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148 lines
4.2 KiB
C
148 lines
4.2 KiB
C
/* Tests for ttyname/ttyname_r with namespaces.
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Copyright (C) 2017-2024 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 <sys/wait.h>
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#include <support/namespace.h>
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#include "tst-ttyname-common.c"
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static int
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do_in_chroot_2 (int (*cb)(const char *, int))
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{
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printf ("info: entering chroot 2\n");
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int pid_pipe[2];
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xpipe (pid_pipe);
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int exit_pipe[2];
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xpipe (exit_pipe);
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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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VERIFY ((master = posix_openpt (O_RDWR|O_NOCTTY|O_NONBLOCK)) >= 0);
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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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/* wait until in a new mount ns to open the slave */
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/* enable `wait`ing on grandchildren */
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VERIFY (prctl (PR_SET_CHILD_SUBREAPER, 1) == 0);
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pid_t pid = xfork (); /* outer child */
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if (pid == 0)
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{
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xclose (master);
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xclose (pid_pipe[0]);
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xclose (exit_pipe[1]);
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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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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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_exit (1);
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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 ("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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if (unshare (CLONE_NEWNS | CLONE_NEWPID) < 0)
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FAIL_UNSUPPORTED ("could not enter new PID namespace");
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pid = xfork (); /* inner child */
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if (pid == 0)
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{
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xclose (pid_pipe[1]);
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/* wait until the outer child has exited */
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char c;
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VERIFY (read (exit_pipe[0], &c, 1) == 0);
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xclose (exit_pipe[0]);
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if (mount ("proc", "/proc", "proc",
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MS_NOSUID|MS_NOEXEC|MS_NODEV, NULL) != 0)
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{
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/* This happens if we're trying to create a nested container,
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like if the build is running under podman, and we lack
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priviledges. */
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if (errno == EPERM)
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_exit (EXIT_UNSUPPORTED);
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else
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_exit (EXIT_FAILURE);
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}
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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, strrchr (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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_exit (WEXITSTATUS (status));
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}
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xclose (pid_pipe[1]);
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xclose (exit_pipe[0]);
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xclose (exit_pipe[1]);
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/* wait for the outer child */
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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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int ret = WEXITSTATUS (status);
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if (ret != 0)
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FAIL_UNSUPPORTED ("unable to mount /proc on inner child process");
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xclose (pid_pipe[0]);
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return 0;
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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_2 (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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