[CVE-2010-4076/CVE-2010-4077] tty: icount changeover for other main devices

[Andy Whitcroft]

CVE-2010-4076
	The rs_ioctl function in drivers/char/amiserial.c in the Linux
	kernel 2.6.36.1 and earlier does not properly initialize a certain
	structure member, which allows local users to obtain potentially
	sensitive information from kernel stack memory via a TIOCGICOUNT
	ioctl call.

CVE-2010-4077
	The ntty_ioctl_tiocgicount function in drivers/char/nozomi.c in
	the Linux kernel 2.6.36.1 and earlier does not properly initialize
	a certain structure member, which allows local users to obtain
	potentially sensitive information from kernel stack memory via
	a TIOCGICOUNT ioctl call.

The above two CVEs were though fixed by upstream commit below (also the fix
for CVE-2010-4075):

  commit d281da7ff6f70efca0553c288bb883e8605b3862
  Author: Alan Cox <alan at linux.intel.com>
  Date:   Thu Sep 16 18:21:24 2010 +0100

    tty: Make tiocgicount a handler

However until the drivers themselves are converted by a follow up commit
they do not make use of the new functionality.  This is done for all the
main drivers in the following commit:

  commit 0587102cf9f427c185bfdeb2cef41e13ee0264b1
  Author: Alan Cox <alan at linux.intel.com>
  Date:   Thu Sep 16 18:21:52 2010 +0100

    tty: icount changeover for other main devices

This commit is already applied for Natty and later arriving via
mainline.  Following this email are patches for Hardy, Lucid,
Lucid/fsl-imx51, and Maverick.

NOTE: these are all backports with conflicts, are huge, and therefore
deserve some real review before application.

-apw