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tty: termios locking functions break with new termios type 

I ran into a few problems.

n_tty_ioctl() for instance:

drivers/char/tty_ioctl.c:799: error: $,1rxstruct termios$,1ry has no
member named $,1rxc_ispeed$,1ry

This is calling the copy interface that is supposed to be using
a termios2 when the new interfaces are defined, however:

	case TIOCGLCKTRMIOS:
		if (kernel_termios_to_user_termios((struct termios __user *)arg, real_tty->termios_locked))
			return -EFAULT;
		return 0;

This is going to write over the end of the userspace
structure by a few bytes, and wasn't caught by you yet
because the i386 implementation is simply copy_to_user()
which does zero type checking.

Signed-off-by: Alan Cox <alan@redhat.com>
Cc: "David S. Miller" <davem@davemloft.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
David Miller 2007-09-11 15:23:50 -07:00 committed by Linus Torvalds
parent 179c85ea53
commit f629307c85
1 changed files with 2 additions and 2 deletions
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4
drivers/char/tty_ioctl.c
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@ -796,14 +796,14 @@ int n_tty_ioctl(struct tty_struct * tty, struct file * file,
retval = inq_canon(tty);
return put_user(retval, (unsigned int __user *) arg);
case TIOCGLCKTRMIOS:
if (kernel_termios_to_user_termios((struct termios __user *)arg, real_tty->termios_locked))
if (kernel_termios_to_user_termios_1((struct termios __user *)arg, real_tty->termios_locked))
return -EFAULT;
return 0;
case TIOCSLCKTRMIOS:
if (!capable(CAP_SYS_ADMIN))
return -EPERM;
if (user_termios_to_kernel_termios(real_tty->termios_locked, (struct termios __user *) arg))
if (user_termios_to_kernel_termios_1(real_tty->termios_locked, (struct termios __user *) arg))
return -EFAULT;
return 0;