Messages in this thread Patch in this message | | | Date | Sat, 18 Oct 2008 13:49:31 +0200 | From | Wolfgang Kroworsch <> | Subject | [PATCH] vt: incomplete initialization of vc_tab_stop |
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Problem 1 (see patch below): vc_tab_stop is declared as an array of 8 unsigned ints in struct vc_data in include/linux/console_struct.h . In drivers/char/vt.c only 5 of these 8 unsigned ints get initialized leading to unintended tabulator placement on displays with more than 160 columns text.
Problem 2 (open): Upcoming displays will have more than 256 columns of text leading to invalid memory access in drivers/char/vt.c during tabulator calculations: if (vc->vc_tab_stop[vc->vc_x >> 5] & (1 << (vc->vc_x & 31))) break;
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drivers/char/vt.c | 10 ++++++++-- 1 files changed, 8 insertions(+), 2 deletions(-)
diff --git a/drivers/char/vt.c b/drivers/char/vt.c index d8f83e2..a5af607 100644 --- a/drivers/char/vt.c +++ b/drivers/char/vt.c @@ -1644,7 +1644,10 @@ static void reset_terminal(struct vc_data *vc, int do_clear) vc->vc_tab_stop[1] = vc->vc_tab_stop[2] = vc->vc_tab_stop[3] = - vc->vc_tab_stop[4] = 0x01010101; + vc->vc_tab_stop[4] = + vc->vc_tab_stop[5] = + vc->vc_tab_stop[6] = + vc->vc_tab_stop[7] = 0x01010101; vc->vc_bell_pitch = DEFAULT_BELL_PITCH; vc->vc_bell_duration = DEFAULT_BELL_DURATION; @@ -1935,7 +1938,10 @@ static void do_con_trol(struct tty_struct *tty, struct vc_data *vc, int c) vc->vc_tab_stop[1] = vc->vc_tab_stop[2] = vc->vc_tab_stop[3] = - vc->vc_tab_stop[4] = 0; + vc->vc_tab_stop[4] = + vc->vc_tab_stop[5] = + vc->vc_tab_stop[6] = + vc->vc_tab_stop[7] = 0; } return; case 'm':
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