vt: Add virtual console keyboard mode OFF

virtual console: add keyboard mode OFF

Add a new mode for the virtual console keyboard OFF in which all input
other than shift keys is ignored. Prevents vt input buffers from
overflowing when a program opens but doesn't read from a tty, like X11
using evdev for input.

Signed-off-by: Arthur Taylor <art@ified.ca>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 2 insertions, 1 deletions

diff --git a/include/linux/kbd_kern.h b/include/linux/kbd_kern.h
index 506ad20c18f8..4b0761cc7dd9 100644
--- a/include/linux/kbd_kern.h
+++ b/include/linux/kbd_kern.h
@@ -50,11 +50,12 @@ struct kbd_struct {
 #define VC_CAPSLOCK     2       /* capslock mode */
 #define VC_KANALOCK     3       /* kanalock mode */
 
-        unsigned char kbdmode:2;        /* one 2-bit value */
+        unsigned char kbdmode:3;        /* one 3-bit value */
 #define VC_XLATE        0       /* translate keycodes using keymap */
 #define VC_MEDIUMRAW    1       /* medium raw (keycode) mode */
 #define VC_RAW          2       /* raw (scancode) mode */
 #define VC_UNICODE      3       /* Unicode mode */
+#define VC_OFF          4       /* disabled mode */
 
         unsigned char modeflags:5;
 #define VC_APPLIC       0       /* application key mode */