linux-kernel - Re: [RFC][PATCH] device mapper: Add builtin function dm_get

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Message-ID: <Yam+m9eiLxIamGXm@infradead.org>
Date:   Thu, 2 Dec 2021 22:52:11 -0800
From:   Christoph Hellwig <hch@...radead.org>
To:     Roberto Sassu <roberto.sassu@...wei.com>
Cc:     Christoph Hellwig <hch@...radead.org>,
        "deven.desai@...ux.microsoft.com" <deven.desai@...ux.microsoft.com>,
        "corbet@....net" <corbet@....net>,
        "axboe@...nel.dk" <axboe@...nel.dk>,
        "agk@...hat.com" <agk@...hat.com>,
        "snitzer@...hat.com" <snitzer@...hat.com>,
        "ebiggers@...nel.org" <ebiggers@...nel.org>,
        "tytso@....edu" <tytso@....edu>,
        "paul@...l-moore.com" <paul@...l-moore.com>,
        "eparis@...hat.com" <eparis@...hat.com>,
        "jmorris@...ei.org" <jmorris@...ei.org>,
        "serge@...lyn.com" <serge@...lyn.com>,
        "jannh@...gle.com" <jannh@...gle.com>,
        "dm-devel@...hat.com" <dm-devel@...hat.com>,
        "linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-block@...r.kernel.org" <linux-block@...r.kernel.org>,
        "linux-fscrypt@...r.kernel.org" <linux-fscrypt@...r.kernel.org>,
        "linux-audit@...hat.com" <linux-audit@...hat.com>,
        "linux-security-module@...r.kernel.org" 
        <linux-security-module@...r.kernel.org>,
        "linux-integrity@...r.kernel.org" <linux-integrity@...r.kernel.org>,
        "tusharsu@...ux.microsoft.com" <tusharsu@...ux.microsoft.com>
Subject: Re: [RFC][PATCH] device mapper: Add builtin function dm_get_status()

On Thu, Dec 02, 2021 at 09:29:52AM +0000, Roberto Sassu wrote:
> The problem being solved is how to grant access to files
> which satisfy a property defined in the policy.

If you have want to enforce access to files in the block layer using
a specific stacking block driver you don't just have one layering
violation but a bunch of them.  Please go back to the drawing board.