linux-kernel - Re: mprotect abuse in slim

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Message-ID: <84144f020701112343n1e398fc4r65fa83717f9e5f02@mail.gmail.com>
Date:	Fri, 12 Jan 2007 09:43:10 +0200
From:	"Pekka Enberg" <penberg@...helsinki.fi>
To:	"Serge E. Hallyn" <serue@...ibm.com>
Cc:	"Christoph Hellwig" <hch@...radead.org>,
	"Arjan van de Ven" <arjan@...radead.org>,
	"Mimi Zohar" <zohar@...ibm.com>, akpm@...l.org,
	kjhall@...ux.vnet.ibm.com, linux-kernel@...r.kernel.org,
	safford@...f.watson.ibm.com
Subject: Re: mprotect abuse in slim

On 1/11/07, Serge E. Hallyn <serue@...ibm.com> wrote:
> Right, but is returning -EINVAL to userspace on munmap a problem?

Yes, because an application has no way of reusing the revoked mapping
range. The current patch should get this right, though.

On 1/11/07, Serge E. Hallyn <serue@...ibm.com> wrote:
> Thanks for the tw other patches - I'll give them a shot and check
> out current munmap behavior just as soon as I get a chance.

I hacked the remaining open issues yesterday so please use this instead:

http://www.cs.helsinki.fi/u/penberg/linux/revoke/revoke-2.6.20-rc4

The one at kernel.org will be updated as well when mirroring catches up.
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