A local copy of OpenSSL from GitHub
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/* crypto/mem.c */
/* 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.
*
* 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.]
*/
#include <stdio.h>
#include <stdlib.h>
#include <openssl/crypto.h>
#include "internal/cryptlib.h"
static int allow_customize = 1; /* we provide flexible functions for */
static int allow_customize_debug = 1; /* exchanging memory-related functions
* at run-time, but this must be done
* before any blocks are actually
* allocated; or we'll run into huge
* problems when malloc/free pairs
* don't match etc. */
/*
* the following pointers may be changed as long as 'allow_customize' is set
*/
static void *(*malloc_func) (size_t) = malloc;
static void *default_malloc_ex(size_t num, const char *file, int line)
{
return malloc_func(num);
}
static void *(*malloc_ex_func) (size_t, const char *file, int line)
= default_malloc_ex;
static void *(*realloc_func) (void *, size_t) = realloc;
static void *default_realloc_ex(void *str, size_t num,
const char *file, int line)
{
return realloc_func(str, num);
}
static void *(*realloc_ex_func) (void *, size_t, const char *file, int line)
= default_realloc_ex;
static void (*free_func) (void *) = free;
static void *(*malloc_secure_func)(size_t) = malloc;
static void *default_malloc_secure_ex(size_t num, const char *file, int line)
{
return malloc_secure_func(num);
}
static void *(*malloc_secure_ex_func)(size_t, const char *file, int line)
= default_malloc_secure_ex;
static void (*free_secure_func)(void *) = free;
/* may be changed as long as 'allow_customize_debug' is set */
/* XXX use correct function pointer types */
#ifdef CRYPTO_MDEBUG
/* use default functions from mem_dbg.c */
static void (*malloc_debug_func) (void *, size_t, const char *, int, int)
= CRYPTO_dbg_malloc;
static void (*realloc_debug_func) (void *, void *, size_t, const char *, int,
int)
= CRYPTO_dbg_realloc;
static void (*free_debug_func) (void *, int) = CRYPTO_dbg_free;
static void (*set_debug_options_func) (long) = CRYPTO_dbg_set_options;
static long (*get_debug_options_func) (void) = CRYPTO_dbg_get_options;
#else
/*
* applications can use CRYPTO_malloc_debug_init() to select above case at
* run-time
*/
static void (*malloc_debug_func) (void *, size_t, const char *, int, int) = NULL;
static void (*realloc_debug_func) (void *, void *, size_t, const char *, int,
int)
= NULL;
static void (*free_debug_func) (void *, int) = NULL;
static void (*set_debug_options_func) (long) = NULL;
static long (*get_debug_options_func) (void) = NULL;
#endif
int CRYPTO_set_mem_functions(void *(*m) (size_t), void *(*r) (void *, size_t),
void (*f) (void *))
{
/* Dummy call just to ensure OPENSSL_init() gets linked in */
OPENSSL_init();
if (!allow_customize)
return 0;
if ((m == 0) || (r == 0) || (f == 0))
return 0;
malloc_func = m;
malloc_ex_func = default_malloc_ex;
realloc_func = r;
realloc_ex_func = default_realloc_ex;
free_func = f;
/* If user wants to intercept the secure or locked functions, do it
* after the basic functions. */
malloc_secure_func = m;
malloc_secure_ex_func = default_malloc_secure_ex;
free_secure_func = f;
return 1;
}
int CRYPTO_set_mem_ex_functions(void *(*m) (size_t, const char *, int),
void *(*r) (void *, size_t, const char *,
int), void (*f) (void *))
{
if (!allow_customize)
return 0;
if ((m == 0) || (r == 0) || (f == 0))
return 0;
malloc_func = 0;
malloc_ex_func = m;
realloc_func = 0;
realloc_ex_func = r;
free_func = f;
malloc_secure_func = 0;
malloc_secure_ex_func = m;
free_secure_func = f;
return 1;
}
int CRYPTO_set_secure_mem_functions(void *(*m)(size_t), void (*f)(void *))
{
/* Dummy call just to ensure OPENSSL_init() gets linked in */
OPENSSL_init();
if (!allow_customize)
return 0;
if ((m == 0) || (f == 0))
return 0;
malloc_secure_func = m;
malloc_secure_ex_func = default_malloc_secure_ex;
free_secure_func = f;
return 1;
}
int CRYPTO_set_secure_mem_ex_functions(void *(*m)(size_t, const char *, int),
void (*f)(void *))
{
if (!allow_customize)
return 0;
if ((m == NULL) || (f == NULL))
return 0;
malloc_secure_func = 0;
malloc_secure_ex_func = m;
free_secure_func = f;
return 1;
}
int CRYPTO_set_mem_debug_functions(void (*m) (void *, size_t,
const char *, int, int),
void (*r) (void *, void *, size_t,
const char *, int, int),
void (*f) (void *, int), void (*so) (long),
long (*go) (void))
{
if (!allow_customize_debug)
return 0;
malloc_debug_func = m;
realloc_debug_func = r;
free_debug_func = f;
set_debug_options_func = so;
get_debug_options_func = go;
return 1;
}
void CRYPTO_get_mem_functions(void *(**m) (size_t),
void *(**r) (void *, size_t),
void (**f) (void *))
{
if (m != NULL)
*m = (malloc_ex_func == default_malloc_ex) ? malloc_func : 0;
if (r != NULL)
*r = (realloc_ex_func == default_realloc_ex) ? realloc_func : 0;
if (f != NULL)
*f = free_func;
}
void CRYPTO_get_mem_ex_functions(void *(**m) (size_t, const char *, int),
void *(**r) (void *, size_t, const char *,
int), void (**f) (void *))
{
if (m != NULL)
*m = (malloc_ex_func != default_malloc_ex) ? malloc_ex_func : 0;
if (r != NULL)
*r = (realloc_ex_func != default_realloc_ex) ? realloc_ex_func : 0;
if (f != NULL)
*f = free_func;
}
void CRYPTO_get_secure_mem_functions(void *(**m)(size_t), void (**f)(void *))
{
if (m != NULL)
*m = (malloc_secure_ex_func == default_malloc_secure_ex) ?
malloc_secure_func : 0;
if (f != NULL)
*f=free_secure_func;
}
void CRYPTO_get_secure_mem_ex_functions(void *(**m)(size_t,const char *,int),
void (**f)(void *))
{
if (m != NULL)
*m = (malloc_secure_ex_func != default_malloc_secure_ex) ?
malloc_secure_ex_func : 0;
if (f != NULL)
*f=free_secure_func;
}
void CRYPTO_get_mem_debug_functions(void (**m) (void *, size_t,
const char *, int, int),
void (**r) (void *, void *, size_t,
const char *, int, int),
void (**f) (void *, int),
void (**so) (long), long (**go) (void))
{
if (m != NULL)
*m = malloc_debug_func;
if (r != NULL)
*r = realloc_debug_func;
if (f != NULL)
*f = free_debug_func;
if (so != NULL)
*so = set_debug_options_func;
if (go != NULL)
*go = get_debug_options_func;
}
void *CRYPTO_malloc(size_t num, const char *file, int line)
{
void *ret = NULL;
if (num <= 0)
return NULL;
if (allow_customize)
allow_customize = 0;
if (malloc_debug_func != NULL) {
if (allow_customize_debug)
allow_customize_debug = 0;
malloc_debug_func(NULL, num, file, line, 0);
}
ret = malloc_ex_func(num, file, line);
if (malloc_debug_func != NULL)
malloc_debug_func(ret, num, file, line, 1);
#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;
}
void *CRYPTO_zalloc(size_t num, const char *file, int line)
{
void *ret = CRYPTO_malloc(num, file, line);
if (ret != NULL)
memset(ret, 0, num);
return ret;
}
void *CRYPTO_realloc(void *str, size_t num, const char *file, int line)
{
void *ret = NULL;
if (str == NULL)
return CRYPTO_malloc(num, file, line);
if (num <= 0)
return NULL;
if (realloc_debug_func != NULL)
realloc_debug_func(str, NULL, num, file, line, 0);
ret = realloc_ex_func(str, num, file, line);
if (realloc_debug_func != NULL)
realloc_debug_func(str, ret, num, file, line, 1);
return ret;
}
void *CRYPTO_clear_realloc(void *str, size_t old_len, size_t num,
const char *file, int line)
{
void *ret = NULL;
if (str == NULL)
return CRYPTO_malloc(num, file, line);
if (num <= 0)
return NULL;
/*
* We don't support shrinking the buffer. Note the memcpy that copies
* |old_len| bytes to the new buffer, below.
*/
if (num < old_len)
return NULL;
if (realloc_debug_func != NULL)
realloc_debug_func(str, NULL, num, file, line, 0);
ret = malloc_ex_func(num, file, line);
if (ret) {
memcpy(ret, str, old_len);
OPENSSL_clear_free(str, old_len);
}
if (realloc_debug_func != NULL)
realloc_debug_func(str, ret, num, file, line, 1);
return ret;
}
void CRYPTO_free(void *str)
{
if (free_debug_func != NULL)
free_debug_func(str, 0);
free_func(str);
if (free_debug_func != NULL)
free_debug_func(NULL, 1);
}
void CRYPTO_clear_free(void *str, size_t num)
{
if (!str)
return;
if (num)
OPENSSL_cleanse(str, num);
CRYPTO_free(str);
}
void CRYPTO_set_mem_debug_options(long bits)
{
if (set_debug_options_func != NULL)
set_debug_options_func(bits);
}
long CRYPTO_get_mem_debug_options(void)
{
if (get_debug_options_func != NULL)
return get_debug_options_func();
return 0;
}