linux-kernel - Re: [PATCH bpf-next v1 10/13] bpf: lsm: Handle attachment of the same program

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Date:   Thu, 9 Jan 2020 05:21:49 +1100 (AEDT)
From:   James Morris <jmorris@...ei.org>
To:     KP Singh <kpsingh@...omium.org>
cc:     linux-kernel@...r.kernel.org, bpf@...r.kernel.org,
        linux-security-module@...r.kernel.org,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Kees Cook <keescook@...omium.org>,
        Thomas Garnier <thgarnie@...omium.org>,
        Michael Halcrow <mhalcrow@...gle.com>,
        Paul Turner <pjt@...gle.com>,
        Brendan Gregg <brendan.d.gregg@...il.com>,
        Jann Horn <jannh@...gle.com>,
        Matthew Garrett <mjg59@...gle.com>,
        Christian Brauner <christian@...uner.io>,
        Mickaël Salaün <mic@...ikod.net>,
        Florent Revest <revest@...omium.org>,
        Brendan Jackman <jackmanb@...omium.org>,
        Martin KaFai Lau <kafai@...com>,
        Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>,
        "Serge E. Hallyn" <serge@...lyn.com>,
        Mauro Carvalho Chehab <mchehab+samsung@...nel.org>,
        "David S. Miller" <davem@...emloft.net>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Nicolas Ferre <nicolas.ferre@...rochip.com>,
        Stanislav Fomichev <sdf@...gle.com>,
        Quentin Monnet <quentin.monnet@...ronome.com>,
        Andrey Ignatov <rdna@...com>, Joe Stringer <joe@...d.net.nz>
Subject: Re: [PATCH bpf-next v1 10/13] bpf: lsm: Handle attachment of the
 same program

On Fri, 20 Dec 2019, KP Singh wrote:

> From: KP Singh <kpsingh@...gle.com>
> 
> Allow userspace to attach a newer version of a program without having
> duplicates of the same program.
> 
> If BPF_F_ALLOW_OVERRIDE is passed, the attachment logic compares the
> name of the new program to the names of existing attached programs. The
> names are only compared till a "__" (or '\0', if there is no "__"). If
> a successful match is found, the existing program is replaced with the
> newer attachment.
> 
> ./loader Attaches "env_dumper__v1" followed by "env_dumper__v2"
> to the bprm_check_security hook..
> 
> ./loader
> ./loader
> 
> Before:
> 
>   cat /sys/kernel/security/bpf/process_execution
>   env_dumper__v1
>   env_dumper__v2
> 
> After:
> 
>   cat /sys/kernel/security/bpf/process_execution
>   env_dumper__v2
> 
> Signed-off-by: KP Singh <kpsingh@...gle.com>


Reviewed-by: James Morris <jamorris@...ux.microsoft.com>


-- 
James Morris
<jmorris@...ei.org>