netdev - Re: [PATCHv2] net: bpf: reject invalid shifts

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Message-Id: <20160112.214315.2135966842775837844.davem@davemloft.net>
Date:	Tue, 12 Jan 2016 21:43:15 -0500 (EST)
From:	David Miller <davem@...emloft.net>
To:	eric.dumazet@...il.com
Cc:	alexei.starovoitov@...il.com, daniel@...earbox.net, rabin@....in,
	netdev@...r.kernel.org, ast@...nel.org,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCHv2] net: bpf: reject invalid shifts

From: Eric Dumazet <eric.dumazet@...il.com>
Date: Tue, 12 Jan 2016 18:11:38 -0800

> As I said, it is possible some guys never noticed their BPF program
> were 'broken' because this invalid shift was hidden in a dead code
> part.

We should not hide bugs and unintended uses of operations with
undefined behavior.