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Re: [Full-disclosure] FreeBSD <= 6.1 kqueue() NULL pointer dereference
- To: full-disclosure@xxxxxxxxxxxxxxxxx
- Subject: Re: [Full-disclosure] FreeBSD <= 6.1 kqueue() NULL pointer dereference
- From: Przemyslaw Frasunek <venglin@xxxxxxxxxxxxxxxxx>
- Date: Mon, 24 Aug 2009 13:49:47 +0200
> FreeBSD <= 6.1 suffers from classical check/use race condition on SMP
> systems in kevent() syscall
[...]
In fact, the same bug affects most recent version of DragonFlyBSD and
NetBSD, but it seems to be not-exploitable due to mutexes. In case of
NetBSD, exploitation attempt causes kernel-mode deadlock, therefore
process is unkillable (even with SIGKILL) until reboot, which can lead
to DoS.
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