linux-kernel - Re: [PATCH v19 13/20] ipe: add support for dm-verity as a trust provider

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Date: Thu, 30 May 2024 08:49:43 +0300
From: "Jarkko Sakkinen" <jarkko@...nel.org>
To: "Paul Moore" <paul@...l-moore.com>, "Fan Wu"
 <wufan@...ux.microsoft.com>, <corbet@....net>, <zohar@...ux.ibm.com>,
 <jmorris@...ei.org>, <serge@...lyn.com>, <tytso@....edu>,
 <ebiggers@...nel.org>, <axboe@...nel.dk>, <agk@...hat.com>,
 <snitzer@...nel.org>, <mpatocka@...hat.com>, <eparis@...hat.com>
Cc: <linux-doc@...r.kernel.org>, <linux-integrity@...r.kernel.org>,
 <linux-security-module@...r.kernel.org>, <fsverity@...ts.linux.dev>,
 <linux-block@...r.kernel.org>, <dm-devel@...ts.linux.dev>,
 <audit@...r.kernel.org>, <linux-kernel@...r.kernel.org>, "Deven Bowers"
 <deven.desai@...ux.microsoft.com>
Subject: Re: [PATCH v19 13/20] ipe: add support for dm-verity as a trust
 provider

On Thu May 30, 2024 at 4:44 AM EEST, Paul Moore wrote:
> On May 24, 2024 Fan Wu <wufan@...ux.microsoft.com> wrote:
> > +	if (type == LSM_INT_DMVERITY_ROOTHASH) {
> > +		if (!value) {
> > +			ipe_digest_free(blob->root_hash);
> > +			blob->root_hash = NULL;
> > +
> > +			return 0;
> > +		}
> > +		digest = value;
> > +
> > +		info = kzalloc(sizeof(*info), GFP_KERNEL);
> > +		if (!info)
> > +			return -ENOMEM;
> > +
> > +		info->digest = kmemdup(digest->digest, digest->digest_len,
> > +				       GFP_KERNEL);
> > +		if (!info->digest)
> > +			goto dmv_roothash_err;
> > +
> > +		info->alg = kstrdup(digest->alg, GFP_KERNEL);
> > +		if (!info->alg)
> > +			goto dmv_roothash_err;
> > +
> > +		info->digest_len = digest->digest_len;
> > +
> > +		if (blob->root_hash)
> > +			ipe_digest_free(blob->root_hash);

I'd restructure this as:

	if (type == LSM_INT_DMVERITY_SIG_VALID {
		/* ... */
		return 0;
	}

	if (type != LSM_INT_DMVERITY_ROOTHASH)
		return -EINVAL;

	* ... */

Right? Less packed to the right ;-)

BR, Jarkko