From: Casey Schaufler <casey@schaufler-ca.com>
To: Fan Wu <wufan@linux.microsoft.com>, Eric Biggers <ebiggers@kernel.org>
Cc: corbet@lwn.net, zohar@linux.ibm.com, jmorris@namei.org,
serge@hallyn.com, tytso@mit.edu, axboe@kernel.dk, agk@redhat.com,
snitzer@kernel.org, eparis@redhat.com, paul@paul-moore.com,
linux-doc@vger.kernel.org, linux-integrity@vger.kernel.org,
linux-security-module@vger.kernel.org,
linux-fscrypt@vger.kernel.org, linux-block@vger.kernel.org,
dm-devel@lists.linux.dev, audit@vger.kernel.org,
linux-kernel@vger.kernel.org,
Deven Bowers <deven.desai@linux.microsoft.com>,
Casey Schaufler <casey@schaufler-ca.com>
Subject: Re: [RFC PATCH v14 15/19] fsverity: consume builtin signature via LSM hook
Date: Tue, 12 Mar 2024 11:51:20 -0700 [thread overview]
Message-ID: <568fae5e-a6d4-4832-a1a1-ac3f4f93d650@schaufler-ca.com> (raw)
In-Reply-To: <51810153-eb6e-40f7-b5d0-5f72c2f4ee9b@linux.microsoft.com>
On 3/12/2024 11:14 AM, Fan Wu wrote:
>
>
> On 3/11/2024 8:07 PM, Eric Biggers wrote:
>> On Mon, Mar 11, 2024 at 07:57:12PM -0700, Eric Biggers wrote:
>>>
>>> As I've said before, this commit message needs some work. It
>>> currently doesn't
>>> say anything about what the patch actually does.
>>>
>>> BTW, please make sure you're Cc'ing the fsverity mailing list
>>> (fsverity@lists.linux.dev), not fscrypt
>>> (linux-fscrypt@vger.kernel.org).
>>
>> Also, I thought this patch was using a new LSM hook, but I now see
>> that you're
>> actually abusing the existing security_inode_setsecurity() LSM hook.
>> Currently
>> that hook is called when an xattr is set. I don't see any precedent for
>> overloading it for other purposes. This seems problematic, as it
>> means that a
>> request to set an xattr with the name you chose
>> ("fsverity.builtin-sig") will be
>> interpreted by LSMs as the fsverity builtin signature. A dedicated
>> LSM hook may
>> be necessary to avoid issues with overloading the existing xattr hook
>> like this.
>>
>> - Eric
>
> Thanks for the suggestion. I found that using
> security_inode_setsecurity() causes issues with SMACK's
> inode_setsecurity() hook. I will crate a dedicated new hook like
> security_inode_setsig() in the next version.
What is the issue you encountered with the Smack hook?
>
> -Fan
>
next prev parent reply other threads:[~2024-03-12 18:51 UTC|newest]
Thread overview: 36+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-03-06 23:34 [RFC PATCH v14 00/19] Integrity Policy Enforcement LSM (IPE) Fan Wu
2024-03-06 23:34 ` [RFC PATCH v14 01/19] security: add ipe lsm Fan Wu
2024-03-11 14:25 ` Roberto Sassu
2024-03-11 18:10 ` Fan Wu
2024-03-06 23:34 ` [RFC PATCH v14 02/19] ipe: add policy parser Fan Wu
2024-03-06 23:34 ` [RFC PATCH v14 03/19] ipe: add evaluation loop Fan Wu
2024-03-06 23:34 ` [RFC PATCH v14 04/19] ipe: add LSM hooks on execution and kernel read Fan Wu
2024-03-06 23:34 ` [RFC PATCH v14 05/19] initramfs|security: Add a security hook to do_populate_rootfs() Fan Wu
2024-03-11 14:53 ` Roberto Sassu
2024-03-11 18:34 ` Fan Wu
2024-03-06 23:34 ` [RFC PATCH v14 06/19] ipe: introduce 'boot_verified' as a trust provider Fan Wu
2024-03-06 23:34 ` [RFC PATCH v14 07/19] security: add new securityfs delete function Fan Wu
2024-03-06 23:34 ` [RFC PATCH v14 08/19] ipe: add userspace interface Fan Wu
2024-03-06 23:34 ` [RFC PATCH v14 09/19] uapi|audit|ipe: add ipe auditing support Fan Wu
2024-03-06 23:34 ` [RFC PATCH v14 10/19] ipe: add permissive toggle Fan Wu
2024-03-06 23:34 ` [RFC PATCH v14 11/19] block|security: add LSM blob to block_device Fan Wu
2024-03-06 23:34 ` [RFC PATCH v14 12/19] dm: add finalize hook to target_type Fan Wu
2024-03-06 23:34 ` [RFC PATCH v14 13/19] dm verity: consume root hash digest and signature data via LSM hook Fan Wu
2024-03-06 23:34 ` [RFC PATCH v14 14/19] ipe: add support for dm-verity as a trust provider Fan Wu
2024-03-07 0:01 ` Randy Dunlap
2024-03-06 23:34 ` [RFC PATCH v14 15/19] fsverity: consume builtin signature via LSM hook Fan Wu
2024-03-12 2:57 ` Eric Biggers
2024-03-12 3:07 ` Eric Biggers
2024-03-12 13:12 ` Paul Moore
2024-03-12 18:14 ` Fan Wu
2024-03-12 18:51 ` Casey Schaufler [this message]
2024-03-12 19:08 ` Fan Wu
2024-03-12 20:07 ` Paul Moore
2024-03-12 18:33 ` Fan Wu
2024-03-06 23:34 ` [RFC PATCH v14 16/19] ipe: enable support for fs-verity as a trust provider Fan Wu
2024-03-07 0:02 ` Randy Dunlap
2024-03-06 23:34 ` [RFC PATCH v14 17/19] scripts: add boot policy generation program Fan Wu
2024-03-07 0:05 ` Randy Dunlap
2024-03-06 23:34 ` [RFC PATCH v14 18/19] ipe: kunit test for parser Fan Wu
2024-03-06 23:34 ` [RFC PATCH v14 19/19] documentation: add ipe documentation Fan Wu
2024-03-09 1:14 ` [RFC PATCH v14 00/19] Integrity Policy Enforcement LSM (IPE) Paul Moore
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=568fae5e-a6d4-4832-a1a1-ac3f4f93d650@schaufler-ca.com \
--to=casey@schaufler-ca.com \
--cc=agk@redhat.com \
--cc=audit@vger.kernel.org \
--cc=axboe@kernel.dk \
--cc=corbet@lwn.net \
--cc=deven.desai@linux.microsoft.com \
--cc=dm-devel@lists.linux.dev \
--cc=ebiggers@kernel.org \
--cc=eparis@redhat.com \
--cc=jmorris@namei.org \
--cc=linux-block@vger.kernel.org \
--cc=linux-doc@vger.kernel.org \
--cc=linux-fscrypt@vger.kernel.org \
--cc=linux-integrity@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-security-module@vger.kernel.org \
--cc=paul@paul-moore.com \
--cc=serge@hallyn.com \
--cc=snitzer@kernel.org \
--cc=tytso@mit.edu \
--cc=wufan@linux.microsoft.com \
--cc=zohar@linux.ibm.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).