linux-kernel - Re: [PATCH v1 3/8] LSM: Identify the process attributes for each module

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Message-ID: <CAHC9VhT34=sNYFcx24CNb5+An+jReQuMJTQAbeZUbbwKKQYLuA@mail.gmail.com>
Date:   Wed, 9 Nov 2022 21:39:16 -0500
From:   Paul Moore <paul@...l-moore.com>
To:     Casey Schaufler <casey@...aufler-ca.com>
Cc:     casey.schaufler@...el.com, linux-security-module@...r.kernel.org,
        jmorris@...ei.org, keescook@...omium.org,
        john.johansen@...onical.com, penguin-kernel@...ove.sakura.ne.jp,
        stephen.smalley.work@...il.com, linux-kernel@...r.kernel.org,
        linux-api@...r.kernel.org, mic@...ikod.net
Subject: Re: [PATCH v1 3/8] LSM: Identify the process attributes for each module

On Wed, Nov 9, 2022 at 8:03 PM Casey Schaufler <casey@...aufler-ca.com> wrote:
> On 11/9/2022 3:34 PM, Paul Moore wrote:
> > On Tue, Oct 25, 2022 at 2:47 PM Casey Schaufler <casey@...aufler-ca.com> wrote:
> >> Add an integer member "features" to the struct lsm_id which
> >> identifies the API related data associated with each security
> >> module. The initial set of features maps to information that
> >> has traditionaly been available in /proc/self/attr.
> >>
> >> Signed-off-by: Casey Schaufler <casey@...aufler-ca.com>
> >> ---
> >>  include/linux/lsm_hooks.h  |  1 +
> >>  include/uapi/linux/lsm.h   | 14 ++++++++++++++
> >>  security/apparmor/lsm.c    |  1 +
> >>  security/selinux/hooks.c   |  2 ++
> >>  security/smack/smack_lsm.c |  1 +
> >>  5 files changed, 19 insertions(+)
> > Everything Greg already said with one additional comment below.
> >
> >> diff --git a/include/linux/lsm_hooks.h b/include/linux/lsm_hooks.h
> >> index dd4b4d95a172..46b2aa6a677e 100644
> >> --- a/include/linux/lsm_hooks.h
> >> +++ b/include/linux/lsm_hooks.h
> >> @@ -1608,6 +1608,7 @@ struct security_hook_heads {
> >>  struct lsm_id {
> >>         const char      *lsm;           /* Name of the LSM */
> >>         int             id;             /* LSM ID */
> >> +       int             features;       /* Set of LSM features */
> > I understand why you called the field "features", but I worry it is a
> > bit too generic for 32-bits of flags. Let's make it specific to the
> > LSM label attributes; how about 'feat_attr', 'sup_attr', or something
> > along those lines?
>
> How about 'attrs_used'? I'm open to anything except 'late_for_dinner' :)

Works for me.  It's also worth noting that this struct isn't part of
the UAPI so if we need to change it in the future we can.

-- 
paul-moore.com