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"
27 static int err_load_strings(const ERR_STRING_DATA *str);
29 static void ERR_STATE_free(ERR_STATE *s);
30 #ifndef OPENSSL_NO_ERR
31 static ERR_STRING_DATA ERR_str_libraries[] = {
32 {ERR_PACK(ERR_LIB_NONE, 0, 0), "unknown library"},
33 {ERR_PACK(ERR_LIB_SYS, 0, 0), "system library"},
34 {ERR_PACK(ERR_LIB_BN, 0, 0), "bignum routines"},
35 {ERR_PACK(ERR_LIB_RSA, 0, 0), "rsa routines"},
36 {ERR_PACK(ERR_LIB_DH, 0, 0), "Diffie-Hellman routines"},
37 {ERR_PACK(ERR_LIB_EVP, 0, 0), "digital envelope routines"},
38 {ERR_PACK(ERR_LIB_BUF, 0, 0), "memory buffer routines"},
39 {ERR_PACK(ERR_LIB_OBJ, 0, 0), "object identifier routines"},
40 {ERR_PACK(ERR_LIB_PEM, 0, 0), "PEM routines"},
41 {ERR_PACK(ERR_LIB_DSA, 0, 0), "dsa routines"},
42 {ERR_PACK(ERR_LIB_X509, 0, 0), "x509 certificate routines"},
43 {ERR_PACK(ERR_LIB_ASN1, 0, 0), "asn1 encoding routines"},
44 {ERR_PACK(ERR_LIB_CONF, 0, 0), "configuration file routines"},
45 {ERR_PACK(ERR_LIB_CRYPTO, 0, 0), "common libcrypto routines"},
46 {ERR_PACK(ERR_LIB_EC, 0, 0), "elliptic curve routines"},
47 {ERR_PACK(ERR_LIB_ECDSA, 0, 0), "ECDSA routines"},
48 {ERR_PACK(ERR_LIB_ECDH, 0, 0), "ECDH routines"},
49 {ERR_PACK(ERR_LIB_SSL, 0, 0), "SSL routines"},
50 {ERR_PACK(ERR_LIB_BIO, 0, 0), "BIO routines"},
51 {ERR_PACK(ERR_LIB_PKCS7, 0, 0), "PKCS7 routines"},
52 {ERR_PACK(ERR_LIB_X509V3, 0, 0), "X509 V3 routines"},
53 {ERR_PACK(ERR_LIB_PKCS12, 0, 0), "PKCS12 routines"},
54 {ERR_PACK(ERR_LIB_RAND, 0, 0), "random number generator"},
55 {ERR_PACK(ERR_LIB_DSO, 0, 0), "DSO support routines"},
56 {ERR_PACK(ERR_LIB_TS, 0, 0), "time stamp routines"},
57 {ERR_PACK(ERR_LIB_ENGINE, 0, 0), "engine routines"},
58 {ERR_PACK(ERR_LIB_OCSP, 0, 0), "OCSP routines"},
59 {ERR_PACK(ERR_LIB_UI, 0, 0), "UI routines"},
60 {ERR_PACK(ERR_LIB_FIPS, 0, 0), "FIPS routines"},
61 {ERR_PACK(ERR_LIB_CMS, 0, 0), "CMS routines"},
62 {ERR_PACK(ERR_LIB_CRMF, 0, 0), "CRMF routines"},
63 {ERR_PACK(ERR_LIB_CMP, 0, 0), "CMP routines"},
64 {ERR_PACK(ERR_LIB_HMAC, 0, 0), "HMAC routines"},
65 {ERR_PACK(ERR_LIB_CT, 0, 0), "CT routines"},
66 {ERR_PACK(ERR_LIB_ASYNC, 0, 0), "ASYNC 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 static void ERR_STATE_free(ERR_STATE *s)
244 for (i = 0; i < ERR_NUM_ERRORS; i++) {
245 err_clear_data(s, i, 1);
250 DEFINE_RUN_ONCE_STATIC(do_err_strings_init)
252 if (!OPENSSL_init_crypto(0, NULL))
254 err_string_lock = CRYPTO_THREAD_lock_new();
255 if (err_string_lock == NULL)
257 int_error_hash = lh_ERR_STRING_DATA_new(err_string_data_hash,
258 err_string_data_cmp);
259 if (int_error_hash == NULL) {
260 CRYPTO_THREAD_lock_free(err_string_lock);
261 err_string_lock = NULL;
267 void err_cleanup(void)
269 if (set_err_thread_local != 0)
270 CRYPTO_THREAD_cleanup_local(&err_thread_local);
271 CRYPTO_THREAD_lock_free(err_string_lock);
272 err_string_lock = NULL;
273 lh_ERR_STRING_DATA_free(int_error_hash);
274 int_error_hash = NULL;
278 * Legacy; pack in the library.
280 static void err_patch(int lib, ERR_STRING_DATA *str)
282 unsigned long plib = ERR_PACK(lib, 0, 0);
284 for (; str->error != 0; str++)
289 * Hash in |str| error strings. Assumes the URN_ONCE was done.
291 static int err_load_strings(const ERR_STRING_DATA *str)
293 CRYPTO_THREAD_write_lock(err_string_lock);
294 for (; str->error; str++)
295 (void)lh_ERR_STRING_DATA_insert(int_error_hash,
296 (ERR_STRING_DATA *)str);
297 CRYPTO_THREAD_unlock(err_string_lock);
301 int ERR_load_ERR_strings(void)
303 #ifndef OPENSSL_NO_ERR
304 if (!RUN_ONCE(&err_string_init, do_err_strings_init))
307 err_load_strings(ERR_str_libraries);
308 err_load_strings(ERR_str_reasons);
309 build_SYS_str_reasons();
314 int ERR_load_strings(int lib, ERR_STRING_DATA *str)
316 if (ERR_load_ERR_strings() == 0)
320 err_load_strings(str);
324 int ERR_load_strings_const(const ERR_STRING_DATA *str)
326 if (ERR_load_ERR_strings() == 0)
328 err_load_strings(str);
332 int ERR_unload_strings(int lib, ERR_STRING_DATA *str)
334 if (!RUN_ONCE(&err_string_init, do_err_strings_init))
337 CRYPTO_THREAD_write_lock(err_string_lock);
339 * We don't need to ERR_PACK the lib, since that was done (to
340 * the table) when it was loaded.
342 for (; str->error; str++)
343 (void)lh_ERR_STRING_DATA_delete(int_error_hash, str);
344 CRYPTO_THREAD_unlock(err_string_lock);
349 void err_free_strings_int(void)
351 if (!RUN_ONCE(&err_string_init, do_err_strings_init))
355 /********************************************************/
357 void ERR_clear_error(void)
362 es = ERR_get_state();
366 for (i = 0; i < ERR_NUM_ERRORS; i++) {
369 es->top = es->bottom = 0;
372 unsigned long ERR_get_error(void)
374 return get_error_values(1, 0, NULL, NULL, NULL, NULL);
377 unsigned long ERR_get_error_line(const char **file, int *line)
379 return get_error_values(1, 0, file, line, NULL, NULL);
382 unsigned long ERR_get_error_line_data(const char **file, int *line,
383 const char **data, int *flags)
385 return get_error_values(1, 0, file, line, data, flags);
388 unsigned long ERR_peek_error(void)
390 return get_error_values(0, 0, NULL, NULL, NULL, NULL);
393 unsigned long ERR_peek_error_line(const char **file, int *line)
395 return get_error_values(0, 0, file, line, NULL, NULL);
398 unsigned long ERR_peek_error_line_data(const char **file, int *line,
399 const char **data, int *flags)
401 return get_error_values(0, 0, file, line, data, flags);
404 unsigned long ERR_peek_last_error(void)
406 return get_error_values(0, 1, NULL, NULL, NULL, NULL);
409 unsigned long ERR_peek_last_error_line(const char **file, int *line)
411 return get_error_values(0, 1, file, line, NULL, NULL);
414 unsigned long ERR_peek_last_error_line_data(const char **file, int *line,
415 const char **data, int *flags)
417 return get_error_values(0, 1, file, line, data, flags);
420 static unsigned long get_error_values(int inc, int top, const char **file,
421 int *line, const char **data,
428 es = ERR_get_state();
442 return ERR_R_INTERNAL_ERROR;
445 while (es->bottom != es->top) {
446 if (es->err_flags[es->top] & ERR_FLAG_CLEAR) {
447 err_clear(es, es->top, 0);
448 es->top = es->top > 0 ? es->top - 1 : ERR_NUM_ERRORS - 1;
451 i = (es->bottom + 1) % ERR_NUM_ERRORS;
452 if (es->err_flags[i] & ERR_FLAG_CLEAR) {
454 err_clear(es, es->bottom, 0);
460 if (es->bottom == es->top)
464 i = es->top; /* last error */
466 i = (es->bottom + 1) % ERR_NUM_ERRORS; /* first error */
468 ret = es->err_buffer[i];
471 es->err_buffer[i] = 0;
474 if (file != NULL && line != NULL) {
475 if (es->err_file[i] == NULL) {
479 *file = es->err_file[i];
480 *line = es->err_line[i];
486 err_clear_data(es, i, 0);
489 if (es->err_data[i] == NULL) {
494 *data = es->err_data[i];
496 *flags = es->err_data_flags[i];
502 void ERR_error_string_n(unsigned long e, char *buf, size_t len)
504 char lsbuf[64], rsbuf[64];
506 unsigned long f = 0, l, r;
512 ls = ERR_lib_error_string(e);
514 BIO_snprintf(lsbuf, sizeof(lsbuf), "lib(%lu)", l);
518 rs = ERR_reason_error_string(e);
519 r = ERR_GET_REASON(e);
521 BIO_snprintf(rsbuf, sizeof(rsbuf), "reason(%lu)", r);
525 BIO_snprintf(buf, len, "error:%08lX:%s:%s:%s", e, ls, "", rs);
526 if (strlen(buf) == len - 1) {
527 /* Didn't fit; use a minimal format. */
528 BIO_snprintf(buf, len, "err:%lx:%lx:%lx:%lx", e, l, f, r);
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 const char *ERR_func_error_string(unsigned long e)
563 if (!RUN_ONCE(&err_string_init, do_err_strings_init))
565 return ERR_GET_LIB(e) == ERR_LIB_SYS ? "system library" : NULL;
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 r = ERR_GET_REASON(e);
579 d.error = ERR_PACK(l, 0, r);
580 p = int_err_get_item(&d);
582 d.error = ERR_PACK(0, 0, r);
583 p = int_err_get_item(&d);
585 return ((p == NULL) ? NULL : p->string);
588 /* TODO(3.0): arg ignored for now */
589 static void err_delete_thread_state(void *arg)
591 ERR_STATE *state = CRYPTO_THREAD_get_local(&err_thread_local);
595 CRYPTO_THREAD_set_local(&err_thread_local, NULL);
596 ERR_STATE_free(state);
599 #if !OPENSSL_API_1_1_0
600 void ERR_remove_thread_state(void *dummy)
605 #if !OPENSSL_API_1_0_0
606 void ERR_remove_state(unsigned long pid)
611 DEFINE_RUN_ONCE_STATIC(err_do_init)
613 set_err_thread_local = 1;
614 return CRYPTO_THREAD_init_local(&err_thread_local, NULL);
617 ERR_STATE *ERR_get_state(void)
620 int saveerrno = get_last_sys_error();
622 if (!OPENSSL_init_crypto(OPENSSL_INIT_BASE_ONLY, NULL))
625 if (!RUN_ONCE(&err_init, err_do_init))
628 state = CRYPTO_THREAD_get_local(&err_thread_local);
629 if (state == (ERR_STATE*)-1)
633 if (!CRYPTO_THREAD_set_local(&err_thread_local, (ERR_STATE*)-1))
636 if ((state = OPENSSL_zalloc(sizeof(*state))) == NULL) {
637 CRYPTO_THREAD_set_local(&err_thread_local, NULL);
641 if (!ossl_init_thread_start(NULL, NULL, err_delete_thread_state)
642 || !CRYPTO_THREAD_set_local(&err_thread_local, state)) {
643 ERR_STATE_free(state);
644 CRYPTO_THREAD_set_local(&err_thread_local, NULL);
648 /* Ignore failures from these */
649 OPENSSL_init_crypto(OPENSSL_INIT_LOAD_CRYPTO_STRINGS, NULL);
652 set_sys_error(saveerrno);
657 * err_shelve_state returns the current thread local error state
658 * and freezes the error module until err_unshelve_state is called.
660 int err_shelve_state(void **state)
662 int saveerrno = get_last_sys_error();
665 * Note, at present our only caller is OPENSSL_init_crypto(), indirectly
666 * via ossl_init_load_crypto_nodelete(), by which point the requested
667 * "base" initialization has already been performed, so the below call is a
668 * NOOP, that re-enters OPENSSL_init_crypto() only to quickly return.
670 * If are no other valid callers of this function, the call below can be
671 * removed, avoiding the re-entry into OPENSSL_init_crypto(). If there are
672 * potential uses that are not from inside OPENSSL_init_crypto(), then this
673 * call is needed, but some care is required to make sure that the re-entry
676 if (!OPENSSL_init_crypto(OPENSSL_INIT_BASE_ONLY, NULL))
679 if (!RUN_ONCE(&err_init, err_do_init))
682 *state = CRYPTO_THREAD_get_local(&err_thread_local);
683 if (!CRYPTO_THREAD_set_local(&err_thread_local, (ERR_STATE*)-1))
686 set_sys_error(saveerrno);
691 * err_unshelve_state restores the error state that was returned
692 * by err_shelve_state previously.
694 void err_unshelve_state(void* state)
696 if (state != (void*)-1)
697 CRYPTO_THREAD_set_local(&err_thread_local, (ERR_STATE*)state);
700 int ERR_get_next_error_library(void)
704 if (!RUN_ONCE(&err_string_init, do_err_strings_init))
707 CRYPTO_THREAD_write_lock(err_string_lock);
708 ret = int_err_library_number++;
709 CRYPTO_THREAD_unlock(err_string_lock);
713 static int err_set_error_data_int(char *data, size_t size, int flags,
718 es = ERR_get_state();
722 err_clear_data(es, es->top, deallocate);
723 err_set_data(es, es->top, data, size, flags);
728 void ERR_set_error_data(char *data, int flags)
731 * This function is void so we cannot propagate the error return. Since it
732 * is also in the public API we can't change the return type.
734 * We estimate the size of the data. If it's not flagged as allocated,
735 * then this is safe, and if it is flagged as allocated, then our size
736 * may be smaller than the actual allocation, but that doesn't matter
737 * too much, the buffer will remain untouched or will eventually be
738 * reallocated to a new size.
740 * callers should be advised that this function takes over ownership of
741 * the allocated memory, i.e. they can't count on the pointer to remain
744 err_set_error_data_int(data, strlen(data) + 1, flags, 1);
747 void ERR_add_error_data(int num, ...)
751 ERR_add_error_vdata(num, args);
755 void ERR_add_error_vdata(int num, va_list args)
758 int flags = ERR_TXT_MALLOCED | ERR_TXT_STRING;
762 /* Get the current error data; if an allocated string get it. */
763 es = ERR_get_state();
769 * If err_data is allocated already, re-use the space.
770 * Otherwise, allocate a small new buffer.
772 if ((es->err_data_flags[i] & flags) == flags) {
773 str = es->err_data[i];
774 size = es->err_data_size[i];
777 * To protect the string we just grabbed from tampering by other
778 * functions we may call, or to protect them from freeing a pointer
779 * that may no longer be valid at that point, we clear away the
780 * data pointer and the flags. We will set them again at the end
783 es->err_data[i] = NULL;
784 es->err_data_flags[i] = 0;
785 } else if ((str = OPENSSL_malloc(size = 81)) == NULL) {
793 arg = va_arg(args, char *);
801 p = OPENSSL_realloc(str, size);
808 OPENSSL_strlcat(str, arg, (size_t)size);
810 if (!err_set_error_data_int(str, size, flags, 0))
814 int ERR_set_mark(void)
818 es = ERR_get_state();
822 if (es->bottom == es->top)
824 es->err_flags[es->top] |= ERR_FLAG_MARK;
828 int ERR_pop_to_mark(void)
832 es = ERR_get_state();
836 while (es->bottom != es->top
837 && (es->err_flags[es->top] & ERR_FLAG_MARK) == 0) {
838 err_clear(es, es->top, 0);
839 es->top = es->top > 0 ? es->top - 1 : ERR_NUM_ERRORS - 1;
842 if (es->bottom == es->top)
844 es->err_flags[es->top] &= ~ERR_FLAG_MARK;
848 int ERR_clear_last_mark(void)
853 es = ERR_get_state();
858 while (es->bottom != top
859 && (es->err_flags[top] & ERR_FLAG_MARK) == 0) {
860 top = top > 0 ? top - 1 : ERR_NUM_ERRORS - 1;
863 if (es->bottom == top)
865 es->err_flags[top] &= ~ERR_FLAG_MARK;
869 void err_clear_last_constant_time(int clear)
874 es = ERR_get_state();
881 * Flag error as cleared but remove it elsewhere to avoid two errors
882 * accessing the same error stack location, revealing timing information.
884 clear = constant_time_select_int(constant_time_eq_int(clear, 0),
886 es->err_flags[top] |= clear;