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From: Roberto Sassu <roberto.sassu@huawei.com>
To: Greg KH <gregkh@linuxfoundation.org>
Cc: "zohar@linux.ibm.com" <zohar@linux.ibm.com>,
	"linux-integrity@vger.kernel.org"
	<linux-integrity@vger.kernel.org>,
	"linux-security-module@vger.kernel.org" 
	<linux-security-module@vger.kernel.org>,
	"linux-doc@vger.kernel.org" <linux-doc@vger.kernel.org>,
	"linux-kselftest@vger.kernel.org"
	<linux-kselftest@vger.kernel.org>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
Subject: RE: [RFC][PATCH 03/12] digest_lists: Basic definitions
Date: Mon, 28 Jun 2021 08:30:32 +0000	[thread overview]
Message-ID: <860717cce60f47abb3c9dc3c1bd32ab7@huawei.com> (raw)
In-Reply-To: <YNhYu3BXh7f9GkVk@kroah.com>

> From: Greg KH [mailto:gregkh@linuxfoundation.org]
> Sent: Sunday, June 27, 2021 12:54 PM
> On Fri, Jun 25, 2021 at 06:56:05PM +0200, Roberto Sassu wrote:
> > --- /dev/null
> > +++ b/include/uapi/linux/digest_lists.h
> > @@ -0,0 +1,43 @@
> > +/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
> > +/*
> > + * Copyright (C) 2017-2021 Huawei Technologies Duesseldorf GmbH
> > + *
> > + * Author: Roberto Sassu <roberto.sassu@huawei.com>
> > + *
> > + * This program is free software; you can redistribute it and/or
> > + * modify it under the terms of the GNU General Public License as
> > + * published by the Free Software Foundation, version 2 of the
> > + * License.
> 
> As you already have the SPDX line up there, you do not need this
> paragraph.  Please remove it from all of the new files you have added in
> this series.

Ok.

> > + *
> > + * File: digest_lists.h
> 
> We know the filename, no need to have it here again.
> 
> > + *      Digest list definitions exported to user space.
> 
> Now this is what probably needs more information...

Ok. Yes, these definitions are useful to generate digest lists
in user space.

> > + */
> > +
> > +#ifndef _UAPI__LINUX_DIGEST_LISTS_H
> > +#define _UAPI__LINUX_DIGEST_LISTS_H
> > +
> > +#include <linux/types.h>
> > +#include <linux/hash_info.h>
> > +
> > +enum compact_types { COMPACT_KEY, COMPACT_PARSER,
> COMPACT_FILE,
> > +		     COMPACT_METADATA, COMPACT_DIGEST_LIST,
> COMPACT__LAST };
> > +
> > +enum compact_modifiers { COMPACT_MOD_IMMUTABLE,
> COMPACT_MOD__LAST };
> > +
> > +enum compact_actions { COMPACT_ACTION_IMA_MEASURED,
> > +		       COMPACT_ACTION_IMA_APPRAISED,
> > +		       COMPACT_ACTION_IMA_APPRAISED_DIGSIG,
> > +		       COMPACT_ACTION__LAST };
> > +
> > +enum ops { DIGEST_LIST_ADD, DIGEST_LIST_DEL, DIGEST_LIST_OP__LAST };
> > +
> 
> For enums you export to userspace, you need to specify the values so
> that all compilers get them right.
> 
> > +struct compact_list_hdr {
> > +	__u8 version;
> 
> You should never need a version, that way lies madness.

We wanted to have a way to switch to a new format, if necessary.

> > +	__u8 _reserved;
> 
> You better be testing this for 0, right?

Ok, will do.

> > +	__le16 type;
> > +	__le16 modifiers;
> > +	__le16 algo;
> > +	__le32 count;
> > +	__le32 datalen;
> 
> Why are user/kernel apis specified in little endian format?  Why would
> that matter?  Shouldn't they just be "native" endian?

I thought this would make it clear that the kernel always expects the
digest lists to be in little endian.

Thanks

Roberto

HUAWEI TECHNOLOGIES Duesseldorf GmbH, HRB 56063
Managing Director: Li Peng, Li Jian, Shi Yanli

> thanks,
> 
> greg k-h

  parent reply	other threads:[~2021-06-28  8:30 UTC|newest]

Thread overview: 25+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-06-25 16:56 [RFC][PATCH 00/12] Huawei Digest Lists Roberto Sassu
2021-06-25 16:56 ` [RFC][PATCH 01/12] ima: Add digest, algo, measured parameters to ima_measure_critical_data() Roberto Sassu
2021-06-25 18:26   ` Mimi Zohar
2021-06-25 16:56 ` [RFC][PATCH 02/12] digest_lists: Overview Roberto Sassu
2021-06-25 16:56 ` [RFC][PATCH 03/12] digest_lists: Basic definitions Roberto Sassu
2021-06-27 10:53   ` Greg KH
2021-06-27 15:23     ` Matthew Wilcox
2021-06-27 15:35       ` Greg KH
2021-06-28  8:30     ` Roberto Sassu [this message]
2021-06-28  8:46       ` Greg KH
2021-06-28  9:27         ` Roberto Sassu
2021-06-28  9:32           ` Greg KH
2021-06-28  9:51             ` Roberto Sassu
2021-06-25 16:56 ` [RFC][PATCH 04/12] digest_lists: Objects Roberto Sassu
2021-06-27 10:56   ` Greg KH
2021-06-28  8:14     ` Roberto Sassu
2021-06-28  8:47       ` Greg KH
2021-06-25 16:56 ` [RFC][PATCH 05/12] digest_lists: Methods Roberto Sassu
2021-06-25 16:56 ` [RFC][PATCH 06/12] digest_lists: Parser Roberto Sassu
2021-06-25 16:56 ` [RFC][PATCH 07/12] digest_lists: Interfaces - digest_list_add, digest_list_del Roberto Sassu
2021-06-25 16:56 ` [RFC][PATCH 08/12] digest_lists: Interfaces - digest_lists_loaded Roberto Sassu
2021-06-25 16:56 ` [RFC][PATCH 09/12] digest_lists: Interfaces - digest_label Roberto Sassu
2021-06-25 16:56 ` [RFC][PATCH 10/12] digest_lists: Interfaces - digest_query Roberto Sassu
2021-06-25 16:56 ` [RFC][PATCH 11/12] digest_lists: Interfaces - digests_count Roberto Sassu
2021-06-25 16:56 ` [RFC][PATCH 12/12] digest_lists: Tests Roberto Sassu

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