mirror of
https://sourceware.org/git/glibc.git
synced 2024-12-01 01:00:10 +00:00
83 lines
2.3 KiB
C
83 lines
2.3 KiB
C
/* Testcase for BZ 30932.
|
|
Copyright (C) 2023-2024 Free Software Foundation, Inc.
|
|
This file is part of the GNU C Library.
|
|
|
|
The GNU C Library is free software; you can redistribute it and/or
|
|
modify it under the terms of the GNU Lesser General Public
|
|
License as published by the Free Software Foundation; either
|
|
version 2.1 of the License, or (at your option) any later version.
|
|
|
|
The GNU C Library is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
Lesser General Public License for more details.
|
|
|
|
You should have received a copy of the GNU Lesser General Public
|
|
License along with the GNU C Library; if not, see
|
|
<https://www.gnu.org/licenses/>. */
|
|
|
|
#include <errno.h>
|
|
#include <setjmp.h>
|
|
#include <stdbool.h>
|
|
#include <stdio.h>
|
|
#include <string.h>
|
|
#include <sys/resource.h>
|
|
#include <unistd.h>
|
|
|
|
#include <support/check.h>
|
|
#include <support/support.h>
|
|
#include <support/temp_file.h>
|
|
|
|
jmp_buf chk_fail_buf;
|
|
bool chk_fail_ok;
|
|
|
|
const char *str2 = "F";
|
|
char buf2[10] = "%s";
|
|
|
|
static int
|
|
do_test (void)
|
|
{
|
|
struct rlimit rl;
|
|
int max_fd = 24;
|
|
|
|
if (getrlimit (RLIMIT_NOFILE, &rl) == -1)
|
|
FAIL_EXIT1 ("getrlimit (RLIMIT_NOFILE): %m");
|
|
|
|
max_fd = (rl.rlim_cur < max_fd ? rl.rlim_cur : max_fd);
|
|
rl.rlim_cur = max_fd;
|
|
|
|
if (setrlimit (RLIMIT_NOFILE, &rl) == 1)
|
|
FAIL_EXIT1 ("setrlimit (RLIMIT_NOFILE): %m");
|
|
|
|
/* Exhaust the file descriptor limit with temporary files. */
|
|
int nfiles = 0;
|
|
for (; nfiles < max_fd; nfiles++)
|
|
{
|
|
int fd = create_temp_file ("tst-sprintf-fortify-rdonly-.", NULL);
|
|
if (fd == -1)
|
|
{
|
|
if (errno != EMFILE)
|
|
FAIL_EXIT1 ("create_temp_file: %m");
|
|
break;
|
|
}
|
|
}
|
|
TEST_VERIFY_EXIT (nfiles != 0);
|
|
|
|
/* When the format string is writable and contains %n,
|
|
with -D_FORTIFY_SOURCE=2 it causes __chk_fail. However, if libc can not
|
|
open procfs to check if the input format string in within a writable
|
|
memory segment, the fortify version can not perform the check. */
|
|
char buf[128];
|
|
int n1;
|
|
int n2;
|
|
|
|
strcpy (buf2 + 2, "%n%s%n");
|
|
if (sprintf (buf, buf2, str2, &n1, str2, &n2) != 2
|
|
|| n1 != 1 || n2 != 2)
|
|
FAIL_EXIT1 ("sprintf failed: %s %d %d", buf, n1, n2);
|
|
|
|
return 0;
|
|
}
|
|
|
|
#include <support/test-driver.c>
|