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| author | Thomas Gleixner <tglx@linutronix.de> | 2014-06-03 12:27:06 +0000 |
|---|---|---|
| committer | James Wylder <jwylder@motorola.com> | 2014-07-15 16:41:07 +0000 |
| commit | b5cb56ef23040ddd5f9725f54bcab9e174a8bb1e (patch) | |
| tree | eac5bdad425cdcccac09375f1f4a51ee2c994db6 /kernel/smp.c | |
| parent | 2b764141c7b8194e2be5deeddd86e5fee6d98de4 (diff) | |
| download | olio-linux-3.10-b5cb56ef23040ddd5f9725f54bcab9e174a8bb1e.tar.xz olio-linux-3.10-b5cb56ef23040ddd5f9725f54bcab9e174a8bb1e.zip | |
futex-prevent-requeue-pi-on-same-futex.patch futex: Forbid uaddr == uaddr2 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.
Reported-by: Pinkie Pie
Signed-off-by: Will Drewry <wad@chromium.org>
Signed-off-by: Kees Cook <keescook@chromium.org>
Cc: stable@vger.kernel.org
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Darren Hart <dvhart@linux.intel.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'kernel/smp.c')
0 files changed, 0 insertions, 0 deletions