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

[Andi Kleen]

> +	} 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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