netdev - Re: Question about seccomp / bpf

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Message-ID: <CAGXu5jLVCSGyB7G2-PUBvGDYK5=HtNAUwyUyJCpgnmAvarpuMQ@mail.gmail.com>
Date:   Thu, 9 May 2019 16:49:19 -0700
From:   Kees Cook <keescook@...omium.org>
To:     Alexei Starovoitov <alexei.starovoitov@...il.com>
Cc:     Daniel Borkmann <daniel@...earbox.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Alexei Starovoitov <ast@...com>,
        netdev <netdev@...r.kernel.org>, bpf <bpf@...r.kernel.org>,
        Andy Lutomirski <luto@...capital.net>,
        Jann Horn <jannh@...gle.com>, Will Drewry <wad@...omium.org>
Subject: Re: Question about seccomp / bpf

On Thu, May 9, 2019 at 4:30 PM Alexei Starovoitov
<alexei.starovoitov@...il.com> wrote:
> I'm not sure how that can work. seccomp's prctl accepts a list of insns.
> There is no handle.
> kernel can keep a hashtable of all progs ever loaded and do a search
> in it before loading another one, but that's an ugly hack.
> Another alternative is to attach seccomp prog to parent task
> instead of N childrens.

seccomp's filter is already shared by all the children of whatever
process got the filter attached.

-- 
Kees Cook