Re: [patch 7/8] fdmap v2 - implement sys_socket2

[Alan Cox <alan@lxorguk.ukuu.org.uk>]

> 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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