linux-kernel - Re: [PATCH bpf-next v2 4/4] selftest: bpf: Test copying a sockmap and sockhash

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Message-ID: <CACAyw9_wfD39OCKR5zMN4g=GjcYH31Dg7skoyhPVHVTspgvarA@mail.gmail.com>
Date:   Wed, 30 Sep 2020 10:37:53 +0100
From:   Lorenz Bauer <lmb@...udflare.com>
To:     Martin KaFai Lau <kafai@...com>
Cc:     Shuah Khan <shuah@...nel.org>, Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        kernel-team <kernel-team@...udflare.com>,
        "open list:KERNEL SELFTEST FRAMEWORK" 
        <linux-kselftest@...r.kernel.org>,
        Networking <netdev@...r.kernel.org>, bpf <bpf@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH bpf-next v2 4/4] selftest: bpf: Test copying a sockmap and sockhash

On Tue, 29 Sep 2020 at 18:23, Martin KaFai Lau <kafai@...com> wrote:

...

> > Yeah, I think so. We'd need to do something similar to your
> > sock_common work for PTR_TO_RDONLY_BUF_OR_NULL. The fact that the
> > pointer is read only makes it a bit more difficult I think. After
> I thought the key arg should be used as read-only in the map's helper.
> or there is map type's helper that modifies the key?

I don't know, that's what I meant by more difficult. If map keys are
always read-only like you say this would be straight forward to do
(famous last words).

-- 
Lorenz Bauer  |  Systems Engineer
6th Floor, County Hall/The Riverside Building, SE1 7PB, UK

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