linux-kernel - Re: [PATCH 2/2] blk-zoned: allow BLKREPORTZONE without CAP_SYS

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Message-ID: <20210603095117.GU31483@twin.jikos.cz>
Date:   Thu, 3 Jun 2021 11:51:17 +0200
From:   David Sterba <dsterba@...e.cz>
To:     Niklas Cassel <Niklas.Cassel@....com>
Cc:     Jens Axboe <axboe@...nel.dk>,
        Damien Le Moal <Damien.LeMoal@....com>,
        "linux-block@...r.kernel.org" <linux-block@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/2] blk-zoned: allow BLKREPORTZONE without CAP_SYS_ADMIN

On Mon, May 31, 2021 at 01:54:53PM +0000, Niklas Cassel wrote:
> From: Niklas Cassel <niklas.cassel@....com>
> 
> Performing a BLKREPORTZONE operation should be allowed under the same
> permissions as read(). (read() does not require CAP_SYS_ADMIN).
> 
> Remove the CAP_SYS_ADMIN requirement, and instead check that the fd was
> successfully opened with FMODE_READ. This way BLKREPORTZONE will match
> the access control requirement of read().

Does this mean that a process that does not have read nor write access
to the device itself (blocks) is capable of reading the zone
information? Eg. some monitoring tool.