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849529257c
When the new OpenSSL CSPRNG was introduced in version 1.1.1,
it was announced in the release notes that it would be fork-safe,
which the old CSPRNG hadn't been.
The fork-safety was implemented using a fork count, which was
incremented by a pthread_atfork handler. Initially, this handler
was enabled by default. Unfortunately, the default behaviour
had to be changed for other reasons in commit b5319bdbd0, so
the new OpenSSL CSPRNG failed to keep its promise.
This commit restores the fork-safety using a different approach.
It replaces the fork count by a fork id, which coincides with
the process id on UNIX-like operating systems and is zero on other
operating systems. It is used to detect when an automatic reseed
after a fork is necessary.
To prevent a future regression, it also adds a test to verify that
the child reseeds after fork.
CVE-2019-1549
Reviewed-by: Paul Dale <paul.dale@oracle.com>
Reviewed-by: Matt Caswell <matt@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/9832)
150 lines
2.9 KiB
C
150 lines
2.9 KiB
C
/*
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* Copyright 2016-2018 The OpenSSL Project Authors. All Rights Reserved.
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*
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* Licensed under the Apache License 2.0 (the "License"). You may not use
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* this file except in compliance with the License. You can obtain a copy
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* in the file LICENSE in the source distribution or at
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* https://www.openssl.org/source/license.html
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*/
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#include <openssl/crypto.h>
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#include "internal/cryptlib.h"
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#if !defined(OPENSSL_THREADS) || defined(CRYPTO_TDEBUG)
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# if defined(OPENSSL_SYS_UNIX)
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# include <sys/types.h>
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# include <unistd.h>
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# endif
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CRYPTO_RWLOCK *CRYPTO_THREAD_lock_new(void)
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{
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CRYPTO_RWLOCK *lock;
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if ((lock = OPENSSL_zalloc(sizeof(unsigned int))) == NULL) {
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/* Don't set error, to avoid recursion blowup. */
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return NULL;
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}
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*(unsigned int *)lock = 1;
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return lock;
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}
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int CRYPTO_THREAD_read_lock(CRYPTO_RWLOCK *lock)
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{
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if (!ossl_assert(*(unsigned int *)lock == 1))
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return 0;
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return 1;
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}
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int CRYPTO_THREAD_write_lock(CRYPTO_RWLOCK *lock)
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{
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if (!ossl_assert(*(unsigned int *)lock == 1))
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return 0;
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return 1;
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}
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int CRYPTO_THREAD_unlock(CRYPTO_RWLOCK *lock)
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{
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if (!ossl_assert(*(unsigned int *)lock == 1))
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return 0;
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return 1;
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}
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void CRYPTO_THREAD_lock_free(CRYPTO_RWLOCK *lock) {
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if (lock == NULL)
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return;
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*(unsigned int *)lock = 0;
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OPENSSL_free(lock);
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return;
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}
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int CRYPTO_THREAD_run_once(CRYPTO_ONCE *once, void (*init)(void))
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{
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if (*once != 0)
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return 1;
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init();
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*once = 1;
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return 1;
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}
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#define OPENSSL_CRYPTO_THREAD_LOCAL_KEY_MAX 256
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static void *thread_local_storage[OPENSSL_CRYPTO_THREAD_LOCAL_KEY_MAX];
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int CRYPTO_THREAD_init_local(CRYPTO_THREAD_LOCAL *key, void (*cleanup)(void *))
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{
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static unsigned int thread_local_key = 0;
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if (thread_local_key >= OPENSSL_CRYPTO_THREAD_LOCAL_KEY_MAX)
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return 0;
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*key = thread_local_key++;
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thread_local_storage[*key] = NULL;
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return 1;
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}
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void *CRYPTO_THREAD_get_local(CRYPTO_THREAD_LOCAL *key)
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{
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if (*key >= OPENSSL_CRYPTO_THREAD_LOCAL_KEY_MAX)
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return NULL;
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return thread_local_storage[*key];
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}
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int CRYPTO_THREAD_set_local(CRYPTO_THREAD_LOCAL *key, void *val)
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{
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if (*key >= OPENSSL_CRYPTO_THREAD_LOCAL_KEY_MAX)
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return 0;
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thread_local_storage[*key] = val;
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return 1;
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}
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int CRYPTO_THREAD_cleanup_local(CRYPTO_THREAD_LOCAL *key)
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{
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*key = OPENSSL_CRYPTO_THREAD_LOCAL_KEY_MAX + 1;
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return 1;
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}
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CRYPTO_THREAD_ID CRYPTO_THREAD_get_current_id(void)
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{
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return 0;
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}
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int CRYPTO_THREAD_compare_id(CRYPTO_THREAD_ID a, CRYPTO_THREAD_ID b)
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{
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return (a == b);
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}
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int CRYPTO_atomic_add(int *val, int amount, int *ret, CRYPTO_RWLOCK *lock)
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{
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*val += amount;
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*ret = *val;
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return 1;
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}
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int openssl_init_fork_handlers(void)
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{
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return 0;
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}
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int openssl_get_fork_id(void)
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{
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# if defined(OPENSSL_SYS_UNIX)
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return getpid();
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# else
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return 0;
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# endif
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}
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#endif
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