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dff8da6b | 1 | /* Copyright (C) 1991-2024 Free Software Foundation, Inc. |
ebbad4cc | 2 | This file is part of the GNU C Library. |
28f540f4 | 3 | |
ebbad4cc | 4 | The GNU C Library is free software; you can redistribute it and/or |
41bdb6e2 AJ |
5 | modify it under the terms of the GNU Lesser General Public |
6 | License as published by the Free Software Foundation; either | |
7 | version 2.1 of the License, or (at your option) any later version. | |
28f540f4 | 8 | |
ebbad4cc UD |
9 | The GNU C Library is distributed in the hope that it will be useful, |
10 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
41bdb6e2 | 12 | Lesser General Public License for more details. |
28f540f4 | 13 | |
41bdb6e2 | 14 | You should have received a copy of the GNU Lesser General Public |
59ba27a6 | 15 | License along with the GNU C Library; if not, see |
5a82c748 | 16 | <https://www.gnu.org/licenses/>. */ |
28f540f4 | 17 | |
db11c38c | 18 | #include <string.h> |
28f540f4 | 19 | #include <unistd.h> |
db11c38c | 20 | |
28f540f4 | 21 | #include <hurd.h> |
28f540f4 RM |
22 | #include <hurd/port.h> |
23 | ||
db11c38c MK |
24 | /* Make PATH be the root directory (the starting point for absolute |
25 | paths). Note that while on traditional UNIX systems this call is | |
26 | restricted to the super-user, it isn't on the Hurd. */ | |
28f540f4 | 27 | int |
db11c38c | 28 | chroot (const char *path) |
28f540f4 | 29 | { |
db11c38c MK |
30 | const char *lookup; |
31 | size_t len; | |
32 | file_t dir, root; | |
33 | error_t err; | |
34 | ||
35 | /* Append trailing "/." to directory name to force ENOTDIR if it's not a | |
36 | directory and EACCES if we don't have search permission. */ | |
37 | len = strlen (path); | |
ab7dd85b | 38 | if (len >= 2 && path[len - 2] == '/' && path[len - 1] == '.') |
db11c38c | 39 | lookup = path; |
edadcbd6 ST |
40 | else if (len == 0) |
41 | /* Special-case empty file name according to POSIX. */ | |
42 | return __hurd_fail (ENOENT); | |
db11c38c MK |
43 | else |
44 | { | |
ab7dd85b | 45 | char *n = alloca (len + 3); |
db11c38c MK |
46 | memcpy (n, path, len); |
47 | n[len] = '/'; | |
48 | n[len + 1] = '.'; | |
49 | n[len + 2] = '\0'; | |
50 | lookup = n; | |
51 | } | |
52 | ||
53 | dir = __file_name_lookup (lookup, 0, 0); | |
54 | if (dir == MACH_PORT_NULL) | |
55 | return -1; | |
56 | ||
57 | /* Prevent going through DIR's .. */ | |
58 | err = __file_reparent (dir, MACH_PORT_NULL, &root); | |
59 | __mach_port_deallocate (__mach_task_self (), dir); | |
60 | if (err) | |
61 | return __hurd_fail (err); | |
62 | ||
63 | _hurd_port_set (&_hurd_ports[INIT_PORT_CRDIR], root); | |
64 | return 0; | |
28f540f4 | 65 | } |