linux-kernel - Re: [PATCH 0/3] SG_IO command filtering via sysfs

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Date:   Mon, 12 Nov 2018 00:20:13 -0800
From:   Christoph Hellwig <hch@...radead.org>
To:     "Theodore Y. Ts'o" <tytso@....edu>,
        Christoph Hellwig <hch@...radead.org>,
        Paolo Bonzini <pbonzini@...hat.com>,
        linux-kernel@...r.kernel.org, linux-scsi@...r.kernel.org,
        Hannes Reinecke <hare@...e.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        James Bottomley <James.Bottomley@...senpartnership.com>
Subject: Re: [PATCH 0/3] SG_IO command filtering via sysfs

On Sun, Nov 11, 2018 at 08:42:42AM -0500, Theodore Y. Ts'o wrote:
> It really depends on the security model being used on a particular
> system.  I can easily imagine scenarios where userspace is allowed
> full access to the device with respect to read/write/open, but the
> security model doesn't want to allow access to various SCSI commands
> such as firmware upload commands, TCG commads, the
> soon-to-be-standardized Zone Activation Commands (which allow dynamic
> conversion of HDD recording modes between CMR and SMR), etc.

Well, that's what we have the security_file_ioctl() LSM hook for so that
your security model can arbitrate access to ioctls.