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Smarter build of system error text database

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We stored copies of the system error texts in a fixed line size array,
which is a huge waste.  Instead, use a static memory pool and pack all
the string in there.  The wasted space at the end, if any, gives us
some leeway for longer strings than we have measured so far.

Reviewed-by: Matt Caswell <matt@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/7681)
This commit is contained in:
Richard Levitte 2018-11-21 18:25:53 +01:00
parent b92678f4e9
commit 2c5b6bbb67
1 changed files with 14 additions and 5 deletions
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19
crypto/err/err.c
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@ -181,8 +181,9 @@ static ERR_STRING_DATA *int_err_get_item(const ERR_STRING_DATA *d)
}
#ifndef OPENSSL_NO_ERR
/* A measurement on Linux 2018-11-21 showed about 3.5kib */
# define SPACE_SYS_STR_REASONS 4 * 1024
# define NUM_SYS_STR_REASONS 127
# define LEN_SYS_STR_REASON 32
static ERR_STRING_DATA SYS_str_reasons[NUM_SYS_STR_REASONS + 1];
/*
@ -198,7 +199,9 @@ static ERR_STRING_DATA SYS_str_reasons[NUM_SYS_STR_REASONS + 1];
static void build_SYS_str_reasons(void)
{
/* OPENSSL_malloc cannot be used here, use static storage instead */
static char strerror_tab[NUM_SYS_STR_REASONS][LEN_SYS_STR_REASON];
static char strerror_pool[SPACE_SYS_STR_REASONS];
char *cur = strerror_pool;
size_t cnt = 0;
static int init = 1;
int i;
@ -213,9 +216,15 @@ static void build_SYS_str_reasons(void)
str->error = ERR_PACK(ERR_LIB_SYS, 0, i);
if (str->string == NULL) {
char (*dest)[LEN_SYS_STR_REASON] = &(strerror_tab[i - 1]);
if (openssl_strerror_r(i, *dest, sizeof(*dest)))
str->string = *dest;
if (openssl_strerror_r(i, cur, sizeof(strerror_pool) - cnt)) {
size_t l = strlen(cur) + 1;
str->string = cur;
cnt += l;
if (cnt > sizeof(strerror_pool))
cnt = sizeof(strerror_pool);
cur += l;
}
}
if (str->string == NULL)
str->string = "unknown";