NovaFusion/android_kernel_samsung_golden — pull request #1 by Kevindeving (2014-06-24 14:32:30+00:00)
Title: futex-prevent-requeue-pi-on-same-futex.patch futex: Forbid uaddr == uadd...

...r2 in futex_requeue(..., requeue_pi=1)

If uaddr == uaddr2, then we have broken the rule of only requeueing from
a non-pi futex to a pi futex with this call. If we attempt this, then
dangling pointers may be left for rt_waiter resulting in an exploitable
condition.

This change brings futex_requeue() in line with futex_wait_requeue_pi()
which performs the same check as per commit 6f7b0a2a5c0f ("futex: Forbid
uaddr == uaddr2 in futex_wait_requeue_pi()")

[ tglx: Compare the resulting keys as well, as uaddrs might be
different depending on the mapping ]

Fixes CVE-2014-3153.

Change-Id: I490f279c488f7a5c308c5b8dba4d5539e2a6c0ba
Reported-by: Pinkie Pie
Signed-off-by: Will Drewry
Signed-off-by: Kees Cook
Cc: stable@vger.kernel.org
Signed-off-by: Thomas Gleixner
Reviewed-by: Darren Hart
Signed-off-by: Linus Torvalds