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