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Diffstat (limited to 'src/ssl/test/malloc.cc')
-rw-r--r-- | src/ssl/test/malloc.cc | 130 |
1 files changed, 130 insertions, 0 deletions
diff --git a/src/ssl/test/malloc.cc b/src/ssl/test/malloc.cc new file mode 100644 index 0000000..6cc0b33 --- /dev/null +++ b/src/ssl/test/malloc.cc @@ -0,0 +1,130 @@ +/* Copyright (c) 2014, 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 <openssl/base.h> + +// This file isn't built on ARM or Aarch64 because we link statically in those +// builds and trying to override malloc in a static link doesn't work. +#if defined(__linux__) && !defined(OPENSSL_ARM) && !defined(OPENSSL_AARCH64) + +#include <stdint.h> +#include <stdlib.h> +#include <unistd.h> +#include <unistd.h> +#include <stdio.h> + +#include <new> + + +/* This file defines overrides for the standard allocation functions that allow + * a given allocation to be made to fail for testing. If the program is run + * with MALLOC_NUMBER_TO_FAIL set to a base-10 number then that allocation will + * return NULL. If MALLOC_ABORT_ON_FAIL is also defined then the allocation + * will abort() rather than return NULL. + * + * This code is not thread safe. */ + +static uint64_t current_malloc_count = 0; +static uint64_t malloc_number_to_fail = 0; +static char failure_enabled = 0, abort_on_fail = 0; +static int in_call = 0; + +extern "C" { +/* These are other names for the standard allocation functions. */ +extern void *__libc_malloc(size_t size); +extern void *__libc_calloc(size_t num_elems, size_t size); +extern void *__libc_realloc(void *ptr, size_t size); +} + +static void exit_handler(void) { + if (failure_enabled && current_malloc_count > malloc_number_to_fail) { + _exit(88); + } +} + +static void cpp_new_handler() { + // Return to try again. It won't fail a second time. + return; +} + +/* should_fail_allocation returns true if the current allocation should fail. */ +static int should_fail_allocation() { + static int init = 0; + char should_fail; + + if (in_call) { + return 0; + } + + in_call = 1; + + if (!init) { + const char *env = getenv("MALLOC_NUMBER_TO_FAIL"); + if (env != NULL && env[0] != 0) { + char *endptr; + malloc_number_to_fail = strtoull(env, &endptr, 10); + if (*endptr == 0) { + failure_enabled = 1; + atexit(exit_handler); + std::set_new_handler(cpp_new_handler); + } + } + abort_on_fail = (NULL != getenv("MALLOC_ABORT_ON_FAIL")); + init = 1; + } + + in_call = 0; + + if (!failure_enabled) { + return 0; + } + + should_fail = (current_malloc_count == malloc_number_to_fail); + current_malloc_count++; + + if (should_fail && abort_on_fail) { + abort(); + } + return should_fail; +} + +extern "C" { + +void *malloc(size_t size) { + if (should_fail_allocation()) { + return NULL; + } + + return __libc_malloc(size); +} + +void *calloc(size_t num_elems, size_t size) { + if (should_fail_allocation()) { + return NULL; + } + + return __libc_calloc(num_elems, size); +} + +void *realloc(void *ptr, size_t size) { + if (should_fail_allocation()) { + return NULL; + } + + return __libc_realloc(ptr, size); +} + +} // extern "C" + +#endif /* defined(linux) && !ARM && !AARCH64 */ |