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Commit | Line | Data |
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ea733a2f GKH |
1 | /* |
2 | * udev-remove.c | |
3 | * | |
4 | * Userspace devfs | |
5 | * | |
6 | * Copyright (C) 2003 Greg Kroah-Hartman <greg@kroah.com> | |
7 | * | |
8 | * | |
9 | * This program is free software; you can redistribute it and/or modify it | |
10 | * under the terms of the GNU General Public License as published by the | |
11 | * Free Software Foundation version 2 of the License. | |
12 | * | |
13 | * This program is distributed in the hope that it will be useful, but | |
14 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
16 | * General Public License for more details. | |
17 | * | |
18 | * You should have received a copy of the GNU General Public License along | |
19 | * with this program; if not, write to the Free Software Foundation, Inc., | |
20 | * 675 Mass Ave, Cambridge, MA 02139, USA. | |
21 | * | |
22 | */ | |
23 | ||
24 | #include <stdlib.h> | |
25 | #include <string.h> | |
26 | #include <stdio.h> | |
27 | #include <fcntl.h> | |
28 | #include <unistd.h> | |
29 | #include <errno.h> | |
30 | ||
31 | #include "udev.h" | |
c81b35c0 | 32 | #include "udev_lib.h" |
ea733a2f | 33 | #include "udev_version.h" |
54988802 | 34 | #include "logging.h" |
ea733a2f | 35 | #include "namedev.h" |
8e41d35d | 36 | #include "udevdb.h" |
ea733a2f | 37 | |
3d150dfb | 38 | static int delete_path(char *path) |
ea733a2f | 39 | { |
3d150dfb KS |
40 | char *pos; |
41 | int retval; | |
ea733a2f | 42 | |
3d150dfb KS |
43 | pos = strrchr(path, '/'); |
44 | while (1) { | |
45 | *pos = '\0'; | |
46 | pos = strrchr(path, '/'); | |
47 | ||
48 | /* don't remove the last one */ | |
49 | if ((pos == path) || (pos == NULL)) | |
50 | break; | |
51 | ||
52 | /* remove if empty */ | |
53 | retval = rmdir(path); | |
92c5ddee MI |
54 | if (errno == ENOENT) |
55 | retval = 0; | |
3d150dfb KS |
56 | if (retval) { |
57 | if (errno == ENOTEMPTY) | |
58 | return 0; | |
59 | dbg("rmdir(%s) failed with error '%s'", | |
60 | path, strerror(errno)); | |
61 | break; | |
62 | } | |
63 | dbg("removed '%s'", path); | |
5840bc63 | 64 | } |
3d150dfb | 65 | return 0; |
ea733a2f GKH |
66 | } |
67 | ||
e2eef6d4 MB |
68 | /** Remove all permissions on the device node, before |
69 | * unlinking it. This fixes a security issue. | |
70 | * If the user created a hard-link to the device node, | |
71 | * he can't use it any longer, because he lost permission | |
72 | * to do so. | |
73 | */ | |
74 | static int secure_unlink(const char *filename) | |
75 | { | |
76 | int retval; | |
77 | ||
78 | retval = chown(filename, 0, 0); | |
79 | if (retval) { | |
80 | dbg("chown(%s, 0, 0) failed with error '%s'", | |
81 | filename, strerror(errno)); | |
82 | /* We continue nevertheless. | |
83 | * I think it's very unlikely for chown | |
84 | * to fail here, if the file exists. | |
85 | */ | |
86 | } | |
87 | retval = chmod(filename, 0000); | |
88 | if (retval) { | |
89 | dbg("chmod(%s, 0000) failed with error '%s'", | |
90 | filename, strerror(errno)); | |
91 | /* We continue nevertheless. */ | |
92 | } | |
93 | retval = unlink(filename); | |
94 | if (errno == ENOENT) | |
95 | retval = 0; | |
96 | if (retval) { | |
97 | dbg("unlink(%s) failed with error '%s'", | |
98 | filename, strerror(errno)); | |
99 | } | |
100 | return retval; | |
101 | } | |
102 | ||
3d150dfb | 103 | static int delete_node(struct udevice *dev) |
ea733a2f | 104 | { |
9fe3f9a9 KS |
105 | char filename[NAME_SIZE]; |
106 | char linkname[NAME_SIZE]; | |
107 | char partitionname[NAME_SIZE]; | |
218eae87 | 108 | int retval; |
50e5de03 | 109 | int i; |
ef672b3d KS |
110 | char *pos; |
111 | int len; | |
7e89a569 | 112 | int num; |
ea733a2f | 113 | |
c472e3c8 KS |
114 | strfieldcpy(filename, udev_root); |
115 | strfieldcat(filename, dev->name); | |
ea733a2f | 116 | |
54988802 | 117 | info("removing device node '%s'", filename); |
e2eef6d4 MB |
118 | retval = secure_unlink(filename); |
119 | if (retval) | |
218eae87 | 120 | return retval; |
218eae87 | 121 | |
7e89a569 KS |
122 | /* remove all_partitions nodes */ |
123 | num = dev->partitions; | |
124 | if (num > 0) { | |
125 | info("removing all_partitions '%s[1-%i]'", filename, num); | |
126 | if (num > PARTITIONS_COUNT) { | |
127 | info("garbage from udev database, skip all_partitions removal"); | |
128 | return -1; | |
129 | } | |
130 | for (i = 1; i <= num; i++) { | |
c58e36c0 KS |
131 | strfieldcpy(partitionname, filename); |
132 | strintcat(partitionname, i); | |
e2eef6d4 | 133 | secure_unlink(partitionname); |
50e5de03 KS |
134 | } |
135 | } | |
136 | ||
218eae87 | 137 | /* remove subdirectories */ |
3d150dfb KS |
138 | if (strchr(dev->name, '/')) |
139 | delete_path(filename); | |
140 | ||
9fe3f9a9 | 141 | foreach_strpart(dev->symlink, " ", pos, len) { |
17794d77 | 142 | strfieldcpymax(linkname, pos, len+1); |
9fe3f9a9 KS |
143 | strfieldcpy(filename, udev_root); |
144 | strfieldcat(filename, linkname); | |
145 | ||
146 | dbg("unlinking symlink '%s'", filename); | |
147 | retval = unlink(filename); | |
148 | if (errno == ENOENT) | |
149 | retval = 0; | |
150 | if (retval) { | |
151 | dbg("unlink(%s) failed with error '%s'", | |
152 | filename, strerror(errno)); | |
153 | return retval; | |
154 | } | |
155 | if (strchr(dev->symlink, '/')) { | |
156 | delete_path(filename); | |
218eae87 KS |
157 | } |
158 | } | |
3d150dfb | 159 | |
218eae87 | 160 | return retval; |
ea733a2f GKH |
161 | } |
162 | ||
3d150dfb KS |
163 | /* |
164 | * Look up the sysfs path in the database to see if we have named this device | |
165 | * something different from the kernel name. If we have, us it. If not, use | |
166 | * the default kernel name for lack of anything else to know to do. | |
167 | */ | |
eb6c7cd0 | 168 | int udev_remove_device(const char *path, const char *subsystem) |
ea733a2f | 169 | { |
808423c9 | 170 | struct udevice dev; |
3d150dfb | 171 | char *temp; |
a56ef382 KS |
172 | int retval; |
173 | ||
f61d732a | 174 | memset(&dev, 0x00, sizeof(dev)); |
ea733a2f | 175 | |
bbbe503e KS |
176 | retval = udevdb_get_dev(path, &dev); |
177 | if (retval != 0) { | |
178 | dbg("'%s' not found in database, falling back on default name", path); | |
179 | temp = strrchr(path, '/'); | |
180 | if (temp == NULL) | |
181 | return -ENODEV; | |
182 | strfieldcpy(dev.name, &temp[1]); | |
183 | } | |
184 | dbg("name='%s'", dev.name); | |
5aebfbcb | 185 | |
bbbe503e | 186 | dev.type = get_device_type(path, subsystem); |
9b28a52a | 187 | dev_d_send(&dev, subsystem, path); |
bbbe503e | 188 | udevdb_delete_dev(path); |
f61d732a | 189 | |
bbbe503e | 190 | if (dev.type == 'b' || dev.type == 'c') |
f61d732a | 191 | retval = delete_node(&dev); |
bbbe503e | 192 | else if (dev.type == 'n') |
f61d732a | 193 | retval = 0; |
7ac0feeb | 194 | |
a56ef382 | 195 | return retval; |
ea733a2f | 196 | } |