linux-kernel - Re: [PATCH 11/18] staging: gasket: always allow root open for write

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Date:   Sat, 14 Jul 2018 11:25:47 +0300
From:   Dmitry Torokhov <dtor@...omium.org>
To:     toddpoynor@...il.com
Cc:     rspringer@...gle.com, jnjoseph@...gle.com, benchan@...omium.org,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        frankhu@...omium.org, Simon Que <sque@...omium.org>,
        Guenter Roeck <groeck@...omium.org>,
        devel@...verdev.osuosl.org, lkml <linux-kernel@...r.kernel.org>,
        toddpoynor@...gle.com
Subject: Re: [PATCH 11/18] staging: gasket: always allow root open for write

On Sat, Jul 14, 2018 at 8:58 AM Todd Poynor <toddpoynor@...il.com> wrote:
>
> From: Todd Poynor <toddpoynor@...gle.com>
>
> Always allow root to open device for writing.
>
> Drop special-casing of ioctl permissions for root vs. owner.
>
> Reported-by: Dmitry Torokhov <dtor@...omium.org>
> Signed-off-by: Zhongze Hu <frankhu@...omium.org>
> Signed-off-by: Todd Poynor <toddpoynor@...gle.com>

I think this patch is good as is, but as a followup you should create
a patch that supports user namespaces, i.e. replaces
capable(CAP_SYS_ADMIN) with ns_capable(...) in gasket_open() so you
can allow containers to control the device, if necessary.

Reviewed-by: Dmitry Torokhov <dtor@...omium.org>

Thanks,
Dmitry