2 * Copyright 1995-2017 The OpenSSL Project Authors. All Rights Reserved.
4 * Licensed under the OpenSSL license (the "License"). You may not use
5 * this file except in compliance with the License. You can obtain a copy
6 * in the file LICENSE in the source distribution or at
7 * https://www.openssl.org/source/license.html
13 #include <openssl/crypto.h>
15 #include "internal/cryptlib.h"
16 #include "internal/cryptlib_int.h"
17 #ifndef OPENSSL_NO_CRYPTO_MDEBUG_BACKTRACE
18 # include <execinfo.h>
22 * the following pointers may be changed as long as 'allow_customize' is set
24 static int allow_customize = 1;
26 static void *(*malloc_impl)(size_t, const char *, int)
28 static void *(*realloc_impl)(void *, size_t, const char *, int)
30 static void (*free_impl)(void *, const char *, int)
33 #ifndef OPENSSL_NO_CRYPTO_MDEBUG
34 static char *md_failstring;
36 static int md_fail_percent = 0;
37 static int md_tracefd = -1;
38 static int call_malloc_debug = 1;
40 static void parseit(void);
41 static int shouldfail(void);
43 # define FAILTEST() if (shouldfail()) return NULL
46 static int call_malloc_debug = 0;
48 # define FAILTEST() /* empty */
51 int CRYPTO_set_mem_functions(
52 void *(*m)(size_t, const char *, int),
53 void *(*r)(void *, size_t, const char *, int),
54 void (*f)(void *, const char *, int))
67 int CRYPTO_set_mem_debug(int flag)
71 call_malloc_debug = flag;
75 void CRYPTO_get_mem_functions(
76 void *(**m)(size_t, const char *, int),
77 void *(**r)(void *, size_t, const char *, int),
78 void (**f)(void *, const char *, int))
88 #ifndef OPENSSL_NO_CRYPTO_MDEBUG
90 * Parse a "malloc failure spec" string. This likes like a set of fields
91 * separated by semicolons. Each field has a count and an optional failure
92 * percentage. For example:
95 * This means 100 mallocs succeed, then next 100 fail 25% of the time, and
96 * all remaining (count is zero) succeed.
98 static void parseit(void)
100 char *semi = strchr(md_failstring, ';');
106 /* Get the count (atol will stop at the @ if there), and percentage */
107 md_count = atol(md_failstring);
108 atsign = strchr(md_failstring, '@');
109 md_fail_percent = atsign == NULL ? 0 : atoi(atsign + 1);
112 md_failstring = semi;
116 * Windows doesn't have random(), but it has rand()
117 * Some rand() implementations aren't good, but we're not
118 * dealing with secure randomness here.
121 # define random() rand()
124 * See if the current malloc should fail.
126 static int shouldfail(void)
128 int roll = (int)(random() % 100);
129 int shoulditfail = roll < md_fail_percent;
133 if (md_tracefd > 0) {
134 BIO_snprintf(buff, sizeof(buff),
135 "%c C%ld %%%d R%d\n",
136 shoulditfail ? '-' : '+', md_count, md_fail_percent, roll);
138 if (write(md_tracefd, buff, len) != len)
139 perror("shouldfail write failed");
140 #ifndef OPENSSL_NO_CRYPTO_MDEBUG_BACKTRACE
143 int num = backtrace(addrs, OSSL_NELEM(addrs));
145 backtrace_symbols_fd(addrs, num, md_tracefd);
151 /* If we used up this one, go to the next. */
159 void ossl_malloc_setup_failures(void)
161 const char *cp = getenv("OPENSSL_MALLOC_FAILURES");
163 if (cp != NULL && (md_failstring = strdup(cp)) != NULL)
165 if ((cp = getenv("OPENSSL_MALLOC_FD")) != NULL)
166 md_tracefd = atoi(cp);
170 void *CRYPTO_malloc(size_t num, const char *file, int line)
174 if (malloc_impl != NULL && malloc_impl != CRYPTO_malloc)
175 return malloc_impl(num, file, line);
182 #ifndef OPENSSL_NO_CRYPTO_MDEBUG
183 if (call_malloc_debug) {
184 CRYPTO_mem_debug_malloc(NULL, num, 0, file, line);
186 CRYPTO_mem_debug_malloc(ret, num, 1, file, line);
191 (void)(file); (void)(line);
198 void *CRYPTO_zalloc(size_t num, const char *file, int line)
200 void *ret = CRYPTO_malloc(num, file, line);
208 void *CRYPTO_realloc(void *str, size_t num, const char *file, int line)
210 if (realloc_impl != NULL && realloc_impl != &CRYPTO_realloc)
211 return realloc_impl(str, num, file, line);
215 return CRYPTO_malloc(num, file, line);
218 CRYPTO_free(str, file, line);
223 #ifndef OPENSSL_NO_CRYPTO_MDEBUG
224 if (call_malloc_debug) {
226 CRYPTO_mem_debug_realloc(str, NULL, num, 0, file, line);
227 ret = realloc(str, num);
228 CRYPTO_mem_debug_realloc(str, ret, num, 1, file, line);
232 (void)(file); (void)(line);
234 return realloc(str, num);
238 void *CRYPTO_clear_realloc(void *str, size_t old_len, size_t num,
239 const char *file, int line)
244 return CRYPTO_malloc(num, file, line);
247 CRYPTO_clear_free(str, old_len, file, line);
251 /* Can't shrink the buffer since memcpy below copies |old_len| bytes. */
253 OPENSSL_cleanse((char*)str + num, old_len - num);
257 ret = CRYPTO_malloc(num, file, line);
259 memcpy(ret, str, old_len);
260 CRYPTO_clear_free(str, old_len, file, line);
265 void CRYPTO_free(void *str, const char *file, int line)
267 if (free_impl != NULL && free_impl != &CRYPTO_free) {
268 free_impl(str, file, line);
272 #ifndef OPENSSL_NO_CRYPTO_MDEBUG
273 if (call_malloc_debug) {
274 CRYPTO_mem_debug_free(str, 0, file, line);
276 CRYPTO_mem_debug_free(str, 1, file, line);
285 void CRYPTO_clear_free(void *str, size_t num, const char *file, int line)
290 OPENSSL_cleanse(str, num);
291 CRYPTO_free(str, file, line);