linux-kernel - Re: [PATCH bpf-next v1 06/13] bpf: lsm: Init Hooks and create files in securityfs

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Message-ID: <201912301119.B475C474@keescook>
Date:   Mon, 30 Dec 2019 11:20:39 -0800
From:   Kees Cook <keescook@...omium.org>
To:     KP Singh <kpsingh@...omium.org>
Cc:     Andrii Nakryiko <andrii.nakryiko@...il.com>,
        open list <linux-kernel@...r.kernel.org>,
        bpf <bpf@...r.kernel.org>, linux-security-module@...r.kernel.org,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        James Morris <jmorris@...ei.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 06/13] bpf: lsm: Init Hooks and create files
 in securityfs

On Mon, Dec 30, 2019 at 04:37:11PM +0100, KP Singh wrote:
> On 23-Dec 22:28, Andrii Nakryiko wrote:
> > On Fri, Dec 20, 2019 at 7:43 AM KP Singh <kpsingh@...omium.org> wrote:
> > [...]
> 
> Good catch! You're right. These macros will not be there in v2 as
> we move to using trampolines based callbacks.

Speaking of which -- is the BPF trampoline code correctly designed to be
W^X?

-- 
Kees Cook