linux-kernel - Re: [RFC/PATCH] revoke/frevoke system calls V2

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Date:	Wed, 09 Aug 2006 19:36:45 +0100
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Edgar Toernig <froese@....de>
Cc:	Chase Venters <chase.venters@...entec.com>,
	Pekka Enberg <penberg@...helsinki.fi>,
	Pavel Machek <pavel@....cz>, linux-kernel@...r.kernel.org,
	linux-fsdevel@...r.kernel.org, akpm@...l.org,
	viro@...iv.linux.org.uk, tytso@....edu, tigran@...itas.com
Subject: Re: [RFC/PATCH] revoke/frevoke system calls V2

Ar Mer, 2006-08-09 am 20:00 +0200, ysgrifennodd Edgar Toernig:
> But anyway, correct me if I'm wrong, revoke (V2) not simply removes the
> pages from the mmaped area as truncating does (the vma stays);  revoke
> seems to completely remove the vma which is clearly a security bug.
> Future mappings may silently get mapped into the area of the revoked
> file without the app noticing it.  It may then hand out data of the new
> file still thinking it's sending the old one.

I agree with that point 100%.


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