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Re: Getting Started with Hurd-L4


From: Neal H. Walfield
Subject: Re: Getting Started with Hurd-L4
Date: Mon, 25 Oct 2004 23:06:48 +0100
User-agent: Wanderlust/2.10.1 (Watching The Wheels) SEMI/1.14.6 (Maruoka) FLIM/1.14.6 (Marutamachi) APEL/10.6 Emacs/21.2 (i386-debian-linux-gnu) MULE/5.0 (SAKAKI)

> However, this can only be done with server-side
> support (the server must be informed about the cancelation - if we
> simply abort the IPC without letting the server know, we are violating
> the protocol and leave our client-server connection in an undefined
> state.  The server would have no way to find out that we canceled it
> without trying to send a reply, at which time the reply would get
> lost, which is sometimes fatal for non-recoverable, non-repeatable
> operations).

This should only hurt the client, not the server.  That is: if
canceling an IPC would hurt the server there is an opportunity for an
attack by malicious clients.  Right?





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