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git.ipfire.org Git - thirdparty/openssl.git/blob - crypto/mem.c
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 "internal/cryptlib_int.h"
16 #include <openssl/crypto.h>
17 #if !defined(OPENSSL_NO_CRYPTO_MDEBUG_BACKTRACE) && !defined(FIPS_MODE)
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 #if !defined(OPENSSL_NO_CRYPTO_MDEBUG) && !defined(FIPS_MODE)
34 # include "internal/tsan_assist.h"
36 static TSAN_QUALIFIER
int malloc_count
;
37 static TSAN_QUALIFIER
int realloc_count
;
38 static TSAN_QUALIFIER
int free_count
;
40 # define INCREMENT(x) tsan_counter(&(x))
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 #if !defined(OPENSSL_NO_CRYPTO_MDEBUG) && !defined(FIPS_MODE)
98 void CRYPTO_get_alloc_counts(int *mcount
, int *rcount
, int *fcount
)
101 *mcount
= tsan_load(&malloc_count
);
103 *rcount
= tsan_load(&realloc_count
);
105 *fcount
= tsan_load(&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
;
150 /* suppressed on Windows as POSIX-like file descriptors are non-inheritable */
154 if (md_tracefd
> 0) {
155 BIO_snprintf(buff
, sizeof(buff
),
156 "%c C%ld %%%d R%d\n",
157 shoulditfail
? '-' : '+', md_count
, md_fail_percent
, roll
);
159 if (write(md_tracefd
, buff
, len
) != len
)
160 perror("shouldfail write failed");
161 # ifndef OPENSSL_NO_CRYPTO_MDEBUG_BACKTRACE
164 int num
= backtrace(addrs
, OSSL_NELEM(addrs
));
166 backtrace_symbols_fd(addrs
, num
, md_tracefd
);
173 /* If we used up this one, go to the next. */
181 void ossl_malloc_setup_failures(void)
183 const char *cp
= getenv("OPENSSL_MALLOC_FAILURES");
185 if (cp
!= NULL
&& (md_failstring
= strdup(cp
)) != NULL
)
187 if ((cp
= getenv("OPENSSL_MALLOC_FD")) != NULL
)
188 md_tracefd
= atoi(cp
);
192 void *CRYPTO_malloc(size_t num
, const char *file
, int line
)
196 INCREMENT(malloc_count
);
197 if (malloc_impl
!= NULL
&& malloc_impl
!= CRYPTO_malloc
)
198 return malloc_impl(num
, file
, line
);
204 if (allow_customize
) {
206 * Disallow customization after the first allocation. We only set this
207 * if necessary to avoid a store to the same cache line on every
212 #if !defined(OPENSSL_NO_CRYPTO_MDEBUG) && !defined(FIPS_MODE)
213 if (call_malloc_debug
) {
214 CRYPTO_mem_debug_malloc(NULL
, num
, 0, file
, line
);
216 CRYPTO_mem_debug_malloc(ret
, num
, 1, file
, line
);
221 (void)(file
); (void)(line
);
228 void *CRYPTO_zalloc(size_t num
, const char *file
, int line
)
230 void *ret
= CRYPTO_malloc(num
, file
, line
);
238 void *CRYPTO_realloc(void *str
, size_t num
, const char *file
, int line
)
240 INCREMENT(realloc_count
);
241 if (realloc_impl
!= NULL
&& realloc_impl
!= &CRYPTO_realloc
)
242 return realloc_impl(str
, num
, file
, line
);
246 return CRYPTO_malloc(num
, file
, line
);
249 CRYPTO_free(str
, file
, line
);
253 #if !defined(OPENSSL_NO_CRYPTO_MDEBUG) && !defined(FIPS_MODE)
254 if (call_malloc_debug
) {
256 CRYPTO_mem_debug_realloc(str
, NULL
, num
, 0, file
, line
);
257 ret
= realloc(str
, num
);
258 CRYPTO_mem_debug_realloc(str
, ret
, num
, 1, file
, line
);
262 (void)(file
); (void)(line
);
264 return realloc(str
, num
);
268 void *CRYPTO_clear_realloc(void *str
, size_t old_len
, size_t num
,
269 const char *file
, int line
)
274 return CRYPTO_malloc(num
, file
, line
);
277 CRYPTO_clear_free(str
, old_len
, file
, line
);
281 /* Can't shrink the buffer since memcpy below copies |old_len| bytes. */
283 OPENSSL_cleanse((char*)str
+ num
, old_len
- num
);
287 ret
= CRYPTO_malloc(num
, file
, line
);
289 memcpy(ret
, str
, old_len
);
290 CRYPTO_clear_free(str
, old_len
, file
, line
);
295 void CRYPTO_free(void *str
, const char *file
, int line
)
297 INCREMENT(free_count
);
298 if (free_impl
!= NULL
&& free_impl
!= &CRYPTO_free
) {
299 free_impl(str
, file
, line
);
303 #if !defined(OPENSSL_NO_CRYPTO_MDEBUG) && !defined(FIPS_MODE)
304 if (call_malloc_debug
) {
305 CRYPTO_mem_debug_free(str
, 0, file
, line
);
307 CRYPTO_mem_debug_free(str
, 1, file
, line
);
316 void CRYPTO_clear_free(void *str
, size_t num
, const char *file
, int line
)
321 OPENSSL_cleanse(str
, num
);
322 CRYPTO_free(str
, file
, line
);