From: Matthew Garrett <mjg59@google.com>
To: Linus Torvalds <torvalds@linux-foundation.org>
Cc: luto@kernel.org, David Howells <dhowells@redhat.com>,
Ard Biesheuvel <ard.biesheuvel@linaro.org>,
jmorris@namei.org, Alan Cox <gnomes@lxorguk.ukuu.org.uk>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
jforbes@redhat.com, linux-man@vger.kernel.org, jlee@suse.com,
LSM List <linux-security-module@vger.kernel.org>,
linux-api@vger.kernel.org, Kees Cook <keescook@chromium.org>,
linux-efi <linux-efi@vger.kernel.org>
Subject: Re: [GIT PULL] Kernel lockdown for secure boot
Date: Tue, 03 Apr 2018 22:51:11 +0000 [thread overview]
Message-ID: <CACdnJusSfwULV-ubvgtYd8G_cTF4LnJ4DAeTCux4XRhHKVpBUw@mail.gmail.com> (raw)
In-Reply-To: <CA+55aFxKzxdRZthzaokaGPAsWCp3a-p3aVfJSutF+9Fp9sbaVA@mail.gmail.com>
On Tue, Apr 3, 2018 at 3:46 PM Linus Torvalds
<torvalds@linux-foundation.org>
wrote:
> For example, I love signed kernel modules. The fact that I love them
> has absolutely zero to do with secure boot, though. There is
> absolutely no linkage between the two issues: I use (self-)signed
> kernel modules simply because I think it's a good thing in general.
> The same thing is true of some lockdown patch. Maybe it's a good thing
> in general. But whether it's a good thing is _entirely_ independent of
> any secure boot issue. I can see using secure boot without it, but I
> can very much also see using lockdown without secure boot.
> The two things are simply entirely orthogonal. They have _zero_
> overlap. I'm not seeing why they'd be linked at all in any way.
Lockdown is clearly useful without Secure Boot (and I intend to deploy it
that way for various things), but I still don't understand why you feel
that the common case of booting a kernel from a boot chain that's widely
trusted derives no benefit from it being harder to subvert that kernel into
subverting that boot chain. For cases where you're self-signing and feel
happy about that, you just set CONFIG_LOCK_DOWN_IN_EFI_SECURE_BOOT to n and
everyone's happy?
next prev parent reply other threads:[~2018-04-03 22:51 UTC|newest]
Thread overview: 112+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <4136.1522452584@warthog.procyon.org.uk>
[not found] ` <alpine.LRH.2.21.1803311145180.7769@namei.org>
2018-04-03 0:37 ` [GIT PULL] Kernel lockdown for secure boot Andy Lutomirski
2018-04-03 0:59 ` Kees Cook
2018-04-03 1:47 ` Andy Lutomirski
2018-04-03 7:06 ` David Howells
2018-04-03 15:11 ` Andy Lutomirski
2018-04-03 15:41 ` Alexei Starovoitov
2018-04-03 16:26 ` Andy Lutomirski
2018-04-03 16:29 ` Matthew Garrett
2018-04-03 16:45 ` Andy Lutomirski
[not found] ` <CAGXu5j+CyVXEvsMarJjBwaNh7poVZtmit5PGmQM9rKKqZPqVXg@mail.gmail.com>
2018-04-03 19:01 ` Andy Lutomirski
2018-04-03 19:07 ` Kees Cook
2018-04-03 19:29 ` Matthew Garrett
2018-04-03 21:51 ` Andy Lutomirski
2018-04-04 18:42 ` Peter Jones
2018-04-04 20:01 ` Thomas Gleixner
2018-04-04 20:18 ` Matthew Garrett
2018-04-05 18:47 ` Andy Lutomirski
2018-04-06 4:42 ` Peter Dolding
2018-04-03 17:16 ` David Howells
2018-04-03 19:01 ` Andy Lutomirski
2018-04-03 19:49 ` David Howells
2018-04-03 21:58 ` Andy Lutomirski
2018-04-03 22:32 ` David Howells
2018-04-03 22:39 ` Andy Lutomirski
2018-04-03 22:46 ` Linus Torvalds
2018-04-03 22:51 ` Matthew Garrett [this message]
2018-04-03 22:53 ` Andy Lutomirski
2018-04-03 23:09 ` Matthew Garrett
2018-04-03 23:08 ` Linus Torvalds
2018-04-03 23:10 ` Linus Torvalds
2018-04-03 23:17 ` Matthew Garrett
2018-04-03 23:26 ` Linus Torvalds
2018-04-03 23:39 ` Linus Torvalds
2018-04-03 23:47 ` Matthew Garrett
2018-04-04 0:02 ` Linus Torvalds
2018-04-04 0:04 ` Matthew Garrett
2018-04-04 0:08 ` Linus Torvalds
2018-04-04 0:12 ` Matthew Garrett
2018-04-05 14:58 ` Alan Cox
2018-04-04 0:22 ` David Howells
2018-04-05 17:59 ` Alan Cox
2018-04-05 18:03 ` Matthew Garrett
2018-04-03 23:45 ` Matthew Garrett
2018-04-03 23:55 ` Linus Torvalds
2018-04-03 23:59 ` Matthew Garrett
2018-04-04 0:06 ` Linus Torvalds
2018-04-04 0:10 ` Matthew Garrett
2018-04-04 0:15 ` Linus Torvalds
2018-04-04 0:16 ` Matthew Garrett
2018-04-04 0:18 ` Andy Lutomirski
2018-04-04 0:19 ` Matthew Garrett
2018-04-04 9:04 ` Greg Kroah-Hartman
2018-04-04 0:25 ` Linus Torvalds
2018-04-04 0:33 ` Linus Torvalds
2018-04-04 0:46 ` Matthew Garrett
2018-04-04 0:56 ` Linus Torvalds
2018-04-04 1:13 ` Matthew Garrett
2018-04-04 1:43 ` Linus Torvalds
2018-04-04 4:30 ` Matthew Garrett
2018-04-04 12:57 ` Theodore Y. Ts'o
2018-04-04 13:02 ` Greg Kroah-Hartman
2018-04-04 13:34 ` Theodore Y. Ts'o
2018-04-04 13:57 ` Greg Kroah-Hartman
2018-04-04 13:29 ` Mike Galbraith
2018-04-04 16:20 ` Matthew Garrett
2018-04-08 22:00 ` Pavel Machek
2018-04-04 13:33 ` David Howells
2018-04-04 13:52 ` Theodore Y. Ts'o
2018-04-04 16:22 ` Matthew Garrett
2018-04-04 16:39 ` Andy Lutomirski
2018-04-04 16:42 ` Matthew Garrett
2018-04-04 16:46 ` Justin Forbes
2018-04-05 0:05 ` Peter Dolding
2018-04-05 0:20 ` Matthew Garrett
2018-04-04 13:57 ` David Howells
2018-04-04 16:09 ` Linus Torvalds
2018-04-04 16:17 ` Matthew Garrett
2018-04-04 6:56 ` Peter Dolding
2018-04-04 16:26 ` Matthew Garrett
2018-04-05 1:28 ` Peter Dolding
2018-04-04 1:36 ` Justin Forbes
[not found] ` <CAFbkSA0ursG3RGWU19LQiD6u30h5V=Aqj3oVyHQCiX6MLopYUg@mail.gmail.com>
2018-04-04 1:58 ` Linus Torvalds
2018-04-04 0:17 ` Jann Horn
2018-04-04 0:23 ` Andy Lutomirski
2018-04-04 8:05 ` David Howells
2018-04-04 14:35 ` Andy Lutomirski
2018-04-04 14:44 ` David Howells
2018-04-04 15:43 ` Eric W. Biederman
2018-04-03 23:56 ` David Howells
2018-04-03 23:58 ` Linus Torvalds
2018-04-03 23:39 ` David Howells
2018-04-03 23:48 ` Andy Lutomirski
2018-04-08 8:23 ` Pavel Machek
2018-04-03 23:12 ` David Howells
2018-04-03 23:27 ` Linus Torvalds
2018-04-03 23:42 ` Andy Lutomirski
2018-04-03 20:53 ` Linus Torvalds
2018-04-03 20:54 ` Matthew Garrett
2018-04-03 21:01 ` Linus Torvalds
2018-04-03 21:08 ` Matthew Garrett
2018-04-03 21:21 ` Al Viro
2018-04-03 21:37 ` Matthew Garrett
2018-04-03 21:26 ` Linus Torvalds
2018-04-03 21:32 ` Matthew Garrett
2018-04-08 8:10 ` Pavel Machek
2018-04-04 2:34 Alexei Starovoitov
2018-04-04 4:31 ` Matthew Garrett
2018-04-08 7:44 ` joeyli
2018-04-08 8:07 ` joeyli
2018-04-09 3:40 ` Alexei Starovoitov
2018-04-09 8:14 ` Daniel Borkmann
2018-04-09 13:55 ` joeyli
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=CACdnJusSfwULV-ubvgtYd8G_cTF4LnJ4DAeTCux4XRhHKVpBUw@mail.gmail.com \
--to=mjg59@google.com \
--cc=ard.biesheuvel@linaro.org \
--cc=dhowells@redhat.com \
--cc=gnomes@lxorguk.ukuu.org.uk \
--cc=gregkh@linuxfoundation.org \
--cc=jforbes@redhat.com \
--cc=jlee@suse.com \
--cc=jmorris@namei.org \
--cc=keescook@chromium.org \
--cc=linux-api@vger.kernel.org \
--cc=linux-efi@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-man@vger.kernel.org \
--cc=linux-security-module@vger.kernel.org \
--cc=luto@kernel.org \
--cc=torvalds@linux-foundation.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).