linux-kernel - Re: [PATCH v4 2/6] IMA: conditionally allow empty rule data

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <7d9822da396a92645482e37a8c8590902323c5ef.camel@linux.ibm.com>
Date:   Thu, 22 Oct 2020 16:38:58 -0400
From:   Mimi Zohar <zohar@...ux.ibm.com>
To:     Tushar Sugandhi <tusharsu@...ux.microsoft.com>,
        stephen.smalley.work@...il.com, casey@...aufler-ca.com,
        agk@...hat.com, snitzer@...hat.com, gmazyland@...il.com
Cc:     tyhicks@...ux.microsoft.com, sashal@...nel.org, jmorris@...ei.org,
        nramas@...ux.microsoft.com, linux-integrity@...r.kernel.org,
        selinux@...r.kernel.org, linux-security-module@...r.kernel.org,
        linux-kernel@...r.kernel.org, dm-devel@...hat.com
Subject: Re: [PATCH v4 2/6] IMA: conditionally allow empty rule data

Hi Tushar,

On Wed, 2020-09-23 at 12:20 -0700, Tushar Sugandhi wrote:
> ima_match_rule_data() permits the func to pass empty func_data.
> For instance, for the following func, the func_data keyrings= is
> optional.
>     measure func=KEY_CHECK keyrings=.ima
> 
> But a new func in future may want to constrain the func_data to
> be non-empty.  ima_match_rule_data() should support this constraint
> and it shouldn't be hard-coded in ima_match_rule_data().
> 
> Update ima_match_rule_data() to conditionally allow empty func_data
> for the func that needs it.
> 
> Signed-off-by: Tushar Sugandhi <tusharsu@...ux.microsoft.com>

Policy rules may constrain what is measured, but that decision should
be left to the system owner or admin.

Mimi