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Patch "tty: vt: fix up tabstops properly" has been added to the 4.4-stable tree

PATCH [email protected] 1 participant 1 message Mar 25, 2018

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This is a note to let you know that I've just added the patch titled

tty: vt: fix up tabstops properly

to the 4.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
tty-vt-fix-up-tabstops-properly.patch
and it can be found in the queue-4.4 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let <[email protected]> know about it.

Quoted 1 line

From f1869a890cdedb92a3fab969db5d0fd982850273 Mon Sep 17 00:00:00 2001

From: Linus Torvalds <[email protected]>
Date: Sat, 24 Mar 2018 10:43:26 +0100
Subject: tty: vt: fix up tabstops properly

From: Linus Torvalds <[email protected]>

commit f1869a890cdedb92a3fab969db5d0fd982850273 upstream.

Tabs on a console with long lines do not wrap properly, so correctly account for the line length when computing the tab placement location.

Reported-by James Holderness <[email protected]>
Signed-off-by Greg Kroah-Hartman <[email protected]>
Cc stable <[email protected]>
Signed-off-by Linus Torvalds <[email protected]>
Signed-off-by Greg Kroah-Hartman <[email protected]>
---
 drivers/tty/vt/vt.c |    8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)
drivers/tty/vt/vt.c +4 -4
@@ -1725,7 +1725,7 @@ static void reset_terminal(struct vc_dat
 	default_attr(vc);
 	update_attr(vc);
 
-	vc->vc_tab_stop[0]	= 0x01010100;
+	vc->vc_tab_stop[0]	=
 	vc->vc_tab_stop[1]	=
 	vc->vc_tab_stop[2]	=
 	vc->vc_tab_stop[3]	=

@@ -1769,7 +1769,7 @@ static void do_con_trol(struct tty_struc
 		vc->vc_pos -= (vc->vc_x << 1);
 		while (vc->vc_x < vc->vc_cols - 1) {
 			vc->vc_x++;
-			if (vc->vc_tab_stop[vc->vc_x >> 5] & (1 << (vc->vc_x & 31)))
+			if (vc->vc_tab_stop[7 & (vc->vc_x >> 5)] & (1 << (vc->vc_x & 31)))
 				break;
 		}
 		vc->vc_pos += (vc->vc_x << 1);

@@ -1829,7 +1829,7 @@ static void do_con_trol(struct tty_struc
 			lf(vc);
 			return;
 		case 'H':
-			vc->vc_tab_stop[vc->vc_x >> 5] |= (1 << (vc->vc_x & 31));
+			vc->vc_tab_stop[7 & (vc->vc_x >> 5)] |= (1 << (vc->vc_x & 31));
 			return;
 		case 'Z':
 			respond_ID(tty);

@@ -2022,7 +2022,7 @@ static void do_con_trol(struct tty_struc
 			return;
 		case 'g':
 			if (!vc->vc_par[0])
-				vc->vc_tab_stop[vc->vc_x >> 5] &= ~(1 << (vc->vc_x & 31));
+				vc->vc_tab_stop[7 & (vc->vc_x >> 5)] &= ~(1 << (vc->vc_x & 31));
 			else if (vc->vc_par[0] == 3) {
 				vc->vc_tab_stop[0] =
 					vc->vc_tab_stop[1] =

Patches currently in stable-queue which might be from [email protected] are

queue-4.4/tty-vt-fix-up-tabstops-properly.patch queue-4.4/mm-vmalloc-add-interfaces-to-free-unmapped-page-table.patch queue-4.4/kvm-x86-fix-icebp-instruction-handling.patch queue-4.4/x86-mm-implement-free-pmd-pte-page-interfaces.patch