netdev - Re: [PATCH net-next] tools: psock_lib: harden socket filter used by psock tests

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Message-Id: <20170112.105118.871474657291324075.davem@davemloft.net>
Date:   Thu, 12 Jan 2017 10:51:18 -0500 (EST)
From:   David Miller <davem@...emloft.net>
To:     sowmini.varadhan@...cle.com
Cc:     netdev@...r.kernel.org, daniel@...earbox.net, willemb@...gle.com
Subject: Re: [PATCH net-next] tools: psock_lib: harden socket filter used
 by psock tests

From: Sowmini Varadhan <sowmini.varadhan@...cle.com>
Date: Thu, 12 Jan 2017 05:10:11 -0800

> The filter added by sock_setfilter is intended to only permit
> packets matching the pattern set up by create_payload(), but
> we only check the ip_len, and a single test-character in
> the IP packet to ensure this condition.
> 
> Harden the filter by adding additional constraints so that we only
> permit UDP/IPv4 packets that meet the ip_len and test-character
> requirements. Include the bpf_asm src as a comment, in case this
> needs to be enhanced in the future
> 
> Signed-off-by: Sowmini Varadhan <sowmini.varadhan@...cle.com>

Applied, thanks.