linux-kernel - Re: [PATCH v6 4/4] efivarfs: automatically update super block flag

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Message-ID: <5fe03be6-8c95-0bfa-687d-68e7ddffd97c@siemens.com>
Date:   Thu, 22 Jun 2023 16:58:50 +0200
From:   Jan Kiszka <jan.kiszka@...mens.com>
To:     Masahisa Kojima <masahisa.kojima@...aro.org>,
        Ard Biesheuvel <ardb@...nel.org>,
        Jens Wiklander <jens.wiklander@...aro.org>,
        Sumit Garg <sumit.garg@...aro.org>,
        linux-kernel@...r.kernel.org, op-tee@...ts.trustedfirmware.org
Cc:     Ilias Apalodimas <ilias.apalodimas@...aro.org>,
        Johan Hovold <johan+linaro@...nel.org>,
        Jeremy Kerr <jk@...abs.org>, linux-efi@...r.kernel.org
Subject: Re: [PATCH v6 4/4] efivarfs: automatically update super block flag

On 22.06.23 10:51, Masahisa Kojima wrote:
> efivar operation is updated when the tee_stmm_efi module is probed.
> tee_stmm_efi module supports SetVariable runtime service,
> but user needs to manually remount the efivarfs as RW to enable
> the write access if the previous efivar operation does not support
> SerVariable and efivarfs is mounted as read-only.
> 
> This commit notifies the update of efivar operation to
> efivarfs subsystem, then drops SB_RDONLY flag if the efivar
> operation supports SetVariable.

But it does not re-add it and prevents further requests to the TA (that
will only cause panics there) when the daemon terminates, does it?

Jan

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