linux-kernel - Re: [PATCH] pktgen: Remove a dangerous debug print.

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Message-Id: <20101027.122143.02260950.davem@davemloft.net>
Date:	Wed, 27 Oct 2010 12:21:43 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	nelhage@...lice.com
Cc:	robert.olsson@....uu.se, linux-kernel@...r.kernel.org,
	netdev@...r.kernel.org, eugene@...hat.com
Subject: Re: [PATCH] pktgen: Remove a dangerous debug print.

From: Nelson Elhage <nelhage@...lice.com>
Date: Wed, 27 Oct 2010 15:13:08 -0400

> We were allocating an arbitrarily-large buffer on the stack, which would allow a
> buggy or malicious userspace program to overflow the kernel stack.
> 
> Since the debug printk() was just printing exactly the text passed from
> userspace, it's probably just as easy for anyone who might use it to augment (or
> just strace(1)) the program writing to the pktgen file, so let's just not bother
> trying to print the whole buffer.
> 
> Signed-off-by: Nelson Elhage <nelhage@...lice.com>

Only root can write to the pktgen control file.

Also, the debug feature really is used by people's pktgen scripts, you
can't just turn it off.
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