linux-kernel - Re: [PATCH 1/2] fs/efivarfs: restrict inode permissions

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Message-ID: <CACdnJusL1Vj_rvhZY+0_KZkrk=fwnQcr1y+vxOBmUXa4xdHHsg@mail.gmail.com>
Date:   Tue, 20 Feb 2018 21:22:29 +0000
From:   Matthew Garrett <mjg59@...gle.com>
To:     tony.luck@...el.com
Cc:     Linus Torvalds <torvalds@...ux-foundation.org>,
        joe.konno@...ux.intel.com, linux-efi <linux-efi@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Ard Biesheuvel <ard.biesheuvel@...aro.org>,
        matthew.garrett@...ula.com, Jeremy Kerr <jk@...abs.org>,
        ak@...ux.intel.com, pjones@...hat.com, luto@...nel.org,
        James Bottomley <james.bottomley@...senpartnership.com>
Subject: Re: [PATCH 1/2] fs/efivarfs: restrict inode permissions

On Tue, Feb 20, 2018 at 1:18 PM Luck, Tony <tony.luck@...el.com> wrote:

> Does this rate an exception to the "don't break userspace" for a security
issue?

To be clear, when you say "security" is this in reference to it being a
denial of service, or are you worried about other interactions that may
cause wider security issues?