8e8f250422
We switched from thread-local storage to a mutex-pool in 82639e6f53
because, for highly-threaded processes, the memory used by all the
states could be quite large. I had judged that a mutex-pool should be
fine, but had underestimated the PRNG requirements of some of our jobs.
This change makes rand.c support using either thread-locals or a
mutex-pool. Thread-locals are used if fork-unsafe buffering is enabled.
While not strictly related to fork-safety, we already have the
fork-unsafe control, and it's already set by jobs that care a lot about
PRNG performance, so fits quite nicely here.
Change-Id: Iaf1e0171c70d4c8dbe1e42283ea13df5b613cb2d
Reviewed-on: https://boringssl-review.googlesource.com/c/31564
Commit-Queue: Adam Langley <agl@google.com>
Reviewed-by: David Benjamin <davidben@google.com>
51 lines
1.7 KiB
C
51 lines
1.7 KiB
C
/* Copyright (c) 2017, Google Inc.
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*
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* Permission to use, copy, modify, and/or distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
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* SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
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* OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
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* CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. */
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#include <openssl/rand.h>
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#include <stdlib.h>
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#include "../fipsmodule/rand/internal.h"
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// g_buffering_enabled is true if fork-unsafe buffering has been enabled.
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static int g_buffering_enabled = 0;
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static CRYPTO_once_t g_buffering_enabled_once = CRYPTO_ONCE_INIT;
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static int g_buffering_enabled_pending = 0;
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static void g_buffer_enabled_init(void) {
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g_buffering_enabled = g_buffering_enabled_pending;
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}
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#if !defined(OPENSSL_WINDOWS)
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void RAND_enable_fork_unsafe_buffering(int fd) {
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// We no longer support setting the file-descriptor with this function.
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if (fd != -1) {
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abort();
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}
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g_buffering_enabled_pending = 1;
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CRYPTO_once(&g_buffering_enabled_once, g_buffer_enabled_init);
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if (g_buffering_enabled != 1) {
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// RAND_bytes has been called before this function.
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abort();
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}
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}
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#endif
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int rand_fork_unsafe_buffering_enabled(void) {
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CRYPTO_once(&g_buffering_enabled_once, g_buffer_enabled_init);
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return g_buffering_enabled;
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}
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