linux-kernel - Re: [patch] file capabilities: Add no_file

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Date:	Wed, 27 Aug 2008 18:00:07 +0100
From:	David Howells <dhowells@...hat.com>
To:	Alan Cox <alan@...rguk.ukuu.org.uk>
Cc:	dhowells@...hat.com, "Serge E. Hallyn" <serue@...ibm.com>,
	Andreas Gruenbacher <agruen@...e.de>,
	"Andrew G. Morgan" <morgan@...nel.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [patch] file capabilities: Add no_file_caps switch

Alan Cox <alan@...rguk.ukuu.org.uk> wrote:

> That gets foul in another way - bounding the worst case RCU
> memory utilisation if someone is sitting doing things like while(1)
> change_credentials();

Is it worth calling synchronize_rcu() in commit_creds() to make sure that the
old memory will have been freed if possible?  Admittedly that'll slow setuid()
and co. down, but it should avoid that problem.

David
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