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/* 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>
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