linux-kernel - Re: [PATCH 06b/26] Security: Make NFSD work with detached security

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Date:	Thu, 17 Jan 2008 23:02:06 +0000
From:	David Howells <dhowells@...hat.com>
To:	unlisted-recipients:; (no To-header on input)
Cc:	dhowells@...hat.com, "J. Bruce Fields" <bfields@...ldses.org>,
	sds@...ho.nsa.gov, casey@...aufler-ca.com,
	Trond.Myklebust@...app.com, neilb@...e.de,
	linux-kernel@...r.kernel.org, selinux@...ho.nsa.gov,
	linux-security-module@...r.kernel.org, nfs@...ts.sourceforge.net
Subject: Re: [PATCH 06b/26] Security: Make NFSD work with detached security

David Howells <dhowells@...hat.com> wrote:

> J. Bruce Fields <bfields@...ldses.org> wrote:
> 
> > Just curious--why?  Are get_kernel_security(), etc., particularly
> > expensive?
> 
> It involves a kmalloc().  That means an extra possibility for an error.  Plus
> it may allow you to cache the result of checking whether, say, SELinux
> security labels are allowed to be set when passed over NFS (if such is
> possible).

Apart from that, though, no, it's not particularly expensive.

David
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