[PATCH] register_chrdev_region() don't hand out the LOCAL/EXPERIMENTAL majors
As pointed out in http://bugzilla.kernel.org/show_bug.cgi?id=7922, dynamic
chardev major allocation can hand out majors which LANANA has defined as being
for local/experimental use.
Cc: Torben Mathiasen <device@lanana.org>
Cc: Greg KH <greg@kroah.com>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Tomas Klas <tomas.klas@mepatek.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/fs/char_dev.c b/fs/char_dev.c
index a885f46..e6194e2 100644
--- a/fs/char_dev.c
+++ b/fs/char_dev.c
@@ -108,6 +108,13 @@
/* temporary */
if (major == 0) {
for (i = ARRAY_SIZE(chrdevs)-1; i > 0; i--) {
+ /*
+ * Disallow the LANANA-assigned LOCAL/EXPERIMENTAL
+ * majors
+ */
+ if ((60 <= i && i <= 63) || (120 <= i && i <= 127) ||
+ (240 <= i && i <= 254))
+ continue;
if (chrdevs[i] == NULL)
break;
}