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
13 #include "internal/cryptlib_int.h"
14 #include "internal/err.h"
15 #include "internal/err_int.h"
16 #include <openssl/err.h>
17 #include <openssl/crypto.h>
18 #include <openssl/buffer.h>
19 #include <openssl/bio.h>
20 #include <openssl/opensslconf.h>
21 #include "internal/thread_once.h"
22 #include "internal/ctype.h"
23 #include "internal/constant_time_locl.h"
26 static int err_load_strings(const ERR_STRING_DATA *str);
28 static void ERR_STATE_free(ERR_STATE *s);
29 #ifndef OPENSSL_NO_ERR
30 static ERR_STRING_DATA ERR_str_libraries[] = {
31 {ERR_PACK(ERR_LIB_NONE, 0, 0), "unknown library"},
32 {ERR_PACK(ERR_LIB_SYS, 0, 0), "system library"},
33 {ERR_PACK(ERR_LIB_BN, 0, 0), "bignum routines"},
34 {ERR_PACK(ERR_LIB_RSA, 0, 0), "rsa routines"},
35 {ERR_PACK(ERR_LIB_DH, 0, 0), "Diffie-Hellman routines"},
36 {ERR_PACK(ERR_LIB_EVP, 0, 0), "digital envelope routines"},
37 {ERR_PACK(ERR_LIB_BUF, 0, 0), "memory buffer routines"},
38 {ERR_PACK(ERR_LIB_OBJ, 0, 0), "object identifier routines"},
39 {ERR_PACK(ERR_LIB_PEM, 0, 0), "PEM routines"},
40 {ERR_PACK(ERR_LIB_DSA, 0, 0), "dsa routines"},
41 {ERR_PACK(ERR_LIB_X509, 0, 0), "x509 certificate routines"},
42 {ERR_PACK(ERR_LIB_ASN1, 0, 0), "asn1 encoding routines"},
43 {ERR_PACK(ERR_LIB_CONF, 0, 0), "configuration file routines"},
44 {ERR_PACK(ERR_LIB_CRYPTO, 0, 0), "common libcrypto routines"},
45 {ERR_PACK(ERR_LIB_EC, 0, 0), "elliptic curve routines"},
46 {ERR_PACK(ERR_LIB_ECDSA, 0, 0), "ECDSA routines"},
47 {ERR_PACK(ERR_LIB_ECDH, 0, 0), "ECDH routines"},
48 {ERR_PACK(ERR_LIB_SSL, 0, 0), "SSL routines"},
49 {ERR_PACK(ERR_LIB_BIO, 0, 0), "BIO routines"},
50 {ERR_PACK(ERR_LIB_PKCS7, 0, 0), "PKCS7 routines"},
51 {ERR_PACK(ERR_LIB_X509V3, 0, 0), "X509 V3 routines"},
52 {ERR_PACK(ERR_LIB_PKCS12, 0, 0), "PKCS12 routines"},
53 {ERR_PACK(ERR_LIB_RAND, 0, 0), "random number generator"},
54 {ERR_PACK(ERR_LIB_DSO, 0, 0), "DSO support routines"},
55 {ERR_PACK(ERR_LIB_TS, 0, 0), "time stamp routines"},
56 {ERR_PACK(ERR_LIB_ENGINE, 0, 0), "engine routines"},
57 {ERR_PACK(ERR_LIB_OCSP, 0, 0), "OCSP routines"},
58 {ERR_PACK(ERR_LIB_UI, 0, 0), "UI routines"},
59 {ERR_PACK(ERR_LIB_FIPS, 0, 0), "FIPS routines"},
60 {ERR_PACK(ERR_LIB_CMS, 0, 0), "CMS routines"},
61 {ERR_PACK(ERR_LIB_CRMF, 0, 0), "CRMF routines"},
62 {ERR_PACK(ERR_LIB_CMP, 0, 0), "CMP routines"},
63 {ERR_PACK(ERR_LIB_HMAC, 0, 0), "HMAC routines"},
64 {ERR_PACK(ERR_LIB_CT, 0, 0), "CT routines"},
65 {ERR_PACK(ERR_LIB_ASYNC, 0, 0), "ASYNC routines"},
66 {ERR_PACK(ERR_LIB_KDF, 0, 0), "KDF routines"},
67 {ERR_PACK(ERR_LIB_OSSL_STORE, 0, 0), "STORE routines"},
68 {ERR_PACK(ERR_LIB_SM2, 0, 0), "SM2 routines"},
69 {ERR_PACK(ERR_LIB_ESS, 0, 0), "ESS routines"},
70 {ERR_PACK(ERR_LIB_PROV, 0, 0), "Provider routines"},
74 static ERR_STRING_DATA ERR_str_reasons[] = {
75 {ERR_R_SYS_LIB, "system lib"},
76 {ERR_R_BN_LIB, "BN lib"},
77 {ERR_R_RSA_LIB, "RSA lib"},
78 {ERR_R_DH_LIB, "DH lib"},
79 {ERR_R_EVP_LIB, "EVP lib"},
80 {ERR_R_BUF_LIB, "BUF lib"},
81 {ERR_R_OBJ_LIB, "OBJ lib"},
82 {ERR_R_PEM_LIB, "PEM lib"},
83 {ERR_R_DSA_LIB, "DSA lib"},
84 {ERR_R_X509_LIB, "X509 lib"},
85 {ERR_R_ASN1_LIB, "ASN1 lib"},
86 {ERR_R_EC_LIB, "EC lib"},
87 {ERR_R_BIO_LIB, "BIO lib"},
88 {ERR_R_PKCS7_LIB, "PKCS7 lib"},
89 {ERR_R_X509V3_LIB, "X509V3 lib"},
90 {ERR_R_ENGINE_LIB, "ENGINE lib"},
91 {ERR_R_UI_LIB, "UI lib"},
92 {ERR_R_OSSL_STORE_LIB, "STORE lib"},
93 {ERR_R_ECDSA_LIB, "ECDSA lib"},
95 {ERR_R_NESTED_ASN1_ERROR, "nested asn1 error"},
96 {ERR_R_MISSING_ASN1_EOS, "missing asn1 eos"},
98 {ERR_R_FATAL, "fatal"},
99 {ERR_R_MALLOC_FAILURE, "malloc failure"},
100 {ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED,
101 "called a function you should not call"},
102 {ERR_R_PASSED_NULL_PARAMETER, "passed a null parameter"},
103 {ERR_R_INTERNAL_ERROR, "internal error"},
104 {ERR_R_DISABLED, "called a function that was disabled at compile-time"},
105 {ERR_R_INIT_FAIL, "init fail"},
106 {ERR_R_OPERATION_FAIL, "operation fail"},
112 static CRYPTO_ONCE err_init = CRYPTO_ONCE_STATIC_INIT;
113 static int set_err_thread_local;
114 static CRYPTO_THREAD_LOCAL err_thread_local;
116 static CRYPTO_ONCE err_string_init = CRYPTO_ONCE_STATIC_INIT;
117 static CRYPTO_RWLOCK *err_string_lock;
119 static ERR_STRING_DATA *int_err_get_item(const ERR_STRING_DATA *);
125 static LHASH_OF(ERR_STRING_DATA) *int_error_hash = NULL;
126 static int int_err_library_number = ERR_LIB_USER;
128 static unsigned long get_error_values(int inc, int top, const char **file,
129 int *line, const char **data,
132 static unsigned long err_string_data_hash(const ERR_STRING_DATA *a)
134 unsigned long ret, l;
137 ret = l ^ ERR_GET_LIB(l);
138 return (ret ^ ret % 19 * 13);
141 static int err_string_data_cmp(const ERR_STRING_DATA *a,
142 const ERR_STRING_DATA *b)
144 if (a->error == b->error)
146 return a->error > b->error ? 1 : -1;
149 static ERR_STRING_DATA *int_err_get_item(const ERR_STRING_DATA *d)
151 ERR_STRING_DATA *p = NULL;
153 CRYPTO_THREAD_read_lock(err_string_lock);
154 p = lh_ERR_STRING_DATA_retrieve(int_error_hash, d);
155 CRYPTO_THREAD_unlock(err_string_lock);
160 #ifndef OPENSSL_NO_ERR
161 /* 2019-05-21: Russian and Ukrainian locales on Linux require more than 6,5 kB */
162 # define SPACE_SYS_STR_REASONS 8 * 1024
163 # define NUM_SYS_STR_REASONS 127
165 static ERR_STRING_DATA SYS_str_reasons[NUM_SYS_STR_REASONS + 1];
167 * SYS_str_reasons is filled with copies of strerror() results at
168 * initialization. 'errno' values up to 127 should cover all usual errors,
169 * others will be displayed numerically by ERR_error_string. It is crucial
170 * that we have something for each reason code that occurs in
171 * ERR_str_reasons, or bogus reason strings will be returned for SYSerr(),
172 * which always gets an errno value and never one of those 'standard' reason
176 static void build_SYS_str_reasons(void)
178 /* OPENSSL_malloc cannot be used here, use static storage instead */
179 static char strerror_pool[SPACE_SYS_STR_REASONS];
180 char *cur = strerror_pool;
184 int saveerrno = get_last_sys_error();
186 CRYPTO_THREAD_write_lock(err_string_lock);
188 CRYPTO_THREAD_unlock(err_string_lock);
192 for (i = 1; i <= NUM_SYS_STR_REASONS; i++) {
193 ERR_STRING_DATA *str = &SYS_str_reasons[i - 1];
195 str->error = ERR_PACK(ERR_LIB_SYS, 0, i);
197 * If we have used up all the space in strerror_pool,
198 * there's no point in calling openssl_strerror_r()
200 if (str->string == NULL && cnt < sizeof(strerror_pool)) {
201 if (openssl_strerror_r(i, cur, sizeof(strerror_pool) - cnt)) {
202 size_t l = strlen(cur);
209 * VMS has an unusual quirk of adding spaces at the end of
210 * some (most? all?) messages. Lets trim them off.
212 while (cur > strerror_pool && ossl_isspace(cur[-1])) {
220 if (str->string == NULL)
221 str->string = "unknown";
225 * Now we still have SYS_str_reasons[NUM_SYS_STR_REASONS] = {0, NULL}, as
226 * required by ERR_load_strings.
231 CRYPTO_THREAD_unlock(err_string_lock);
232 /* openssl_strerror_r could change errno, but we want to preserve it */
233 set_sys_error(saveerrno);
234 err_load_strings(SYS_str_reasons);
238 #define err_clear_data(p, i) \
240 if ((p)->err_data_flags[i] & ERR_TXT_MALLOCED) {\
241 OPENSSL_free((p)->err_data[i]); \
242 (p)->err_data[i] = NULL; \
244 (p)->err_data_flags[i] = 0; \
247 #define err_clear(p, i) \
249 err_clear_data(p, i); \
250 (p)->err_flags[i] = 0; \
251 (p)->err_buffer[i] = 0; \
252 (p)->err_file[i] = NULL; \
253 (p)->err_line[i] = -1; \
256 static void ERR_STATE_free(ERR_STATE *s)
262 for (i = 0; i < ERR_NUM_ERRORS; i++) {
263 err_clear_data(s, i);
268 DEFINE_RUN_ONCE_STATIC(do_err_strings_init)
270 if (!OPENSSL_init_crypto(0, NULL))
272 err_string_lock = CRYPTO_THREAD_lock_new();
273 if (err_string_lock == NULL)
275 int_error_hash = lh_ERR_STRING_DATA_new(err_string_data_hash,
276 err_string_data_cmp);
277 if (int_error_hash == NULL) {
278 CRYPTO_THREAD_lock_free(err_string_lock);
279 err_string_lock = NULL;
285 void err_cleanup(void)
287 if (set_err_thread_local != 0)
288 CRYPTO_THREAD_cleanup_local(&err_thread_local);
289 CRYPTO_THREAD_lock_free(err_string_lock);
290 err_string_lock = NULL;
291 lh_ERR_STRING_DATA_free(int_error_hash);
292 int_error_hash = NULL;
296 * Legacy; pack in the library.
298 static void err_patch(int lib, ERR_STRING_DATA *str)
300 unsigned long plib = ERR_PACK(lib, 0, 0);
302 for (; str->error != 0; str++)
307 * Hash in |str| error strings. Assumes the URN_ONCE was done.
309 static int err_load_strings(const ERR_STRING_DATA *str)
311 CRYPTO_THREAD_write_lock(err_string_lock);
312 for (; str->error; str++)
313 (void)lh_ERR_STRING_DATA_insert(int_error_hash,
314 (ERR_STRING_DATA *)str);
315 CRYPTO_THREAD_unlock(err_string_lock);
319 int ERR_load_ERR_strings(void)
321 #ifndef OPENSSL_NO_ERR
322 if (!RUN_ONCE(&err_string_init, do_err_strings_init))
325 err_load_strings(ERR_str_libraries);
326 err_load_strings(ERR_str_reasons);
327 build_SYS_str_reasons();
332 int ERR_load_strings(int lib, ERR_STRING_DATA *str)
334 if (ERR_load_ERR_strings() == 0)
338 err_load_strings(str);
342 int ERR_load_strings_const(const ERR_STRING_DATA *str)
344 if (ERR_load_ERR_strings() == 0)
346 err_load_strings(str);
350 int ERR_unload_strings(int lib, ERR_STRING_DATA *str)
352 if (!RUN_ONCE(&err_string_init, do_err_strings_init))
355 CRYPTO_THREAD_write_lock(err_string_lock);
357 * We don't need to ERR_PACK the lib, since that was done (to
358 * the table) when it was loaded.
360 for (; str->error; str++)
361 (void)lh_ERR_STRING_DATA_delete(int_error_hash, str);
362 CRYPTO_THREAD_unlock(err_string_lock);
367 void err_free_strings_int(void)
369 if (!RUN_ONCE(&err_string_init, do_err_strings_init))
373 /********************************************************/
375 void ERR_put_error(int lib, int func, int reason, const char *file, int line)
381 * In the BS2000-OSD POSIX subsystem, the compiler generates path names
382 * in the form "*POSIX(/etc/passwd)". This dirty hack strips them to
383 * something sensible. @@@ We shouldn't modify a const string, though.
385 if (strncmp(file, "*POSIX(", sizeof("*POSIX(") - 1) == 0) {
388 /* Skip the "*POSIX(" prefix */
389 file += sizeof("*POSIX(") - 1;
390 end = &file[strlen(file) - 1];
393 /* Optional: use the basename of the path only. */
394 if ((end = strrchr(file, '/')) != NULL)
398 es = ERR_get_state();
402 es->top = (es->top + 1) % ERR_NUM_ERRORS;
403 if (es->top == es->bottom)
404 es->bottom = (es->bottom + 1) % ERR_NUM_ERRORS;
405 es->err_flags[es->top] = 0;
406 es->err_buffer[es->top] = ERR_PACK(lib, func, reason);
407 es->err_file[es->top] = file;
408 es->err_line[es->top] = line;
409 err_clear_data(es, es->top);
412 void ERR_clear_error(void)
417 es = ERR_get_state();
421 for (i = 0; i < ERR_NUM_ERRORS; i++) {
424 es->top = es->bottom = 0;
427 unsigned long ERR_get_error(void)
429 return get_error_values(1, 0, NULL, NULL, NULL, NULL);
432 unsigned long ERR_get_error_line(const char **file, int *line)
434 return get_error_values(1, 0, file, line, NULL, NULL);
437 unsigned long ERR_get_error_line_data(const char **file, int *line,
438 const char **data, int *flags)
440 return get_error_values(1, 0, file, line, data, flags);
443 unsigned long ERR_peek_error(void)
445 return get_error_values(0, 0, NULL, NULL, NULL, NULL);
448 unsigned long ERR_peek_error_line(const char **file, int *line)
450 return get_error_values(0, 0, file, line, NULL, NULL);
453 unsigned long ERR_peek_error_line_data(const char **file, int *line,
454 const char **data, int *flags)
456 return get_error_values(0, 0, file, line, data, flags);
459 unsigned long ERR_peek_last_error(void)
461 return get_error_values(0, 1, NULL, NULL, NULL, NULL);
464 unsigned long ERR_peek_last_error_line(const char **file, int *line)
466 return get_error_values(0, 1, file, line, NULL, NULL);
469 unsigned long ERR_peek_last_error_line_data(const char **file, int *line,
470 const char **data, int *flags)
472 return get_error_values(0, 1, file, line, data, flags);
475 static unsigned long get_error_values(int inc, int top, const char **file,
476 int *line, const char **data,
483 es = ERR_get_state();
497 return ERR_R_INTERNAL_ERROR;
500 while (es->bottom != es->top) {
501 if (es->err_flags[es->top] & ERR_FLAG_CLEAR) {
502 err_clear(es, es->top);
503 es->top = es->top > 0 ? es->top - 1 : ERR_NUM_ERRORS - 1;
506 i = (es->bottom + 1) % ERR_NUM_ERRORS;
507 if (es->err_flags[i] & ERR_FLAG_CLEAR) {
509 err_clear(es, es->bottom);
515 if (es->bottom == es->top)
519 i = es->top; /* last error */
521 i = (es->bottom + 1) % ERR_NUM_ERRORS; /* first error */
523 ret = es->err_buffer[i];
526 es->err_buffer[i] = 0;
529 if (file != NULL && line != NULL) {
530 if (es->err_file[i] == NULL) {
534 *file = es->err_file[i];
535 *line = es->err_line[i];
541 err_clear_data(es, i);
544 if (es->err_data[i] == NULL) {
549 *data = es->err_data[i];
551 *flags = es->err_data_flags[i];
557 void ERR_error_string_n(unsigned long e, char *buf, size_t len)
559 char lsbuf[64], rsbuf[64];
561 unsigned long f = 0, l, r;
567 ls = ERR_lib_error_string(e);
569 BIO_snprintf(lsbuf, sizeof(lsbuf), "lib(%lu)", l);
573 rs = ERR_reason_error_string(e);
574 r = ERR_GET_REASON(e);
576 BIO_snprintf(rsbuf, sizeof(rsbuf), "reason(%lu)", r);
580 BIO_snprintf(buf, len, "error:%08lX:%s:%s:%s", e, ls, "", rs);
581 if (strlen(buf) == len - 1) {
582 /* Didn't fit; use a minimal format. */
583 BIO_snprintf(buf, len, "err:%lx:%lx:%lx:%lx", e, l, f, r);
588 * ERR_error_string_n should be used instead for ret != NULL as
589 * ERR_error_string cannot know how large the buffer is
591 char *ERR_error_string(unsigned long e, char *ret)
593 static char buf[256];
597 ERR_error_string_n(e, ret, (int)sizeof(buf));
601 const char *ERR_lib_error_string(unsigned long e)
603 ERR_STRING_DATA d, *p;
606 if (!RUN_ONCE(&err_string_init, do_err_strings_init)) {
611 d.error = ERR_PACK(l, 0, 0);
612 p = int_err_get_item(&d);
613 return ((p == NULL) ? NULL : p->string);
616 const char *ERR_func_error_string(unsigned long e)
618 if (!RUN_ONCE(&err_string_init, do_err_strings_init))
620 return ERR_GET_LIB(e) == ERR_LIB_SYS ? "system library" : NULL;
623 const char *ERR_reason_error_string(unsigned long e)
625 ERR_STRING_DATA d, *p = NULL;
628 if (!RUN_ONCE(&err_string_init, do_err_strings_init)) {
633 r = ERR_GET_REASON(e);
634 d.error = ERR_PACK(l, 0, r);
635 p = int_err_get_item(&d);
637 d.error = ERR_PACK(0, 0, r);
638 p = int_err_get_item(&d);
640 return ((p == NULL) ? NULL : p->string);
643 /* TODO(3.0): arg ignored for now */
644 static void err_delete_thread_state(void *arg)
646 ERR_STATE *state = CRYPTO_THREAD_get_local(&err_thread_local);
650 CRYPTO_THREAD_set_local(&err_thread_local, NULL);
651 ERR_STATE_free(state);
654 #if !OPENSSL_API_1_1_0
655 void ERR_remove_thread_state(void *dummy)
660 #if !OPENSSL_API_1_0_0
661 void ERR_remove_state(unsigned long pid)
666 DEFINE_RUN_ONCE_STATIC(err_do_init)
668 set_err_thread_local = 1;
669 return CRYPTO_THREAD_init_local(&err_thread_local, NULL);
672 ERR_STATE *ERR_get_state(void)
675 int saveerrno = get_last_sys_error();
677 if (!OPENSSL_init_crypto(OPENSSL_INIT_BASE_ONLY, NULL))
680 if (!RUN_ONCE(&err_init, err_do_init))
683 state = CRYPTO_THREAD_get_local(&err_thread_local);
684 if (state == (ERR_STATE*)-1)
688 if (!CRYPTO_THREAD_set_local(&err_thread_local, (ERR_STATE*)-1))
691 if ((state = OPENSSL_zalloc(sizeof(*state))) == NULL) {
692 CRYPTO_THREAD_set_local(&err_thread_local, NULL);
696 if (!ossl_init_thread_start(NULL, NULL, err_delete_thread_state)
697 || !CRYPTO_THREAD_set_local(&err_thread_local, state)) {
698 ERR_STATE_free(state);
699 CRYPTO_THREAD_set_local(&err_thread_local, NULL);
703 /* Ignore failures from these */
704 OPENSSL_init_crypto(OPENSSL_INIT_LOAD_CRYPTO_STRINGS, NULL);
707 set_sys_error(saveerrno);
712 * err_shelve_state returns the current thread local error state
713 * and freezes the error module until err_unshelve_state is called.
715 int err_shelve_state(void **state)
717 int saveerrno = get_last_sys_error();
720 * Note, at present our only caller is OPENSSL_init_crypto(), indirectly
721 * via ossl_init_load_crypto_nodelete(), by which point the requested
722 * "base" initialization has already been performed, so the below call is a
723 * NOOP, that re-enters OPENSSL_init_crypto() only to quickly return.
725 * If are no other valid callers of this function, the call below can be
726 * removed, avoiding the re-entry into OPENSSL_init_crypto(). If there are
727 * potential uses that are not from inside OPENSSL_init_crypto(), then this
728 * call is needed, but some care is required to make sure that the re-entry
731 if (!OPENSSL_init_crypto(OPENSSL_INIT_BASE_ONLY, NULL))
734 if (!RUN_ONCE(&err_init, err_do_init))
737 *state = CRYPTO_THREAD_get_local(&err_thread_local);
738 if (!CRYPTO_THREAD_set_local(&err_thread_local, (ERR_STATE*)-1))
741 set_sys_error(saveerrno);
746 * err_unshelve_state restores the error state that was returned
747 * by err_shelve_state previously.
749 void err_unshelve_state(void* state)
751 if (state != (void*)-1)
752 CRYPTO_THREAD_set_local(&err_thread_local, (ERR_STATE*)state);
755 int ERR_get_next_error_library(void)
759 if (!RUN_ONCE(&err_string_init, do_err_strings_init))
762 CRYPTO_THREAD_write_lock(err_string_lock);
763 ret = int_err_library_number++;
764 CRYPTO_THREAD_unlock(err_string_lock);
768 static int err_set_error_data_int(char *data, int flags)
773 es = ERR_get_state();
779 err_clear_data(es, i);
780 es->err_data[i] = data;
781 es->err_data_flags[i] = flags;
786 void ERR_set_error_data(char *data, int flags)
789 * This function is void so we cannot propagate the error return. Since it
790 * is also in the public API we can't change the return type.
792 err_set_error_data_int(data, flags);
795 void ERR_add_error_data(int num, ...)
799 ERR_add_error_vdata(num, args);
803 void ERR_add_error_vdata(int num, va_list args)
809 /* Get the current error data; if an allocated string get it. */
810 es = ERR_get_state();
814 p = es->err_data_flags[i] == (ERR_TXT_MALLOCED | ERR_TXT_STRING)
815 ? es->err_data[i] : "";
817 /* Start with initial (or empty) string and allocate a new buffer */
818 size = 80 + strlen(p);
819 if ((str = OPENSSL_malloc(size + 1)) == NULL) {
820 /* ERRerr(ERR_F_ERR_ADD_ERROR_VDATA, ERR_R_MALLOC_FAILURE); */
825 for (len = 0; --num >= 0; ) {
826 arg = va_arg(args, char *);
832 p = OPENSSL_realloc(str, size + 1);
839 OPENSSL_strlcat(str, arg, (size_t)size + 1);
841 if (!err_set_error_data_int(str, ERR_TXT_MALLOCED | ERR_TXT_STRING))
845 int ERR_set_mark(void)
849 es = ERR_get_state();
853 if (es->bottom == es->top)
855 es->err_flags[es->top] |= ERR_FLAG_MARK;
859 int ERR_pop_to_mark(void)
863 es = ERR_get_state();
867 while (es->bottom != es->top
868 && (es->err_flags[es->top] & ERR_FLAG_MARK) == 0) {
869 err_clear(es, es->top);
870 es->top = es->top > 0 ? es->top - 1 : ERR_NUM_ERRORS - 1;
873 if (es->bottom == es->top)
875 es->err_flags[es->top] &= ~ERR_FLAG_MARK;
879 int ERR_clear_last_mark(void)
884 es = ERR_get_state();
889 while (es->bottom != top
890 && (es->err_flags[top] & ERR_FLAG_MARK) == 0) {
891 top = top > 0 ? top - 1 : ERR_NUM_ERRORS - 1;
894 if (es->bottom == top)
896 es->err_flags[top] &= ~ERR_FLAG_MARK;
900 void err_clear_last_constant_time(int clear)
905 es = ERR_get_state();
912 * Flag error as cleared but remove it elsewhere to avoid two errors
913 * accessing the same error stack location, revealing timing information.
915 clear = constant_time_select_int(constant_time_eq_int(clear, 0),
917 es->err_flags[top] |= clear;