netdev - Re: [PATCH 18/27] bpf: Restrict kernel image access functions when the kernel is locked down

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Message-ID: <21228.1508770278@warthog.procyon.org.uk>
Date:   Mon, 23 Oct 2017 15:51:18 +0100
From:   David Howells <dhowells@...hat.com>
To:     Alexei Starovoitov <alexei.starovoitov@...il.com>
Cc:     dhowells@...hat.com, jlee@...e.com, linux-kernel@...r.kernel.org,
        jforbes@...hat.com, Daniel Borkmann <daniel@...earbox.net>,
        "David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org,
        Gary Lin <GLin@...e.com>
Subject: Re: [PATCH 18/27] bpf: Restrict kernel image access functions when the kernel is locked down

Alexei Starovoitov <alexei.starovoitov@...il.com> wrote:

> If you want to lock down read access you'd need to disable
> not only bpf, but all of kprobe and likey ftrace, since
> untrusted root can infer kernel data by observing function
> execution even if it cannot load modules and bpf progs.

Okay.

David