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/*
* Threading abstraction layer
*
* Copyright The Mbed TLS Contributors
* SPDX-License-Identifier: Apache-2.0 OR GPL-2.0-or-later
*/
/*
* Ensure gmtime_r is available even with -std=c99; must be defined before
* mbedtls_config.h, which pulls in glibc's features.h. Harmless on other platforms.
*/
#if !defined(_POSIX_C_SOURCE)
#define _POSIX_C_SOURCE 200112L
#endif
#include "common.h"
#if defined(MBEDTLS_THREADING_C)
#include "mbedtls/threading.h"
#if defined(MBEDTLS_HAVE_TIME_DATE) && !defined(MBEDTLS_PLATFORM_GMTIME_R_ALT)
#if !defined(_WIN32) && (defined(unix) || \
defined(__unix) || defined(__unix__) || (defined(__APPLE__) && \
defined(__MACH__)))
#include <unistd.h>
#endif /* !_WIN32 && (unix || __unix || __unix__ ||
* (__APPLE__ && __MACH__)) */
#if !((defined(_POSIX_VERSION) && _POSIX_VERSION >= 200809L) || \
(defined(_POSIX_THREAD_SAFE_FUNCTIONS) && \
_POSIX_THREAD_SAFE_FUNCTIONS >= 200112L))
/*
* This is a convenience shorthand macro to avoid checking the long
* preprocessor conditions above. Ideally, we could expose this macro in
* platform_util.h and simply use it in platform_util.c, threading.c and
* threading.h. However, this macro is not part of the Mbed TLS public API, so
* we keep it private by only defining it in this file
*/
#if !(defined(_WIN32) && !defined(EFIX64) && !defined(EFI32))
#define THREADING_USE_GMTIME
#endif /* ! ( defined(_WIN32) && !defined(EFIX64) && !defined(EFI32) ) */
#endif /* !( ( defined(_POSIX_VERSION) && _POSIX_VERSION >= 200809L ) || \
( defined(_POSIX_THREAD_SAFE_FUNCTIONS ) && \
_POSIX_THREAD_SAFE_FUNCTIONS >= 200112L ) ) */
#endif /* MBEDTLS_HAVE_TIME_DATE && !MBEDTLS_PLATFORM_GMTIME_R_ALT */
#if defined(MBEDTLS_THREADING_PTHREAD)
static void threading_mutex_init_pthread(mbedtls_threading_mutex_t *mutex)
{
if (mutex == NULL) {
return;
}
/* One problem here is that calling lock on a pthread mutex without first
* having initialised it is undefined behaviour. Obviously we cannot check
* this here in a thread safe manner without a significant performance
* hit, so state transitions are checked in tests only via the state
* variable. Please make sure any new mutex that gets added is exercised in
* tests; see tests/src/threading_helpers.c for more details. */
(void) pthread_mutex_init(&mutex->mutex, NULL);
}
static void threading_mutex_free_pthread(mbedtls_threading_mutex_t *mutex)
{
if (mutex == NULL) {
return;
}
(void) pthread_mutex_destroy(&mutex->mutex);
}
static int threading_mutex_lock_pthread(mbedtls_threading_mutex_t *mutex)
{
if (mutex == NULL) {
return MBEDTLS_ERR_THREADING_BAD_INPUT_DATA;
}
if (pthread_mutex_lock(&mutex->mutex) != 0) {
return MBEDTLS_ERR_THREADING_MUTEX_ERROR;
}
return 0;
}
static int threading_mutex_unlock_pthread(mbedtls_threading_mutex_t *mutex)
{
if (mutex == NULL) {
return MBEDTLS_ERR_THREADING_BAD_INPUT_DATA;
}
if (pthread_mutex_unlock(&mutex->mutex) != 0) {
return MBEDTLS_ERR_THREADING_MUTEX_ERROR;
}
return 0;
}
void (*mbedtls_mutex_init)(mbedtls_threading_mutex_t *) = threading_mutex_init_pthread;
void (*mbedtls_mutex_free)(mbedtls_threading_mutex_t *) = threading_mutex_free_pthread;
int (*mbedtls_mutex_lock)(mbedtls_threading_mutex_t *) = threading_mutex_lock_pthread;
int (*mbedtls_mutex_unlock)(mbedtls_threading_mutex_t *) = threading_mutex_unlock_pthread;
/*
* With pthreads we can statically initialize mutexes
*/
#define MUTEX_INIT = { PTHREAD_MUTEX_INITIALIZER, 1 }
#endif /* MBEDTLS_THREADING_PTHREAD */
#if defined(MBEDTLS_THREADING_ALT)
static int threading_mutex_fail(mbedtls_threading_mutex_t *mutex)
{
((void) mutex);
return MBEDTLS_ERR_THREADING_BAD_INPUT_DATA;
}
static void threading_mutex_dummy(mbedtls_threading_mutex_t *mutex)
{
((void) mutex);
return;
}
void (*mbedtls_mutex_init)(mbedtls_threading_mutex_t *) = threading_mutex_dummy;
void (*mbedtls_mutex_free)(mbedtls_threading_mutex_t *) = threading_mutex_dummy;
int (*mbedtls_mutex_lock)(mbedtls_threading_mutex_t *) = threading_mutex_fail;
int (*mbedtls_mutex_unlock)(mbedtls_threading_mutex_t *) = threading_mutex_fail;
/*
* Set functions pointers and initialize global mutexes
*/
void mbedtls_threading_set_alt(void (*mutex_init)(mbedtls_threading_mutex_t *),
void (*mutex_free)(mbedtls_threading_mutex_t *),
int (*mutex_lock)(mbedtls_threading_mutex_t *),
int (*mutex_unlock)(mbedtls_threading_mutex_t *))
{
mbedtls_mutex_init = mutex_init;
mbedtls_mutex_free = mutex_free;
mbedtls_mutex_lock = mutex_lock;
mbedtls_mutex_unlock = mutex_unlock;
#if defined(MBEDTLS_FS_IO)
mbedtls_mutex_init(&mbedtls_threading_readdir_mutex);
#endif
#if defined(THREADING_USE_GMTIME)
mbedtls_mutex_init(&mbedtls_threading_gmtime_mutex);
#endif
#if defined(MBEDTLS_PSA_CRYPTO_C)
mbedtls_mutex_init(&mbedtls_threading_key_slot_mutex);
mbedtls_mutex_init(&mbedtls_threading_psa_globaldata_mutex);
mbedtls_mutex_init(&mbedtls_threading_psa_rngdata_mutex);
#endif
}
/*
* Free global mutexes
*/
void mbedtls_threading_free_alt(void)
{
#if defined(MBEDTLS_FS_IO)
mbedtls_mutex_free(&mbedtls_threading_readdir_mutex);
#endif
#if defined(THREADING_USE_GMTIME)
mbedtls_mutex_free(&mbedtls_threading_gmtime_mutex);
#endif
#if defined(MBEDTLS_PSA_CRYPTO_C)
mbedtls_mutex_free(&mbedtls_threading_key_slot_mutex);
mbedtls_mutex_free(&mbedtls_threading_psa_globaldata_mutex);
mbedtls_mutex_free(&mbedtls_threading_psa_rngdata_mutex);
#endif
}
#endif /* MBEDTLS_THREADING_ALT */
/*
* Define global mutexes
*/
#ifndef MUTEX_INIT
#define MUTEX_INIT
#endif
#if defined(MBEDTLS_FS_IO)
mbedtls_threading_mutex_t mbedtls_threading_readdir_mutex MUTEX_INIT;
#endif
#if defined(THREADING_USE_GMTIME)
mbedtls_threading_mutex_t mbedtls_threading_gmtime_mutex MUTEX_INIT;
#endif
#if defined(MBEDTLS_PSA_CRYPTO_C)
mbedtls_threading_mutex_t mbedtls_threading_key_slot_mutex MUTEX_INIT;
mbedtls_threading_mutex_t mbedtls_threading_psa_globaldata_mutex MUTEX_INIT;
mbedtls_threading_mutex_t mbedtls_threading_psa_rngdata_mutex MUTEX_INIT;
#endif
#endif /* MBEDTLS_THREADING_C */
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