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

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Date:   Thu, 2 Dec 2021 00:44:15 -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 07:59:38AM +0000, Roberto Sassu wrote:
> ok, I will send it together with a patch for a not yet accepted
> software, Integrity Policy Enforcement (IPE), that will be
> the primary user of the introduced functionality.
> 
> Regarding the patch itself, could you please provide a more
> detailed explanation?

We don't build things into the kernel just as hooks.  So in doubt you
need to restructured the code.  And that a security module pokes into
a random block driver is a big hint that whatever you're trying to do is
completely broken.