X-Git-Url: https://git.openssl.org/gitweb/?p=openssl.git;a=blobdiff_plain;f=crypto%2Fmem.c;h=16558ac78ca504326daea5d22b815d6e55003b47;hp=a4a78807f7a54c99188cb887aed1454c1853f438;hb=1f9e00a6fcd7138f399c6a968625cf0d2d61a438;hpb=a5435e8b2924eb45531e633b1cdc7e3dcad5b8ba

diff --git a/crypto/mem.c b/crypto/mem.c
index a4a78807f7..16558ac78c 100644
--- a/crypto/mem.c
+++ b/crypto/mem.c
@@ -1,346 +1,280 @@
-/* crypto/mem.c */
-/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
- * All rights reserved.
+/*
+ * Copyright 1995-2016 The OpenSSL Project Authors. 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.]
+ * 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 <stdio.h>
 #include <stdlib.h>
+#include <limits.h>
 #include <openssl/crypto.h>
-#include "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. */
+#include "internal/cryptlib.h"
+#include "internal/cryptlib_int.h"
+#ifndef OPENSSL_NO_CRYPTO_MDEBUG_BACKTRACE
+# include <execinfo.h>
+#endif
 
+/*
+ * the following pointers may be changed as long as 'allow_customize' is set
+ */
+static int allow_customize = 1;
 
+static void *(*malloc_impl)(size_t, const char *, int)
+    = CRYPTO_malloc;
+static void *(*realloc_impl)(void *, size_t, const char *, int)
+    = CRYPTO_realloc;
+static void (*free_impl)(void *, const char *, int)
+    = CRYPTO_free;
 
-/* the following pointers may be changed as long as 'allow_customize' is set */
+#ifndef OPENSSL_NO_CRYPTO_MDEBUG
+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 *(*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 parseit(void);
+static int shouldfail(void);
 
-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;
+# define FAILTEST() if (shouldfail()) return NULL
 
-static void (*free_func)(void *)            = free;
+#else
+static int call_malloc_debug = 0;
 
-static void *(*malloc_locked_func)(size_t)  = malloc;
-static void *default_malloc_locked_ex(size_t num, const char *file, int line)
-	{ return malloc_locked_func(num); }
-static void *(*malloc_locked_ex_func)(size_t, const char *file, int line)
-        = default_malloc_locked_ex;
+# define FAILTEST() /* empty */
+#endif
 
-static void (*free_locked_func)(void *)     = free;
+int CRYPTO_set_mem_functions(
+        void *(*m)(size_t, const char *, int),
+        void *(*r)(void *, size_t, const char *, int),
+        void (*f)(void *, const char *, int))
+{
+    if (!allow_customize)
+        return 0;
+    if (m)
+        malloc_impl = m;
+    if (r)
+        realloc_impl = r;
+    if (f)
+        free_impl = f;
+    return 1;
+}
+
+int CRYPTO_set_mem_debug(int flag)
+{
+    if (!allow_customize)
+        return 0;
+    call_malloc_debug = flag;
+    return 1;
+}
+
+void CRYPTO_get_mem_functions(
+        void *(**m)(size_t, const char *, int),
+        void *(**r)(void *, size_t, const char *, int),
+        void (**f)(void *, const char *, int))
+{
+    if (m != NULL)
+        *m = malloc_impl;
+    if (r != NULL)
+        *r = realloc_impl;
+    if (f != NULL)
+        *f = free_impl;
+}
+
+#ifndef OPENSSL_NO_CRYPTO_MDEBUG
+/*
+ * 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);
 
-/* 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 *,int,const char *,int,int)
-	= CRYPTO_dbg_malloc;
-static void (*realloc_debug_func)(void *,void *,int,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 *,int,const char *,int,int) = NULL;
-static void (*realloc_debug_func)(void *,void *,int,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
+    if (semi != NULL)
+        md_failstring = semi;
+}
 
-
-int CRYPTO_set_mem_functions(void *(*m)(size_t), void *(*r)(void *, size_t),
-	void (*f)(void *))
-	{
-	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;
-	malloc_locked_func=m; malloc_locked_ex_func=default_malloc_locked_ex;
-	free_locked_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_locked_func=0; malloc_locked_ex_func=m;
-	free_locked_func=f;
-	return 1;
-	}
-
-int CRYPTO_set_locked_mem_functions(void *(*m)(size_t), void (*f)(void *))
-	{
-	if (!allow_customize)
-		return 0;
-	if ((m == NULL) || (f == NULL))
-		return 0;
-	malloc_locked_func=m; malloc_locked_ex_func=default_malloc_locked_ex;
-	free_locked_func=f;
-	return 1;
-	}
-
-int CRYPTO_set_locked_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_locked_func=0; malloc_locked_ex_func=m;
-	free_func=f;
-	return 1;
-	}
-
-int CRYPTO_set_mem_debug_functions(void (*m)(void *,int,const char *,int,int),
-				   void (*r)(void *,void *,int,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_func;
-	if (r != NULL) *r=realloc_func;
-	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_locked_mem_functions(void *(**m)(size_t), void (**f)(void *))
-	{
-	if (m != NULL) *m=malloc_locked_func;
-	if (f != NULL) *f=free_locked_func;
-	}
-
-void CRYPTO_get_locked_mem_ex_functions(
-        void *(**m)(size_t,const char *,int),
-        void (**f)(void *))
-	{
-	if (m != NULL) *m = (malloc_locked_ex_func != default_malloc_locked_ex) ?
-	                    malloc_locked_ex_func : 0;
-	if (f != NULL) *f=free_locked_func;
-	}
-
-void CRYPTO_get_mem_debug_functions(void (**m)(void *,int,const char *,int,int),
-				    void (**r)(void *,void *,int,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_locked(int num, const char *file, int line)
-	{
-	void *ret = NULL;
-
-	allow_customize = 0;
-	if (malloc_debug_func != NULL)
-		{
-		allow_customize_debug = 0;
-		malloc_debug_func(NULL, num, file, line, 0);
-		}
-	ret = malloc_locked_ex_func(num,file,line);
-#ifdef LEVITTE_DEBUG_MEM
-	fprintf(stderr, "LEVITTE_DEBUG_MEM:         > 0x%p (%d)\n", ret, num);
-#endif
-	if (malloc_debug_func != NULL)
-		malloc_debug_func(ret, num, file, line, 1);
-
-	return ret;
-	}
-
-void CRYPTO_free_locked(void *str)
-	{
-	if (free_debug_func != NULL)
-		free_debug_func(str, 0);
-#ifdef LEVITTE_DEBUG_MEM
-	fprintf(stderr, "LEVITTE_DEBUG_MEM:         < 0x%p\n", str);
+/*
+ * See if the current malloc should fail.
+ */
+static int shouldfail(void)
+{
+    int roll = (int)(random() % 100);
+    int shouldfail = roll < md_fail_percent;
+    char buff[80];
+
+    if (md_tracefd > 0) {
+        BIO_snprintf(buff, sizeof(buff),
+                     "%c C%ld %%%d R%d\n",
+                     shouldfail ? '-' : '+', md_count, md_fail_percent, roll);
+        write(md_tracefd, buff, strlen(buff));
+#ifndef OPENSSL_NO_CRYPTO_MDEBUG_BACKTRACE
+        if (shouldfail) {
+            void *addrs[30];
+            int num = backtrace(addrs, OSSL_NELEM(addrs));
+
+            backtrace_symbols_fd(addrs, num, md_tracefd);
+        }
 #endif
-	free_locked_func(str);
-	if (free_debug_func != NULL)
-		free_debug_func(NULL, 1);
-	}
-
-void *CRYPTO_malloc(int num, const char *file, int line)
-	{
-	void *ret = NULL;
-
-	allow_customize = 0;
-	if (malloc_debug_func != NULL)
-		{
-		allow_customize_debug = 0;
-		malloc_debug_func(NULL, num, file, line, 0);
-		}
-	ret = malloc_ex_func(num,file,line);
-#ifdef LEVITTE_DEBUG_MEM
-	fprintf(stderr, "LEVITTE_DEBUG_MEM:         > 0x%p (%d)\n", ret, num);
+    }
+
+    if (md_count) {
+        /* If we used up this one, go to the next. */
+        if (--md_count == 0)
+            parseit();
+    }
+
+    return shouldfail;
+}
+
+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
-	if (malloc_debug_func != NULL)
-		malloc_debug_func(ret, num, file, line, 1);
-
-	return ret;
-	}
 
-void *CRYPTO_realloc(void *str, int num, const char *file, int line)
-	{
-	void *ret = NULL;
+void *CRYPTO_malloc(size_t num, const char *file, int line)
+{
+    void *ret = NULL;
+
+    if (malloc_impl != NULL && malloc_impl != CRYPTO_malloc)
+        return malloc_impl(num, file, line);
+
+    if (num <= 0)
+        return NULL;
+
+    FAILTEST();
+    allow_customize = 0;
+#ifndef OPENSSL_NO_CRYPTO_MDEBUG
+    if (call_malloc_debug) {
+        CRYPTO_mem_debug_malloc(NULL, num, 0, file, line);
+        ret = malloc(num);
+        CRYPTO_mem_debug_malloc(ret, num, 1, file, line);
+    } else {
+        ret = malloc(num);
+    }
+#else
+    osslargused(file); osslargused(line);
+    ret = malloc(num);
+#endif
 
-	if (realloc_debug_func != NULL)
-		realloc_debug_func(str, NULL, num, file, line, 0);
-	ret = realloc_ex_func(str,num,file,line);
-#ifdef LEVITTE_DEBUG_MEM
-	fprintf(stderr, "LEVITTE_DEBUG_MEM:         | 0x%p -> 0x%p (%d)\n", str, ret, num);
+    return ret;
+}
+
+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;
+}
+
+void *CRYPTO_realloc(void *str, size_t num, const char *file, int line)
+{
+    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);
+
+    if (num == 0) {
+        CRYPTO_free(str, file, line);
+        return NULL;
+    }
+
+    allow_customize = 0;
+#ifndef OPENSSL_NO_CRYPTO_MDEBUG
+    if (call_malloc_debug) {
+        void *ret;
+        CRYPTO_mem_debug_realloc(str, NULL, num, 0, file, line);
+        ret = realloc(str, num);
+        CRYPTO_mem_debug_realloc(str, ret, num, 1, file, line);
+        return ret;
+    }
+#else
+    osslargused(file); osslargused(line);
 #endif
-	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);
-#ifdef LEVITTE_DEBUG_MEM
-	fprintf(stderr, "LEVITTE_DEBUG_MEM:         < 0x%p\n", str);
+    return realloc(str, num);
+
+}
+
+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) {
+        CRYPTO_clear_free(str, old_len, file, line);
+        return NULL;
+    }
+
+    /* Can't shrink the buffer since memcpy below copies |old_len| bytes. */
+    if (num < old_len) {
+        OPENSSL_cleanse((char*)str + num, old_len - num);
+        return str;
+    }
+
+    ret = CRYPTO_malloc(num, file, line);
+    if (ret != NULL) {
+        memcpy(ret, str, old_len);
+        CRYPTO_clear_free(str, old_len, file, line);
+    }
+    return ret;
+}
+
+void CRYPTO_free(void *str, const char *file, int line)
+{
+    if (free_impl != NULL && free_impl != &CRYPTO_free) {
+        free_impl(str, file, line);
+        return;
+    }
+
+#ifndef OPENSSL_NO_CRYPTO_MDEBUG
+    if (call_malloc_debug) {
+        CRYPTO_mem_debug_free(str, 0, file, line);
+        free(str);
+        CRYPTO_mem_debug_free(str, 1, file, line);
+    } else {
+        free(str);
+    }
+#else
+    free(str);
 #endif
-	free_func(str);
-	if (free_debug_func != NULL)
-		free_debug_func(NULL, 1);
-	}
-
-void *CRYPTO_remalloc(void *a, int num, const char *file, int line)
-	{
-	if (a != NULL) OPENSSL_free(a);
-	a=(char *)OPENSSL_malloc(num);
-	return(a);
-	}
-
-
-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;
-	}
+}
+
+void CRYPTO_clear_free(void *str, size_t num, const char *file, int line)
+{
+    if (str == NULL)
+        return;
+    if (num)
+        OPENSSL_cleanse(str, num);
+    CRYPTO_free(str, file, line);
+}