linux-kernel - Re: [bpf-next 3/3] bpf: Fix a use after free in bpf

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Message-ID: <CAADnVQJ0Q0dLVs5UM-CyJe90N+KHomccAy-S_LOOARa9nXkXsA@mail.gmail.com>
Date:   Wed, 7 Jul 2021 20:09:36 -0700
From:   Alexei Starovoitov <alexei.starovoitov@...il.com>
To:     He Fengqing <hefengqing@...wei.com>
Cc:     Song Liu <song@...nel.org>, Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Andrii Nakryiko <andrii@...nel.org>,
        Martin KaFai Lau <kafai@...com>,
        Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>,
        John Fastabend <john.fastabend@...il.com>,
        KP Singh <kpsingh@...nel.org>,
        "David S . Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Networking <netdev@...r.kernel.org>, bpf <bpf@...r.kernel.org>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [bpf-next 3/3] bpf: Fix a use after free in bpf_check()

On Wed, Jul 7, 2021 at 8:00 PM He Fengqing <hefengqing@...wei.com> wrote:
>
> Ok, I will change this in next version.

before you spam the list with the next version
please explain why any of these changes are needed?
I don't see an explanation in the patches and I don't see a bug in the code.
Did you check what is the prog clone ?
When is it constructed? Why verifier has anything to do with it?