netdev - Re: [PATCH v20 14/23] LSM: Ensure the correct LSM context releaser

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Message-ID: <CAHC9VhQmEgNgsXmk8MeMsfkvZ82GuHBguoBvG5WR9mcoztBDOA@mail.gmail.com>
Date:   Sat, 5 Sep 2020 22:45:57 -0400
From:   Paul Moore <paul@...l-moore.com>
To:     Casey Schaufler <casey@...aufler-ca.com>
Cc:     casey.schaufler@...el.com, James Morris <jmorris@...ei.org>,
        linux-security-module@...r.kernel.org, selinux@...r.kernel.org,
        linux-audit@...hat.com, keescook@...omium.org,
        john.johansen@...onical.com, penguin-kernel@...ove.sakura.ne.jp,
        Stephen Smalley <sds@...ho.nsa.gov>,
        linux-integrity@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: [PATCH v20 14/23] LSM: Ensure the correct LSM context releaser

On Wed, Aug 26, 2020 at 11:16 AM Casey Schaufler <casey@...aufler-ca.com> wrote:
>
> Add a new lsmcontext data structure to hold all the information
> about a "security context", including the string, its size and
> which LSM allocated the string. The allocation information is
> necessary because LSMs have different policies regarding the
> lifecycle of these strings. SELinux allocates and destroys
> them on each use, whereas Smack provides a pointer to an entry
> in a list that never goes away.
>
> Reviewed-by: Kees Cook <keescook@...omium.org>
> Reviewed-by: John Johansen <john.johansen@...onical.com>
> Acked-by: Stephen Smalley <sds@...ho.nsa.gov>
> Signed-off-by: Casey Schaufler <casey@...aufler-ca.com>
> Cc: linux-integrity@...r.kernel.org
> Cc: netdev@...r.kernel.org
> ---
>  drivers/android/binder.c                | 10 ++++---
>  fs/ceph/xattr.c                         |  6 ++++-
>  fs/nfs/nfs4proc.c                       |  8 ++++--
>  fs/nfsd/nfs4xdr.c                       |  7 +++--
>  include/linux/security.h                | 35 +++++++++++++++++++++++--
>  include/net/scm.h                       |  5 +++-
>  kernel/audit.c                          | 14 +++++++---
>  kernel/auditsc.c                        | 12 ++++++---
>  net/ipv4/ip_sockglue.c                  |  4 ++-
>  net/netfilter/nf_conntrack_netlink.c    |  4 ++-
>  net/netfilter/nf_conntrack_standalone.c |  4 ++-
>  net/netfilter/nfnetlink_queue.c         | 13 ++++++---
>  net/netlabel/netlabel_unlabeled.c       | 19 +++++++++++---
>  net/netlabel/netlabel_user.c            |  4 ++-
>  security/security.c                     | 11 ++++----
>  15 files changed, 121 insertions(+), 35 deletions(-)

One small comment below, but otherwise ...

Acked-by: Paul Moore <paul@...l-moore.com>

> +/**
> + * lsmcontext_init - initialize an lsmcontext structure.
> + * @cp: Pointer to the context to initialize
> + * @context: Initial context, or NULL
> + * @size: Size of context, or 0
> + * @slot: Which LSM provided the context
> + *
> + * Fill in the lsmcontext from the provided information.
> + * This is a scaffolding function that will be removed when
> + * lsmcontext integration is complete.
> + */
> +static inline void lsmcontext_init(struct lsmcontext *cp, char *context,
> +                                  u32 size, int slot)
> +{
> +       cp->slot = slot;
> +       cp->context = context;
> +       cp->len = size;
> +}

Here is another case where some of the intermediate code, and perhaps
some of the final code, can probably be simplified if
lsmcontext_init() returns the lsmcontext pointer.

-- 
paul moore
www.paul-moore.com