From: Alan Cox <gnomes@lxorguk.ukuu.org.uk>
To: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>,
"Luck, Tony" <tony.luck@intel.com>,
Joe Konno <joe.konno@linux.intel.com>,
"linux-efi@vger.kernel.org" <linux-efi@vger.kernel.org>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
Matthew Garrett <matthew.garrett@nebula.com>,
Jeremy Kerr <jk@ozlabs.org>, Andi Kleen <ak@linux.intel.com>,
Matthew Garrett <mjg59@google.com>,
Peter Jones <pjones@redhat.com>,
Andy Lutomirski <luto@kernel.org>,
James Bottomley <james.bottomley@hansenpartnership.com>
Subject: Re: [PATCH 1/2] fs/efivarfs: restrict inode permissions
Date: Sat, 24 Feb 2018 20:06:17 +0000 [thread overview]
Message-ID: <20180224200617.75cfe5f2@alans-desktop> (raw)
In-Reply-To: <CAKv+Gu--iHii9SxE7RMZKdVdLvQPPGo0wdCzG30xW0+7dakbmw@mail.gmail.com>
On Wed, 21 Feb 2018 09:03:00 +0000
> The thing I like about rate limiting (for everyone including root) is
> that it does not break anybody's workflow (unless EFI variable access
> occurs on a hot path, in which case you're either a) asking for it, or
> b) the guy trying to DoS us), and that it can make exploitation of any
> potential Spectre v1 vulnerabilities impractical at the same time. At
b) doesn't make spectre v1 much harder alas. What matters there is that
you turn on the right CPU protections before calling into EFI and turn
them off afterwards. EFI firmware internally isn't built with retpoline
anyway.
Alan
next prev parent reply other threads:[~2018-02-24 20:07 UTC|newest]
Thread overview: 71+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-02-15 18:22 [PATCH 0/2] efivars: reading variables can generate SMIs Joe Konno
2018-02-15 18:22 ` [PATCH 1/2] fs/efivarfs: restrict inode permissions Joe Konno
2018-02-20 19:18 ` Andy Lutomirski
2018-02-20 21:18 ` Luck, Tony
2018-02-20 21:22 ` Matthew Garrett
2018-02-20 21:32 ` Luck, Tony
2018-02-20 21:35 ` Matthew Garrett
2018-02-20 22:01 ` Linus Torvalds
2018-02-20 23:30 ` Luck, Tony
2018-02-20 23:39 ` Matthew Garrett
2018-02-20 23:50 ` Luck, Tony
2018-02-21 0:49 ` Linus Torvalds
2018-02-21 1:05 ` Luck, Tony
2018-02-21 2:16 ` Linus Torvalds
2018-02-21 9:03 ` Ard Biesheuvel
2018-02-21 18:02 ` Linus Torvalds
2018-02-21 18:21 ` Andi Kleen
2018-02-21 19:47 ` Luck, Tony
2018-02-21 19:50 ` Linus Torvalds
2018-02-21 19:58 ` Luck, Tony
2018-02-21 20:40 ` Linus Torvalds
2018-02-22 1:45 ` [PATCH] efivarfs: Limit the rate for non-root to read files Luck, Tony
2018-02-22 1:58 ` Linus Torvalds
2018-02-22 5:34 ` Luck, Tony
2018-02-22 17:10 ` Eric W. Biederman
[not found] ` <CA+55aFy0hRexJkLbN7t31LjfGr4Ae0W5g6sBMqHHJi8aYuGKeA@mail.gmail.com>
[not found] ` <612E894E-62C8-4155-AED8-D53702EDC8DC@intel.com>
[not found] ` <CA+55aFxeBaTbwvbWqx1MKYjKKzLUs=1O43Bx2=JaO8qrnY-8HA@mail.gmail.com>
2018-02-22 17:15 ` [PATCH v2] " Luck, Tony
2018-02-22 17:39 ` Linus Torvalds
2018-02-22 17:54 ` Luck, Tony
2018-02-22 18:07 ` Linus Torvalds
2018-02-22 18:08 ` Ard Biesheuvel
2018-02-23 20:34 ` Andy Lutomirski
2018-02-23 19:47 ` [PATCH] " Peter Jones
2018-02-21 19:52 ` [PATCH 1/2] fs/efivarfs: restrict inode permissions Linus Torvalds
2018-02-24 20:06 ` Alan Cox [this message]
2018-02-25 10:56 ` Ard Biesheuvel
2018-02-21 0:49 ` Peter Jones
2018-02-20 23:19 ` Andy Lutomirski
[not found] ` <20180215182208.35003-1-joe.konno-VuQAYsv1563Yd54FQh9/CA@public.gmane.org>
2018-02-15 18:22 ` [PATCH 2/2] efi: restrict top-level attribute permissions Joe Konno
2018-02-15 18:22 ` Joe Konno
2018-02-16 10:41 ` [PATCH 0/2] efivars: reading variables can generate SMIs Ard Biesheuvel
2018-02-16 10:55 ` Borislav Petkov
2018-02-16 10:58 ` Ard Biesheuvel
2018-02-16 11:08 ` Borislav Petkov
[not found] ` <20180216110821.GB29042-fF5Pk5pvG8Y@public.gmane.org>
2018-02-16 11:18 ` Ard Biesheuvel
2018-02-16 11:18 ` Ard Biesheuvel
[not found] ` <CAKv+Gu_SD6yWJMGbTwGUWXtrgZKPkpANNaGe1PUruTG9j0yhcg-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2018-02-16 18:48 ` Joe Konno
2018-02-16 18:48 ` Joe Konno
2018-02-16 18:58 ` Borislav Petkov
2018-02-16 19:22 ` Peter Jones
2018-02-16 19:31 ` Ard Biesheuvel
[not found] ` <CAKv+Gu9=wny1J+-tZCdoGYUSZjfWgbiB9b_MdgpssdcTVXtKkA-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2018-02-16 19:51 ` Matthew Garrett
2018-02-16 19:51 ` Matthew Garrett
2018-02-16 19:32 ` Luck, Tony
2018-02-16 19:54 ` Peter Jones
[not found] ` <CAKv+Gu80pJ5tbGoJqBm8CCKrEZXdkE83c944383KbQ5jREUC0Q-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2018-02-16 20:51 ` James Bottomley
2018-02-16 20:51 ` James Bottomley
[not found] ` <1518814319.4419.10.camel-d9PhHud1JfjCXq6kfMZ53/egYHeGw8Jk@public.gmane.org>
2018-02-16 21:09 ` Luck, Tony
2018-02-16 21:09 ` Luck, Tony
2018-02-16 21:45 ` Andy Lutomirski
2018-02-16 21:58 ` Matthew Garrett
[not found] ` <CACdnJutPvMPUTWWjS3oRadQAqn+HpRpY+fhO0pXBj6OsQkAAag-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2018-02-16 22:02 ` Luck, Tony
2018-02-16 22:02 ` Luck, Tony
[not found] ` <3908561D78D1C84285E8C5FCA982C28F7B3795A3-8oqHQFITsIHTXloPLtfHfbfspsVTdybXVpNB7YpNyf8@public.gmane.org>
2018-02-16 22:03 ` Matthew Garrett
2018-02-16 22:03 ` Matthew Garrett
[not found] ` <CACdnJuvR4NTdCwp=jT3AoW898EXuq6zakfo5hm6dd9mP-SWoGQ-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2018-02-17 18:12 ` Andy Lutomirski
2018-02-17 18:12 ` Andy Lutomirski
2018-02-16 22:05 ` Peter Jones
[not found] ` <20180216220536.liew4p4kqmaxwmfh-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2018-02-17 9:36 ` Ard Biesheuvel
2018-02-17 9:36 ` Ard Biesheuvel
[not found] ` <CAKv+Gu982mt==TaBRpwLLOLrX03zVJ+RznqCgDrxGNctJUVQVA-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2018-02-17 16:17 ` Andi Kleen
2018-02-17 16:17 ` Andi Kleen
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