linux-kernel - Re: bpf: undefined shift in __bpf_prog

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Message-Id: <20151204.142651.968075964630586979.davem@davemloft.net>
Date:	Fri, 04 Dec 2015 14:26:51 -0500 (EST)
From:	David Miller <davem@...emloft.net>
To:	alexei.starovoitov@...il.com
Cc:	dvyukov@...gle.com, ast@...nel.org, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org, syzkaller@...glegroups.com,
	kcc@...gle.com, glider@...gle.com, sasha.levin@...cle.com,
	edumazet@...gle.com, ryabinin.a.a@...il.com
Subject: Re: bpf: undefined shift in __bpf_prog_run

From: Alexei Starovoitov <alexei.starovoitov@...il.com>
Date: Fri, 4 Dec 2015 11:10:15 -0800

> just don't generate random bpf programs with such shifts.

Agreed, it is exactly the same as if the compiler emitted real cpu
shift instructions with undefined behavior.

The creator of the BPF code in question is what should be fixed.
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