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The tst-ttyname-direct.c checks the ttyname with procfs mounted in bind mode (MS_BIND|MS_REC), while tst-ttyname-namespace.c checks with procfs mount with MS_NOSUID|MS_NOEXEC|MS_NODEV in a new namespace. Checked on x86_64-linux-gnu and aarch64-linux-gnu. Reviewed-by: Siddhesh Poyarekar <siddhesh@sourceware.org>
111 lines
3.3 KiB
C
111 lines
3.3 KiB
C
/* Copyright (C) 2017-2023 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 License as
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published by the Free Software Foundation; either version 2.1 of the
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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; see the file COPYING.LIB. If
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not, see <https://www.gnu.org/licenses/>. */
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#include <sched.h>
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#include <sys/prctl.h>
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#include <support/namespace.h>
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#include "tst-ttyname-common.c"
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/* These chroot setup functions put the TTY at at "/console" (where it
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won't be found by ttyname), and create "/dev/console" as an
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ordinary file. This way, it's easier to write test-cases that
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expect ttyname to fail; test-cases that expect it to succeed need
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to explicitly remount it at "/dev/console". */
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static int
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do_in_chroot_1 (int (*cb)(const char *, int))
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{
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printf ("info: entering chroot 1\n");
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/* Open the PTS that we'll be testing on. */
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int master;
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char *slavename;
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master = posix_openpt (O_RDWR|O_NOCTTY|O_NONBLOCK);
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if (master < 0)
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{
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if (errno == ENOENT)
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FAIL_UNSUPPORTED ("posix_openpt: %m");
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else
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FAIL_EXIT1 ("posix_openpt: %m");
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}
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VERIFY ((slavename = ptsname (master)));
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VERIFY (unlockpt (master) == 0);
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if (strncmp (slavename, "/dev/pts/", 9) != 0)
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FAIL_UNSUPPORTED ("slave pseudo-terminal is not under /dev/pts/: %s",
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slavename);
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adjust_file_limit (slavename);
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int slave = xopen (slavename, O_RDWR, 0);
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if (!doit (slave, "basic smoketest",
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(struct result_r){.name=slavename, .ret=0, .err=0}))
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return 1;
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pid_t pid = xfork ();
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if (pid == 0)
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{
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xclose (master);
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if (!support_enter_mount_namespace ())
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FAIL_UNSUPPORTED ("could not enter new mount namespace");
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VERIFY (mount ("tmpfs", chrootdir, "tmpfs", 0, "mode=755") == 0);
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VERIFY (chdir (chrootdir) == 0);
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xmkdir ("proc", 0755);
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xmkdir ("dev", 0755);
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xmkdir ("dev/pts", 0755);
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VERIFY (mount ("/proc", "proc", NULL, MS_BIND|MS_REC, NULL) == 0);
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VERIFY (mount ("devpts", "dev/pts", "devpts",
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MS_NOSUID|MS_NOEXEC,
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"newinstance,ptmxmode=0666,mode=620") == 0);
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VERIFY (symlink ("pts/ptmx", "dev/ptmx") == 0);
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touch ("console", 0);
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touch ("dev/console", 0);
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VERIFY (mount (slavename, "console", NULL, MS_BIND, NULL) == 0);
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xchroot (".");
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char *linkname = xasprintf ("/proc/self/fd/%d", slave);
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char *target = proc_fd_readlink (linkname);
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VERIFY (strcmp (target, slavename) == 0);
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free (linkname);
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_exit (cb (slavename, slave));
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}
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int status;
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xwaitpid (pid, &status, 0);
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VERIFY (WIFEXITED (status));
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xclose (master);
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xclose (slave);
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return WEXITSTATUS (status);
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}
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static int
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do_test (void)
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{
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support_become_root ();
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do_in_chroot_1 (run_chroot_tests);
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return 0;
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}
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#include <support/test-driver.c>
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