2 * Copyright 1995-2018 The OpenSSL Project Authors. All Rights Reserved.
4 * Licensed under the Apache License 2.0 (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 "crypto/cryptlib.h"
16 #include <openssl/crypto.h>
19 * the following pointers may be changed as long as 'allow_customize' is set
21 static int allow_customize = 1;
22 static CRYPTO_malloc_fn malloc_impl = CRYPTO_malloc;
23 static CRYPTO_realloc_fn realloc_impl = CRYPTO_realloc;
24 static CRYPTO_free_fn free_impl = CRYPTO_free;
26 #if !defined(OPENSSL_NO_CRYPTO_MDEBUG) && !defined(FIPS_MODE)
27 # include "internal/tsan_assist.h"
29 static TSAN_QUALIFIER int malloc_count;
30 static TSAN_QUALIFIER int realloc_count;
31 static TSAN_QUALIFIER int free_count;
33 # define INCREMENT(x) tsan_counter(&(x))
35 static char *md_failstring;
37 static int md_fail_percent = 0;
38 static int md_tracefd = -1;
40 static void parseit(void);
41 static int shouldfail(void);
43 # define FAILTEST() if (shouldfail()) return NULL
47 # define INCREMENT(x) /* empty */
48 # define FAILTEST() /* empty */
51 int CRYPTO_set_mem_functions(CRYPTO_malloc_fn malloc_fn,
52 CRYPTO_realloc_fn realloc_fn,
53 CRYPTO_free_fn free_fn)
57 if (malloc_fn != NULL)
58 malloc_impl = malloc_fn;
59 if (realloc_fn != NULL)
60 realloc_impl = realloc_fn;
66 void CRYPTO_get_mem_functions(CRYPTO_malloc_fn *malloc_fn,
67 CRYPTO_realloc_fn *realloc_fn,
68 CRYPTO_free_fn *free_fn)
70 if (malloc_fn != NULL)
71 *malloc_fn = malloc_impl;
72 if (realloc_fn != NULL)
73 *realloc_fn = realloc_impl;
78 #if !defined(OPENSSL_NO_CRYPTO_MDEBUG) && !defined(FIPS_MODE)
79 void CRYPTO_get_alloc_counts(int *mcount, int *rcount, int *fcount)
82 *mcount = tsan_load(&malloc_count);
84 *rcount = tsan_load(&realloc_count);
86 *fcount = tsan_load(&free_count);
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;
131 /* suppressed on Windows as POSIX-like file descriptors are non-inheritable */
135 if (md_tracefd > 0) {
136 BIO_snprintf(buff, sizeof(buff),
137 "%c C%ld %%%d R%d\n",
138 shoulditfail ? '-' : '+', md_count, md_fail_percent, roll);
140 if (write(md_tracefd, buff, len) != len)
141 perror("shouldfail write failed");
146 /* If we used up this one, go to the next. */
154 void ossl_malloc_setup_failures(void)
156 const char *cp = getenv("OPENSSL_MALLOC_FAILURES");
158 if (cp != NULL && (md_failstring = strdup(cp)) != NULL)
160 if ((cp = getenv("OPENSSL_MALLOC_FD")) != NULL)
161 md_tracefd = atoi(cp);
165 void *CRYPTO_malloc(size_t num, const char *file, int line)
167 INCREMENT(malloc_count);
168 if (malloc_impl != CRYPTO_malloc)
169 return malloc_impl(num, file, line);
175 if (allow_customize) {
177 * Disallow customization after the first allocation. We only set this
178 * if necessary to avoid a store to the same cache line on every
187 void *CRYPTO_zalloc(size_t num, const char *file, int line)
191 ret = CRYPTO_malloc(num, file, line);
199 void *CRYPTO_realloc(void *str, size_t num, const char *file, int line)
201 INCREMENT(realloc_count);
202 if (realloc_impl != CRYPTO_realloc)
203 return realloc_impl(str, num, file, line);
207 return CRYPTO_malloc(num, file, line);
210 CRYPTO_free(str, file, line);
214 return realloc(str, num);
217 void *CRYPTO_clear_realloc(void *str, size_t old_len, size_t num,
218 const char *file, int line)
223 return CRYPTO_malloc(num, file, line);
226 CRYPTO_clear_free(str, old_len, file, line);
230 /* Can't shrink the buffer since memcpy below copies |old_len| bytes. */
232 OPENSSL_cleanse((char*)str + num, old_len - num);
236 ret = CRYPTO_malloc(num, file, line);
238 memcpy(ret, str, old_len);
239 CRYPTO_clear_free(str, old_len, file, line);
244 void CRYPTO_free(void *str, const char *file, int line)
246 INCREMENT(free_count);
247 if (free_impl != CRYPTO_free) {
248 free_impl(str, file, line);
255 void CRYPTO_clear_free(void *str, size_t num, const char *file, int line)
260 OPENSSL_cleanse(str, num);
261 CRYPTO_free(str, file, line);
264 #if !defined(OPENSSL_NO_CRYPTO_MDEBUG)
266 # ifndef OPENSSL_NO_DEPRECATED_3_0
267 int CRYPTO_mem_ctrl(int mode)
273 int CRYPTO_set_mem_debug(int flag)
279 int CRYPTO_mem_debug_push(const char *info, const char *file, int line)
281 (void)info; (void)file; (void)line;
285 int CRYPTO_mem_debug_pop(void)
290 void CRYPTO_mem_debug_malloc(void *addr, size_t num, int flag,
291 const char *file, int line)
293 (void)addr; (void)num; (void)flag; (void)file; (void)line;
296 void CRYPTO_mem_debug_realloc(void *addr1, void *addr2, size_t num, int flag,
297 const char *file, int line)
299 (void)addr1; (void)addr2; (void)num; (void)flag; (void)file; (void)line;
302 void CRYPTO_mem_debug_free(void *addr, int flag,
303 const char *file, int line)
305 (void)addr; (void)flag; (void)file; (void)line;
308 int CRYPTO_mem_leaks(BIO *b)
314 # ifndef OPENSSL_NO_STDIO
315 int CRYPTO_mem_leaks_fp(FILE *fp)
322 int CRYPTO_mem_leaks_cb(int (*cb)(const char *str, size_t len, void *u),