Date: Wed, 23 Dec 1998 19:54:54 +1100 From: Peter Jeremy <peter.jeremy@auss2.alcatel.com.au> To: freebsd-security@FreeBSD.ORG Cc: dillon@apollo.backplane.com Subject: Re: cvs commit: src/etc rc.conf Message-ID: <98Dec23.195410est.40360@border.alcanet.com.au>
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Matthew Dillon <dillon@apollo.backplane.com> wrote:
>:The BSD book describes a bug in the mark and sweep garbage collection
>:algorithm than can result in file descriptor hijacking or kernel memory
>:nasties. Does anyone know if this was ever fixed? (It is discussed in
>:the 4.4BSD book in a footnote on the page that discusses SCM_RIGHTS) I
>:glanced through the code for a while this summer while I was modifying the
>:SCM_ ancillary data passing code to be hookable by an LKM. My goal was to
>:...
>
> I have no idea.... what does the footnote say exactly?
At the bottom of page 389:
"If a listening socket is accessible, then any queued connections
that it holds are also accessible; the garbage collector in 4.4BSD
fails to take this into account."
This footnote is referenced from a paragraph discussing unp_gc() -
which can be found in kern/uipc_usrreq.c. From a quick look at the
2.2.6 CVS logs (the latest I can quickly study), it doesn't look like
it's ever been eradicated.
Peter
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