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Message-ID: <27726.1219856407@redhat.com>
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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