boringssl/crypto/thread_none.c
David Benjamin 5b33effa72 Rename OPENSSL_NO_THREADS, part 1.
BoringSSL depends on the platform's locking APIs to make internal global
state thread-safe, including the PRNG. On some single-threaded embedded
platforms, locking APIs may not exist, so this dependency may be disabled
with a build flag.

Doing so means the consumer promises the library will never be used in any
multi-threaded address space. It causes BoringSSL to be globally thread-unsafe.
Setting it inappropriately will subtly and unpredictably corrupt memory and
leak secret keys.

Unfortunately, folks sometimes misinterpreted OPENSSL_NO_THREADS as skipping an
internal thread pool or disabling an optionally extra-thread-safe mode. This is
not and has never been the case. Rename it to
OPENSSL_NO_THREADS_CORRUPT_MEMORY_AND_LEAK_SECRETS_IF_THREADED to clarify what
this option does.

Update-Note: As a first step, this CL makes both OPENSSL_NO_THREADS and
OPENSSL_NO_THREADS_CORRUPT_MEMORY_AND_LEAK_SECRETS_IF_THREADED work. A later CL
will remove the old name, so migrate callers after or at the same time as
picking up this CL.

Change-Id: Ibe4964ae43eb7a52f08fd966fccb330c0cc11a8c
Reviewed-on: https://boringssl-review.googlesource.com/32084
Commit-Queue: David Benjamin <davidben@google.com>
CQ-Verified: CQ bot account: commit-bot@chromium.org <commit-bot@chromium.org>
Reviewed-by: Adam Langley <agl@google.com>
2018-09-26 19:10:02 +00:00

60 lines
1.9 KiB
C

/* 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_THREADS)
void CRYPTO_MUTEX_init(CRYPTO_MUTEX *lock) {}
void CRYPTO_MUTEX_lock_read(CRYPTO_MUTEX *lock) {}
void CRYPTO_MUTEX_lock_write(CRYPTO_MUTEX *lock) {}
void CRYPTO_MUTEX_unlock_read(CRYPTO_MUTEX *lock) {}
void CRYPTO_MUTEX_unlock_write(CRYPTO_MUTEX *lock) {}
void CRYPTO_MUTEX_cleanup(CRYPTO_MUTEX *lock) {}
void CRYPTO_STATIC_MUTEX_lock_read(struct CRYPTO_STATIC_MUTEX *lock) {}
void CRYPTO_STATIC_MUTEX_lock_write(struct CRYPTO_STATIC_MUTEX *lock) {}
void CRYPTO_STATIC_MUTEX_unlock_read(struct CRYPTO_STATIC_MUTEX *lock) {}
void CRYPTO_STATIC_MUTEX_unlock_write(struct CRYPTO_STATIC_MUTEX *lock) {}
void CRYPTO_once(CRYPTO_once_t *once, void (*init)(void)) {
if (*once) {
return;
}
*once = 1;
init();
}
static void *g_thread_locals[NUM_OPENSSL_THREAD_LOCALS];
void *CRYPTO_get_thread_local(thread_local_data_t index) {
return g_thread_locals[index];
}
int CRYPTO_set_thread_local(thread_local_data_t index, void *value,
thread_local_destructor_t destructor) {
g_thread_locals[index] = value;
return 1;
}
#endif // !OPENSSL_THREADS