(__SunOS_5_10) || defined(__SunOS_5_11)) 207 /* This will work for all future Solaris versions. */ 208 if (ret != NULL) { 209 *ret = atomic_add_int_nv((volatile unsigned int *)val, amount); 210 return 1; 211 } 212 # endif 213 if (lock == NULL || !CRYPTO_THREAD_write_lock(lock)) 214 return 0; 215 216 *val += amount; 217 *ret = *val; 218 219 if (!CRYPTO_THREAD_unlock(lock)) 220 return 0; 221 222 return 1; 223 } 224 225 int CRYPTO_atomic_or(uint64_t *val, uint64_t op, uint64_t *ret, 226 CRYPTO_RWLOCK *lock) 227 { 228 # if defined(__GNUC__) && defined(__ATOMIC_ACQ_REL) && !defined(BROKEN_CLANG_ATOMICS) 229 if (__atomic_is_lock_free(sizeof(*val), val)) { 230 *ret = __atomic_or_fetch(val, op, __ATOMIC_ACQ_REL); 231 return 1; 232 } 233 # elif defined(__sun) && (defined(__SunOS_5_10) || defined(__SunOS_5_11)) 234 /* This will work for all future Solaris versions. */ 235 if (ret != NULL) { 236 *ret = atomic_or_64_nv(val, op); 237 return 1; 238 } 239 # endif 240 if (lock == NULL || !CRYPTO_THREAD_write_lock(lock)) 241 return 0; 242 *val |= op; 243 *ret = *val; 244 245 if (!CRYPTO_THREAD_unlock(lock)) 246 return 0; 247 248 return 1; 249 } 250 251 int CRYPTO_atomic_load(uint64_t *val, uint64_t *ret, CRYPTO_RWLOCK *lock) 252 { 253 # if defined(__GNUC__) && defined(__ATOMIC_ACQUIRE) && !defined(BROKEN_CLANG_ATOMICS) 254 if (__atomic_is_lock_free(sizeof(*val), val)) { 255 __atomic_load(val, ret, __ATOMIC_ACQUIRE); 256 return 1; 257 } 258 # elif defined(__sun) && (defined(__SunOS_5_10) || defined(__SunOS_5_11)) 259 /* This will work for all future Solaris versions. */ 260 if (ret != NULL) { 261 *ret = atomic_or_64_nv(val, 0); 262 return 1; 263 } 264 # endif 265 if (lock == NULL || !CRYPTO_THREAD_read_lock(lock)) 266 return 0; 267 *ret = *val; 268 if (!CRYPTO_THREAD_unlock(lock)) 269 return 0; 270 271 return 1; 272 } 273 # ifndef FIPS_MODULE 274 int openssl_init_fork_handlers(void) 275 { 276 return 1; 277 } 278 # endif /* FIPS_MODULE */ 279 280 int openssl_get_fork_id(void) 281 { 282 return getpid(); 283 } 284 #endif 285