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;
23 static void *(*malloc_impl)(size_t, const char *, int)
25 static void *(*realloc_impl)(void *, size_t, const char *, int)
27 static void (*free_impl)(void *, const char *, int)
30 #if !defined(OPENSSL_NO_CRYPTO_MDEBUG) && !defined(FIPS_MODE)
31 # include "internal/tsan_assist.h"
33 static TSAN_QUALIFIER int malloc_count;
34 static TSAN_QUALIFIER int realloc_count;
35 static TSAN_QUALIFIER int free_count;
37 # define INCREMENT(x) tsan_counter(&(x))
39 static char *md_failstring;
41 static int md_fail_percent = 0;
42 static int md_tracefd = -1;
44 static void parseit(void);
45 static int shouldfail(void);
47 # define FAILTEST() if (shouldfail()) return NULL
51 # define INCREMENT(x) /* empty */
52 # define FAILTEST() /* empty */
55 int CRYPTO_set_mem_functions(
56 void *(*m)(size_t, const char *, int),
57 void *(*r)(void *, size_t, const char *, int),
58 void (*f)(void *, const char *, int))
71 void CRYPTO_get_mem_functions(
72 void *(**m)(size_t, const char *, int),
73 void *(**r)(void *, size_t, const char *, int),
74 void (**f)(void *, const char *, int))
84 #if !defined(OPENSSL_NO_CRYPTO_MDEBUG) && !defined(FIPS_MODE)
85 void CRYPTO_get_alloc_counts(int *mcount, int *rcount, int *fcount)
88 *mcount = tsan_load(&malloc_count);
90 *rcount = tsan_load(&realloc_count);
92 *fcount = tsan_load(&free_count);
96 * Parse a "malloc failure spec" string. This likes like a set of fields
97 * separated by semicolons. Each field has a count and an optional failure
98 * percentage. For example:
101 * This means 100 mallocs succeed, then next 100 fail 25% of the time, and
102 * all remaining (count is zero) succeed.
104 static void parseit(void)
106 char *semi = strchr(md_failstring, ';');
112 /* Get the count (atol will stop at the @ if there), and percentage */
113 md_count = atol(md_failstring);
114 atsign = strchr(md_failstring, '@');
115 md_fail_percent = atsign == NULL ? 0 : atoi(atsign + 1);
118 md_failstring = semi;
122 * Windows doesn't have random(), but it has rand()
123 * Some rand() implementations aren't good, but we're not
124 * dealing with secure randomness here.
127 # define random() rand()
130 * See if the current malloc should fail.
132 static int shouldfail(void)
134 int roll = (int)(random() % 100);
135 int shoulditfail = roll < md_fail_percent;
137 /* suppressed on Windows as POSIX-like file descriptors are non-inheritable */
141 if (md_tracefd > 0) {
142 BIO_snprintf(buff, sizeof(buff),
143 "%c C%ld %%%d R%d\n",
144 shoulditfail ? '-' : '+', md_count, md_fail_percent, roll);
146 if (write(md_tracefd, buff, len) != len)
147 perror("shouldfail write failed");
152 /* If we used up this one, go to the next. */
160 void ossl_malloc_setup_failures(void)
162 const char *cp = getenv("OPENSSL_MALLOC_FAILURES");
164 if (cp != NULL && (md_failstring = strdup(cp)) != NULL)
166 if ((cp = getenv("OPENSSL_MALLOC_FD")) != NULL)
167 md_tracefd = atoi(cp);
171 void *CRYPTO_malloc(size_t num, const char *file, int line)
175 INCREMENT(malloc_count);
176 if (malloc_impl != NULL && malloc_impl != CRYPTO_malloc)
177 return malloc_impl(num, file, line);
183 if (allow_customize) {
185 * Disallow customization after the first allocation. We only set this
186 * if necessary to avoid a store to the same cache line on every
191 (void)(file); (void)(line);
197 void *CRYPTO_zalloc(size_t num, const char *file, int line)
199 void *ret = CRYPTO_malloc(num, file, line);
207 void *CRYPTO_realloc(void *str, size_t num, const char *file, int line)
209 INCREMENT(realloc_count);
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);
222 (void)(file); (void)(line);
223 return realloc(str, num);
227 void *CRYPTO_clear_realloc(void *str, size_t old_len, size_t num,
228 const char *file, int line)
233 return CRYPTO_malloc(num, file, line);
236 CRYPTO_clear_free(str, old_len, file, line);
240 /* Can't shrink the buffer since memcpy below copies |old_len| bytes. */
242 OPENSSL_cleanse((char*)str + num, old_len - num);
246 ret = CRYPTO_malloc(num, file, line);
248 memcpy(ret, str, old_len);
249 CRYPTO_clear_free(str, old_len, file, line);
254 void CRYPTO_free(void *str, const char *file, int line)
256 INCREMENT(free_count);
257 if (free_impl != NULL && free_impl != &CRYPTO_free) {
258 free_impl(str, file, line);
265 void CRYPTO_clear_free(void *str, size_t num, const char *file, int line)
270 OPENSSL_cleanse(str, num);
271 CRYPTO_free(str, file, line);
274 #if !defined(OPENSSL_NO_CRYPTO_MDEBUG)
276 # ifndef OPENSSL_NO_DEPRECATED_3_0
277 int CRYPTO_mem_ctrl(int mode)
283 int CRYPTO_set_mem_debug(int flag)
289 int CRYPTO_mem_debug_push(const char *info, const char *file, int line)
291 (void)info; (void)file; (void)line;
295 int CRYPTO_mem_debug_pop(void)
300 void CRYPTO_mem_debug_malloc(void *addr, size_t num, int flag,
301 const char *file, int line)
303 (void)addr; (void)num; (void)flag; (void)file; (void)line;
306 void CRYPTO_mem_debug_realloc(void *addr1, void *addr2, size_t num, int flag,
307 const char *file, int line)
309 (void)addr1; (void)addr2; (void)num; (void)flag; (void)file; (void)line;
312 void CRYPTO_mem_debug_free(void *addr, int flag,
313 const char *file, int line)
315 (void)addr; (void)flag; (void)file; (void)line;
318 int CRYPTO_mem_leaks(BIO *b)
324 # ifndef OPENSSL_NO_STDIO
325 int CRYPTO_mem_leaks_fp(FILE *fp)
332 int CRYPTO_mem_leaks_cb(int (*cb)(const char *str, size_t len, void *u),