Messages in this thread |  | | Date | Thu, 13 Feb 2014 10:39:12 -0800 | From | Greg Kroah-Hartman <> | Subject | Re: [PATCH] vt: detect and ignore OSC codes. |
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On Wed, Jan 15, 2014 at 07:21:04AM +0100, Adam Borowski wrote: > 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. > > Not following Ecma-48, this commit recognizes 7-bit forms (ESC ] ... 0x07, > ESC ] .. ESC \) but not 8-bit (0x9D ... 0x9C). > > Signed-off-by: Adam Borowski <kilobyte@angband.pl>
Where is this documented?
> --- > drivers/tty/vt/vt.c | 14 +++++++++++--- > 1 file changed, 11 insertions(+), 3 deletions(-) > > diff --git a/drivers/tty/vt/vt.c b/drivers/tty/vt/vt.c > index 61b1137..0377c52 100644 > --- a/drivers/tty/vt/vt.c > +++ b/drivers/tty/vt/vt.c > @@ -1590,7 +1590,7 @@ static void restore_cur(struct vc_data *vc) > > enum { ESnormal, ESesc, ESsquare, ESgetpars, ESgotpars, 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) > @@ -1650,11 +1650,15 @@ 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: > @@ -1765,7 +1769,9 @@ 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: > @@ -2023,6 +2029,8 @@ static void do_con_trol(struct tty_struct *tty, struct vc_data *vc, int c) > return; > default: > vc->vc_state = ESnormal; > + case ESosc: > + return;
Why below the default: case?
thanks,
greg k-h
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