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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 ] Change-Id: Ibe6195215657c86bf2e39305656fdacf7230389d Reported-by: Pinkie Pie Signed-off-by: Will Drewry <email@example.com> Signed-off-by: Kees Cook <firstname.lastname@example.org> Cc: email@example.com Signed-off-by: Thomas Gleixner <firstname.lastname@example.org> Reviewed-by: Darren Hart <email@example.com> Signed-off-by: Linus Torvalds <firstname.lastname@example.org>
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