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tty: Fix termios tty window resize race with pty/tty pair 

Kanru Chen posted a patch versus the old code which deals with the case
where you resize the pty side of a pty/tty pair. In that situation the
termios data is updated for both pty and tty but the locks are not held
for the right side.

This implements the fix differently against the updated tty code. Patch
by self but the hard bit (noticing and fixing the bug) is thanks to Kanru
Chen.

Signed-off-by: Alan Cox <alan@redhat.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Alan Cox 2008-08-26 19:55:58 +01:00 committed by Linus Torvalds
parent f753f3272b
commit a152db71d9
1 changed files with 4 additions and 3 deletions
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7
drivers/char/tty_io.c
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@ -2498,7 +2498,7 @@ static int tiocgwinsz(struct tty_struct *tty, struct winsize __user *arg)
/**
* tty_do_resize - resize event
* @tty: tty being resized
* @real_tty: real tty (if using a pty/tty pair)
* @real_tty: real tty (not the same as tty if using a pty/tty pair)
* @rows: rows (character)
* @cols: cols (character)
*
@ -2512,7 +2512,8 @@ int tty_do_resize(struct tty_struct *tty, struct tty_struct *real_tty,
struct pid *pgrp, *rpgrp;
unsigned long flags;
mutex_lock(&tty->termios_mutex);
/* For a PTY we need to lock the tty side */
mutex_lock(&real_tty->termios_mutex);
if (!memcmp(ws, &tty->winsize, sizeof(*ws)))
goto done;
/* Get the PID values and reference them so we can
@ -2533,7 +2534,7 @@ int tty_do_resize(struct tty_struct *tty, struct tty_struct *real_tty,
tty->winsize = *ws;
real_tty->winsize = *ws;
done:
mutex_unlock(&tty->termios_mutex);
mutex_unlock(&real_tty->termios_mutex);
return 0;
}