66 lines
2.0 KiB
C
66 lines
2.0 KiB
C
|
/* Copyright (C) 1991-2022 Free Software Foundation, Inc.
|
||
|
|
This file is part of the GNU C Library.
|
||
|
|
|
||
|
|
The GNU C Library is free software; you can redistribute it and/or
|
||
|
|
modify it under the terms of the GNU Lesser General Public
|
||
|
|
License as published by the Free Software Foundation; either
|
||
|
|
version 2.1 of the License, or (at your option) any later version.
|
||
|
|
|
||
|
|
The GNU C Library is distributed in the hope that it will be useful,
|
||
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
||
|
|
Lesser General Public License for more details.
|
||
|
|
|
||
|
|
You should have received a copy of the GNU Lesser General Public
|
||
|
|
License along with the GNU C Library; if not, see
|
||
|
|
<https://www.gnu.org/licenses/>. */
|
||
|
|
|
||
|
|
#include <string.h>
|
||
|
|
#include <unistd.h>
|
||
|
|
|
||
|
|
#include <hurd.h>
|
||
|
|
#include <hurd/port.h>
|
||
|
|
|
||
|
|
/* Make PATH be the root directory (the starting point for absolute
|
||
|
|
paths). Note that while on traditional UNIX systems this call is
|
||
|
|
restricted to the super-user, it isn't on the Hurd. */
|
||
|
|
int
|
||
|
|
chroot (const char *path)
|
||
|
|
{
|
||
|
|
const char *lookup;
|
||
|
|
size_t len;
|
||
|
|
file_t dir, root;
|
||
|
|
error_t err;
|
||
|
|
|
||
|
|
/* Append trailing "/." to directory name to force ENOTDIR if it's not a
|
||
|
|
directory and EACCES if we don't have search permission. */
|
||
|
|
len = strlen (path);
|
||
|
|
if (len >= 2 && path[len - 2] == '/' && path[len - 1] == '.')
|
||
|
|
lookup = path;
|
||
|
|
else if (len == 0)
|
||
|
|
/* Special-case empty file name according to POSIX. */
|
||
|
|
return __hurd_fail (ENOENT);
|
||
|
|
else
|
||
|
|
{
|
||
|
|
char *n = alloca (len + 3);
|
||
|
|
memcpy (n, path, len);
|
||
|
|
n[len] = '/';
|
||
|
|
n[len + 1] = '.';
|
||
|
|
n[len + 2] = '\0';
|
||
|
|
lookup = n;
|
||
|
|
}
|
||
|
|
|
||
|
|
dir = __file_name_lookup (lookup, 0, 0);
|
||
|
|
if (dir == MACH_PORT_NULL)
|
||
|
|
return -1;
|
||
|
|
|
||
|
|
/* Prevent going through DIR's .. */
|
||
|
|
err = __file_reparent (dir, MACH_PORT_NULL, &root);
|
||
|
|
__mach_port_deallocate (__mach_task_self (), dir);
|
||
|
|
if (err)
|
||
|
|
return __hurd_fail (err);
|
||
|
|
|
||
|
|
_hurd_port_set (&_hurd_ports[INIT_PORT_CRDIR], root);
|
||
|
|
return 0;
|
||
|
|
}
|