6 * Copyright (C) 2003 Greg Kroah-Hartman <greg@kroah.com>
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.
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.
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.
34 #include "udev_version.h"
39 static int delete_path(char *path)
44 pos = strrchr(path, '/');
47 pos = strrchr(path, '/');
49 /* don't remove the last one */
50 if ((pos == path) || (pos == NULL))
58 if (errno == ENOTEMPTY)
60 dbg("rmdir(%s) failed with error '%s'",
61 path, strerror(errno));
64 dbg("removed '%s'", path);
69 /** Remove all permissions on the device node, before
70 * unlinking it. This fixes a security issue.
71 * If the user created a hard-link to the device node,
72 * he can't use it any longer, because he lost permission
75 static int secure_unlink(const char *filename)
79 retval = chown(filename, 0, 0);
81 dbg("chown(%s, 0, 0) failed with error '%s'",
82 filename, strerror(errno));
83 /* We continue nevertheless.
84 * I think it's very unlikely for chown
85 * to fail here, if the file exists.
88 retval = chmod(filename, 0000);
90 dbg("chmod(%s, 0000) failed with error '%s'",
91 filename, strerror(errno));
92 /* We continue nevertheless. */
94 retval = unlink(filename);
98 dbg("unlink(%s) failed with error '%s'",
99 filename, strerror(errno));
104 static int delete_node(struct udevice *dev)
106 char filename[NAME_SIZE];
107 char linkname[NAME_SIZE];
108 char partitionname[NAME_SIZE];
115 strfieldcpy(filename, udev_root);
116 strfieldcat(filename, dev->name);
118 info("removing device node '%s'", filename);
119 retval = secure_unlink(filename);
123 /* remove all_partitions nodes */
124 num = dev->partitions;
126 info("removing all_partitions '%s[1-%i]'", filename, num);
127 if (num > PARTITIONS_COUNT) {
128 info("garbage from udev database, skip all_partitions removal");
131 for (i = 1; i <= num; i++) {
132 strfieldcpy(partitionname, filename);
133 strintcat(partitionname, i);
134 secure_unlink(partitionname);
138 /* remove subdirectories */
139 if (strchr(dev->name, '/'))
140 delete_path(filename);
142 foreach_strpart(dev->symlink, " ", pos, len) {
143 strfieldcpymax(linkname, pos, len+1);
144 strfieldcpy(filename, udev_root);
145 strfieldcat(filename, linkname);
147 dbg("unlinking symlink '%s'", filename);
148 retval = unlink(filename);
152 dbg("unlink(%s) failed with error '%s'",
153 filename, strerror(errno));
156 if (strchr(dev->symlink, '/')) {
157 delete_path(filename);
165 * look up the sysfs path in the database to get the node name to remove
166 * If we can't find it, use kernel name for lack of anything else to know to do
168 int udev_remove_device(struct udevice *udev)
170 struct udevice db_dev;
174 memset(&db_dev, 0x00, sizeof(struct udevice));
176 retval = udevdb_get_dev(udev->devpath, &db_dev);
178 /* get stored values in our device */
179 memcpy(udev, &db_dev, UDEVICE_DB_LEN);
181 /* fall back to kernel name */
182 temp = strrchr(udev->devpath, '/');
185 strfieldcpy(udev->name, &temp[1]);
186 dbg("'%s' not found in database, falling back on default name", udev->name);
188 dbg("remove name='%s'", udev->name);
191 udevdb_delete_dev(udev->devpath);
193 if (udev->type == 'b' || udev->type == 'c')
194 retval = delete_node(udev);