freebsd-dev/lib/libc/locale/ldpart.c
Jilles Tjoelker 05eb11cbc4 libc: Use O_CLOEXEC for various internal file descriptors.
This fixes a race condition where another thread may fork() before CLOEXEC
is set, unintentionally passing the descriptor to the child process.

This commit only adds O_CLOEXEC flags to open() or openat() calls where no
fcntl(fd, F_SETFD, FD_CLOEXEC) follows. The separate fcntl() call still
leaves a race window so it should be fixed later.
2012-09-29 11:54:34 +00:00

167 lines
4.1 KiB
C

/*
* Copyright (c) 2000, 2001 Alexey Zelkin <phantom@FreeBSD.org>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include "namespace.h"
#include <sys/types.h>
#include <sys/stat.h>
#include <errno.h>
#include <fcntl.h>
#include <limits.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "un-namespace.h"
#include "ldpart.h"
#include "setlocale.h"
static int split_lines(char *, const char *);
int
__part_load_locale(const char *name,
int *using_locale,
char **locale_buf,
const char *category_filename,
int locale_buf_size_max,
int locale_buf_size_min,
const char **dst_localebuf)
{
int saverr, fd, i, num_lines;
char *lbuf, *p;
const char *plim;
char filename[PATH_MAX];
struct stat st;
size_t namesize, bufsize;
/* 'name' must be already checked. */
if (strcmp(name, "C") == 0 || strcmp(name, "POSIX") == 0) {
*using_locale = 0;
return (_LDP_CACHE);
}
/*
* If the locale name is the same as our cache, use the cache.
*/
if (*locale_buf != NULL && strcmp(name, *locale_buf) == 0) {
*using_locale = 1;
return (_LDP_CACHE);
}
/*
* Slurp the locale file into the cache.
*/
namesize = strlen(name) + 1;
/* 'PathLocale' must be already set & checked. */
/* Range checking not needed, 'name' size is limited */
strcpy(filename, _PathLocale);
strcat(filename, "/");
strcat(filename, name);
strcat(filename, "/");
strcat(filename, category_filename);
if ((fd = _open(filename, O_RDONLY | O_CLOEXEC)) < 0)
return (_LDP_ERROR);
if (_fstat(fd, &st) != 0)
goto bad_locale;
if (st.st_size <= 0) {
errno = EFTYPE;
goto bad_locale;
}
bufsize = namesize + st.st_size;
if ((lbuf = malloc(bufsize)) == NULL) {
errno = ENOMEM;
goto bad_locale;
}
(void)strcpy(lbuf, name);
p = lbuf + namesize;
plim = p + st.st_size;
if (_read(fd, p, (size_t) st.st_size) != st.st_size)
goto bad_lbuf;
/*
* Parse the locale file into localebuf.
*/
if (plim[-1] != '\n') {
errno = EFTYPE;
goto bad_lbuf;
}
num_lines = split_lines(p, plim);
if (num_lines >= locale_buf_size_max)
num_lines = locale_buf_size_max;
else if (num_lines >= locale_buf_size_min)
num_lines = locale_buf_size_min;
else {
errno = EFTYPE;
goto bad_lbuf;
}
(void)_close(fd);
/*
* Record the successful parse in the cache.
*/
if (*locale_buf != NULL)
free(*locale_buf);
*locale_buf = lbuf;
for (p = *locale_buf, i = 0; i < num_lines; i++)
dst_localebuf[i] = (p += strlen(p) + 1);
for (i = num_lines; i < locale_buf_size_max; i++)
dst_localebuf[i] = NULL;
*using_locale = 1;
return (_LDP_LOADED);
bad_lbuf:
saverr = errno;
free(lbuf);
errno = saverr;
bad_locale:
saverr = errno;
(void)_close(fd);
errno = saverr;
return (_LDP_ERROR);
}
static int
split_lines(char *p, const char *plim)
{
int i;
i = 0;
while (p < plim) {
if (*p == '\n') {
*p = '\0';
i++;
}
p++;
}
return (i);
}