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2714c5f3 | 1 | /* Return true if the process can perform a chroot operation. |
d614a753 | 2 | Copyright (C) 2017-2020 Free Software Foundation, Inc. |
2714c5f3 FW |
3 | This file is part of the GNU C Library. |
4 | ||
5 | The GNU C Library is free software; you can redistribute it and/or | |
6 | modify it under the terms of the GNU Lesser General Public | |
7 | License as published by the Free Software Foundation; either | |
8 | version 2.1 of the License, or (at your option) any later version. | |
9 | ||
10 | The GNU C Library is distributed in the hope that it will be useful, | |
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
13 | Lesser General Public License for more details. | |
14 | ||
15 | You should have received a copy of the GNU Lesser General Public | |
16 | License along with the GNU C Library; if not, see | |
5a82c748 | 17 | <https://www.gnu.org/licenses/>. */ |
2714c5f3 FW |
18 | |
19 | #include <errno.h> | |
20 | #include <stdio.h> | |
21 | #include <support/check.h> | |
22 | #include <support/namespace.h> | |
23 | #include <support/support.h> | |
f58bd7f0 | 24 | #include <support/xunistd.h> |
2714c5f3 FW |
25 | #include <sys/stat.h> |
26 | #include <unistd.h> | |
2714c5f3 FW |
27 | |
28 | static void | |
29 | callback (void *closure) | |
30 | { | |
31 | int *result = closure; | |
32 | struct stat64 before; | |
33 | xstat ("/dev", &before); | |
34 | if (chroot ("/dev") != 0) | |
35 | { | |
36 | *result = errno; | |
37 | return; | |
38 | } | |
39 | struct stat64 after; | |
40 | xstat ("/", &after); | |
41 | TEST_VERIFY (before.st_dev == after.st_dev); | |
42 | TEST_VERIFY (before.st_ino == after.st_ino); | |
43 | *result = 0; | |
44 | } | |
45 | ||
46 | bool | |
47 | support_can_chroot (void) | |
48 | { | |
49 | int *result = support_shared_allocate (sizeof (*result)); | |
50 | *result = 0; | |
51 | support_isolate_in_subprocess (callback, result); | |
52 | bool ok = *result == 0; | |
53 | if (!ok) | |
54 | { | |
55 | static bool already_warned; | |
56 | if (!already_warned) | |
57 | { | |
58 | already_warned = true; | |
59 | errno = *result; | |
60 | printf ("warning: this process does not support chroot: %m\n"); | |
61 | } | |
62 | } | |
63 | support_shared_free (result); | |
64 | return ok; | |
65 | } |