linux-kernel - Re: [PATCH v1] security: Add a new hook: inode_touch

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Date:   Thu, 22 Dec 2016 01:01:39 +0100
From:   Mickaël Salaün <mic@...ikod.net>
To:     Casey Schaufler <casey@...aufler-ca.com>,
        linux-kernel@...r.kernel.org
Cc:     Alexander Viro <viro@...iv.linux.org.uk>,
        Andreas Gruenbacher <agruenba@...hat.com>,
        Andy Lutomirski <luto@...capital.net>,
        Dmitry Kasatkin <dmitry.kasatkin@...il.com>,
        Eric Paris <eparis@...isplace.org>,
        James Morris <james.l.morris@...cle.com>,
        John Johansen <john.johansen@...onical.com>,
        Kees Cook <keescook@...omium.org>,
        Kentaro Takeda <takedakn@...data.co.jp>,
        Mimi Zohar <zohar@...ux.vnet.ibm.com>,
        Paul Moore <paul@...l-moore.com>,
        "Serge E . Hallyn" <serge@...lyn.com>,
        Stephen Smalley <sds@...ho.nsa.gov>,
        Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>,
        Vivek Goyal <vgoyal@...hat.com>, linux-fsdevel@...r.kernel.org,
        linux-security-module@...r.kernel.org
Subject: Re: [PATCH v1] security: Add a new hook: inode_touch_atime


On 22/12/2016 00:33, Casey Schaufler wrote:
> On 12/21/2016 3:15 PM, Mickaël Salaün wrote:
>> Add a new LSM hook named inode_touch_atime which is needed to deny
>> indirect update of extended file attributes (i.e. access time) which are
>> not catched by the inode_setattr hook. By creating a new hook instead of
>> calling inode_setattr, we avoid to simulate a useless struct iattr.
>>
>> This hook allows to create read-only environments as with read-only
>> mount points. It can also take care of anonymous inodes.
> 
> What security module would use this?

SELinux should be interested. This is useful to create sandboxes so
other LSM may be interested too

I'm working on a new LSM and I would like this kind of hook to create a
real read-only environment.

Regards,
 Mickaël



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