vt: detect and ignore OSC codes.

These can be used to send commands consisting of an arbitrary string to the
terminal, most often used to set a terminal's window title or to redefine
the colour palette.  Our console doesn't use OSC, unlike everything else,
which can lead to junk being displayed if a process sends such a code
unconditionally.

The rules for termination follow established practice rather than Ecma-48.
Ecma-48 requires the string to use only byte values 0x08..0x0D and
0x20..0x7E, terminated with either ESC \ or 0x9C.  This would disallow using
8-bit characters, which are reasonable for example in window titles.
A widespread idiom is to terminate with 0x07.  The behaviour for other
control characters differs between terminal emulators, I followed libvte and
xterm:
* 0x07 and ESC anything terminate
* nothing else terminates, all 8-bit values including 0x9C are considered a
  part of the string

Signed-off-by: Adam Borowski <kilobyte@angband.pl>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 11 insertions, 3 deletions

diff --git a/drivers/tty/vt/vt.c b/drivers/tty/vt/vt.c
index b7bde54db138..3ad0b61e35b4 100644
--- a/drivers/tty/vt/vt.c
+++ b/drivers/tty/vt/vt.c
@@ -1592,7 +1592,7 @@ static void restore_cur(struct vc_data *vc)
 
 enum { ESnormal, ESesc, ESsquare, ESgetpars, ESfunckey,
         EShash, ESsetG0, ESsetG1, ESpercent, ESignore, ESnonstd,
-        ESpalette };
+        ESpalette, ESosc };
 
 /* console_lock is held (except via vc_init()) */
 static void reset_terminal(struct vc_data *vc, int do_clear)
@@ -1652,11 +1652,15 @@ static void do_con_trol(struct tty_struct *tty, struct vc_data *vc, int c)
          *  Control characters can be used in the _middle_
          *  of an escape sequence.
          */
+        if (vc->vc_state == ESosc && c>=8 && c<=13) /* ... except for OSC */
+                return;
         switch (c) {
         case 0:
                 return;
         case 7:
-                if (vc->vc_bell_duration)
+                if (vc->vc_state == ESosc)
+                        vc->vc_state = ESnormal;
+                else if (vc->vc_bell_duration)
                         kd_mksound(vc->vc_bell_pitch, vc->vc_bell_duration);
                 return;
         case 8:
@@ -1767,7 +1771,9 @@ static void do_con_trol(struct tty_struct *tty, struct vc_data *vc, int c)
                 } else if (c=='R') {   /* reset palette */
                         reset_palette(vc);
                         vc->vc_state = ESnormal;
-                } else
+                } else if (c>='0' && c<='9')
+                        vc->vc_state = ESosc;
+                else
                         vc->vc_state = ESnormal;
                 return;
         case ESpalette:
@@ -2021,6 +2027,8 @@ static void do_con_trol(struct tty_struct *tty, struct vc_data *vc, int c)
                         vc->vc_translate = set_translate(vc->vc_G1_charset, vc);
                 vc->vc_state = ESnormal;
                 return;
+        case ESosc:
+                return;
         default:
                 vc->vc_state = ESnormal;
         }