linux-kernel - Re: [PATCH 2/3] perf, x86, lbr: Fix LBR filter

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Message-ID: <20130503143411.GO19487@tassilo.jf.intel.com>
Date:	Fri, 3 May 2013 07:34:11 -0700
From:	Andi Kleen <ak@...ux.intel.com>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc:	mingo@...nel.org, linux-kernel@...r.kernel.org, eranian@...gle.com
Subject: Re: [PATCH 2/3] perf, x86, lbr: Fix LBR filter

> +	} else {
> +		/*
> +		 * The LBR logs any address in the IP, even if the IP just
> +		 * faulted. This means userspace can control the from address.
> +		 * Ensure we don't blindy read any address by validating it is
> +		 * a known text address.
> +		 */
> +		if (kernel_text_address(from))

Sorry doing it this way is just incredible expensive and dumb.

After all the tool is called "perf" and not "non perf"

-Andi
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