linux-kernel - Re: New Security Features, Please Comment

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Message-ID: <4935EADC.3070407@davidnewall.com>
Date:	Wed, 03 Dec 2008 12:41:40 +1030
From:	David Newall <davidn@...idnewall.com>
To:	Geoffrey McRae <geoff@...idhost.com>
CC:	Alan Cox <alan@...rguk.ukuu.org.uk>, linux-kernel@...r.kernel.org
Subject: Re: New Security Features, Please Comment

Geoffrey McRae wrote:
> But once this set is introduced a HTTP server could be written that uses
> forked children to handle requests, that have their identity swtiched
> before doing any work, including parsing CGI scripts.

But a child could be one user the first time it does work, and another
user the next time.  What prevents the child from opening a file while
the first user, and reading or writing it while the second?  That's
exactly what you don't want to permit.
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