tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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>
authored by
Arthur Taylor
and committed by
Greg Kroah-Hartman
9fc3de9c
8e6d3fe1
+9
-3
+3
-2
drivers/tty/vt/keyboard.c
+3
-2
drivers/tty/vt/keyboard.c
···
654
654
if (value >= ARRAY_SIZE(fn_handler))
655
655
return;
656
656
if ((kbd->kbdmode == VC_RAW ||
657
-
kbd->kbdmode == VC_MEDIUMRAW) &&
657
+
kbd->kbdmode == VC_MEDIUMRAW ||
658
+
kbd->kbdmode == VC_OFF) &&
658
659
value != KVAL(K_SAK))
659
660
return; /* SAK is allowed even in raw mode */
660
661
fn_handler[value](vc);
···
1296
1295
if (rc == NOTIFY_STOP)
1297
1296
return;
1298
1297
1299
-
if (raw_mode && type != KT_SPEC && type != KT_SHIFT)
1298
+
if ((raw_mode || kbd->kbdmode == VC_OFF) && type != KT_SPEC && type != KT_SHIFT)
1300
1299
return;
1301
1300
1302
1301
(*k_handler[type])(vc, keysym & 0xff, !down);
+3
drivers/tty/vt/vt_ioctl.c
+3
drivers/tty/vt/vt_ioctl.c
+2
-1
include/linux/kbd_kern.h
+2
-1
include/linux/kbd_kern.h
···
50
50
#define VC_CAPSLOCK 2 /* capslock mode */
51
51
#define VC_KANALOCK 3 /* kanalock mode */
52
52
53
-
unsigned char kbdmode:2; /* one 2-bit value */
53
+
unsigned char kbdmode:3; /* one 3-bit value */
54
54
#define VC_XLATE 0 /* translate keycodes using keymap */
55
55
#define VC_MEDIUMRAW 1 /* medium raw (keycode) mode */
56
56
#define VC_RAW 2 /* raw (scancode) mode */
57
57
#define VC_UNICODE 3 /* Unicode mode */
58
+
#define VC_OFF 4 /* disabled mode */
58
59
59
60
unsigned char modeflags:5;
60
61
#define VC_APPLIC 0 /* application key mode */