2 * Copyright 1995-2023 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
10 #include "internal/e_os.h"
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_MODULE)
27 # include "internal/tsan_assist.h"
29 # ifdef TSAN_REQUIRES_LOCKING
30 # define INCREMENT(x) /* empty */
32 # else /* TSAN_REQUIRES_LOCKING */
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))
38 # define LOAD(x) tsan_load(&x)
39 # endif /* TSAN_REQUIRES_LOCKING */
41 static char *md_failstring;
43 static int md_fail_percent = 0;
44 static int md_tracefd = -1;
46 static void parseit(void);
47 static int shouldfail(void);
49 # define FAILTEST() if (shouldfail()) return NULL
53 # define INCREMENT(x) /* empty */
54 # define FAILTEST() /* empty */
57 int CRYPTO_set_mem_functions(CRYPTO_malloc_fn malloc_fn,
58 CRYPTO_realloc_fn realloc_fn,
59 CRYPTO_free_fn free_fn)
63 if (malloc_fn != NULL)
64 malloc_impl = malloc_fn;
65 if (realloc_fn != NULL)
66 realloc_impl = realloc_fn;
72 void CRYPTO_get_mem_functions(CRYPTO_malloc_fn *malloc_fn,
73 CRYPTO_realloc_fn *realloc_fn,
74 CRYPTO_free_fn *free_fn)
76 if (malloc_fn != NULL)
77 *malloc_fn = malloc_impl;
78 if (realloc_fn != NULL)
79 *realloc_fn = realloc_impl;
84 #if !defined(OPENSSL_NO_CRYPTO_MDEBUG) && !defined(FIPS_MODULE)
85 void CRYPTO_get_alloc_counts(int *mcount, int *rcount, int *fcount)
88 *mcount = LOAD(malloc_count);
90 *rcount = LOAD(realloc_count);
92 *fcount = 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.
103 * The failure percentge can have 2 digits after the comma. For example:
105 * This means 0.01% of all allocations will fail.
107 static void parseit(void)
109 char *semi = strchr(md_failstring, ';');
115 /* Get the count (atol will stop at the @ if there), and percentage */
116 md_count = atol(md_failstring);
117 atsign = strchr(md_failstring, '@');
118 md_fail_percent = atsign == NULL ? 0 : (int)(atof(atsign + 1) * 100 + 0.5);
121 md_failstring = semi;
125 * Windows doesn't have random(), but it has rand()
126 * Some rand() implementations aren't good, but we're not
127 * dealing with secure randomness here.
130 # define random() rand()
133 * See if the current malloc should fail.
135 static int shouldfail(void)
137 int roll = (int)(random() % 10000);
138 int shoulditfail = roll < md_fail_percent;
140 /* suppressed on Windows as POSIX-like file descriptors are non-inheritable */
144 if (md_tracefd > 0) {
145 BIO_snprintf(buff, sizeof(buff),
146 "%c C%ld %%%d R%d\n",
147 shoulditfail ? '-' : '+', md_count, md_fail_percent, roll);
149 if (write(md_tracefd, buff, len) != len)
150 perror("shouldfail write failed");
155 /* If we used up this one, go to the next. */
163 void ossl_malloc_setup_failures(void)
165 const char *cp = getenv("OPENSSL_MALLOC_FAILURES");
167 if (cp != NULL && (md_failstring = strdup(cp)) != NULL)
169 if ((cp = getenv("OPENSSL_MALLOC_FD")) != NULL)
170 md_tracefd = atoi(cp);
171 if ((cp = getenv("OPENSSL_MALLOC_SEED")) != NULL)
176 void *CRYPTO_malloc(size_t num, const char *file, int line)
180 INCREMENT(malloc_count);
181 if (malloc_impl != CRYPTO_malloc) {
182 ptr = malloc_impl(num, file, line);
183 if (ptr != NULL || num == 0)
192 if (allow_customize) {
194 * Disallow customization after the first allocation. We only set this
195 * if necessary to avoid a store to the same cache line on every
206 * ossl_err_get_state_int() in err.c uses CRYPTO_zalloc(num, NULL, 0) for
207 * ERR_STATE allocation. Prevent mem alloc error loop while reporting error.
209 if (file != NULL || line != 0) {
211 ERR_set_debug(file, line, NULL);
212 ERR_set_error(ERR_LIB_CRYPTO, ERR_R_MALLOC_FAILURE, NULL);
217 void *CRYPTO_zalloc(size_t num, const char *file, int line)
221 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 != CRYPTO_realloc)
232 return realloc_impl(str, num, file, line);
235 return CRYPTO_malloc(num, file, line);
238 CRYPTO_free(str, file, line);
243 return realloc(str, num);
246 void *CRYPTO_clear_realloc(void *str, size_t old_len, size_t num,
247 const char *file, int line)
252 return CRYPTO_malloc(num, file, line);
255 CRYPTO_clear_free(str, old_len, file, line);
259 /* Can't shrink the buffer since memcpy below copies |old_len| bytes. */
261 OPENSSL_cleanse((char*)str + num, old_len - num);
265 ret = CRYPTO_malloc(num, file, line);
267 memcpy(ret, str, old_len);
268 CRYPTO_clear_free(str, old_len, file, line);
273 void CRYPTO_free(void *str, const char *file, int line)
275 INCREMENT(free_count);
276 if (free_impl != CRYPTO_free) {
277 free_impl(str, file, line);
284 void CRYPTO_clear_free(void *str, size_t num, const char *file, int line)
289 OPENSSL_cleanse(str, num);
290 CRYPTO_free(str, file, line);
293 #if !defined(OPENSSL_NO_CRYPTO_MDEBUG)
295 # ifndef OPENSSL_NO_DEPRECATED_3_0
296 int CRYPTO_mem_ctrl(int mode)
302 int CRYPTO_set_mem_debug(int flag)
308 int CRYPTO_mem_debug_push(const char *info, const char *file, int line)
310 (void)info; (void)file; (void)line;
314 int CRYPTO_mem_debug_pop(void)
319 void CRYPTO_mem_debug_malloc(void *addr, size_t num, int flag,
320 const char *file, int line)
322 (void)addr; (void)num; (void)flag; (void)file; (void)line;
325 void CRYPTO_mem_debug_realloc(void *addr1, void *addr2, size_t num, int flag,
326 const char *file, int line)
328 (void)addr1; (void)addr2; (void)num; (void)flag; (void)file; (void)line;
331 void CRYPTO_mem_debug_free(void *addr, int flag,
332 const char *file, int line)
334 (void)addr; (void)flag; (void)file; (void)line;
337 int CRYPTO_mem_leaks(BIO *b)
343 # ifndef OPENSSL_NO_STDIO
344 int CRYPTO_mem_leaks_fp(FILE *fp)
351 int CRYPTO_mem_leaks_cb(int (*cb)(const char *str, size_t len, void *u),