linux-kernel - Re: [PATCH 11/17] Tools: hv: Gather DNS information

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Date:	Wed, 25 Jul 2012 00:38:09 +0100
From:	Ben Hutchings <ben@...adent.org.uk>
To:	"K. Y. Srinivasan" <kys@...rosoft.com>
Cc:	gregkh@...uxfoundation.org, linux-kernel@...r.kernel.org,
	devel@...uxdriverproject.org, virtualization@...ts.osdl.org,
	olaf@...fle.de, apw@...onical.com, netdev@...r.kernel.org
Subject: Re: [PATCH 11/17] Tools: hv: Gather DNS information

On Tue, Jul 24, 2012 at 09:01:35AM -0700, K. Y. Srinivasan wrote:
> Now gather DNS information. This information cannot be gathered in
> a distro independent fashion. Invoke an external script (that can be
> distro dependent) to gather the DNS information.
[...]
> +	memset(cmd, 0, sizeof(cmd));
> +	strcat(cmd, "/sbin/hv_get_dns_info ");
> +	strcat(cmd, if_name);
[...]

This is a weird way to build a string; why are you not using
snprintf()?  Not to mention that interface names can contain several
characters that are special to the shell - in fact the only disallowed
characters are / and whitespace.
 
Also, the external script will not be useful to anything other than
hv_kvp_daemon, so it probably belongs somewhere under /usr/share.
 
Ben.

-- 
Ben Hutchings
We get into the habit of living before acquiring the habit of thinking.
                                                              - Albert Camus
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