256 lines
7.4 KiB
C
256 lines
7.4 KiB
C
/* crypto/mem.c */
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/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
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* All rights reserved.
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*
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* This package is an SSL implementation written
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* by Eric Young (eay@cryptsoft.com).
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* The implementation was written so as to conform with Netscapes SSL.
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*
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* This library is free for commercial and non-commercial use as long as
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* the following conditions are aheared to. The following conditions
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* apply to all code found in this distribution, be it the RC4, RSA,
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* lhash, DES, etc., code; not just the SSL code. The SSL documentation
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* included with this distribution is covered by the same copyright terms
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* except that the holder is Tim Hudson (tjh@cryptsoft.com).
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*
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* Copyright remains Eric Young's, and as such any Copyright notices in
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* the code are not to be removed.
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* If this package is used in a product, Eric Young should be given attribution
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* as the author of the parts of the library used.
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* This can be in the form of a textual message at program startup or
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* in documentation (online or textual) provided with the package.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* "This product includes cryptographic software written by
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* Eric Young (eay@cryptsoft.com)"
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* The word 'cryptographic' can be left out if the rouines from the library
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* being used are not cryptographic related :-).
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* 4. If you include any Windows specific code (or a derivative thereof) from
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* the apps directory (application code) you must include an acknowledgement:
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* "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
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*
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* THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* The licence and distribution terms for any publically available version or
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* derivative of this code cannot be changed. i.e. this code cannot simply be
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* copied and put under another distribution licence
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* [including the GNU Public Licence.]
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <limits.h>
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#include <openssl/crypto.h>
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#include "internal/cryptlib.h"
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/*
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* the following pointers may be changed as long as 'allow_customize' is set
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*/
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static int allow_customize = 1;
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static void *(*malloc_wrapper)(size_t, const char *, int)
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= CRYPTO_malloc;
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static void *(*realloc_wrapper)(void *, size_t, const char *, int)
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= CRYPTO_realloc;
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static void (*free_wrapper)(void *)
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= CRYPTO_free;
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#ifndef OPENSSL_NO_CRYPTO_MDEBUG
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static int call_malloc_debug = 1;
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#else
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static int call_malloc_debug = 0;
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#endif
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int CRYPTO_set_mem_functions(
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void *(*m)(size_t, const char *, int),
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void *(*r)(void *, size_t, const char *, int),
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void (*f)(void *))
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{
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if (!allow_customize)
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return 0;
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if (m)
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malloc_wrapper = m;
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if (r)
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realloc_wrapper = r;
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if (f)
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free_wrapper = f;
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return 1;
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}
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int CRYPTO_set_mem_debug(int flag)
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{
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if (!allow_customize)
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return 0;
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call_malloc_debug = flag;
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return 1;
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}
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void CRYPTO_get_mem_functions(
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void *(**m)(size_t, const char *, int),
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void *(**r)(void *, size_t, const char *, int),
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void (**f)(void *))
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{
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if (m != NULL)
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*m = malloc_wrapper;
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if (r != NULL)
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*r = realloc_wrapper;
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if (f != NULL)
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*f = free_wrapper;
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}
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void *CRYPTO_malloc(size_t num, const char *file, int line)
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{
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void *ret = NULL;
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if (num <= 0)
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return NULL;
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allow_customize = 0;
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#ifndef OPENSSL_NO_CRYPTO_MDEBUG
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if (call_malloc_debug) {
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CRYPTO_mem_debug_malloc(NULL, num, 0, file, line);
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ret = malloc(num);
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CRYPTO_mem_debug_malloc(ret, num, 1, file, line);
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} else {
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ret = malloc(num);
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}
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#else
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(void)file;
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(void)line;
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ret = malloc(num);
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#endif
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#ifndef OPENSSL_CPUID_OBJ
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/*
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* Create a dependency on the value of 'cleanse_ctr' so our memory
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* sanitisation function can't be optimised out. NB: We only do this for
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* >2Kb so the overhead doesn't bother us.
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*/
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if (ret && (num > 2048)) {
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extern unsigned char cleanse_ctr;
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((unsigned char *)ret)[0] = cleanse_ctr;
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}
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#endif
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return ret;
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}
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void *CRYPTO_zalloc(size_t num, const char *file, int line)
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{
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void *ret = CRYPTO_malloc(num, file, line);
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if (ret != NULL)
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memset(ret, 0, num);
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return ret;
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}
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void *CRYPTO_realloc(void *str, size_t num, const char *file, int line)
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{
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if (str == NULL)
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return CRYPTO_malloc(num, file, line);
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if (num == 0) {
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CRYPTO_free(str);
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return NULL;
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}
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allow_customize = 0;
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#ifndef OPENSSL_NO_CRYPTO_MDEBUG
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if (call_malloc_debug) {
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void *ret;
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CRYPTO_mem_debug_realloc(str, NULL, num, 0, file, line);
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ret = realloc(str, num);
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CRYPTO_mem_debug_realloc(str, ret, num, 1, file, line);
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return ret;
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}
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#else
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(void)file;
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(void)line;
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#endif
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return realloc(str, num);
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}
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void *CRYPTO_clear_realloc(void *str, size_t old_len, size_t num,
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const char *file, int line)
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{
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void *ret = NULL;
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if (str == NULL)
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return CRYPTO_malloc(num, file, line);
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if (num == 0) {
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CRYPTO_clear_free(str, old_len);
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return NULL;
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}
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/* Can't shrink the buffer since memcpy below copies |old_len| bytes. */
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if (num < old_len) {
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memset((char*)str + num, 0, old_len - num);
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return str;
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}
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/* Allocate new memory. Call malloc and do a copy, so that we can
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* cleanse the old buffer. */
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#ifndef OPENSSL_NO_CRYPTO_MDEBUG
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if (call_malloc_debug) {
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CRYPTO_mem_debug_realloc(str, NULL, num, 0, file, line);
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ret = malloc(num);
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CRYPTO_mem_debug_realloc(str, ret, num, 1, file, line);
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} else {
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ret = malloc(num);
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}
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#else
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(void)file;
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(void)line;
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ret = malloc(num);
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#endif
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if (ret)
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memcpy(ret, str, old_len);
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CRYPTO_clear_free(str, old_len);
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return ret;
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}
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void CRYPTO_free(void *str)
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{
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#ifndef OPENSSL_NO_CRYPTO_MDEBUG
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if (call_malloc_debug) {
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CRYPTO_mem_debug_free(str, 0);
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free(str);
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CRYPTO_mem_debug_free(str, 1);
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} else {
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free(str);
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}
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#else
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free(str);
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#endif
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}
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void CRYPTO_clear_free(void *str, size_t num)
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{
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if (str == NULL)
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return;
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if (num)
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OPENSSL_cleanse(str, num);
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CRYPTO_free(str);
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}
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