seeing is believing

IOKit Methods Being Called Without Locks From IOServiceClose

IOKit Methods Being Called Without Locks From IOServiceClose
Posted Jan 27, 2016
Authored by Google Security Research, ianbeer

It turns out that the spoofed no-more-senders notification bug when applied to iokit objects was actually just a more complicated way to hit ::clientClose in parallel. You can in fact do this very simply by calling IOServiceClose on two threads. Like the spoofed notifications this leads to many bugs in many userclients, the exact nature of which depends on the semantics of the clientClose implementation.

tags | exploit, spoof
systems | linux
advisories | CVE-2016-1720
MD5 | e994715ca79002c392401ecf2840bc78

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