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

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Date:	Tue, 24 Aug 2010 11:14:56 -0400 (EDT)
From:	Miloslav Trmac <mitr@...hat.com>
To:	Eric Paris <eparis@...hat.com>
Cc:	linux-audit@...hat.com, linux-kernel@...r.kernel.org,
	anton@...ba.org, Al Viro <viro@...iv.linux.org.uk>,
	Michael Neuling <mikey@...ling.org>
Subject: Re: [PATCH] audit: speedup for syscalls when auditing is disabled

----- "Eric Paris" <eparis@...hat.com> wrote:
> Add a new spot in the assembly which will call a function which will
> check if audit_n_rules > 0 and if so will set TIF_SYSCALL_AUDIT and if
> not will clear TIF_SYSCALL_AUDIT?  It might make things slightly worse
> on systems which explictly disable audit and the flag would always be
> clear on every task (like you did with the explicit rule) but I'm
> guessing might be a win on systems with no rules which are wasting time
> on the audit slow path.....
Is "audit_n_rules" a specific enough trigger?  Right now, even if there are no rules configured at all, audit_log_start() while processing a syscall will mark that syscall for auditing, and all collected information about the syscall will be logged at syscall exit.

Would the suggested change break this behavior?
    Mirek
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