-/** Remove all permissions on the device node, before
- * unlinking it. This fixes a security issue.
- * If the user created a hard-link to the device node,
- * he can't use it any longer, because he lost permission
- * to do so.
- */
-static int secure_unlink(const char *filename)
-{
- int retval;
-
- retval = chown(filename, 0, 0);
- if (retval) {
- dbg("chown(%s, 0, 0) failed with error '%s'",
- filename, strerror(errno));
- /* We continue nevertheless.
- * I think it's very unlikely for chown
- * to fail here, if the file exists.
- */
- }
- retval = chmod(filename, 0000);
- if (retval) {
- dbg("chmod(%s, 0000) failed with error '%s'",
- filename, strerror(errno));
- /* We continue nevertheless. */
- }
- retval = unlink(filename);
- if (errno == ENOENT)
- retval = 0;
- if (retval) {
- dbg("unlink(%s) failed with error '%s'",
- filename, strerror(errno));
- }
- return retval;
-}
-