netdev - Re: [Xen-devel] xennet_start

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Message-ID: <20170119184733.GJ22018@oracle.com>
Date:   Thu, 19 Jan 2017 13:47:33 -0500
From:   Sowmini Varadhan <sowmini.varadhan@...cle.com>
To:     David Miller <davem@...emloft.net>
Cc:     Paul.Durrant@...rix.com, konrad.wilk@...cle.com,
        wei.liu2@...rix.com, netdev@...r.kernel.org,
        xen-devel@...ts.xenproject.org
Subject: Re: [Xen-devel] xennet_start_xmit assumptions

On (01/19/17 11:37), David Miller wrote:
> 
> I thought we had code which made sure that at least a minimal
> link layer header was present in the SKB?
> 
> Specifically I'm talking about the dev_validate_header() check.
> That is supposed to protect us from these kinds of situations.

ah, but I run my pf_packet application as root, so I have 
capable(CAP_SYS_RAWIO), so I slip through the dev_validate_header()
check.

--Sowmini