full-disclosure - Re: FreeBSD <= 6.1 kqueue() NULL pointer dereference

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Message-ID: <4A927E5B.6070809@freebsd.lublin.pl>
Date: Mon, 24 Aug 2009 13:49:47 +0200
From: Przemyslaw Frasunek <venglin@...ebsd.lublin.pl>
To: full-disclosure@...ts.grok.org.uk
Subject: Re: FreeBSD <= 6.1 kqueue() NULL pointer
	dereference

> 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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