2 * Copyright 1995-2020 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_KDF, 0, 0), "KDF routines"},
74 {ERR_PACK(ERR_LIB_OSSL_STORE, 0, 0), "STORE routines"},
75 {ERR_PACK(ERR_LIB_SM2, 0, 0), "SM2 routines"},
76 {ERR_PACK(ERR_LIB_ESS, 0, 0), "ESS routines"},
77 {ERR_PACK(ERR_LIB_PROV, 0, 0), "Provider routines"},
78 {ERR_PACK(ERR_LIB_OSSL_ENCODER, 0, 0), "ENCODER routines"},
79 {ERR_PACK(ERR_LIB_OSSL_DECODER, 0, 0), "DECODER routines"},
80 {ERR_PACK(ERR_LIB_HTTP, 0, 0), "HTTP routines"},
84 static ERR_STRING_DATA ERR_str_reasons[] = {
85 {ERR_R_SYS_LIB, "system lib"},
86 {ERR_R_BN_LIB, "BN lib"},
87 {ERR_R_RSA_LIB, "RSA lib"},
88 {ERR_R_DH_LIB, "DH lib"},
89 {ERR_R_EVP_LIB, "EVP lib"},
90 {ERR_R_BUF_LIB, "BUF lib"},
91 {ERR_R_OBJ_LIB, "OBJ lib"},
92 {ERR_R_PEM_LIB, "PEM lib"},
93 {ERR_R_DSA_LIB, "DSA lib"},
94 {ERR_R_X509_LIB, "X509 lib"},
95 {ERR_R_ASN1_LIB, "ASN1 lib"},
96 {ERR_R_EC_LIB, "EC lib"},
97 {ERR_R_BIO_LIB, "BIO lib"},
98 {ERR_R_PKCS7_LIB, "PKCS7 lib"},
99 {ERR_R_X509V3_LIB, "X509V3 lib"},
100 {ERR_R_ENGINE_LIB, "ENGINE lib"},
101 {ERR_R_UI_LIB, "UI lib"},
102 {ERR_R_OSSL_STORE_LIB, "STORE lib"},
103 {ERR_R_ECDSA_LIB, "ECDSA lib"},
105 {ERR_R_NESTED_ASN1_ERROR, "nested asn1 error"},
106 {ERR_R_MISSING_ASN1_EOS, "missing asn1 eos"},
108 {ERR_R_FATAL, "fatal"},
109 {ERR_R_MALLOC_FAILURE, "malloc failure"},
110 {ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED,
111 "called a function you should not call"},
112 {ERR_R_PASSED_NULL_PARAMETER, "passed a null parameter"},
113 {ERR_R_INTERNAL_ERROR, "internal error"},
114 {ERR_R_DISABLED, "called a function that was disabled at compile-time"},
115 {ERR_R_INIT_FAIL, "init fail"},
116 {ERR_R_OPERATION_FAIL, "operation fail"},
117 {ERR_R_INVALID_PROVIDER_FUNCTIONS, "invalid provider functions"},
118 {ERR_R_INTERRUPTED_OR_CANCELLED, "interrupted or cancelled"},
124 static CRYPTO_ONCE err_init = CRYPTO_ONCE_STATIC_INIT;
125 static int set_err_thread_local;
126 static CRYPTO_THREAD_LOCAL err_thread_local;
128 static CRYPTO_ONCE err_string_init = CRYPTO_ONCE_STATIC_INIT;
129 static CRYPTO_RWLOCK *err_string_lock;
131 static ERR_STRING_DATA *int_err_get_item(const ERR_STRING_DATA *);
137 static LHASH_OF(ERR_STRING_DATA) *int_error_hash = NULL;
138 static int int_err_library_number = ERR_LIB_USER;
140 typedef enum ERR_GET_ACTION_e {
141 EV_POP, EV_PEEK, EV_PEEK_LAST
144 static unsigned long get_error_values(ERR_GET_ACTION g,
145 const char **file, int *line,
146 const char **func, const char **data,
149 static unsigned long err_string_data_hash(const ERR_STRING_DATA *a)
151 unsigned long ret, l;
154 ret = l ^ ERR_GET_LIB(l);
155 return (ret ^ ret % 19 * 13);
158 static int err_string_data_cmp(const ERR_STRING_DATA *a,
159 const ERR_STRING_DATA *b)
161 if (a->error == b->error)
163 return a->error > b->error ? 1 : -1;
166 static ERR_STRING_DATA *int_err_get_item(const ERR_STRING_DATA *d)
168 ERR_STRING_DATA *p = NULL;
170 CRYPTO_THREAD_read_lock(err_string_lock);
171 p = lh_ERR_STRING_DATA_retrieve(int_error_hash, d);
172 CRYPTO_THREAD_unlock(err_string_lock);
177 static void ERR_STATE_free(ERR_STATE *s)
183 for (i = 0; i < ERR_NUM_ERRORS; i++) {
184 err_clear_data(s, i, 1);
189 DEFINE_RUN_ONCE_STATIC(do_err_strings_init)
191 if (!OPENSSL_init_crypto(0, NULL))
193 err_string_lock = CRYPTO_THREAD_lock_new();
194 if (err_string_lock == NULL)
196 int_error_hash = lh_ERR_STRING_DATA_new(err_string_data_hash,
197 err_string_data_cmp);
198 if (int_error_hash == NULL) {
199 CRYPTO_THREAD_lock_free(err_string_lock);
200 err_string_lock = NULL;
206 void err_cleanup(void)
208 if (set_err_thread_local != 0)
209 CRYPTO_THREAD_cleanup_local(&err_thread_local);
210 CRYPTO_THREAD_lock_free(err_string_lock);
211 err_string_lock = NULL;
212 lh_ERR_STRING_DATA_free(int_error_hash);
213 int_error_hash = NULL;
217 * Legacy; pack in the library.
219 static void err_patch(int lib, ERR_STRING_DATA *str)
221 unsigned long plib = ERR_PACK(lib, 0, 0);
223 for (; str->error != 0; str++)
228 * Hash in |str| error strings. Assumes the RUN_ONCE was done.
230 static int err_load_strings(const ERR_STRING_DATA *str)
232 CRYPTO_THREAD_write_lock(err_string_lock);
233 for (; str->error; str++)
234 (void)lh_ERR_STRING_DATA_insert(int_error_hash,
235 (ERR_STRING_DATA *)str);
236 CRYPTO_THREAD_unlock(err_string_lock);
240 int err_load_ERR_strings_int(void)
242 #ifndef OPENSSL_NO_ERR
243 if (!RUN_ONCE(&err_string_init, do_err_strings_init))
246 err_load_strings(ERR_str_libraries);
247 err_load_strings(ERR_str_reasons);
252 int ERR_load_strings(int lib, ERR_STRING_DATA *str)
254 if (err_load_ERR_strings_int() == 0)
258 err_load_strings(str);
262 int ERR_load_strings_const(const ERR_STRING_DATA *str)
264 if (err_load_ERR_strings_int() == 0)
266 err_load_strings(str);
270 int ERR_unload_strings(int lib, ERR_STRING_DATA *str)
272 if (!RUN_ONCE(&err_string_init, do_err_strings_init))
275 CRYPTO_THREAD_write_lock(err_string_lock);
277 * We don't need to ERR_PACK the lib, since that was done (to
278 * the table) when it was loaded.
280 for (; str->error; str++)
281 (void)lh_ERR_STRING_DATA_delete(int_error_hash, str);
282 CRYPTO_THREAD_unlock(err_string_lock);
287 void err_free_strings_int(void)
289 if (!RUN_ONCE(&err_string_init, do_err_strings_init))
293 /********************************************************/
295 void ERR_clear_error(void)
300 es = err_get_state_int();
304 for (i = 0; i < ERR_NUM_ERRORS; i++) {
307 es->top = es->bottom = 0;
310 unsigned long ERR_get_error(void)
312 return get_error_values(EV_POP, NULL, NULL, NULL, NULL, NULL);
315 unsigned long ERR_get_error_all(const char **file, int *line,
317 const char **data, int *flags)
319 return get_error_values(EV_POP, file, line, func, data, flags);
322 #ifndef OPENSSL_NO_DEPRECATED_3_0
323 unsigned long ERR_get_error_line(const char **file, int *line)
325 return get_error_values(EV_POP, file, line, NULL, NULL, NULL);
328 unsigned long ERR_get_error_line_data(const char **file, int *line,
329 const char **data, int *flags)
331 return get_error_values(EV_POP, file, line, NULL, data, flags);
335 unsigned long ERR_peek_error(void)
337 return get_error_values(EV_PEEK, NULL, NULL, NULL, NULL, NULL);
340 unsigned long ERR_peek_error_line(const char **file, int *line)
342 return get_error_values(EV_PEEK, file, line, NULL, NULL, NULL);
345 unsigned long ERR_peek_error_func(const char **func)
347 return get_error_values(EV_PEEK, NULL, NULL, func, NULL, NULL);
350 unsigned long ERR_peek_error_data(const char **data, int *flags)
352 return get_error_values(EV_PEEK, NULL, NULL, NULL, data, flags);
355 unsigned long ERR_peek_error_all(const char **file, int *line,
357 const char **data, int *flags)
359 return get_error_values(EV_PEEK, file, line, func, data, flags);
362 #ifndef OPENSSL_NO_DEPRECATED_3_0
363 unsigned long ERR_peek_error_line_data(const char **file, int *line,
364 const char **data, int *flags)
366 return get_error_values(EV_PEEK, file, line, NULL, data, flags);
370 unsigned long ERR_peek_last_error(void)
372 return get_error_values(EV_PEEK_LAST, NULL, NULL, NULL, NULL, NULL);
375 unsigned long ERR_peek_last_error_line(const char **file, int *line)
377 return get_error_values(EV_PEEK_LAST, file, line, NULL, NULL, NULL);
380 unsigned long ERR_peek_last_error_func(const char **func)
382 return get_error_values(EV_PEEK_LAST, NULL, NULL, func, NULL, NULL);
385 unsigned long ERR_peek_last_error_data(const char **data, int *flags)
387 return get_error_values(EV_PEEK_LAST, NULL, NULL, NULL, data, flags);
390 unsigned long ERR_peek_last_error_all(const char **file, int *line,
392 const char **data, int *flags)
394 return get_error_values(EV_PEEK_LAST, file, line, func, data, flags);
397 #ifndef OPENSSL_NO_DEPRECATED_3_0
398 unsigned long ERR_peek_last_error_line_data(const char **file, int *line,
399 const char **data, int *flags)
401 return get_error_values(EV_PEEK_LAST, file, line, NULL, data, flags);
405 static unsigned long get_error_values(ERR_GET_ACTION g,
406 const char **file, int *line,
408 const char **data, int *flags)
414 es = err_get_state_int();
419 * Clear anything that should have been cleared earlier. We do this
420 * here because this doesn't have constant-time issues.
422 while (es->bottom != es->top) {
423 if (es->err_flags[es->top] & ERR_FLAG_CLEAR) {
424 err_clear(es, es->top, 0);
425 es->top = es->top > 0 ? es->top - 1 : ERR_NUM_ERRORS - 1;
428 i = (es->bottom + 1) % ERR_NUM_ERRORS;
429 if (es->err_flags[i] & ERR_FLAG_CLEAR) {
431 err_clear(es, es->bottom, 0);
437 /* If everything has been cleared, the stack is empty. */
438 if (es->bottom == es->top)
441 /* Which error, the top of stack (latest one) or the first one? */
442 if (g == EV_PEEK_LAST)
445 i = (es->bottom + 1) % ERR_NUM_ERRORS;
447 ret = es->err_buffer[i];
450 es->err_buffer[i] = 0;
454 *file = es->err_file[i];
459 *line = es->err_line[i];
461 *func = es->err_func[i];
466 *flags = es->err_data_flags[i];
469 err_clear_data(es, i, 0);
472 *data = es->err_data[i];
482 void ossl_err_string_int(unsigned long e, const char *func,
483 char *buf, size_t len)
485 char lsbuf[64], rsbuf[256];
486 const char *ls, *rs = NULL;
493 ls = ERR_lib_error_string(e);
495 BIO_snprintf(lsbuf, sizeof(lsbuf), "lib(%lu)", l);
500 * ERR_reason_error_string() can't safely return system error strings,
501 * since it would call openssl_strerror_r(), which needs a buffer for
502 * thread safety. So for system errors, we call openssl_strerror_r()
505 r = ERR_GET_REASON(e);
506 #ifndef OPENSSL_NO_ERR
507 if (ERR_SYSTEM_ERROR(e)) {
508 if (openssl_strerror_r(r, rsbuf, sizeof(rsbuf)))
511 rs = ERR_reason_error_string(e);
515 BIO_snprintf(rsbuf, sizeof(rsbuf), "reason(%lu)", r);
519 BIO_snprintf(buf, len, "error:%08lX:%s:%s:%s", e, ls, func, rs);
520 if (strlen(buf) == len - 1) {
521 /* Didn't fit; use a minimal format. */
522 BIO_snprintf(buf, len, "err:%lx:%lx:%lx:%lx", e, l, 0L, r);
527 void ERR_error_string_n(unsigned long e, char *buf, size_t len)
529 ossl_err_string_int(e, "", buf, len);
533 * ERR_error_string_n should be used instead for ret != NULL as
534 * ERR_error_string cannot know how large the buffer is
536 char *ERR_error_string(unsigned long e, char *ret)
538 static char buf[256];
542 ERR_error_string_n(e, ret, (int)sizeof(buf));
546 const char *ERR_lib_error_string(unsigned long e)
548 ERR_STRING_DATA d, *p;
551 if (!RUN_ONCE(&err_string_init, do_err_strings_init)) {
556 d.error = ERR_PACK(l, 0, 0);
557 p = int_err_get_item(&d);
558 return ((p == NULL) ? NULL : p->string);
561 #ifndef OPENSSL_NO_DEPRECATED_3_0
562 const char *ERR_func_error_string(unsigned long e)
568 const char *ERR_reason_error_string(unsigned long e)
570 ERR_STRING_DATA d, *p = NULL;
573 if (!RUN_ONCE(&err_string_init, do_err_strings_init)) {
578 * ERR_reason_error_string() can't safely return system error strings,
579 * since openssl_strerror_r() needs a buffer for thread safety, and we
580 * haven't got one that would serve any sensible purpose.
582 if (ERR_SYSTEM_ERROR(e))
586 r = ERR_GET_REASON(e);
587 d.error = ERR_PACK(l, 0, r);
588 p = int_err_get_item(&d);
590 d.error = ERR_PACK(0, 0, r);
591 p = int_err_get_item(&d);
593 return ((p == NULL) ? NULL : p->string);
596 static void err_delete_thread_state(void *unused)
598 ERR_STATE *state = CRYPTO_THREAD_get_local(&err_thread_local);
602 CRYPTO_THREAD_set_local(&err_thread_local, NULL);
603 ERR_STATE_free(state);
606 #ifndef OPENSSL_NO_DEPRECATED_1_1_0
607 void ERR_remove_thread_state(void *dummy)
612 #ifndef OPENSSL_NO_DEPRECATED_1_0_0
613 void ERR_remove_state(unsigned long pid)
618 DEFINE_RUN_ONCE_STATIC(err_do_init)
620 set_err_thread_local = 1;
621 return CRYPTO_THREAD_init_local(&err_thread_local, NULL);
624 ERR_STATE *err_get_state_int(void)
627 int saveerrno = get_last_sys_error();
629 if (!OPENSSL_init_crypto(OPENSSL_INIT_BASE_ONLY, NULL))
632 if (!RUN_ONCE(&err_init, err_do_init))
635 state = CRYPTO_THREAD_get_local(&err_thread_local);
636 if (state == (ERR_STATE*)-1)
640 if (!CRYPTO_THREAD_set_local(&err_thread_local, (ERR_STATE*)-1))
643 if ((state = OPENSSL_zalloc(sizeof(*state))) == NULL) {
644 CRYPTO_THREAD_set_local(&err_thread_local, NULL);
648 if (!ossl_init_thread_start(NULL, NULL, err_delete_thread_state)
649 || !CRYPTO_THREAD_set_local(&err_thread_local, state)) {
650 ERR_STATE_free(state);
651 CRYPTO_THREAD_set_local(&err_thread_local, NULL);
655 /* Ignore failures from these */
656 OPENSSL_init_crypto(OPENSSL_INIT_LOAD_CRYPTO_STRINGS, NULL);
659 set_sys_error(saveerrno);
663 #ifndef OPENSSL_NO_DEPRECATED_3_0
664 ERR_STATE *ERR_get_state(void)
666 return err_get_state_int();
672 * err_shelve_state returns the current thread local error state
673 * and freezes the error module until err_unshelve_state is called.
675 int err_shelve_state(void **state)
677 int saveerrno = get_last_sys_error();
680 * Note, at present our only caller is OPENSSL_init_crypto(), indirectly
681 * via ossl_init_load_crypto_nodelete(), by which point the requested
682 * "base" initialization has already been performed, so the below call is a
683 * NOOP, that re-enters OPENSSL_init_crypto() only to quickly return.
685 * If are no other valid callers of this function, the call below can be
686 * removed, avoiding the re-entry into OPENSSL_init_crypto(). If there are
687 * potential uses that are not from inside OPENSSL_init_crypto(), then this
688 * call is needed, but some care is required to make sure that the re-entry
691 if (!OPENSSL_init_crypto(OPENSSL_INIT_BASE_ONLY, NULL))
694 if (!RUN_ONCE(&err_init, err_do_init))
697 *state = CRYPTO_THREAD_get_local(&err_thread_local);
698 if (!CRYPTO_THREAD_set_local(&err_thread_local, (ERR_STATE*)-1))
701 set_sys_error(saveerrno);
706 * err_unshelve_state restores the error state that was returned
707 * by err_shelve_state previously.
709 void err_unshelve_state(void* state)
711 if (state != (void*)-1)
712 CRYPTO_THREAD_set_local(&err_thread_local, (ERR_STATE*)state);
715 int ERR_get_next_error_library(void)
719 if (!RUN_ONCE(&err_string_init, do_err_strings_init))
722 CRYPTO_THREAD_write_lock(err_string_lock);
723 ret = int_err_library_number++;
724 CRYPTO_THREAD_unlock(err_string_lock);
728 static int err_set_error_data_int(char *data, size_t size, int flags,
733 es = err_get_state_int();
737 err_clear_data(es, es->top, deallocate);
738 err_set_data(es, es->top, data, size, flags);
743 void ERR_set_error_data(char *data, int flags)
746 * This function is void so we cannot propagate the error return. Since it
747 * is also in the public API we can't change the return type.
749 * We estimate the size of the data. If it's not flagged as allocated,
750 * then this is safe, and if it is flagged as allocated, then our size
751 * may be smaller than the actual allocation, but that doesn't matter
752 * too much, the buffer will remain untouched or will eventually be
753 * reallocated to a new size.
755 * callers should be advised that this function takes over ownership of
756 * the allocated memory, i.e. they can't count on the pointer to remain
759 err_set_error_data_int(data, strlen(data) + 1, flags, 1);
762 void ERR_add_error_data(int num, ...)
766 ERR_add_error_vdata(num, args);
770 void ERR_add_error_vdata(int num, va_list args)
773 int flags = ERR_TXT_MALLOCED | ERR_TXT_STRING;
777 /* Get the current error data; if an allocated string get it. */
778 es = err_get_state_int();
784 * If err_data is allocated already, re-use the space.
785 * Otherwise, allocate a small new buffer.
787 if ((es->err_data_flags[i] & flags) == flags) {
788 str = es->err_data[i];
789 size = es->err_data_size[i];
792 * To protect the string we just grabbed from tampering by other
793 * functions we may call, or to protect them from freeing a pointer
794 * that may no longer be valid at that point, we clear away the
795 * data pointer and the flags. We will set them again at the end
798 es->err_data[i] = NULL;
799 es->err_data_flags[i] = 0;
800 } else if ((str = OPENSSL_malloc(size = 81)) == NULL) {
808 arg = va_arg(args, char *);
816 p = OPENSSL_realloc(str, size);
823 OPENSSL_strlcat(str, arg, (size_t)size);
825 if (!err_set_error_data_int(str, size, flags, 0))
829 int ERR_set_mark(void)
833 es = err_get_state_int();
837 if (es->bottom == es->top)
839 es->err_marks[es->top]++;
843 int ERR_pop_to_mark(void)
847 es = err_get_state_int();
851 while (es->bottom != es->top
852 && es->err_marks[es->top] == 0) {
853 err_clear(es, es->top, 0);
854 es->top = es->top > 0 ? es->top - 1 : ERR_NUM_ERRORS - 1;
857 if (es->bottom == es->top)
859 es->err_marks[es->top]--;
863 int ERR_clear_last_mark(void)
868 es = err_get_state_int();
873 while (es->bottom != top
874 && es->err_marks[top] == 0) {
875 top = top > 0 ? top - 1 : ERR_NUM_ERRORS - 1;
878 if (es->bottom == top)
880 es->err_marks[top]--;
884 void err_clear_last_constant_time(int clear)
889 es = err_get_state_int();
896 * Flag error as cleared but remove it elsewhere to avoid two errors
897 * accessing the same error stack location, revealing timing information.
899 clear = constant_time_select_int(constant_time_eq_int(clear, 0),
901 es->err_flags[top] |= clear;