82639e6f53
Previously we used thread-local state objects in rand.c. However, for applications with large numbers of threads, this can lead to excessive memory usage. This change causes us to maintain a mutex-protected pool of state objects where the size of the pool equals the maximum concurrency of |RAND_bytes|. This might lead to state objects bouncing between CPUs more often, but should help the memory usage problem. Change-Id: Ie83763d3bc139e64ac17bf7e015ad082b2f8a81a Reviewed-on: https://boringssl-review.googlesource.com/29565 Commit-Queue: Adam Langley <agl@google.com> CQ-Verified: CQ bot account: commit-bot@chromium.org <commit-bot@chromium.org> Reviewed-by: David Benjamin <davidben@google.com>
89 lines
4.3 KiB
C
89 lines
4.3 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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#ifndef OPENSSL_HEADER_FIPSMODULE_DELOCATE_H
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#define OPENSSL_HEADER_FIPSMODULE_DELOCATE_H
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#include <openssl/base.h>
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#include "../internal.h"
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#if defined(BORINGSSL_FIPS) && !defined(OPENSSL_ASAN) && !defined(OPENSSL_MSAN)
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#define DEFINE_BSS_GET(type, name) \
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static type name __attribute__((used)); \
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type *name##_bss_get(void) __attribute__((const));
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// For FIPS builds we require that CRYPTO_ONCE_INIT be zero.
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#define DEFINE_STATIC_ONCE(name) DEFINE_BSS_GET(CRYPTO_once_t, name)
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// For FIPS builds we require that CRYPTO_STATIC_MUTEX_INIT be zero.
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#define DEFINE_STATIC_MUTEX(name) \
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DEFINE_BSS_GET(struct CRYPTO_STATIC_MUTEX, name)
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// For FIPS builds we require that CRYPTO_EX_DATA_CLASS_INIT be zero.
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#define DEFINE_STATIC_EX_DATA_CLASS(name) \
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DEFINE_BSS_GET(CRYPTO_EX_DATA_CLASS, name)
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#else
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#define DEFINE_BSS_GET(type, name) \
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static type name; \
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static type *name##_bss_get(void) { return &name; }
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#define DEFINE_STATIC_ONCE(name) \
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static CRYPTO_once_t name = CRYPTO_ONCE_INIT; \
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static CRYPTO_once_t *name##_bss_get(void) { return &name; }
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#define DEFINE_STATIC_MUTEX(name) \
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static struct CRYPTO_STATIC_MUTEX name = CRYPTO_STATIC_MUTEX_INIT; \
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static struct CRYPTO_STATIC_MUTEX *name##_bss_get(void) { return &name; }
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#define DEFINE_STATIC_EX_DATA_CLASS(name) \
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static CRYPTO_EX_DATA_CLASS name = CRYPTO_EX_DATA_CLASS_INIT; \
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static CRYPTO_EX_DATA_CLASS *name##_bss_get(void) { return &name; }
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#endif
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#define DEFINE_DATA(type, name, accessor_decorations) \
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DEFINE_BSS_GET(type, name##_storage) \
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DEFINE_STATIC_ONCE(name##_once) \
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static void name##_do_init(type *out); \
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static void name##_init(void) { name##_do_init(name##_storage_bss_get()); } \
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accessor_decorations type *name(void) { \
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CRYPTO_once(name##_once_bss_get(), name##_init); \
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/* See http://c-faq.com/ansi/constmismatch.html for why the following \
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* cast is needed. */ \
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return (const type *)name##_storage_bss_get(); \
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} \
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static void name##_do_init(type *out)
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// DEFINE_METHOD_FUNCTION defines a function named |name| which returns a
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// method table of type const |type|*. In FIPS mode, to avoid rel.ro data, it
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// is split into a CRYPTO_once_t-guarded initializer in the module and
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// unhashed, non-module accessor functions to space reserved in the BSS. The
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// method table is initialized by a caller-supplied function which takes a
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// parameter named |out| of type |type|*. The caller should follow the macro
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// invocation with the body of this function:
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//
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// DEFINE_METHOD_FUNCTION(EVP_MD, EVP_md4) {
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// out->type = NID_md4;
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// out->md_size = MD4_DIGEST_LENGTH;
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// out->flags = 0;
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// out->init = md4_init;
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// out->update = md4_update;
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// out->final = md4_final;
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// out->block_size = 64;
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// out->ctx_size = sizeof(MD4_CTX);
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// }
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//
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// This mechanism does not use a static initializer because their execution
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// order is undefined. See FIPS.md for more details.
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#define DEFINE_METHOD_FUNCTION(type, name) DEFINE_DATA(type, name, const)
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#define DEFINE_LOCAL_DATA(type, name) DEFINE_DATA(type, name, static const)
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#endif // OPENSSL_HEADER_FIPSMODULE_DELOCATE_H
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