linux-kernel - Re: [PATCH bpf-next 0/3] bpf: add signature

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Date:   Fri, 3 Dec 2021 11:37:56 -0800
From:   Alexei Starovoitov <alexei.starovoitov@...il.com>
To:     Matteo Croce <mcroce@...ux.microsoft.com>
Cc:     bpf <bpf@...r.kernel.org>, LKML <linux-kernel@...r.kernel.org>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Andrii Nakryiko <andrii@...nel.org>,
        Arnaldo Carvalho de Melo <acme@...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>,
        Jakub Kicinski <kuba@...nel.org>,
        Jesper Dangaard Brouer <hawk@...nel.org>,
        keyrings@...r.kernel.org,
        Linux Crypto Mailing List <linux-crypto@...r.kernel.org>,
        Luca Boccassi <bluca@...ian.org>,
        Lorenzo Bianconi <lorenzo@...nel.org>
Subject: Re: [PATCH bpf-next 0/3] bpf: add signature

On Fri, Dec 3, 2021 at 11:36 AM Matteo Croce <mcroce@...ux.microsoft.com> wrote:
>
> On Fri, Dec 3, 2021 at 8:22 PM Alexei Starovoitov
> <alexei.starovoitov@...il.com> wrote:
> >
> > On Fri, Dec 3, 2021 at 11:18 AM Matteo Croce <mcroce@...ux.microsoft.com> wrote:
> > >
> > > From: Matteo Croce <mcroce@...rosoft.com>
> > >
> > > This series add signature verification for BPF files.
> > > The first patch implements the signature validation in the kernel,
> > > the second patch optionally makes the signature mandatory,
> > > the third adds signature generation to bpftool.
> >
> > Matteo,
> >
> > I think I already mentioned that it's no-go as-is.
> > We've agreed to go with John's suggestion.
>
> Hi,
>
> my previous attempt was loading a whole ELF file and parsing it in kernel.
> In this series I just validate the instructions against a signature,
> as with kernel CO-RE libbpf doesn't need to mangle it.
>
> Which suggestion? I think I missed this one..

This talk and discussion:
https://linuxplumbersconf.org/event/11/contributions/947/