[50f32b11] | 1 | /* |
---|
[37535317] | 2 | * chroot() - Change Root Directory |
---|
| 3 | * Author: fernando.ruiz@ctv.es |
---|
| 4 | * |
---|
[46dfa1c] | 5 | * COPYRIGHT (c) 1989-2008. |
---|
[37535317] | 6 | * On-Line Applications Research Corporation (OAR). |
---|
| 7 | * |
---|
[3b7c123] | 8 | * Modifications to support reference counting in the file system are |
---|
| 9 | * Copyright (c) 2012 embedded brains GmbH. |
---|
| 10 | * |
---|
[37535317] | 11 | * The license and distribution terms for this file may be |
---|
| 12 | * found in the file LICENSE in this distribution or at |
---|
[0eae36c7] | 13 | * http://www.rtems.com/license/LICENSE. |
---|
[37535317] | 14 | */ |
---|
| 15 | |
---|
| 16 | #if HAVE_CONFIG_H |
---|
[3b7c123] | 17 | #include "config.h" |
---|
[37535317] | 18 | #endif |
---|
| 19 | |
---|
| 20 | #include <unistd.h> |
---|
| 21 | |
---|
| 22 | #include <rtems/libio_.h> |
---|
| 23 | |
---|
[3b7c123] | 24 | int chroot( const char *path ) |
---|
[37535317] | 25 | { |
---|
[3b7c123] | 26 | int rv = 0; |
---|
| 27 | rtems_status_code sc = RTEMS_SUCCESSFUL; |
---|
| 28 | rtems_filesystem_eval_path_context_t ctx; |
---|
[2563410] | 29 | int eval_flags = RTEMS_FS_PERMS_EXEC |
---|
| 30 | | RTEMS_FS_FOLLOW_LINK; |
---|
[3b7c123] | 31 | rtems_filesystem_location_info_t loc; |
---|
| 32 | rtems_filesystem_global_location_t *new_current_loc; |
---|
| 33 | |
---|
| 34 | /* |
---|
| 35 | * We use the global environment for path evaluation. This makes it possible |
---|
| 36 | * to escape from a chroot environment referencing an unmounted file system. |
---|
| 37 | */ |
---|
| 38 | rtems_filesystem_eval_path_start_with_root_and_current( |
---|
| 39 | &ctx, |
---|
| 40 | path, |
---|
| 41 | eval_flags, |
---|
| 42 | &rtems_global_user_env.root_directory, |
---|
| 43 | &rtems_global_user_env.current_directory |
---|
| 44 | ); |
---|
[37535317] | 45 | |
---|
[3b7c123] | 46 | rtems_filesystem_eval_path_extract_currentloc( &ctx, &loc ); |
---|
| 47 | new_current_loc = rtems_filesystem_location_transform_to_global( &loc ); |
---|
| 48 | if ( !rtems_filesystem_global_location_is_null( new_current_loc ) ) { |
---|
| 49 | rtems_filesystem_global_location_t *new_root_loc = |
---|
| 50 | rtems_filesystem_global_location_obtain( &new_current_loc ); |
---|
| 51 | rtems_filesystem_node_types_t type = |
---|
[da154e14] | 52 | (*new_root_loc->location.mt_entry->ops->node_type_h)( |
---|
| 53 | &new_root_loc->location |
---|
| 54 | ); |
---|
[3b7c123] | 55 | |
---|
| 56 | if ( type == RTEMS_FILESYSTEM_DIRECTORY ) { |
---|
| 57 | sc = rtems_libio_set_private_env(); |
---|
| 58 | if (sc == RTEMS_SUCCESSFUL) { |
---|
| 59 | rtems_filesystem_global_location_assign( |
---|
| 60 | &rtems_filesystem_root, |
---|
| 61 | new_root_loc |
---|
| 62 | ); |
---|
| 63 | rtems_filesystem_global_location_assign( |
---|
| 64 | &rtems_filesystem_current, |
---|
| 65 | new_current_loc |
---|
| 66 | ); |
---|
| 67 | } else { |
---|
| 68 | if (sc != RTEMS_UNSATISFIED) { |
---|
| 69 | errno = ENOMEM; |
---|
| 70 | } |
---|
| 71 | rv = -1; |
---|
| 72 | } |
---|
| 73 | } else { |
---|
| 74 | rtems_filesystem_location_error( &new_root_loc->location, ENOTDIR ); |
---|
| 75 | rv = -1; |
---|
| 76 | } |
---|
| 77 | |
---|
| 78 | if ( rv != 0 ) { |
---|
| 79 | rtems_filesystem_global_location_release( new_root_loc ); |
---|
| 80 | } |
---|
| 81 | } else { |
---|
| 82 | rv = -1; |
---|
[46dfa1c] | 83 | } |
---|
| 84 | |
---|
[3b7c123] | 85 | rtems_filesystem_eval_path_cleanup( &ctx ); |
---|
| 86 | |
---|
| 87 | if ( rv != 0 ) { |
---|
| 88 | rtems_filesystem_global_location_release( new_current_loc ); |
---|
[d90b74e] | 89 | } |
---|
[37535317] | 90 | |
---|
[3b7c123] | 91 | return rv; |
---|
[37535317] | 92 | } |
---|