X-Git-Url: https://git.openssl.org/gitweb/?p=openssl.git;a=blobdiff_plain;f=crypto%2Fmem.c;h=c77584cd5f6c809d65a0d564bfacda7c4cdfd634;hp=46f00176ab077a7bc9b8b460fa16bfd8ff16a59b;hb=9ee020f8dc7813db82a119058d8f57e70e7e8904;hpb=05c7b1631b4f6884b9ef5f0943a3d16d36383f52 diff --git a/crypto/mem.c b/crypto/mem.c index 46f00176ab..c77584cd5f 100644 --- a/crypto/mem.c +++ b/crypto/mem.c @@ -1,65 +1,22 @@ -/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) - * All rights reserved. - * - * This package is an SSL implementation written - * by Eric Young (eay@cryptsoft.com). - * The implementation was written so as to conform with Netscapes SSL. - * - * This library is free for commercial and non-commercial use as long as - * the following conditions are aheared to. The following conditions - * apply to all code found in this distribution, be it the RC4, RSA, - * lhash, DES, etc., code; not just the SSL code. The SSL documentation - * included with this distribution is covered by the same copyright terms - * except that the holder is Tim Hudson (tjh@cryptsoft.com). - * - * Copyright remains Eric Young's, and as such any Copyright notices in - * the code are not to be removed. - * If this package is used in a product, Eric Young should be given attribution - * as the author of the parts of the library used. - * This can be in the form of a textual message at program startup or - * in documentation (online or textual) provided with the package. - * - * Redistribution and use in source and binary forms, with or without - * modification, are permitted provided that the following conditions - * are met: - * 1. Redistributions of source code must retain the copyright - * notice, this list of conditions and the following disclaimer. - * 2. Redistributions in binary form must reproduce the above copyright - * notice, this list of conditions and the following disclaimer in the - * documentation and/or other materials provided with the distribution. - * 3. All advertising materials mentioning features or use of this software - * must display the following acknowledgement: - * "This product includes cryptographic software written by - * Eric Young (eay@cryptsoft.com)" - * The word 'cryptographic' can be left out if the rouines from the library - * being used are not cryptographic related :-). - * 4. If you include any Windows specific code (or a derivative thereof) from - * the apps directory (application code) you must include an acknowledgement: - * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" - * - * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND - * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE - * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE - * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE - * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL - * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS - * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) - * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT - * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY - * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF - * SUCH DAMAGE. +/* + * Copyright 1995-2017 The OpenSSL Project Authors. All Rights Reserved. * - * The licence and distribution terms for any publically available version or - * derivative of this code cannot be changed. i.e. this code cannot simply be - * copied and put under another distribution licence - * [including the GNU Public Licence.] + * Licensed under the OpenSSL license (the "License"). You may not use + * this file except in compliance with the License. You can obtain a copy + * in the file LICENSE in the source distribution or at + * https://www.openssl.org/source/license.html */ +#include "e_os.h" +#include "internal/cryptlib.h" +#include "internal/cryptlib_int.h" #include #include #include #include -#include "internal/cryptlib.h" +#ifndef OPENSSL_NO_CRYPTO_MDEBUG_BACKTRACE +# include +#endif /* * the following pointers may be changed as long as 'allow_customize' is set @@ -74,9 +31,30 @@ static void (*free_impl)(void *, const char *, int) = CRYPTO_free; #ifndef OPENSSL_NO_CRYPTO_MDEBUG +static int malloc_count; +static int realloc_count; +static int free_count; +static int dummy; + +# define INCREMENT(x) CRYPTO_atomic_add(&x, 1, &dummy, memdbg_lock) +# define GET(ret, val) CRYPTO_atomic_read(&val, ret, memdbg_lock) + +static char *md_failstring; +static long md_count; +static int md_fail_percent = 0; +static int md_tracefd = -1; static int call_malloc_debug = 1; + +static void parseit(void); +static int shouldfail(void); + +# define FAILTEST() if (shouldfail()) return NULL + #else static int call_malloc_debug = 0; + +# define INCREMENT(x) /* empty */ +# define FAILTEST() /* empty */ #endif int CRYPTO_set_mem_functions( @@ -116,16 +94,110 @@ void CRYPTO_get_mem_functions( *f = free_impl; } +#ifndef OPENSSL_NO_CRYPTO_MDEBUG +void CRYPTO_get_alloc_counts(int *mcount, int *rcount, int *fcount) +{ + if (mcount != NULL) + GET(mcount, malloc_count); + if (rcount != NULL) + GET(rcount, realloc_count); + if (fcount != NULL) + GET(fcount, free_count); +} + +/* + * Parse a "malloc failure spec" string. This likes like a set of fields + * separated by semicolons. Each field has a count and an optional failure + * percentage. For example: + * 100@0;100@25;0@0 + * or 100;100@25;0 + * This means 100 mallocs succeed, then next 100 fail 25% of the time, and + * all remaining (count is zero) succeed. + */ +static void parseit(void) +{ + char *semi = strchr(md_failstring, ';'); + char *atsign; + + if (semi != NULL) + *semi++ = '\0'; + + /* Get the count (atol will stop at the @ if there), and percentage */ + md_count = atol(md_failstring); + atsign = strchr(md_failstring, '@'); + md_fail_percent = atsign == NULL ? 0 : atoi(atsign + 1); + + if (semi != NULL) + md_failstring = semi; +} + +/* + * Windows doesn't have random(), but it has rand() + * Some rand() implementations aren't good, but we're not + * dealing with secure randomness here. + */ +#ifdef _WIN32 +# define random() rand() +#endif +/* + * See if the current malloc should fail. + */ +static int shouldfail(void) +{ + int roll = (int)(random() % 100); + int shoulditfail = roll < md_fail_percent; + int len; + char buff[80]; + + if (md_tracefd > 0) { + BIO_snprintf(buff, sizeof(buff), + "%c C%ld %%%d R%d\n", + shoulditfail ? '-' : '+', md_count, md_fail_percent, roll); + len = strlen(buff); + if (write(md_tracefd, buff, len) != len) + perror("shouldfail write failed"); +#ifndef OPENSSL_NO_CRYPTO_MDEBUG_BACKTRACE + if (shoulditfail) { + void *addrs[30]; + int num = backtrace(addrs, OSSL_NELEM(addrs)); + + backtrace_symbols_fd(addrs, num, md_tracefd); + } +#endif + } + + if (md_count) { + /* If we used up this one, go to the next. */ + if (--md_count == 0) + parseit(); + } + + return shoulditfail; +} + +void ossl_malloc_setup_failures(void) +{ + const char *cp = getenv("OPENSSL_MALLOC_FAILURES"); + + if (cp != NULL && (md_failstring = strdup(cp)) != NULL) + parseit(); + if ((cp = getenv("OPENSSL_MALLOC_FD")) != NULL) + md_tracefd = atoi(cp); +} +#endif + void *CRYPTO_malloc(size_t num, const char *file, int line) { void *ret = NULL; + INCREMENT(malloc_count); if (malloc_impl != NULL && malloc_impl != CRYPTO_malloc) return malloc_impl(num, file, line); - if (num <= 0) + if (num == 0) return NULL; + FAILTEST(); allow_customize = 0; #ifndef OPENSSL_NO_CRYPTO_MDEBUG if (call_malloc_debug) { @@ -136,23 +208,10 @@ void *CRYPTO_malloc(size_t num, const char *file, int line) ret = malloc(num); } #else - (void)file; - (void)line; + (void)(file); (void)(line); ret = malloc(num); #endif -#ifndef OPENSSL_CPUID_OBJ - /* - * Create a dependency on the value of 'cleanse_ctr' so our memory - * sanitisation function can't be optimised out. NB: We only do this for - * >2Kb so the overhead doesn't bother us. - */ - if (ret && (num > 2048)) { - extern unsigned char cleanse_ctr; - ((unsigned char *)ret)[0] = cleanse_ctr; - } -#endif - return ret; } @@ -160,6 +219,7 @@ void *CRYPTO_zalloc(size_t num, const char *file, int line) { void *ret = CRYPTO_malloc(num, file, line); + FAILTEST(); if (ret != NULL) memset(ret, 0, num); return ret; @@ -167,9 +227,11 @@ void *CRYPTO_zalloc(size_t num, const char *file, int line) void *CRYPTO_realloc(void *str, size_t num, const char *file, int line) { + INCREMENT(realloc_count); if (realloc_impl != NULL && realloc_impl != &CRYPTO_realloc) return realloc_impl(str, num, file, line); + FAILTEST(); if (str == NULL) return CRYPTO_malloc(num, file, line); @@ -188,8 +250,7 @@ void *CRYPTO_realloc(void *str, size_t num, const char *file, int line) return ret; } #else - (void)file; - (void)line; + (void)(file); (void)(line); #endif return realloc(str, num); @@ -210,20 +271,21 @@ void *CRYPTO_clear_realloc(void *str, size_t old_len, size_t num, /* Can't shrink the buffer since memcpy below copies |old_len| bytes. */ if (num < old_len) { - memset((char*)str + num, 0, old_len - num); + OPENSSL_cleanse((char*)str + num, old_len - num); return str; } ret = CRYPTO_malloc(num, file, line); - - if (ret) + if (ret != NULL) { memcpy(ret, str, old_len); - CRYPTO_clear_free(str, old_len, file, line); + CRYPTO_clear_free(str, old_len, file, line); + } return ret; } void CRYPTO_free(void *str, const char *file, int line) { + INCREMENT(free_count); if (free_impl != NULL && free_impl != &CRYPTO_free) { free_impl(str, file, line); return;