diff options
Diffstat (limited to 'crypto/err/err.c')
| -rw-r--r-- | crypto/err/err.c | 47 |
1 files changed, 23 insertions, 24 deletions
diff --git a/crypto/err/err.c b/crypto/err/err.c index 5ce774a3f5..d02e8ffae0 100644 --- a/crypto/err/err.c +++ b/crypto/err/err.c @@ -827,8 +827,24 @@ static unsigned long get_error_values(int inc, int top, const char **file, return ERR_R_INTERNAL_ERROR; } + while (es->bottom != es->top) { + if (es->err_flags[es->top] & ERR_FLAG_CLEAR) { + err_clear(es, es->top); + es->top = es->top > 0 ? es->top - 1 : ERR_NUM_ERRORS - 1; + continue; + } + i = (es->bottom + 1) % ERR_NUM_ERRORS; + if (es->err_flags[i] & ERR_FLAG_CLEAR) { + es->bottom = i; + err_clear(es, es->bottom); + continue; + } + break; + } + if (es->bottom == es->top) return 0; + if (top) i = es->top; /* last error */ else @@ -1158,23 +1174,6 @@ int ERR_pop_to_mark(void) return 1; } -#ifdef UINTPTR_T -# undef UINTPTR_T -#endif -/* - * uintptr_t is the answer, but unformtunately we can't assume that all - * compilers supported by 1.0.2 have it :-( - */ -#if defined(OPENSSL_SYS_VMS) && __INITIAL_POINTER_SIZE==64 -/* - * But we can't use size_t on VMS, because it adheres to sizeof(size_t)==4 - * even in 64-bit builds, which means that it won't work as mask. - */ -# define UINTPTR_T unsigned long long -#else -# define UINTPTR_T size_t -#endif - void err_clear_last_constant_time(int clear) { ERR_STATE *es; @@ -1186,11 +1185,11 @@ void err_clear_last_constant_time(int clear) top = es->top; - es->err_flags[top] &= ~(0 - clear); - es->err_buffer[top] &= ~(0UL - clear); - es->err_file[top] = (const char *)((UINTPTR_T)es->err_file[top] & - ~((UINTPTR_T)0 - clear)); - es->err_line[top] |= 0 - clear; - - es->top = (top + ERR_NUM_ERRORS - clear) % ERR_NUM_ERRORS; + /* + * Flag error as cleared but remove it elsewhere to avoid two errors + * accessing the same error stack location, revealing timing information. + */ + clear = constant_time_select_int(constant_time_eq_int(clear, 0), + 0, ERR_FLAG_CLEAR); + es->err_flags[top] |= clear; } |