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.
35 #include "udev_version.h"
40 static int delete_path(const char *path)
45 pos = strrchr(path, '/');
48 pos = strrchr(path, '/');
50 /* don't remove the last one */
51 if ((pos == path) || (pos == NULL))
59 if (errno == ENOTEMPTY)
61 dbg("rmdir(%s) failed with error '%s'",
62 path, strerror(errno));
65 dbg("removed '%s'", path);
70 /** Remove all permissions on the device node, before
71 * unlinking it. This fixes a security issue.
72 * If the user created a hard-link to the device node,
73 * he can't use it any longer, because he lost permission
76 static int secure_unlink(const char *filename)
80 retval = chown(filename, 0, 0);
82 dbg("chown(%s, 0, 0) failed with error '%s'",
83 filename, strerror(errno));
84 /* We continue nevertheless.
85 * I think it's very unlikely for chown
86 * to fail here, if the file exists.
89 retval = chmod(filename, 0000);
91 dbg("chmod(%s, 0000) failed with error '%s'",
92 filename, strerror(errno));
93 /* We continue nevertheless. */
95 retval = unlink(filename);
99 dbg("unlink(%s) failed with error '%s'",
100 filename, strerror(errno));
105 static int delete_node(struct udevice *dev)
107 char filename[NAME_SIZE];
108 char linkname[NAME_SIZE];
109 char partitionname[NAME_SIZE];
116 strfieldcpy(filename, udev_root);
117 strfieldcat(filename, dev->name);
119 info("removing device node '%s'", filename);
120 retval = secure_unlink(filename);
124 /* remove all_partitions nodes */
125 num = dev->partitions;
127 info("removing all_partitions '%s[1-%i]'", filename, num);
128 if (num > PARTITIONS_COUNT) {
129 info("garbage from udev database, skip all_partitions removal");
132 for (i = 1; i <= num; i++) {
133 strfieldcpy(partitionname, filename);
134 strintcat(partitionname, i);
135 secure_unlink(partitionname);
139 /* remove subdirectories */
140 if (strchr(dev->name, '/'))
141 delete_path(filename);
143 foreach_strpart(dev->symlink, " ", pos, len) {
144 strfieldcpymax(linkname, pos, len+1);
145 strfieldcpy(filename, udev_root);
146 strfieldcat(filename, linkname);
148 dbg("unlinking symlink '%s'", filename);
149 retval = unlink(filename);
153 dbg("unlink(%s) failed with error '%s'",
154 filename, strerror(errno));
157 if (strchr(dev->symlink, '/')) {
158 delete_path(filename);
166 * look up the sysfs path in the database to get the node name to remove
167 * If we can't find it, use kernel name for lack of anything else to know to do
169 int udev_remove_device(struct udevice *udev)
171 struct udevice db_dev;
175 if (udev->type != 'b' && udev->type != 'c')
178 retval = udevdb_get_dev(udev->devpath, &db_dev);
180 /* copy over the stored values to our device */
181 memcpy(udev, &db_dev, UDEVICE_DB_LEN);
183 /* fall back to kernel name */
184 temp = strrchr(udev->devpath, '/');
187 strfieldcpy(udev->name, &temp[1]);
188 dbg("'%s' not found in database, falling back on default name", udev->name);
191 dbg("remove name='%s'", udev->name);
192 udevdb_delete_dev(udev->devpath);
194 /* use full path to the environment */
195 snprintf(udev->devname, NAME_SIZE-1, "%s%s", udev_root, udev->name);
197 return delete_node(udev);