linux-kernel - Re: kasan for bpf

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Message-Id: <20171223.110356.169739765604909704.davem@davemloft.net>
Date:   Sat, 23 Dec 2017 11:03:56 -0500 (EST)
From:   David Miller <davem@...emloft.net>
To:     alexei.starovoitov@...il.com
Cc:     jannh@...gle.com, netdev@...r.kernel.org, daniel@...earbox.net,
        ben@...adent.org.uk, linux-kernel@...r.kernel.org,
        kernel-team@...com
Subject: Re: kasan for bpf

From: Alexei Starovoitov <alexei.starovoitov@...il.com>
Date: Fri, 22 Dec 2017 20:31:56 -0800

> Thoughts?

Even though you propose it as the opposite, it sounds like a crutch
for the verifier.

If we strictly control objects that the eBPF program can access,
verifier ensures this, and all other objects go through helpers,
then I cannot see what kasan for bpf can buy us.

To me it tells the world "yes, verifier and carefully designed helpers
are insufficient" and that's not the message I have been giving to
rooms full of hundreds of people listening to my xdp/bpf
presentations.