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Message-ID: <20070610162134.078db9f0@the-village.bc.nu>
Date: Sun, 10 Jun 2007 16:21:34 +0100
From: Alan Cox <alan@...rguk.ukuu.org.uk>
To: Kari Hurtta <hurtta+gmane@...lo.fmi.fi>
Cc: linux-kernel@...r.kernel.org
Subject: Re: [patch 7/8] fdmap v2 - implement sys_socket2
> Real world example is nss_ldap / pam_ldap -- these needs open socket to
> ldap server. That socket is cached. And because they can not trust that
> application does not have closed file description of them, they check it with
> getpeername + getsockname (at least it did when I looked code on
> some years ago.)
>
> ( opening socket again includes using starttls and authentication .. so it is
> quite some overhead )
And if the fd was closed because of a security transition in the
application hiding it and caching it from the application might then lead
to a security hole.
Alan
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