linux-kernel - Re: [PATCH v2] tools/perf: allow overriding sysfs and proc finding with env var

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Date:	Thu, 17 Apr 2014 20:04:52 +0200
From:	Jiri Olsa <jolsa@...hat.com>
To:	Cody P Schafer <cody@...ux.vnet.ibm.com>
Cc:	Arnaldo Carvalho de Melo <acme@...hat.com>,
	Borislav Petkov <bp@...e.de>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2] tools/perf: allow overriding sysfs and proc finding
 with env var

On Wed, Apr 16, 2014 at 01:39:46PM -0700, Cody P Schafer wrote:

SNIP

> +
> +/*
> + * Check for "NAME_PATH" environment variable to override fs location (for
> + * testing). This matches the recommendation in Documentation/sysfs-rules.txt
> + * for SYSFS_PATH.
> + */
> +static bool fs__env_override(struct fs *fs)
> +{
> +	char *override_path;
> +	size_t name_len = strlen(fs->name);
> +	/* name + "_PATH" + '\0' */
> +	char upper_name[name_len + 5 + 1];
> +	memcpy(upper_name, fs->name, name_len);
> +	mem_toupper(upper_name, name_len);
> +	strcpy(&upper_name[name_len], "_PATH");
> +
> +	override_path = getenv(upper_name);
> +	if (!override_path)
> +		return false;
> +
> +	fs->found = true;
> +	strcpy(fs->path, override_path);

please use strncpy with size of fs->path

thanks,
jirka
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