netdev - Re: [PATCH 1/3] bpf: allow zero-initializing hash map seed

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <CACAyw98ZikQHU7VHnioUi6tXX5tq9+UyGS5+zQjF_6wJ1tHRqw@mail.gmail.com>
Date:   Mon, 8 Oct 2018 10:48:29 +0100
From:   Lorenz Bauer <lmb@...udflare.com>
To:     Alexei Starovoitov <alexei.starovoitov@...il.com>
Cc:     Jann Horn <jannh@...gle.com>, Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>, netdev@...r.kernel.org,
        linux-api@...r.kernel.org
Subject: Re: [PATCH 1/3] bpf: allow zero-initializing hash map seed

On Fri, 5 Oct 2018 at 22:07, Alexei Starovoitov
<alexei.starovoitov@...il.com> wrote:
>
> On Fri, Oct 05, 2018 at 04:27:58PM +0200, Jann Horn wrote:
> >
> > Can you please describe exactly why something that is not a kernel
> > unit test needs deterministic BPF hash map behavior?
>
> my use case for deterministic hashing is performance analysis.
> Both while developing and tuning bpf program and while optimizing
> kernel side implementation.
> Local dos is a valid concern, so requiring root for this flag makes sense.
>

Ok, I'll respin and address the comments.

-- 
Lorenz Bauer  |  Systems Engineer
25 Lavington St., London SE1 0NZ

www.cloudflare.com