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git.ipfire.org Git - thirdparty/openssl.git/blob - crypto/mem.c
2 * Copyright 1995-2016 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>
14 #include "internal/cryptlib.h"
15 #include "internal/cryptlib_int.h"
16 #ifndef OPENSSL_NO_CRYPTO_MDEBUG_BACKTRACE
17 # include <execinfo.h>
21 * the following pointers may be changed as long as 'allow_customize' is set
23 static int allow_customize
= 1;
25 static void *(*malloc_impl
)(size_t, const char *, int)
27 static void *(*realloc_impl
)(void *, size_t, const char *, int)
29 static void (*free_impl
)(void *, const char *, int)
32 #ifndef OPENSSL_NO_CRYPTO_MDEBUG
33 static char *md_failstring
;
35 static int md_fail_percent
= 0;
36 static int md_tracefd
= -1;
37 static int call_malloc_debug
= 1;
39 static void parseit(void);
40 static int shouldfail(void);
42 # define FAILTEST() if (shouldfail()) return NULL
45 static int call_malloc_debug
= 0;
47 # define FAILTEST() /* empty */
50 int CRYPTO_set_mem_functions(
51 void *(*m
)(size_t, const char *, int),
52 void *(*r
)(void *, size_t, const char *, int),
53 void (*f
)(void *, const char *, int))
66 int CRYPTO_set_mem_debug(int flag
)
70 call_malloc_debug
= flag
;
74 void CRYPTO_get_mem_functions(
75 void *(**m
)(size_t, const char *, int),
76 void *(**r
)(void *, size_t, const char *, int),
77 void (**f
)(void *, const char *, int))
87 #ifndef OPENSSL_NO_CRYPTO_MDEBUG
89 * Parse a "malloc failure spec" string. This likes like a set of fields
90 * separated by semicolons. Each field has a count and an optional failure
91 * percentage. For example:
94 * This means 100 mallocs succeed, then next 100 fail 25% of the time, and
95 * all remaining (count is zero) succeed.
97 static void parseit(void)
99 char *semi
= strchr(md_failstring
, ';');
105 /* Get the count (atol will stop at the @ if there), and percentage */
106 md_count
= atol(md_failstring
);
107 atsign
= strchr(md_failstring
, '@');
108 md_fail_percent
= atsign
== NULL
? 0 : atoi(atsign
+ 1);
111 md_failstring
= semi
;
115 * See if the current malloc should fail.
117 static int shouldfail(void)
119 int roll
= (int)(random() % 100);
120 int shouldfail
= roll
< md_fail_percent
;
123 if (md_tracefd
> 0) {
124 BIO_snprintf(buff
, sizeof(buff
),
125 "%c C%ld %%%d R%d\n",
126 shouldfail
? '-' : '+', md_count
, md_fail_percent
, roll
);
127 write(md_tracefd
, buff
, strlen(buff
));
128 #ifndef OPENSSL_NO_CRYPTO_MDEBUG_BACKTRACE
131 int num
= backtrace(addrs
, OSSL_NELEM(addrs
));
133 backtrace_symbols_fd(addrs
, num
, md_tracefd
);
139 /* If we used up this one, go to the next. */
147 void ossl_malloc_setup_failures(void)
149 const char *cp
= getenv("OPENSSL_MALLOC_FAILURES");
151 if (cp
!= NULL
&& (md_failstring
= strdup(cp
)) != NULL
)
153 if ((cp
= getenv("OPENSSL_MALLOC_FD")) != NULL
)
154 md_tracefd
= atoi(cp
);
158 void *CRYPTO_malloc(size_t num
, const char *file
, int line
)
162 if (malloc_impl
!= NULL
&& malloc_impl
!= CRYPTO_malloc
)
163 return malloc_impl(num
, file
, line
);
170 #ifndef OPENSSL_NO_CRYPTO_MDEBUG
171 if (call_malloc_debug
) {
172 CRYPTO_mem_debug_malloc(NULL
, num
, 0, file
, line
);
174 CRYPTO_mem_debug_malloc(ret
, num
, 1, file
, line
);
179 osslargused(file
); osslargused(line
);
186 void *CRYPTO_zalloc(size_t num
, const char *file
, int line
)
188 void *ret
= CRYPTO_malloc(num
, file
, line
);
196 void *CRYPTO_realloc(void *str
, size_t num
, const char *file
, int line
)
198 if (realloc_impl
!= NULL
&& realloc_impl
!= &CRYPTO_realloc
)
199 return realloc_impl(str
, num
, file
, line
);
203 return CRYPTO_malloc(num
, file
, line
);
206 CRYPTO_free(str
, file
, line
);
211 #ifndef OPENSSL_NO_CRYPTO_MDEBUG
212 if (call_malloc_debug
) {
214 CRYPTO_mem_debug_realloc(str
, NULL
, num
, 0, file
, line
);
215 ret
= realloc(str
, num
);
216 CRYPTO_mem_debug_realloc(str
, ret
, num
, 1, file
, line
);
220 osslargused(file
); osslargused(line
);
222 return realloc(str
, num
);
226 void *CRYPTO_clear_realloc(void *str
, size_t old_len
, size_t num
,
227 const char *file
, int line
)
232 return CRYPTO_malloc(num
, file
, line
);
235 CRYPTO_clear_free(str
, old_len
, file
, line
);
239 /* Can't shrink the buffer since memcpy below copies |old_len| bytes. */
241 OPENSSL_cleanse((char*)str
+ num
, old_len
- num
);
245 ret
= CRYPTO_malloc(num
, file
, line
);
247 memcpy(ret
, str
, old_len
);
248 CRYPTO_clear_free(str
, old_len
, file
, line
);
253 void CRYPTO_free(void *str
, const char *file
, int line
)
255 if (free_impl
!= NULL
&& free_impl
!= &CRYPTO_free
) {
256 free_impl(str
, file
, line
);
260 #ifndef OPENSSL_NO_CRYPTO_MDEBUG
261 if (call_malloc_debug
) {
262 CRYPTO_mem_debug_free(str
, 0, file
, line
);
264 CRYPTO_mem_debug_free(str
, 1, file
, line
);
273 void CRYPTO_clear_free(void *str
, size_t num
, const char *file
, int line
)
278 OPENSSL_cleanse(str
, num
);
279 CRYPTO_free(str
, file
, line
);