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
10 /* TODO: When ERR_STATE becomes opaque, this musts be removed */
11 #define OSSL_FORCE_ERR_STATE
16 #include "crypto/cryptlib.h"
17 #include "internal/err.h"
18 #include "crypto/err.h"
19 #include <openssl/err.h>
20 #include <openssl/crypto.h>
21 #include <openssl/buffer.h>
22 #include <openssl/bio.h>
23 #include <openssl/opensslconf.h>
24 #include "internal/thread_once.h"
25 #include "crypto/ctype.h"
26 #include "internal/constant_time.h"
28 #include "err_local.h"
30 /* Forward declaration in case it's not published because of configuration */
31 ERR_STATE *ERR_get_state(void);
33 static int err_load_strings(const ERR_STRING_DATA *str);
35 static void ERR_STATE_free(ERR_STATE *s);
36 #ifndef OPENSSL_NO_ERR
37 static ERR_STRING_DATA ERR_str_libraries[] = {
38 {ERR_PACK(ERR_LIB_NONE, 0, 0), "unknown library"},
39 {ERR_PACK(ERR_LIB_SYS, 0, 0), "system library"},
40 {ERR_PACK(ERR_LIB_BN, 0, 0), "bignum routines"},
41 {ERR_PACK(ERR_LIB_RSA, 0, 0), "rsa routines"},
42 {ERR_PACK(ERR_LIB_DH, 0, 0), "Diffie-Hellman routines"},
43 {ERR_PACK(ERR_LIB_EVP, 0, 0), "digital envelope routines"},
44 {ERR_PACK(ERR_LIB_BUF, 0, 0), "memory buffer routines"},
45 {ERR_PACK(ERR_LIB_OBJ, 0, 0), "object identifier routines"},
46 {ERR_PACK(ERR_LIB_PEM, 0, 0), "PEM routines"},
47 {ERR_PACK(ERR_LIB_DSA, 0, 0), "dsa routines"},
48 {ERR_PACK(ERR_LIB_X509, 0, 0), "x509 certificate routines"},
49 {ERR_PACK(ERR_LIB_ASN1, 0, 0), "asn1 encoding routines"},
50 {ERR_PACK(ERR_LIB_CONF, 0, 0), "configuration file routines"},
51 {ERR_PACK(ERR_LIB_CRYPTO, 0, 0), "common libcrypto routines"},
52 {ERR_PACK(ERR_LIB_EC, 0, 0), "elliptic curve routines"},
53 {ERR_PACK(ERR_LIB_ECDSA, 0, 0), "ECDSA routines"},
54 {ERR_PACK(ERR_LIB_ECDH, 0, 0), "ECDH routines"},
55 {ERR_PACK(ERR_LIB_SSL, 0, 0), "SSL routines"},
56 {ERR_PACK(ERR_LIB_BIO, 0, 0), "BIO routines"},
57 {ERR_PACK(ERR_LIB_PKCS7, 0, 0), "PKCS7 routines"},
58 {ERR_PACK(ERR_LIB_X509V3, 0, 0), "X509 V3 routines"},
59 {ERR_PACK(ERR_LIB_PKCS12, 0, 0), "PKCS12 routines"},
60 {ERR_PACK(ERR_LIB_RAND, 0, 0), "random number generator"},
61 {ERR_PACK(ERR_LIB_DSO, 0, 0), "DSO support routines"},
62 {ERR_PACK(ERR_LIB_TS, 0, 0), "time stamp routines"},
63 {ERR_PACK(ERR_LIB_ENGINE, 0, 0), "engine routines"},
64 {ERR_PACK(ERR_LIB_OCSP, 0, 0), "OCSP routines"},
65 {ERR_PACK(ERR_LIB_UI, 0, 0), "UI routines"},
66 {ERR_PACK(ERR_LIB_FIPS, 0, 0), "FIPS routines"},
67 {ERR_PACK(ERR_LIB_CMS, 0, 0), "CMS routines"},
68 {ERR_PACK(ERR_LIB_CRMF, 0, 0), "CRMF routines"},
69 {ERR_PACK(ERR_LIB_CMP, 0, 0), "CMP routines"},
70 {ERR_PACK(ERR_LIB_HMAC, 0, 0), "HMAC routines"},
71 {ERR_PACK(ERR_LIB_CT, 0, 0), "CT routines"},
72 {ERR_PACK(ERR_LIB_ASYNC, 0, 0), "ASYNC routines"},
73 {ERR_PACK(ERR_LIB_OSSL_STORE, 0, 0), "STORE routines"},
74 {ERR_PACK(ERR_LIB_SM2, 0, 0), "SM2 routines"},
75 {ERR_PACK(ERR_LIB_ESS, 0, 0), "ESS routines"},
76 {ERR_PACK(ERR_LIB_PROV, 0, 0), "Provider routines"},
80 static ERR_STRING_DATA ERR_str_reasons[] = {
81 {ERR_R_SYS_LIB, "system lib"},
82 {ERR_R_BN_LIB, "BN lib"},
83 {ERR_R_RSA_LIB, "RSA lib"},
84 {ERR_R_DH_LIB, "DH lib"},
85 {ERR_R_EVP_LIB, "EVP lib"},
86 {ERR_R_BUF_LIB, "BUF lib"},
87 {ERR_R_OBJ_LIB, "OBJ lib"},
88 {ERR_R_PEM_LIB, "PEM lib"},
89 {ERR_R_DSA_LIB, "DSA lib"},
90 {ERR_R_X509_LIB, "X509 lib"},
91 {ERR_R_ASN1_LIB, "ASN1 lib"},
92 {ERR_R_EC_LIB, "EC lib"},
93 {ERR_R_BIO_LIB, "BIO lib"},
94 {ERR_R_PKCS7_LIB, "PKCS7 lib"},
95 {ERR_R_X509V3_LIB, "X509V3 lib"},
96 {ERR_R_ENGINE_LIB, "ENGINE lib"},
97 {ERR_R_UI_LIB, "UI lib"},
98 {ERR_R_OSSL_STORE_LIB, "STORE lib"},
99 {ERR_R_ECDSA_LIB, "ECDSA lib"},
101 {ERR_R_NESTED_ASN1_ERROR, "nested asn1 error"},
102 {ERR_R_MISSING_ASN1_EOS, "missing asn1 eos"},
104 {ERR_R_FATAL, "fatal"},
105 {ERR_R_MALLOC_FAILURE, "malloc failure"},
106 {ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED,
107 "called a function you should not call"},
108 {ERR_R_PASSED_NULL_PARAMETER, "passed a null parameter"},
109 {ERR_R_INTERNAL_ERROR, "internal error"},
110 {ERR_R_DISABLED, "called a function that was disabled at compile-time"},
111 {ERR_R_INIT_FAIL, "init fail"},
112 {ERR_R_OPERATION_FAIL, "operation fail"},
118 static CRYPTO_ONCE err_init = CRYPTO_ONCE_STATIC_INIT;
119 static int set_err_thread_local;
120 static CRYPTO_THREAD_LOCAL err_thread_local;
122 static CRYPTO_ONCE err_string_init = CRYPTO_ONCE_STATIC_INIT;
123 static CRYPTO_RWLOCK *err_string_lock;
125 static ERR_STRING_DATA *int_err_get_item(const ERR_STRING_DATA *);
131 static LHASH_OF(ERR_STRING_DATA) *int_error_hash = NULL;
132 static int int_err_library_number = ERR_LIB_USER;
134 typedef enum ERR_GET_ACTION_e {
135 EV_POP, EV_PEEK, EV_PEEK_LAST
138 static unsigned long get_error_values(ERR_GET_ACTION g,
139 const char **file, int *line,
140 const char **func, const char **data,
143 static unsigned long err_string_data_hash(const ERR_STRING_DATA *a)
145 unsigned long ret, l;
148 ret = l ^ ERR_GET_LIB(l);
149 return (ret ^ ret % 19 * 13);
152 static int err_string_data_cmp(const ERR_STRING_DATA *a,
153 const ERR_STRING_DATA *b)
155 if (a->error == b->error)
157 return a->error > b->error ? 1 : -1;
160 static ERR_STRING_DATA *int_err_get_item(const ERR_STRING_DATA *d)
162 ERR_STRING_DATA *p = NULL;
164 CRYPTO_THREAD_read_lock(err_string_lock);
165 p = lh_ERR_STRING_DATA_retrieve(int_error_hash, d);
166 CRYPTO_THREAD_unlock(err_string_lock);
171 #ifndef OPENSSL_NO_ERR
172 /* 2019-05-21: Russian and Ukrainian locales on Linux require more than 6,5 kB */
173 # define SPACE_SYS_STR_REASONS 8 * 1024
174 # define NUM_SYS_STR_REASONS 127
176 static ERR_STRING_DATA SYS_str_reasons[NUM_SYS_STR_REASONS + 1];
178 * SYS_str_reasons is filled with copies of strerror() results at
179 * initialization. 'errno' values up to 127 should cover all usual errors,
180 * others will be displayed numerically by ERR_error_string. It is crucial
181 * that we have something for each reason code that occurs in
182 * ERR_str_reasons, or bogus reason strings will be returned for SYSerr(),
183 * which always gets an errno value and never one of those 'standard' reason
187 static void build_SYS_str_reasons(void)
189 /* OPENSSL_malloc cannot be used here, use static storage instead */
190 static char strerror_pool[SPACE_SYS_STR_REASONS];
191 char *cur = strerror_pool;
195 int saveerrno = get_last_sys_error();
197 CRYPTO_THREAD_write_lock(err_string_lock);
199 CRYPTO_THREAD_unlock(err_string_lock);
203 for (i = 1; i <= NUM_SYS_STR_REASONS; i++) {
204 ERR_STRING_DATA *str = &SYS_str_reasons[i - 1];
206 str->error = ERR_PACK(ERR_LIB_SYS, 0, i);
208 * If we have used up all the space in strerror_pool,
209 * there's no point in calling openssl_strerror_r()
211 if (str->string == NULL && cnt < sizeof(strerror_pool)) {
212 if (openssl_strerror_r(i, cur, sizeof(strerror_pool) - cnt)) {
213 size_t l = strlen(cur);
220 * VMS has an unusual quirk of adding spaces at the end of
221 * some (most? all?) messages. Lets trim them off.
223 while (cur > strerror_pool && ossl_isspace(cur[-1])) {
231 if (str->string == NULL)
232 str->string = "unknown";
236 * Now we still have SYS_str_reasons[NUM_SYS_STR_REASONS] = {0, NULL}, as
237 * required by ERR_load_strings.
242 CRYPTO_THREAD_unlock(err_string_lock);
243 /* openssl_strerror_r could change errno, but we want to preserve it */
244 set_sys_error(saveerrno);
245 err_load_strings(SYS_str_reasons);
249 static void ERR_STATE_free(ERR_STATE *s)
255 for (i = 0; i < ERR_NUM_ERRORS; i++) {
256 err_clear_data(s, i, 1);
261 DEFINE_RUN_ONCE_STATIC(do_err_strings_init)
263 if (!OPENSSL_init_crypto(0, NULL))
265 err_string_lock = CRYPTO_THREAD_lock_new();
266 if (err_string_lock == NULL)
268 int_error_hash = lh_ERR_STRING_DATA_new(err_string_data_hash,
269 err_string_data_cmp);
270 if (int_error_hash == NULL) {
271 CRYPTO_THREAD_lock_free(err_string_lock);
272 err_string_lock = NULL;
278 void err_cleanup(void)
280 if (set_err_thread_local != 0)
281 CRYPTO_THREAD_cleanup_local(&err_thread_local);
282 CRYPTO_THREAD_lock_free(err_string_lock);
283 err_string_lock = NULL;
284 lh_ERR_STRING_DATA_free(int_error_hash);
285 int_error_hash = NULL;
289 * Legacy; pack in the library.
291 static void err_patch(int lib, ERR_STRING_DATA *str)
293 unsigned long plib = ERR_PACK(lib, 0, 0);
295 for (; str->error != 0; str++)
300 * Hash in |str| error strings. Assumes the URN_ONCE was done.
302 static int err_load_strings(const ERR_STRING_DATA *str)
304 CRYPTO_THREAD_write_lock(err_string_lock);
305 for (; str->error; str++)
306 (void)lh_ERR_STRING_DATA_insert(int_error_hash,
307 (ERR_STRING_DATA *)str);
308 CRYPTO_THREAD_unlock(err_string_lock);
312 int ERR_load_ERR_strings(void)
314 #ifndef OPENSSL_NO_ERR
315 if (!RUN_ONCE(&err_string_init, do_err_strings_init))
318 err_load_strings(ERR_str_libraries);
319 err_load_strings(ERR_str_reasons);
320 build_SYS_str_reasons();
325 int ERR_load_strings(int lib, ERR_STRING_DATA *str)
327 if (ERR_load_ERR_strings() == 0)
331 err_load_strings(str);
335 int ERR_load_strings_const(const ERR_STRING_DATA *str)
337 if (ERR_load_ERR_strings() == 0)
339 err_load_strings(str);
343 int ERR_unload_strings(int lib, ERR_STRING_DATA *str)
345 if (!RUN_ONCE(&err_string_init, do_err_strings_init))
348 CRYPTO_THREAD_write_lock(err_string_lock);
350 * We don't need to ERR_PACK the lib, since that was done (to
351 * the table) when it was loaded.
353 for (; str->error; str++)
354 (void)lh_ERR_STRING_DATA_delete(int_error_hash, str);
355 CRYPTO_THREAD_unlock(err_string_lock);
360 void err_free_strings_int(void)
362 if (!RUN_ONCE(&err_string_init, do_err_strings_init))
366 /********************************************************/
368 void ERR_clear_error(void)
373 es = err_get_state_int();
377 for (i = 0; i < ERR_NUM_ERRORS; i++) {
380 es->top = es->bottom = 0;
383 unsigned long ERR_get_error(void)
385 return get_error_values(EV_POP, NULL, NULL, NULL, NULL, NULL);
388 unsigned long ERR_get_error_line(const char **file, int *line)
390 return get_error_values(EV_POP, file, line, NULL, NULL, NULL);
393 unsigned long ERR_get_error_func(const char **func)
395 return get_error_values(EV_POP, NULL, NULL, func, NULL, NULL);
398 unsigned long ERR_get_error_data(const char **data, int *flags)
400 return get_error_values(EV_POP, NULL, NULL, NULL, data, flags);
403 unsigned long ERR_get_error_all(const char **file, int *line,
405 const char **data, int *flags)
407 return get_error_values(EV_POP, file, line, func, data, flags);
411 unsigned long ERR_get_error_line_data(const char **file, int *line,
412 const char **data, int *flags)
414 return get_error_values(EV_POP, file, line, NULL, data, flags);
418 unsigned long ERR_peek_error(void)
420 return get_error_values(EV_PEEK, NULL, NULL, NULL, NULL, NULL);
423 unsigned long ERR_peek_error_line(const char **file, int *line)
425 return get_error_values(EV_PEEK, file, line, NULL, NULL, NULL);
428 unsigned long ERR_peek_error_func(const char **func)
430 return get_error_values(EV_PEEK, NULL, NULL, func, NULL, NULL);
433 unsigned long ERR_peek_error_data(const char **data, int *flags)
435 return get_error_values(EV_PEEK, NULL, NULL, NULL, data, flags);
438 unsigned long ERR_peek_error_all(const char **file, int *line,
440 const char **data, int *flags)
442 return get_error_values(EV_PEEK, file, line, func, data, flags);
446 unsigned long ERR_peek_error_line_data(const char **file, int *line,
447 const char **data, int *flags)
449 return get_error_values(EV_PEEK, file, line, NULL, data, flags);
453 unsigned long ERR_peek_last_error(void)
455 return get_error_values(EV_PEEK_LAST, NULL, NULL, NULL, NULL, NULL);
458 unsigned long ERR_peek_last_error_line(const char **file, int *line)
460 return get_error_values(EV_PEEK_LAST, file, line, NULL, NULL, NULL);
463 unsigned long ERR_peek_last_error_func(const char **func)
465 return get_error_values(EV_PEEK_LAST, NULL, NULL, func, NULL, NULL);
468 unsigned long ERR_peek_last_error_data(const char **data, int *flags)
470 return get_error_values(EV_PEEK_LAST, NULL, NULL, NULL, data, flags);
473 unsigned long ERR_peek_last_error_all(const char **file, int *line,
475 const char **data, int *flags)
477 return get_error_values(EV_PEEK_LAST, file, line, func, data, flags);
481 unsigned long ERR_peek_last_error_line_data(const char **file, int *line,
482 const char **data, int *flags)
484 return get_error_values(EV_PEEK_LAST, file, line, NULL, data, flags);
488 static unsigned long get_error_values(ERR_GET_ACTION g,
489 const char **file, int *line,
491 const char **data, int *flags)
497 es = err_get_state_int();
502 * Clear anything that should have been cleared earlier. We do this
503 * here because this doesn't have constant-time issues.
505 while (es->bottom != es->top) {
506 if (es->err_flags[es->top] & ERR_FLAG_CLEAR) {
507 err_clear(es, es->top, 0);
508 es->top = es->top > 0 ? es->top - 1 : ERR_NUM_ERRORS - 1;
511 i = (es->bottom + 1) % ERR_NUM_ERRORS;
512 if (es->err_flags[i] & ERR_FLAG_CLEAR) {
514 err_clear(es, es->bottom, 0);
520 /* If everything has been cleared, the stack is empty. */
521 if (es->bottom == es->top)
524 /* Which error, the top of stack (latest one) or the first one? */
525 if (g == EV_PEEK_LAST)
528 i = (es->bottom + 1) % ERR_NUM_ERRORS;
530 ret = es->err_buffer[i];
533 es->err_buffer[i] = 0;
537 *file = es->err_file[i];
542 *line = es->err_line[i];
544 *func = es->err_func[i];
549 *flags = es->err_data_flags[i];
552 err_clear_data(es, i, 0);
555 *data = es->err_data[i];
565 void ERR_error_string_n(unsigned long e, char *buf, size_t len)
567 char lsbuf[64], rsbuf[64];
569 unsigned long f = 0, l, r;
575 ls = ERR_lib_error_string(e);
577 BIO_snprintf(lsbuf, sizeof(lsbuf), "lib(%lu)", l);
581 rs = ERR_reason_error_string(e);
582 r = ERR_GET_REASON(e);
584 BIO_snprintf(rsbuf, sizeof(rsbuf), "reason(%lu)", r);
588 BIO_snprintf(buf, len, "error:%08lX:%s:%s:%s", e, ls, "", rs);
589 if (strlen(buf) == len - 1) {
590 /* Didn't fit; use a minimal format. */
591 BIO_snprintf(buf, len, "err:%lx:%lx:%lx:%lx", e, l, f, r);
596 * ERR_error_string_n should be used instead for ret != NULL as
597 * ERR_error_string cannot know how large the buffer is
599 char *ERR_error_string(unsigned long e, char *ret)
601 static char buf[256];
605 ERR_error_string_n(e, ret, (int)sizeof(buf));
609 const char *ERR_lib_error_string(unsigned long e)
611 ERR_STRING_DATA d, *p;
614 if (!RUN_ONCE(&err_string_init, do_err_strings_init)) {
619 d.error = ERR_PACK(l, 0, 0);
620 p = int_err_get_item(&d);
621 return ((p == NULL) ? NULL : p->string);
625 const char *ERR_func_error_string(unsigned long e)
631 const char *ERR_reason_error_string(unsigned long e)
633 ERR_STRING_DATA d, *p = NULL;
636 if (!RUN_ONCE(&err_string_init, do_err_strings_init)) {
641 r = ERR_GET_REASON(e);
642 d.error = ERR_PACK(l, 0, r);
643 p = int_err_get_item(&d);
645 d.error = ERR_PACK(0, 0, r);
646 p = int_err_get_item(&d);
648 return ((p == NULL) ? NULL : p->string);
651 /* TODO(3.0): arg ignored for now */
652 static void err_delete_thread_state(void *arg)
654 ERR_STATE *state = CRYPTO_THREAD_get_local(&err_thread_local);
658 CRYPTO_THREAD_set_local(&err_thread_local, NULL);
659 ERR_STATE_free(state);
662 #if !OPENSSL_API_1_1_0
663 void ERR_remove_thread_state(void *dummy)
668 #if !OPENSSL_API_1_0_0
669 void ERR_remove_state(unsigned long pid)
674 DEFINE_RUN_ONCE_STATIC(err_do_init)
676 set_err_thread_local = 1;
677 return CRYPTO_THREAD_init_local(&err_thread_local, NULL);
680 ERR_STATE *err_get_state_int(void)
683 int saveerrno = get_last_sys_error();
685 if (!OPENSSL_init_crypto(OPENSSL_INIT_BASE_ONLY, NULL))
688 if (!RUN_ONCE(&err_init, err_do_init))
691 state = CRYPTO_THREAD_get_local(&err_thread_local);
692 if (state == (ERR_STATE*)-1)
696 if (!CRYPTO_THREAD_set_local(&err_thread_local, (ERR_STATE*)-1))
699 if ((state = OPENSSL_zalloc(sizeof(*state))) == NULL) {
700 CRYPTO_THREAD_set_local(&err_thread_local, NULL);
704 if (!ossl_init_thread_start(NULL, NULL, err_delete_thread_state)
705 || !CRYPTO_THREAD_set_local(&err_thread_local, state)) {
706 ERR_STATE_free(state);
707 CRYPTO_THREAD_set_local(&err_thread_local, NULL);
711 /* Ignore failures from these */
712 OPENSSL_init_crypto(OPENSSL_INIT_LOAD_CRYPTO_STRINGS, NULL);
715 set_sys_error(saveerrno);
720 ERR_STATE *ERR_get_state(void)
722 return err_get_state_int();
728 * err_shelve_state returns the current thread local error state
729 * and freezes the error module until err_unshelve_state is called.
731 int err_shelve_state(void **state)
733 int saveerrno = get_last_sys_error();
736 * Note, at present our only caller is OPENSSL_init_crypto(), indirectly
737 * via ossl_init_load_crypto_nodelete(), by which point the requested
738 * "base" initialization has already been performed, so the below call is a
739 * NOOP, that re-enters OPENSSL_init_crypto() only to quickly return.
741 * If are no other valid callers of this function, the call below can be
742 * removed, avoiding the re-entry into OPENSSL_init_crypto(). If there are
743 * potential uses that are not from inside OPENSSL_init_crypto(), then this
744 * call is needed, but some care is required to make sure that the re-entry
747 if (!OPENSSL_init_crypto(OPENSSL_INIT_BASE_ONLY, NULL))
750 if (!RUN_ONCE(&err_init, err_do_init))
753 *state = CRYPTO_THREAD_get_local(&err_thread_local);
754 if (!CRYPTO_THREAD_set_local(&err_thread_local, (ERR_STATE*)-1))
757 set_sys_error(saveerrno);
762 * err_unshelve_state restores the error state that was returned
763 * by err_shelve_state previously.
765 void err_unshelve_state(void* state)
767 if (state != (void*)-1)
768 CRYPTO_THREAD_set_local(&err_thread_local, (ERR_STATE*)state);
771 int ERR_get_next_error_library(void)
775 if (!RUN_ONCE(&err_string_init, do_err_strings_init))
778 CRYPTO_THREAD_write_lock(err_string_lock);
779 ret = int_err_library_number++;
780 CRYPTO_THREAD_unlock(err_string_lock);
784 static int err_set_error_data_int(char *data, size_t size, int flags,
789 es = err_get_state_int();
793 err_clear_data(es, es->top, deallocate);
794 err_set_data(es, es->top, data, size, flags);
799 void ERR_set_error_data(char *data, int flags)
802 * This function is void so we cannot propagate the error return. Since it
803 * is also in the public API we can't change the return type.
805 * We estimate the size of the data. If it's not flagged as allocated,
806 * then this is safe, and if it is flagged as allocated, then our size
807 * may be smaller than the actual allocation, but that doesn't matter
808 * too much, the buffer will remain untouched or will eventually be
809 * reallocated to a new size.
811 * callers should be advised that this function takes over ownership of
812 * the allocated memory, i.e. they can't count on the pointer to remain
815 err_set_error_data_int(data, strlen(data) + 1, flags, 1);
818 void ERR_add_error_data(int num, ...)
822 ERR_add_error_vdata(num, args);
826 void ERR_add_error_vdata(int num, va_list args)
829 int flags = ERR_TXT_MALLOCED | ERR_TXT_STRING;
833 /* Get the current error data; if an allocated string get it. */
834 es = err_get_state_int();
840 * If err_data is allocated already, re-use the space.
841 * Otherwise, allocate a small new buffer.
843 if ((es->err_data_flags[i] & flags) == flags) {
844 str = es->err_data[i];
845 size = es->err_data_size[i];
848 * To protect the string we just grabbed from tampering by other
849 * functions we may call, or to protect them from freeing a pointer
850 * that may no longer be valid at that point, we clear away the
851 * data pointer and the flags. We will set them again at the end
854 es->err_data[i] = NULL;
855 es->err_data_flags[i] = 0;
856 } else if ((str = OPENSSL_malloc(size = 81)) == NULL) {
864 arg = va_arg(args, char *);
872 p = OPENSSL_realloc(str, size);
879 OPENSSL_strlcat(str, arg, (size_t)size);
881 if (!err_set_error_data_int(str, size, flags, 0))
885 int ERR_set_mark(void)
889 es = err_get_state_int();
893 if (es->bottom == es->top)
895 es->err_flags[es->top] |= ERR_FLAG_MARK;
899 int ERR_pop_to_mark(void)
903 es = err_get_state_int();
907 while (es->bottom != es->top
908 && (es->err_flags[es->top] & ERR_FLAG_MARK) == 0) {
909 err_clear(es, es->top, 0);
910 es->top = es->top > 0 ? es->top - 1 : ERR_NUM_ERRORS - 1;
913 if (es->bottom == es->top)
915 es->err_flags[es->top] &= ~ERR_FLAG_MARK;
919 int ERR_clear_last_mark(void)
924 es = err_get_state_int();
929 while (es->bottom != top
930 && (es->err_flags[top] & ERR_FLAG_MARK) == 0) {
931 top = top > 0 ? top - 1 : ERR_NUM_ERRORS - 1;
934 if (es->bottom == top)
936 es->err_flags[top] &= ~ERR_FLAG_MARK;
940 void err_clear_last_constant_time(int clear)
945 es = err_get_state_int();
952 * Flag error as cleared but remove it elsewhere to avoid two errors
953 * accessing the same error stack location, revealing timing information.
955 clear = constant_time_select_int(constant_time_eq_int(clear, 0),
957 es->err_flags[top] |= clear;