linux-hardening - Re: [PATCH 3/9] ima: Move xattr hooks into LSM

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Date:   Wed, 19 Oct 2022 09:24:05 -0400
From:   Mimi Zohar <zohar@...ux.ibm.com>
To:     Christian Brauner <brauner@...nel.org>,
        Kees Cook <keescook@...omium.org>
Cc:     Dmitry Kasatkin <dmitry.kasatkin@...il.com>,
        Paul Moore <paul@...l-moore.com>,
        James Morris <jmorris@...ei.org>,
        "Serge E. Hallyn" <serge@...lyn.com>, Borislav Petkov <bp@...e.de>,
        Jonathan McDowell <noodles@...com>,
        Takashi Iwai <tiwai@...e.de>, Petr Vorel <pvorel@...e.cz>,
        linux-integrity@...r.kernel.org,
        linux-security-module@...r.kernel.org,
        Mickaël Salaün <mic@...ikod.net>,
        KP Singh <kpsingh@...nel.org>,
        Casey Schaufler <casey@...aufler-ca.com>,
        John Johansen <john.johansen@...onical.com>,
        linux-kernel@...r.kernel.org, linux-hardening@...r.kernel.org
Subject: Re: [PATCH 3/9] ima: Move xattr hooks into LSM

On Tue, 2022-10-18 at 17:07 +0200, Christian Brauner wrote:
> On Thu, Oct 13, 2022 at 03:36:48PM -0700, Kees Cook wrote:
> > Move the xattr IMA hooks into normal LSM layer. As with SELinux and
> > Smack, handle calling cap_inode_setxattr() internally.
> > 
> > Cc: Mimi Zohar <zohar@...ux.ibm.com>
> > Cc: Dmitry Kasatkin <dmitry.kasatkin@...il.com>
> > Cc: Paul Moore <paul@...l-moore.com>
> > Cc: James Morris <jmorris@...ei.org>
> > Cc: "Serge E. Hallyn" <serge@...lyn.com>
> > Cc: Borislav Petkov <bp@...e.de>
> > Cc: Jonathan McDowell <noodles@...com>
> > Cc: Takashi Iwai <tiwai@...e.de>
> > Cc: Petr Vorel <pvorel@...e.cz>
> > Cc: linux-integrity@...r.kernel.org
> > Cc: linux-security-module@...r.kernel.org
> > Signed-off-by: Kees Cook <keescook@...omium.org>
> > ---
> 
> I like that changes obviously but in general, does IMA depend on being
> called _after_ all other LSMs or is this just a historical artifact?

Calculating the EVM HMAC must be last, after the other security xattrs
have been updated.

-- 
thanks,

Mimi