linux-hardening - Re: [PATCH 6/9] fs: Introduce file_to

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Date:   Thu, 20 Oct 2022 16:04:22 -0700
From:   Kees Cook <keescook@...omium.org>
To:     Casey Schaufler <casey@...aufler-ca.com>
Cc:     Mimi Zohar <zohar@...ux.ibm.com>,
        John Johansen <john.johansen@...onical.com>,
        Paul Moore <paul@...l-moore.com>,
        James Morris <jmorris@...ei.org>,
        "Serge E. Hallyn" <serge@...lyn.com>,
        linux-security-module@...r.kernel.org,
        Mickaël Salaün <mic@...ikod.net>,
        KP Singh <kpsingh@...nel.org>, linux-kernel@...r.kernel.org,
        linux-integrity@...r.kernel.org, linux-hardening@...r.kernel.org
Subject: Re: [PATCH 6/9] fs: Introduce file_to_perms() helper

On Thu, Oct 20, 2022 at 10:29:08AM -0700, Casey Schaufler wrote:
> On 10/13/2022 3:36 PM, Kees Cook wrote:
> > Extract the logic used by LSM file hooks to be able to reconstruct the
> > access mode permissions from an open.
> >
> > Cc: John Johansen <john.johansen@...onical.com>
> > Cc: Paul Moore <paul@...l-moore.com>
> > Cc: James Morris <jmorris@...ei.org>
> > Cc: "Serge E. Hallyn" <serge@...lyn.com>
> > Cc: linux-security-module@...r.kernel.org
> > Signed-off-by: Kees Cook <keescook@...omium.org>
> > ---
> >  include/linux/fs.h               | 22 ++++++++++++++++++++++
> >  security/apparmor/include/file.h | 18 ++++--------------
> >  2 files changed, 26 insertions(+), 14 deletions(-)
> 
> Smack uses its own definitions for MAY_SOMETHING. Making
> AppArmor's values global is going to clash. If you want to
> do this there needs to be a grand consolidation. It could
> go in security/lsm_hooks.h. I can't see anyone other than
> Smack wanting MAY_LOCK, so I can't say the concept really
> makes much sense.

I left AppArmor's special ones in apparmor/. This only lifts the common
pre-existing global VFS MAY_* flags. (And only the low nibble's worth).

-- 
Kees Cook