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
11 #include "internal/cryptlib.h"
12 #include "internal/cryptlib_int.h"
16 #include <openssl/crypto.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 int malloc_count;
35 static int realloc_count;
36 static int free_count;
39 # define INCREMENT(x) CRYPTO_atomic_add(&x, 1, &dummy, memdbg_lock)
40 # define GET(ret, val) CRYPTO_atomic_read(&val, ret, memdbg_lock)
42 static char *md_failstring;
44 static int md_fail_percent = 0;
45 static int md_tracefd = -1;
46 static int call_malloc_debug = 1;
48 static void parseit(void);
49 static int shouldfail(void);
51 # define FAILTEST() if (shouldfail()) return NULL
54 static int call_malloc_debug = 0;
56 # define INCREMENT(x) /* empty */
57 # define FAILTEST() /* empty */
60 int CRYPTO_set_mem_functions(
61 void *(*m)(size_t, const char *, int),
62 void *(*r)(void *, size_t, const char *, int),
63 void (*f)(void *, const char *, int))
76 int CRYPTO_set_mem_debug(int flag)
80 call_malloc_debug = flag;
84 void CRYPTO_get_mem_functions(
85 void *(**m)(size_t, const char *, int),
86 void *(**r)(void *, size_t, const char *, int),
87 void (**f)(void *, const char *, int))
97 #ifndef OPENSSL_NO_CRYPTO_MDEBUG
98 void CRYPTO_get_alloc_counts(int *mcount, int *rcount, int *fcount)
101 GET(mcount, malloc_count);
103 GET(rcount, realloc_count);
105 GET(fcount, free_count);
109 * Parse a "malloc failure spec" string. This likes like a set of fields
110 * separated by semicolons. Each field has a count and an optional failure
111 * percentage. For example:
114 * This means 100 mallocs succeed, then next 100 fail 25% of the time, and
115 * all remaining (count is zero) succeed.
117 static void parseit(void)
119 char *semi = strchr(md_failstring, ';');
125 /* Get the count (atol will stop at the @ if there), and percentage */
126 md_count = atol(md_failstring);
127 atsign = strchr(md_failstring, '@');
128 md_fail_percent = atsign == NULL ? 0 : atoi(atsign + 1);
131 md_failstring = semi;
135 * Windows doesn't have random(), but it has rand()
136 * Some rand() implementations aren't good, but we're not
137 * dealing with secure randomness here.
140 # define random() rand()
143 * See if the current malloc should fail.
145 static int shouldfail(void)
147 int roll = (int)(random() % 100);
148 int shoulditfail = roll < md_fail_percent;
152 if (md_tracefd > 0) {
153 BIO_snprintf(buff, sizeof(buff),
154 "%c C%ld %%%d R%d\n",
155 shoulditfail ? '-' : '+', md_count, md_fail_percent, roll);
157 if (write(md_tracefd, buff, len) != len)
158 perror("shouldfail write failed");
159 #ifndef OPENSSL_NO_CRYPTO_MDEBUG_BACKTRACE
162 int num = backtrace(addrs, OSSL_NELEM(addrs));
164 backtrace_symbols_fd(addrs, num, md_tracefd);
170 /* If we used up this one, go to the next. */
178 void ossl_malloc_setup_failures(void)
180 const char *cp = getenv("OPENSSL_MALLOC_FAILURES");
182 if (cp != NULL && (md_failstring = strdup(cp)) != NULL)
184 if ((cp = getenv("OPENSSL_MALLOC_FD")) != NULL)
185 md_tracefd = atoi(cp);
189 void *CRYPTO_malloc(size_t num, const char *file, int line)
193 INCREMENT(malloc_count);
194 if (malloc_impl != NULL && malloc_impl != CRYPTO_malloc)
195 return malloc_impl(num, file, line);
202 #ifndef OPENSSL_NO_CRYPTO_MDEBUG
203 if (call_malloc_debug) {
204 CRYPTO_mem_debug_malloc(NULL, num, 0, file, line);
206 CRYPTO_mem_debug_malloc(ret, num, 1, file, line);
211 (void)(file); (void)(line);
218 void *CRYPTO_zalloc(size_t num, const char *file, int line)
220 void *ret = CRYPTO_malloc(num, file, line);
228 void *CRYPTO_realloc(void *str, size_t num, const char *file, int line)
230 INCREMENT(realloc_count);
231 if (realloc_impl != NULL && realloc_impl != &CRYPTO_realloc)
232 return realloc_impl(str, num, file, line);
236 return CRYPTO_malloc(num, file, line);
239 CRYPTO_free(str, file, line);
244 #ifndef OPENSSL_NO_CRYPTO_MDEBUG
245 if (call_malloc_debug) {
247 CRYPTO_mem_debug_realloc(str, NULL, num, 0, file, line);
248 ret = realloc(str, num);
249 CRYPTO_mem_debug_realloc(str, ret, num, 1, file, line);
253 (void)(file); (void)(line);
255 return realloc(str, num);
259 void *CRYPTO_clear_realloc(void *str, size_t old_len, size_t num,
260 const char *file, int line)
265 return CRYPTO_malloc(num, file, line);
268 CRYPTO_clear_free(str, old_len, file, line);
272 /* Can't shrink the buffer since memcpy below copies |old_len| bytes. */
274 OPENSSL_cleanse((char*)str + num, old_len - num);
278 ret = CRYPTO_malloc(num, file, line);
280 memcpy(ret, str, old_len);
281 CRYPTO_clear_free(str, old_len, file, line);
286 void CRYPTO_free(void *str, const char *file, int line)
288 INCREMENT(free_count);
289 if (free_impl != NULL && free_impl != &CRYPTO_free) {
290 free_impl(str, file, line);
294 #ifndef OPENSSL_NO_CRYPTO_MDEBUG
295 if (call_malloc_debug) {
296 CRYPTO_mem_debug_free(str, 0, file, line);
298 CRYPTO_mem_debug_free(str, 1, file, line);
307 void CRYPTO_clear_free(void *str, size_t num, const char *file, int line)
312 OPENSSL_cleanse(str, num);
313 CRYPTO_free(str, file, line);