netdev - Re: [PATCH][NETNS]: Fix arbitrary net_device-s corruptions on net

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Message-ID: <4821D4F3.7000307@fr.ibm.com>
Date:	Wed, 07 May 2008 18:12:35 +0200
From:	Daniel Lezcano <dlezcano@...ibm.com>
To:	Pavel Emelyanov <xemul@...nvz.org>
CC:	David Miller <davem@...emloft.net>,
	Linux Netdev List <netdev@...r.kernel.org>
Subject: Re: [PATCH][NETNS]: Fix arbitrary net_device-s corruptions on net_ns
 stop.

Pavel Emelyanov wrote:
>>> +		sprintf(fb_name, "dev%d", dev->ifindex);
>> The computed interface name can not exceed IFNAMSIZ, 3 ('dev') + 10 (max 
>> int) + 1 ('\0'). In this case there is no risk to corrupt the stack but 
>> may be it is more secure to change that to snprintf(fb_name, IFNAMSIZ, 
>> "dev%d", dev->ifindex), just in case, no ?
> 
> But you have just noticed, that "there is no risk to corrupt the stack"!
> What else can be "more secure" then :) ?

Just in case, for example, someone changes 'dev' by 'virtdev' or 
something else.
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