linux-kernel - Re: [PATCH bpf-next v2 4/7] bpf: Attachment verification for BPF_MODIFY

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Message-ID: <CAEf4BzZdR-PTFZT5VJ7kMw=FNhsCUpbQvdypEWSF1JNuaye6Kw@mail.gmail.com>
Date:   Tue, 3 Mar 2020 21:12:57 -0800
From:   Andrii Nakryiko <andrii.nakryiko@...il.com>
To:     KP Singh <kpsingh@...omium.org>
Cc:     linux-security-module@...r.kernel.org,
        open list <linux-kernel@...r.kernel.org>,
        bpf <bpf@...r.kernel.org>, Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Paul Turner <pjt@...gle.com>, Jann Horn <jannh@...gle.com>,
        Florent Revest <revest@...omium.org>,
        Brendan Jackman <jackmanb@...omium.org>
Subject: Re: [PATCH bpf-next v2 4/7] bpf: Attachment verification for BPF_MODIFY_RETURN

On Tue, Mar 3, 2020 at 5:56 PM KP Singh <kpsingh@...omium.org> wrote:
>
> From: KP Singh <kpsingh@...gle.com>
>
> - Allow BPF_MODIFY_RETURN attachment only to functions that are:
>
>     * Whitelisted by for error injection i.e. by checking
>       within_error_injection_list. Similar disucssions happened for the
>       bpf_overrie_return helper.

2 typos: discussions and bpf_override_return ;)

>
>     * security hooks, this is expected to be cleaned up with the LSM
>       changes after the KRSI patches introduce the LSM_HOOK macro:
>
>         https://lore.kernel.org/bpf/20200220175250.10795-1-kpsingh@chromium.org/
>
> - The attachment is currently limited to functions that return an int.
>   This can be extended later other types (e.g. PTR).
>
> Signed-off-by: KP Singh <kpsingh@...gle.com>
> ---

Acked-by: Andrii Nakryiko <andriin@...com>

>  kernel/bpf/btf.c      | 28 ++++++++++++++++++++--------
>  kernel/bpf/verifier.c | 31 +++++++++++++++++++++++++++++++
>  2 files changed, 51 insertions(+), 8 deletions(-)
>

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