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.
33 #include "udev_version.h"
38 static int delete_path(char *path)
43 pos = strrchr(path, '/');
46 pos = strrchr(path, '/');
48 /* don't remove the last one */
49 if ((pos == path) || (pos == NULL))
57 if (errno == ENOTEMPTY)
59 dbg("rmdir(%s) failed with error '%s'",
60 path, strerror(errno));
63 dbg("removed '%s'", path);
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
74 static int secure_unlink(const char *filename)
78 retval = chown(filename, 0, 0);
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.
87 retval = chmod(filename, 0000);
89 dbg("chmod(%s, 0000) failed with error '%s'",
90 filename, strerror(errno));
91 /* We continue nevertheless. */
93 retval = unlink(filename);
97 dbg("unlink(%s) failed with error '%s'",
98 filename, strerror(errno));
103 static int delete_node(struct udevice *dev)
105 char filename[NAME_SIZE];
106 char linkname[NAME_SIZE];
107 char partitionname[NAME_SIZE];
113 strfieldcpy(filename, udev_root);
114 strfieldcat(filename, dev->name);
116 info("removing device node '%s'", filename);
117 retval = secure_unlink(filename);
121 /* remove partition nodes */
122 if (dev->partitions > 0) {
123 info("removing partitions '%s[1-%i]'", filename, dev->partitions);
124 for (i = 1; i <= dev->partitions; i++) {
125 strfieldcpy(partitionname, filename);
126 strintcat(partitionname, i);
127 secure_unlink(partitionname);
131 /* remove subdirectories */
132 if (strchr(dev->name, '/'))
133 delete_path(filename);
135 foreach_strpart(dev->symlink, " ", pos, len) {
136 strfieldcpymax(linkname, pos, len+1);
137 strfieldcpy(filename, udev_root);
138 strfieldcat(filename, linkname);
140 dbg("unlinking symlink '%s'", filename);
141 retval = unlink(filename);
145 dbg("unlink(%s) failed with error '%s'",
146 filename, strerror(errno));
149 if (strchr(dev->symlink, '/')) {
150 delete_path(filename);
158 * Look up the sysfs path in the database to see if we have named this device
159 * something different from the kernel name. If we have, us it. If not, use
160 * the default kernel name for lack of anything else to know to do.
162 int udev_remove_device(const char *path, const char *subsystem)
168 memset(&dev, 0x00, sizeof(dev));
170 retval = udevdb_get_dev(path, &dev);
172 dbg("'%s' not found in database, falling back on default name", path);
173 temp = strrchr(path, '/');
176 strfieldcpy(dev.name, &temp[1]);
178 dbg("name='%s'", dev.name);
180 dev.type = get_device_type(path, subsystem);
181 dev_d_send(&dev, subsystem, path);
182 udevdb_delete_dev(path);
184 if (dev.type == 'b' || dev.type == 'c')
185 retval = delete_node(&dev);
186 else if (dev.type == 'n')