linux-kernel - Re: [PATCH 0/2] efivars: reading variables can generate SMIs

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Date:   Fri, 16 Feb 2018 19:51:27 +0000
From:   Matthew Garrett <mjg59@...gle.com>
To:     Ard Biesheuvel <ard.biesheuvel@...aro.org>
Cc:     pjones@...hat.com, joe.konno@...ux.intel.com, bp@...en8.de,
        mingo@...nel.org, luto@...nel.org,
        linux-efi <linux-efi@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        jk@...abs.org, ak@...ux.intel.com, tony.luck@...el.com,
        benjamin.drung@...fitbricks.com
Subject: Re: [PATCH 0/2] efivars: reading variables can generate SMIs

On Fri, Feb 16, 2018 at 11:31 AM Ard Biesheuvel <ard.biesheuvel@...aro.org>
wrote:
> This is why I was leaning towards applying these patches: not breaking
> userland is an important rule, but it does not imply every aspect of
> behavior observable by userland is set in stone. In other words, I
> agree with Peter that making this change does not *break* userland in
> a way anyone is likely to care deeply about.

In some modes tpmtotp will run as non-root and expect to be able to read an
EFI variable.