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Date:   Tue, 12 Jan 2021 21:21:48 +0100
From:   Daniel Borkmann <>
To:     Andrii Nakryiko <>,
        Gilad Reti <>
Cc:     bpf <>, Alexei Starovoitov <>,
        Andrii Nakryiko <>,
        Martin KaFai Lau <>,
        Song Liu <>, Yonghong Song <>,
        John Fastabend <>,
        KP Singh <>,
        Networking <>,
        open list <>
Subject: Re: [PATCH bpf 1/2] bpf: support PTR_TO_MEM{,_OR_NULL} register

On 1/12/21 8:46 PM, Andrii Nakryiko wrote:
> On Tue, Jan 12, 2021 at 1:14 AM Gilad Reti <> wrote:
>> Add support for pointer to mem register spilling, to allow the verifier
>> to track pointer to valid memory addresses. Such pointers are returned
>> for example by a successful call of the bpf_ringbuf_reserve helper.
>> This patch was suggested as a solution by Yonghong Song.
>> The patch was partially contibuted by CyberArk Software, Inc.
>> Fixes: 457f44363a88 ("bpf: Implement BPF ring buffer and verifier
>> support for it")
> Surprised no one mentioned this yet. Fixes tag should always be on a
> single unwrapped line, however long it is, please fix.

Especially for first-time contributors there is usually some luxury that we
would have fixed this up on the fly while applying. ;) But given a v2 is going
to be sent anyway it's good to point it out for future reference, agree.


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