linux-kernel - Re: [PATCH 1/8] perf tools: Preparation for compressed kernel module support

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Date:	Mon, 3 Nov 2014 14:51:17 +0100
From:	Jiri Olsa <jolsa@...hat.com>
To:	Namhyung Kim <namhyung@...nel.org>
Cc:	Arnaldo Carvalho de Melo <acme@...nel.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Ingo Molnar <mingo@...nel.org>,
	Paul Mackerras <paulus@...ba.org>,
	Namhyung Kim <namhyung.kim@....com>,
	LKML <linux-kernel@...r.kernel.org>,
	Adrian Hunter <adrian.hunter@...el.com>,
	David Ahern <dsahern@...il.com>,
	Stephane Eranian <eranian@...gle.com>
Subject: Re: [PATCH 1/8] perf tools: Preparation for compressed kernel module
 support

On Mon, Nov 03, 2014 at 04:27:51PM +0900, Namhyung Kim wrote:

SNIP

> +static int decompress_dummy(const char *input __maybe_unused,
> +			    int output __maybe_unused)
> +{
> +	return -1;
> +}
> +
> +static const struct {
> +	const char *fmt;
> +	int (*decompress)(const char *input, int output);
> +} compressions[] = {
> +	{ "gz", decompress_dummy },
> +};
> +
> +bool is_supported_compression(const char *ext)
> +{
> +	unsigned i;
> +
> +	for (i = 0; i < ARRAY_SIZE(compressions); i++) {
> +		if (!strcmp(ext, compressions[i].fmt))
> +			return true;
> +	}
> +	return false;
> +}
> +
> +bool is_kmodule_extension(const char *ext)
> +{
> +	if (!strcmp(ext, "ko"))
> +		return true;
> +
> +	if (ext[2] == '\0' || (ext[2] == '.' && is_supported_compression(ext+3)))
> +		return true;

I got stuck in here.. so any 2 chars string is kernel module extension?
plus how do u know ext[3] (or [2]) is valid memory?

thanks,
jirka
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