linux-kernel - Re: [PATCH] audit: speedup for syscalls when auditing is disabled

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Date:	Tue, 24 Aug 2010 12:16:26 +1000
From:	Anton Blanchard <anton@...ba.org>
To:	Eric Paris <eparis@...hat.com>
Cc:	Michael Neuling <mikey@...ling.org>, linux-audit@...hat.com,
	linux-kernel@...r.kernel.org, Al Viro <viro@...iv.linux.org.uk>
Subject: Re: [PATCH] audit: speedup for syscalls when auditing is disabled

 
Hi Eric,

> I don't think this works at all.  I don't see how syscall audit'ing can
> work.  What if I have nothing in the AUDIT_FILTER_TASK list but I want
> to audit all 'open(2)' syscalls?  This patch is going to leave the task
> in the DISABLED state and we won't ever be able to match on the syscall
> rules.

That's a good point. What if we went through and created an audit context
for each thread at the point where we add a rule to the audit subsystem?

That would make the common case where no one touches audit go fast. It's
only once you add a rule that you get the syscall entry/exit overhead of
audit.

Anton
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