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/*
* Copyright 2016-2022 The OpenSSL Project Authors. All Rights Reserved.
*
* Licensed under the Apache License 2.0 (the "License"). You may not use
* this file except in compliance with the License. You can obtain a copy
* in the file LICENSE in the source distribution or at
* https://www.openssl.org/source/license.html
*/
/* We need to use the OPENSSL_fork_*() deprecated APIs */
#define OPENSSL_SUPPRESS_DEPRECATED
#include <openssl/crypto.h>
#include "internal/cryptlib.h"
#if defined(__sun)
# include <atomic.h>
#endif
#if defined(__apple_build_version__) && __apple_build_version__ < 6000000
/*
* OS/X 10.7 and 10.8 had a weird version of clang which has __ATOMIC_ACQUIRE and
* __ATOMIC_ACQ_REL but which expects only one parameter for __atomic_is_lock_free()
* rather than two which has signature __atomic_is_lock_free(sizeof(_Atomic(T))).
* All of this makes impossible to use __atomic_is_lock_free here.
*
* See: https://github.com/llvm/llvm-project/commit/a4c2602b714e6c6edb98164550a5ae829b2de760
*/
#define BROKEN_CLANG_ATOMICS
#endif
#if defined(OPENSSL_THREADS) && !defined(CRYPTO_TDEBUG) && !defined(OPENSSL_SYS_WINDOWS)
# if defined(OPENSSL_SYS_UNIX)
# include <sys/types.h>
# include <unistd.h>
#endif
# include <assert.h>
# ifdef PTHREAD_RWLOCK_INITIALIZER
# define USE_RWLOCK
# endif
CRYPTO_RWLOCK *CRYPTO_THREAD_lock_new(void)
{
# ifdef USE_RWLOCK
CRYPTO_RWLOCK *lock;
if ((lock = OPENSSL_zalloc(sizeof(pthread_rwlock_t))) == NULL) {
/* Don't set error, to avoid recursion blowup. */
return NULL;
}
if (pthread_rwlock_init(lock, NULL) != 0) {
OPENSSL_free(lock);
return NULL;
}
# else
pthread_mutexattr_t attr;
CRYPTO_RWLOCK *lock;
if ((lock = OPENSSL_zalloc(sizeof(pthread_mutex_t))) == NULL) {
/* Don't set error, to avoid recursion blowup. */
return NULL;
}
/*
* We don't use recursive mutexes, but try to catch errors if we do.
*/
pthread_mutexattr_init(&attr);
# if !defined (__TANDEM) && !defined (_SPT_MODEL_)
# if !defined(NDEBUG) && !defined(OPENSSL_NO_MUTEX_ERRORCHECK)
pthread_mutexattr_settype(&attr, PTHREAD_MUTEX_ERRORCHECK);
# else
pthread_mutexattr_settype(&attr, PTHREAD_MUTEX_NORMAL);
# endif
# else
/* The SPT Thread Library does not define MUTEX attributes. */
# endif
if (pthread_mutex_init(lock, &attr) != 0) {
pthread_mutexattr_destroy(&attr);
OPENSSL_free(lock);
return NULL;
}
pthread_mutexattr_destroy(&attr);
# endif
return lock;
}
__owur int CRYPTO_THREAD_read_lock(CRYPTO_RWLOCK *lock)
{
# ifdef USE_RWLOCK
if (pthread_rwlock_rdlock(lock) != 0)
return 0;
# else
if (pthread_mutex_lock(lock) != 0) {
assert(errno != EDEADLK && errno != EBUSY);
return 0;
}
# endif
return 1;
}
__owur int CRYPTO_THREAD_write_lock(CRYPTO_RWLOCK *lock)
{
# ifdef USE_RWLOCK
if (pthread_rwlock_wrlock(lock) != 0)
return 0;
# else
if (pthread_mutex_lock(lock) != 0) {
assert(errno != EDEADLK && errno != EBUSY);
return 0;
}
# endif
return 1;
}
int CRYPTO_THREAD_unlock(CRYPTO_RWLOCK *lock)
{
# ifdef USE_RWLOCK
if (pthread_rwlock_unlock(lock) != 0)
return 0;
# else
if (pthread_mutex_unlock(lock) != 0) {
assert(errno != EPERM);
return 0;
}
# endif
return 1;
}
void CRYPTO_THREAD_lock_free(CRYPTO_RWLOCK *lock)
{
if (lock == NULL)
return;
# ifdef USE_RWLOCK
pthread_rwlock_destroy(lock);
# else
pthread_mutex_destroy(lock);
# endif
OPENSSL_free(lock);
return;
}
int CRYPTO_THREAD_run_once(CRYPTO_ONCE *once, void (*init)(void))
{
if (pthread_once(once, init) != 0)
return 0;
return 1;
}
int CRYPTO_THREAD_init_local(CRYPTO_THREAD_LOCAL *key, void (*cleanup)(void *))
{
if (pthread_key_create(key, cleanup) != 0)
return 0;
return 1;
}
void *CRYPTO_THREAD_get_local(CRYPTO_THREAD_LOCAL *key)
{
return pthread_getspecific(*key);
}
int CRYPTO_THREAD_set_local(CRYPTO_THREAD_LOCAL *key, void *val)
{
if (pthread_setspecific(*key, val) != 0)
return 0;
return 1;
}
int CRYPTO_THREAD_cleanup_local(CRYPTO_THREAD_LOCAL *key)
{
if (pthread_key_delete(*key) != 0)
return 0;
return 1;
}
CRYPTO_THREAD_ID CRYPTO_THREAD_get_current_id(void)
{
return pthread_self();
}
int CRYPTO_THREAD_compare_id(CRYPTO_THREAD_ID a, CRYPTO_THREAD_ID b)
{
return pthread_equal(a, b);
}
int CRYPTO_atomic_add(int *val, int amount, int *ret, CRYPTO_RWLOCK *lock)
{
# if defined(__GNUC__) && defined(__ATOMIC_ACQ_REL) && !defined(BROKEN_CLANG_ATOMICS)
if (__atomic_is_lock_free(sizeof(*val), val)) {
*ret = __atomic_add_fetch(val, amount, __ATOMIC_ACQ_REL);
return 1;
}
# elif defined(__sun) && (defined(__SunOS_5_10) || defined(__SunOS_5_11))
/* This will work for all future Solaris versions. */
if (ret != NULL) {
*ret = atomic_add_int_nv((volatile unsigned int *)val, amount);
return 1;
}
# endif
if (lock == NULL || !CRYPTO_THREAD_write_lock(lock))
return 0;
*val += amount;
*ret = *val;
if (!CRYPTO_THREAD_unlock(lock))
return 0;
return 1;
}
int CRYPTO_atomic_or(uint64_t *val, uint64_t op, uint64_t *ret,
CRYPTO_RWLOCK *lock)
{
# if defined(__GNUC__) && defined(__ATOMIC_ACQ_REL) && !defined(BROKEN_CLANG_ATOMICS)
if (__atomic_is_lock_free(sizeof(*val), val)) {
*ret = __atomic_or_fetch(val, op, __ATOMIC_ACQ_REL);
return 1;
}
# elif defined(__sun) && (defined(__SunOS_5_10) || defined(__SunOS_5_11))
/* This will work for all future Solaris versions. */
if (ret != NULL) {
*ret = atomic_or_64_nv(val, op);
return 1;
}
# endif
if (lock == NULL || !CRYPTO_THREAD_write_lock(lock))
return 0;
*val |= op;
*ret = *val;
if (!CRYPTO_THREAD_unlock(lock))
return 0;
return 1;
}
int CRYPTO_atomic_load(uint64_t *val, uint64_t *ret, CRYPTO_RWLOCK *lock)
{
# if defined(__GNUC__) && defined(__ATOMIC_ACQUIRE) && !defined(BROKEN_CLANG_ATOMICS)
if (__atomic_is_lock_free(sizeof(*val), val)) {
__atomic_load(val, ret, __ATOMIC_ACQUIRE);
return 1;
}
# elif defined(__sun) && (defined(__SunOS_5_10) || defined(__SunOS_5_11))
/* This will work for all future Solaris versions. */
if (ret != NULL) {
*ret = atomic_or_64_nv(val, 0);
return 1;
}
# endif
if (lock == NULL || !CRYPTO_THREAD_read_lock(lock))
return 0;
*ret = *val;
if (!CRYPTO_THREAD_unlock(lock))
return 0;
return 1;
}
# ifndef FIPS_MODULE
int openssl_init_fork_handlers(void)
{
return 1;
}
# endif /* FIPS_MODULE */
int openssl_get_fork_id(void)
{
return getpid();
}
#endif
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