linux-kernel - Re: [PATCH 3/3] CRED: Move the effective capabilities into the cred struct

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Message-ID: <46F1F2EE.1010904@kernel.org>
Date:	Wed, 19 Sep 2007 21:11:26 -0700
From:	Andrew Morgan <morgan@...nel.org>
To:	David Howells <dhowells@...hat.com>
CC:	viro@....linux.org.uk, hch@...radead.org,
	Trond.Myklebust@...app.com, sds@...ho.nsa.gov,
	casey@...aufler-ca.com, linux-kernel@...r.kernel.org,
	selinux@...ho.nsa.gov, linux-security-module@...r.kernel.org
Subject: Re: [PATCH 3/3] CRED: Move the effective capabilities into the cred
 struct

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David Howells wrote:
> Move the effective capabilities mask from the task struct into the credentials
> record.
> 
> Note that the effective capabilities mask in the cred struct shadows that in
> the task_struct because a thread can have its capabilities masks changed by
> another thread.  The shadowing is performed by update_current_cred() which is
> invoked on entry to any system call that might need it.

OOC If we were to simply drop support for one process changing the
capabilities of another, would we need this patch?

Thanks

Andrew
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