netdev - Re: [PATCH bpf-next v5 2/8] bpf: verifier: refactor check_attach_btf

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Message-ID: <87tuvxph0a.fsf@toke.dk>
Date:   Wed, 16 Sep 2020 23:07:49 +0200
From:   Toke Høiland-Jørgensen <toke@...hat.com>
To:     Andrii Nakryiko <andrii.nakryiko@...il.com>
Cc:     Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Martin KaFai Lau <kafai@...com>,
        Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>,
        Andrii Nakryiko <andriin@...com>,
        John Fastabend <john.fastabend@...il.com>,
        Jiri Olsa <jolsa@...hat.com>,
        Eelco Chaudron <echaudro@...hat.com>,
        KP Singh <kpsingh@...omium.org>,
        Networking <netdev@...r.kernel.org>, bpf <bpf@...r.kernel.org>
Subject: Re: [PATCH bpf-next v5 2/8] bpf: verifier: refactor
 check_attach_btf_id()

Andrii Nakryiko <andrii.nakryiko@...il.com> writes:

> On Tue, Sep 15, 2020 at 5:50 PM Toke Høiland-Jørgensen <toke@...hat.com> wrote:
>>
>> From: Toke Høiland-Jørgensen <toke@...hat.com>
>>
>> The check_attach_btf_id() function really does three things:
>>
>> 1. It performs a bunch of checks on the program to ensure that the
>>    attachment is valid.
>>
>> 2. It stores a bunch of state about the attachment being requested in
>>    the verifier environment and struct bpf_prog objects.
>>
>> 3. It allocates a trampoline for the attachment.
>>
>> This patch splits out (1.) and (3.) into separate functions in preparation
>> for reusing them when the actual attachment is happening (in the
>> raw_tracepoint_open syscall operation), which will allow tracing programs
>> to have multiple (compatible) attachments.
>>
>> No functional change is intended with this patch.
>>
>> Signed-off-by: Toke Høiland-Jørgensen <toke@...hat.com>
>> ---
>
> I almost acked this, but found a problem at the very last moment. See
> below, along with few more comments while I have enough context in my
> head.

Right, will fix, thanks!

> BTW, for whatever reason your patches arrived with a 12 hour delay
> yesterday (cover letter received at 5am, while patches arrived at
> 6pm), don't know if its vger or gmail...

Ugh, sorry about that. I think it's an interaction between vger and the
Red Hat corporate mail proxy - it's really a mess. I'll try switching my
patch submissions to use a different SMTP server...

-Toke