2b2b0f909d
Per malloc(3):
The UNIX 98 standard requires malloc(), calloc(), and realloc() to set
errno to ENOMEM upon failure. Glibc assumes that this is done (and the
glibc versions of these routines do this); if you use a private malloc
implementation that does not set errno, then certain library routines may
fail without having a reason in errno.
Notably, thread_test otherwise fails an assertion deep in glibc.
Change-Id: Ia2c0ab306987476e7d6570d4bbf04a2641398925
Reviewed-on: https://boringssl-review.googlesource.com/5111
Reviewed-by: Adam Langley <agl@google.com>
150 lines
4.0 KiB
C++
150 lines
4.0 KiB
C++
/* Copyright (c) 2014, 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/base.h>
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#if defined(__has_feature)
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#if __has_feature(address_sanitizer) || __has_feature(memory_sanitizer)
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#define OPENSSL_ASAN
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#endif
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#endif
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#if defined(__GLIBC__) && !defined(__UCLIBC__)
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#define OPENSSL_GLIBC
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#endif
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// This file isn't built on ARM or Aarch64 because we link statically in those
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// builds and trying to override malloc in a static link doesn't work. It also
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// requires glibc. It's also disabled on ASan builds as this interferes with
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// ASan's malloc interceptor.
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//
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// TODO(davidben): See if this and ASan's and MSan's interceptors can be made to
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// coexist.
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#if defined(__linux__) && defined(OPENSSL_GLIBC) && !defined(OPENSSL_ARM) && \
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!defined(OPENSSL_AARCH64) && !defined(OPENSSL_ASAN)
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#include <errno.h>
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#include <stdint.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <new>
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/* This file defines overrides for the standard allocation functions that allow
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* a given allocation to be made to fail for testing. If the program is run
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* with MALLOC_NUMBER_TO_FAIL set to a base-10 number then that allocation will
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* return NULL. If MALLOC_ABORT_ON_FAIL is also defined then the allocation
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* will abort() rather than return NULL.
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*
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* This code is not thread safe. */
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static uint64_t current_malloc_count = 0;
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static uint64_t malloc_number_to_fail = 0;
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static char failure_enabled = 0, abort_on_fail = 0;
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static int in_call = 0;
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extern "C" {
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/* These are other names for the standard allocation functions. */
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extern void *__libc_malloc(size_t size);
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extern void *__libc_calloc(size_t num_elems, size_t size);
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extern void *__libc_realloc(void *ptr, size_t size);
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}
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static void exit_handler(void) {
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if (failure_enabled && current_malloc_count > malloc_number_to_fail) {
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_exit(88);
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}
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}
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static void cpp_new_handler() {
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// Return to try again. It won't fail a second time.
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return;
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}
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/* should_fail_allocation returns true if the current allocation should fail. */
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static int should_fail_allocation() {
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static int init = 0;
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char should_fail;
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if (in_call) {
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return 0;
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}
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in_call = 1;
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if (!init) {
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const char *env = getenv("MALLOC_NUMBER_TO_FAIL");
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if (env != NULL && env[0] != 0) {
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char *endptr;
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malloc_number_to_fail = strtoull(env, &endptr, 10);
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if (*endptr == 0) {
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failure_enabled = 1;
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atexit(exit_handler);
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std::set_new_handler(cpp_new_handler);
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}
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}
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abort_on_fail = (NULL != getenv("MALLOC_ABORT_ON_FAIL"));
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init = 1;
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}
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in_call = 0;
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if (!failure_enabled) {
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return 0;
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}
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should_fail = (current_malloc_count == malloc_number_to_fail);
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current_malloc_count++;
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if (should_fail && abort_on_fail) {
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abort();
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}
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return should_fail;
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}
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extern "C" {
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void *malloc(size_t size) {
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if (should_fail_allocation()) {
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errno = ENOMEM;
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return NULL;
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}
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return __libc_malloc(size);
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}
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void *calloc(size_t num_elems, size_t size) {
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if (should_fail_allocation()) {
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errno = ENOMEM;
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return NULL;
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}
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return __libc_calloc(num_elems, size);
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}
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void *realloc(void *ptr, size_t size) {
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if (should_fail_allocation()) {
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errno = ENOMEM;
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return NULL;
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}
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return __libc_realloc(ptr, size);
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}
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} // extern "C"
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#endif /* defined(linux) && GLIBC && !ARM && !AARCH64 && !ASAN */
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