mirror of
https://gitlab.rtems.org/rtems/rtos/rtems.git
synced 2026-08-25 04:29:11 +08:00
Sebastian Huber
da154e14f6
The scope of the file system operations is the file system instance. The scope of the file system node handlers is the file location. The benefit of moving the operations to the mount table entry is a size reduction of the file location (rtems_filesystem_location_info_t). The code size is slightly increased due to additional load instructions. Restructure rtems_filesystem_mount_table_entry_t to improve cache efficiency.
93 lines
2.5 KiB
C
93 lines
2.5 KiB
C
/*
|
|
* chroot() - Change Root Directory
|
|
* Author: fernando.ruiz@ctv.es
|
|
*
|
|
* COPYRIGHT (c) 1989-2008.
|
|
* On-Line Applications Research Corporation (OAR).
|
|
*
|
|
* Modifications to support reference counting in the file system are
|
|
* Copyright (c) 2012 embedded brains GmbH.
|
|
*
|
|
* The license and distribution terms for this file may be
|
|
* found in the file LICENSE in this distribution or at
|
|
* http://www.rtems.com/license/LICENSE.
|
|
*/
|
|
|
|
#if HAVE_CONFIG_H
|
|
#include "config.h"
|
|
#endif
|
|
|
|
#include <unistd.h>
|
|
|
|
#include <rtems/libio_.h>
|
|
|
|
int chroot( const char *path )
|
|
{
|
|
int rv = 0;
|
|
rtems_status_code sc = RTEMS_SUCCESSFUL;
|
|
rtems_filesystem_eval_path_context_t ctx;
|
|
int eval_flags = RTEMS_FS_PERMS_EXEC
|
|
| RTEMS_FS_FOLLOW_LINK;
|
|
rtems_filesystem_location_info_t loc;
|
|
rtems_filesystem_global_location_t *new_current_loc;
|
|
|
|
/*
|
|
* We use the global environment for path evaluation. This makes it possible
|
|
* to escape from a chroot environment referencing an unmounted file system.
|
|
*/
|
|
rtems_filesystem_eval_path_start_with_root_and_current(
|
|
&ctx,
|
|
path,
|
|
eval_flags,
|
|
&rtems_global_user_env.root_directory,
|
|
&rtems_global_user_env.current_directory
|
|
);
|
|
|
|
rtems_filesystem_eval_path_extract_currentloc( &ctx, &loc );
|
|
new_current_loc = rtems_filesystem_location_transform_to_global( &loc );
|
|
if ( !rtems_filesystem_global_location_is_null( new_current_loc ) ) {
|
|
rtems_filesystem_global_location_t *new_root_loc =
|
|
rtems_filesystem_global_location_obtain( &new_current_loc );
|
|
rtems_filesystem_node_types_t type =
|
|
(*new_root_loc->location.mt_entry->ops->node_type_h)(
|
|
&new_root_loc->location
|
|
);
|
|
|
|
if ( type == RTEMS_FILESYSTEM_DIRECTORY ) {
|
|
sc = rtems_libio_set_private_env();
|
|
if (sc == RTEMS_SUCCESSFUL) {
|
|
rtems_filesystem_global_location_assign(
|
|
&rtems_filesystem_root,
|
|
new_root_loc
|
|
);
|
|
rtems_filesystem_global_location_assign(
|
|
&rtems_filesystem_current,
|
|
new_current_loc
|
|
);
|
|
} else {
|
|
if (sc != RTEMS_UNSATISFIED) {
|
|
errno = ENOMEM;
|
|
}
|
|
rv = -1;
|
|
}
|
|
} else {
|
|
rtems_filesystem_location_error( &new_root_loc->location, ENOTDIR );
|
|
rv = -1;
|
|
}
|
|
|
|
if ( rv != 0 ) {
|
|
rtems_filesystem_global_location_release( new_root_loc );
|
|
}
|
|
} else {
|
|
rv = -1;
|
|
}
|
|
|
|
rtems_filesystem_eval_path_cleanup( &ctx );
|
|
|
|
if ( rv != 0 ) {
|
|
rtems_filesystem_global_location_release( new_current_loc );
|
|
}
|
|
|
|
return rv;
|
|
}
|