From db0054fe613b21cd65c1609680cc47c520760044 Mon Sep 17 00:00:00 2001
From: Jann Horn <jann@thejh.net>
Date: Sun, 4 Oct 2015 19:29:12 +0200
Subject: [PATCH] drivers/tty: require read access for controlling terminal

commit 0c55627167870255158db1cde0d28366f91c8872 upstream.

This is mostly a hardening fix, given that write-only access to other
users' ttys is usually only given through setgid tty executables.

Signed-off-by: Jann Horn <jann@thejh.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
[bwh: Backported to 3.2:
 - __proc_set_tty() also takes a task_struct pointer]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
---
Reading git-format-patch failed