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Commit 7a99565f authored by Martin Hostettler's avatar Martin Hostettler Committed by Greg Kroah-Hartman
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vt: ignore csi sequences with intermediate characters. 



Various csi sequences contain intermediate characters between the
parameters and the final character. Introduce a additional state that
cleanly ignores these sequences.

This allows the vt to ignore these sequences used by more capable
terminal implementations such as "request mode", etc.

Signed-off-by: default avatarMartin Hostettler <textshell@uchuujin.de>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 5445447b

drivers/tty/vt/vt.c

+10 −1
Original line number Diff line number Diff line
@@ -2023,7 +2023,7 @@ static void restore_cur(struct vc_data *vc) 
}



enum { ESnormal, ESesc, ESsquare, ESgetpars, ESfunckey,

	EShash, ESsetG0, ESsetG1, ESpercent, ESignore, ESnonstd,

	EShash, ESsetG0, ESsetG1, ESpercent, EScsiignore, ESnonstd,

	ESpalette, ESosc };



/* console_lock is held (except via vc_init()) */
@@ -2261,6 +2261,10 @@ static void do_con_trol(struct tty_struct *tty, struct vc_data *vc, int c) 
			vc->vc_par[vc->vc_npar] += c - '0';

			return;

		}

		if (c >= 0x20 && c <= 0x2f) {

			vc->vc_state = EScsiignore;

			return;

		}

		vc->vc_state = ESnormal;

		switch(c) {

		case 'h':
@@ -2423,6 +2427,11 @@ static void do_con_trol(struct tty_struct *tty, struct vc_data *vc, int c) 
			return;

		}

		return;

	case EScsiignore:

		if (c >= 20 && c <= 0x3f)

			return;

		vc->vc_state = ESnormal;

		return;

	case ESpercent:

		vc->vc_state = ESnormal;

		switch (c) {