617 lines
18 KiB
C
617 lines
18 KiB
C
/* Copyright (C) 2017-2022 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 <dirent.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <limits.h>
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#include <sched.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/mount.h>
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#include <sys/prctl.h>
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#include <sys/stat.h>
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#include <sys/wait.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/namespace.h>
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#include <support/support.h>
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#include <support/temp_file.h>
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#include <support/test-driver.h>
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#include <support/xunistd.h>
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/* generic utilities */
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#define VERIFY(expr) \
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do { \
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if (!(expr)) \
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{ \
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printf ("error: %s:%d: %s: %m\n", \
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__FILE__, __LINE__, #expr); \
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exit (1); \
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} \
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} while (0)
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static void
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touch (const char *path, mode_t mode)
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{
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xclose (xopen (path, O_WRONLY|O_CREAT|O_NOCTTY, mode));
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}
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static size_t
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trim_prefix (char *str, size_t str_len, const char *prefix)
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{
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size_t prefix_len = strlen (prefix);
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if (str_len > prefix_len && memcmp (str, prefix, prefix_len) == 0)
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{
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memmove (str, str + prefix_len, str_len - prefix_len);
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return str_len - prefix_len;
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}
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return str_len;
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}
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/* returns a pointer to static storage */
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static char *
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proc_fd_readlink (const char *linkname)
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{
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static char target[PATH_MAX+1];
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ssize_t target_len = readlink (linkname, target, PATH_MAX);
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VERIFY (target_len > 0);
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target_len = trim_prefix (target, target_len, "(unreachable)");
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target[target_len] = '\0';
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return target;
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}
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/* plain ttyname runner */
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struct result
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{
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const char *name;
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int err;
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};
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/* strings in result structure are in static storage */
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static struct result
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run_ttyname (int fd)
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{
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struct result ret;
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errno = 0;
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ret.name = ttyname (fd);
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ret.err = errno;
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return ret;
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}
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static bool
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eq_ttyname (struct result actual, struct result expected)
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{
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char *actual_name, *expected_name;
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if ((actual.err == expected.err)
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&& (!actual.name == !expected.name)
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&& (actual.name ? strcmp (actual.name, expected.name) == 0 : true))
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{
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if (expected.name)
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expected_name = xasprintf ("\"%s\"", expected.name);
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else
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expected_name = xstrdup ("NULL");
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printf ("info: ttyname: PASS {name=%s, errno=%d}\n",
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expected_name, expected.err);
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free (expected_name);
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return true;
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}
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if (actual.name)
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actual_name = xasprintf ("\"%s\"", actual.name);
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else
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actual_name = xstrdup ("NULL");
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if (expected.name)
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expected_name = xasprintf ("\"%s\"", expected.name);
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else
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expected_name = xstrdup ("NULL");
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printf ("error: ttyname: actual {name=%s, errno=%d} != expected {name=%s, errno=%d}\n",
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actual_name, actual.err,
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expected_name, expected.err);
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free (actual_name);
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free (expected_name);
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return false;
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}
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/* ttyname_r runner */
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struct result_r
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{
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const char *name;
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int ret;
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int err;
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};
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/* strings in result structure are in static storage */
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static struct result_r
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run_ttyname_r (int fd)
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{
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static char buf[TTY_NAME_MAX];
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struct result_r ret;
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errno = 0;
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ret.ret = ttyname_r (fd, buf, TTY_NAME_MAX);
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ret.err = errno;
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if (ret.ret == 0)
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ret.name = buf;
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else
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ret.name = NULL;
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return ret;
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}
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static bool
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eq_ttyname_r (struct result_r actual, struct result_r expected)
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{
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char *actual_name, *expected_name;
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if ((actual.err == expected.err)
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&& (actual.ret == expected.ret)
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&& (!actual.name == !expected.name)
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&& (actual.name ? strcmp (actual.name, expected.name) == 0 : true))
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{
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if (expected.name)
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expected_name = xasprintf ("\"%s\"", expected.name);
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else
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expected_name = xstrdup ("NULL");
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printf ("info: ttyname_r: PASS {name=%s, ret=%d, errno=%d}\n",
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expected_name, expected.ret, expected.err);
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free (expected_name);
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return true;
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}
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if (actual.name)
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actual_name = xasprintf ("\"%s\"", actual.name);
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else
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actual_name = xstrdup ("NULL");
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if (expected.name)
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expected_name = xasprintf ("\"%s\"", expected.name);
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else
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expected_name = xstrdup ("NULL");
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printf ("error: ttyname_r: actual {name=%s, ret=%d, errno=%d} != expected {name=%s, ret=%d, errno=%d}\n",
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actual_name, actual.ret, actual.err,
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expected_name, expected.ret, expected.err);
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free (actual_name);
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free (expected_name);
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return false;
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}
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/* combined runner */
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static bool
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doit (int fd, const char *testname, struct result_r expected_r)
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{
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struct result expected = {.name=expected_r.name, .err=expected_r.ret};
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bool ret = true;
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printf ("info: testcase: %s\n", testname);
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if (!eq_ttyname (run_ttyname (fd), expected))
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ret = false;
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if (!eq_ttyname_r (run_ttyname_r (fd), expected_r))
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ret = false;
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if (!ret)
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support_record_failure ();
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return ret;
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}
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/* chroot setup */
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static char *chrootdir;
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static void
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prepare (int argc, char **argv)
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{
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chrootdir = xasprintf ("%s/tst-ttyname-XXXXXX", test_dir);
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if (mkdtemp (chrootdir) == NULL)
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FAIL_EXIT1 ("mkdtemp (\"%s\"): %m", chrootdir);
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add_temp_file (chrootdir);
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}
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#define PREPARE prepare
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/* Adjust the file limit so that we have a chance to open PTY. */
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static void
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adjust_file_limit (const char *pty)
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{
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int number = -1;
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if (sscanf (pty, "/dev/pts/%d", &number) != 1 || number < 0)
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FAIL_EXIT1 ("invalid PTY name: \"%s\"", pty);
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/* Add a few additional descriptors to cover standard I/O streams
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etc. */
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rlim_t desired_limit = number + 10;
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struct rlimit lim;
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if (getrlimit (RLIMIT_NOFILE, &lim) != 0)
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FAIL_EXIT1 ("getrlimit (RLIMIT_NOFILE): %m");
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if (lim.rlim_cur < desired_limit)
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{
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printf ("info: adjusting RLIMIT_NOFILE from %llu to %llu\n",
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(unsigned long long int) lim.rlim_cur,
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(unsigned long long int) desired_limit);
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lim.rlim_cur = desired_limit;
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if (setrlimit (RLIMIT_NOFILE, &lim) != 0)
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printf ("warning: setrlimit (RLIMIT_NOFILE) failed: %m\n");
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}
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}
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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_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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VERIFY (mount ("proc", "/proc", "proc",
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MS_NOSUID|MS_NOEXEC|MS_NODEV, NULL) == 0);
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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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xwrite (pid_pipe[1], &pid, sizeof pid);
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_exit (0);
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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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return ret;
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/* set 'pid' to the inner child */
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VERIFY (read (pid_pipe[0], &pid, sizeof pid) == sizeof pid);
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xclose (pid_pipe[0]);
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/* wait for the inner child */
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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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return WEXITSTATUS (status);
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}
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/* main test */
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static int
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run_chroot_tests (const char *slavename, int slave)
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{
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struct stat st;
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bool ok = true;
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/* There are 3 groups of tests here. The first group fairly
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generically does things known to mess up ttyname, and verifies
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that ttyname copes correctly. The remaining groups are
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increasingly convoluted, as we target specific parts of ttyname
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to try to confuse. */
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/* Basic tests that it doesn't get confused by multiple devpts
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instances. */
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{
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VERIFY (stat (slavename, &st) < 0); /* sanity check */
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if (!doit (slave, "no conflict, no match",
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(struct result_r){.name=NULL, .ret=ENODEV, .err=ENODEV}))
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ok = false;
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VERIFY (mount ("/console", "/dev/console", NULL, MS_BIND, NULL) == 0);
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if (!doit (slave, "no conflict, console",
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(struct result_r){.name="/dev/console", .ret=0, .err=0}))
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ok = false;
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VERIFY (umount ("/dev/console") == 0);
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/* Keep creating PTYs until we we get a name collision. */
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while (true)
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{
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if (stat (slavename, &st) == 0)
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break;
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if (posix_openpt (O_RDWR|O_NOCTTY|O_NONBLOCK) < 0)
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{
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if (errno == ENOSPC || errno == EMFILE || errno == ENFILE)
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FAIL_UNSUPPORTED ("cannot re-create PTY \"%s\" in chroot: %m"
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" (consider increasing limits)", slavename);
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else
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FAIL_EXIT1 ("cannot re-create PTY \"%s\" chroot: %m", slavename);
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}
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}
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if (!doit (slave, "conflict, no match",
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(struct result_r){.name=NULL, .ret=ENODEV, .err=ENODEV}))
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ok = false;
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VERIFY (mount ("/console", "/dev/console", NULL, MS_BIND, NULL) == 0);
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if (!doit (slave, "conflict, console",
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(struct result_r){.name="/dev/console", .ret=0, .err=0}))
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ok = false;
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VERIFY (umount ("/dev/console") == 0);
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}
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/* The first tests kinda assumed that they hit certain code-paths
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based on assuming that the readlink target is 'slavename', but
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that's not quite always true. They're still a good preliminary
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sanity check, so keep them, but let's add tests that make sure
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that those code-paths are hit by doing a readlink ourself. */
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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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free (linkname);
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/* Depeding on how we set up the chroot, the kernel may or may not
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trim the leading path to the target (it may give us "/6",
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instead of "/dev/pts/6"). We test it both ways (do_in_chroot_1
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and do_in_chroot_2). This test group relies on the target
|
|
existing, so guarantee that it does exist by creating it if
|
|
necessary. */
|
|
if (stat (target, &st) < 0)
|
|
{
|
|
VERIFY (errno == ENOENT);
|
|
touch (target, 0);
|
|
}
|
|
|
|
VERIFY (mount ("/console", "/dev/console", NULL, MS_BIND, NULL) == 0);
|
|
VERIFY (mount ("/console", target, NULL, MS_BIND, NULL) == 0);
|
|
if (!doit (slave, "with readlink target",
|
|
(struct result_r){.name=target, .ret=0, .err=0}))
|
|
ok = false;
|
|
VERIFY (umount (target) == 0);
|
|
VERIFY (umount ("/dev/console") == 0);
|
|
|
|
VERIFY (mount ("/console", "/dev/console", NULL, MS_BIND, NULL) == 0);
|
|
VERIFY (mount (slavename, target, NULL, MS_BIND, NULL) == 0);
|
|
if (!doit (slave, "with readlink trap; fallback",
|
|
(struct result_r){.name="/dev/console", .ret=0, .err=0}))
|
|
ok = false;
|
|
VERIFY (umount (target) == 0);
|
|
VERIFY (umount ("/dev/console") == 0);
|
|
|
|
VERIFY (mount (slavename, target, NULL, MS_BIND, NULL) == 0);
|
|
if (!doit (slave, "with readlink trap; no fallback",
|
|
(struct result_r){.name=NULL, .ret=ENODEV, .err=ENODEV}))
|
|
ok = false;
|
|
VERIFY (umount (target) == 0);
|
|
}
|
|
|
|
/* This test makes sure that everything still works OK if readdir
|
|
finds a pseudo-match before and/or after the actual match. Now,
|
|
to do that, we need to control that readdir finds the
|
|
pseudo-matches before and after the actual match; and there's no
|
|
good way to control that order in absence of whitebox testing.
|
|
So, just create 3 files, then use opendir/readdir to see what
|
|
order they are in, and assign meaning based on that order, not by
|
|
name; assigning the first to be a pseudo-match, the second to be
|
|
the actual match, and the third to be a pseudo-match. This
|
|
assumes that (on tmpfs) ordering within the directory is stable
|
|
in the absence of modification, which seems reasonably safe. */
|
|
{
|
|
/* since we're testing the fallback search, disable the readlink
|
|
happy-path */
|
|
VERIFY (umount2 ("/proc", MNT_DETACH) == 0);
|
|
|
|
touch ("/dev/console1", 0);
|
|
touch ("/dev/console2", 0);
|
|
touch ("/dev/console3", 0);
|
|
|
|
char *c[3];
|
|
int ci = 0;
|
|
DIR *dirstream = opendir ("/dev");
|
|
VERIFY (dirstream != NULL);
|
|
struct dirent *d;
|
|
while ((d = readdir (dirstream)) != NULL && ci < 3)
|
|
{
|
|
if (strcmp (d->d_name, "console1")
|
|
&& strcmp (d->d_name, "console2")
|
|
&& strcmp (d->d_name, "console3") )
|
|
continue;
|
|
c[ci++] = xasprintf ("/dev/%s", d->d_name);
|
|
}
|
|
VERIFY (ci == 3);
|
|
VERIFY (closedir (dirstream) == 0);
|
|
|
|
VERIFY (mount (slavename, c[0], NULL, MS_BIND, NULL) == 0);
|
|
VERIFY (mount ("/console", c[1], NULL, MS_BIND, NULL) == 0);
|
|
VERIFY (mount (slavename, c[2], NULL, MS_BIND, NULL) == 0);
|
|
VERIFY (umount2 ("/dev/pts", MNT_DETACH) == 0);
|
|
if (!doit (slave, "with search-path trap",
|
|
(struct result_r){.name=c[1], .ret=0, .err=0}))
|
|
ok = false;
|
|
for (int i = 0; i < 3; i++)
|
|
{
|
|
VERIFY (umount (c[i]) == 0);
|
|
VERIFY (unlink (c[i]) == 0);
|
|
free (c[i]);
|
|
}
|
|
}
|
|
|
|
return ok ? 0 : 1;
|
|
}
|
|
|
|
static int
|
|
do_test (void)
|
|
{
|
|
support_become_root ();
|
|
|
|
int ret1 = do_in_chroot_1 (run_chroot_tests);
|
|
if (ret1 == EXIT_UNSUPPORTED)
|
|
return ret1;
|
|
|
|
int ret2 = do_in_chroot_2 (run_chroot_tests);
|
|
if (ret2 == EXIT_UNSUPPORTED)
|
|
return ret2;
|
|
|
|
return ret1 | ret2;
|
|
}
|
|
|
|
#include <support/test-driver.c>
|