Re: [PATCH v5 01/38] LSM: Introduce LSM_FLAG_LEGACY_MAJOR

From: Kees Cook <keescook@chromium.org>
To: Casey Schaufler <casey@schaufler-ca.com>
Cc: "James Morris" <jmorris@namei.org>,
	linux-security-module <linux-security-module@vger.kernel.org>,
	LKML <linux-kernel@vger.kernel.org>,
	"SE Linux" <selinux@tycho.nsa.gov>,
	"John Johansen" <john.johansen@canonical.com>,
	"Tetsuo Handa" <penguin-kernel@i-love.sakura.ne.jp>,
	"Paul Moore" <paul@paul-moore.com>,
	"linux-fsdevel@vger.kernel.org" <linux-fsdevel@vger.kernel.org>,
	"Stephen Smalley" <sds@tycho.nsa.gov>,
	"Alexey Dobriyan" <adobriyan@gmail.com>,
	"Mickaël Salaün" <mic@digikod.net>,
	"Salvatore Mesoraca" <s.mesoraca16@gmail.com>
Subject: Re: [PATCH v5 01/38] LSM: Introduce LSM_FLAG_LEGACY_MAJOR
Date: Mon, 26 Nov 2018 21:34:15 -0800	[thread overview]
Message-ID: <CAGXu5jJxjJoQmdsjy18z6N0fcSfpNTx60YnRESbOToHQG_2mdQ@mail.gmail.com> (raw)
In-Reply-To: <ecb10f5c-7bbd-fb2e-4148-63290bc9a7ff@schaufler-ca.com>

On Mon, Nov 26, 2018 at 3:26 PM Casey Schaufler <casey@schaufler-ca.com> wrote:

Hmmm... the "From: Kees..." in the body is missing. Are you using "git
send-email"?

>
> This adds a flag for the current "major" LSMs to distinguish them when
> we have a universal method for ordering all LSMs. It's called "legacy"
> since the distinction of "major" will go away in the blob-sharing world.
>
> Signed-off-by: Kees Cook <keescook@chromium.org>
> Reviewed-by: Casey Schaufler <casey@schaufler-ca.com>
> Reviewed-by: John Johansen <john.johansen@canonical.com>
> ---
>  include/linux/lsm_hooks.h  | 3 +++
>  security/apparmor/lsm.c    | 1 +
>  security/selinux/hooks.c   | 1 +
>  security/smack/smack_lsm.c | 1 +
>  security/tomoyo/tomoyo.c   | 1 +
>  5 files changed, 7 insertions(+)
>
> diff --git a/include/linux/lsm_hooks.h b/include/linux/lsm_hooks.h
> index aaeb7fa24dc4..63c0e102de20 100644
> --- a/include/linux/lsm_hooks.h
> +++ b/include/linux/lsm_hooks.h
> @@ -2039,8 +2039,11 @@ extern char *lsm_names;
>  extern void security_add_hooks(struct security_hook_list *hooks, int count,
>                                 char *lsm);
>
> +#define LSM_FLAG_LEGACY_MAJOR  BIT(0)
> +
>  struct lsm_info {
>         const char *name;       /* Required. */
> +       unsigned long flags;    /* Optional: flags describing LSM */
>         int (*init)(void);      /* Required. */
>  };
>
> diff --git a/security/apparmor/lsm.c b/security/apparmor/lsm.c
> index 42446a216f3b..2edd35ca5044 100644
> --- a/security/apparmor/lsm.c
> +++ b/security/apparmor/lsm.c
> @@ -1728,5 +1728,6 @@ static int __init apparmor_init(void)
>
>  DEFINE_LSM(apparmor) = {
>         .name = "apparmor",
> +       .flags = LSM_FLAG_LEGACY_MAJOR,
>         .init = apparmor_init,
>  };
> diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c
> index 7ce683259357..56c6f1849c80 100644
> --- a/security/selinux/hooks.c
> +++ b/security/selinux/hooks.c
> @@ -7209,6 +7209,7 @@ void selinux_complete_init(void)
>     all processes and objects when they are created. */
>  DEFINE_LSM(selinux) = {
>         .name = "selinux",
> +       .flags = LSM_FLAG_LEGACY_MAJOR,
>         .init = selinux_init,
>  };
>
> diff --git a/security/smack/smack_lsm.c b/security/smack/smack_lsm.c
> index 81fb4c1631e9..3639e55b1f4b 100644
> --- a/security/smack/smack_lsm.c
> +++ b/security/smack/smack_lsm.c
> @@ -4891,5 +4891,6 @@ static __init int smack_init(void)
>   */
>  DEFINE_LSM(smack) = {
>         .name = "smack",
> +       .flags = LSM_FLAG_LEGACY_MAJOR,
>         .init = smack_init,
>  };
> diff --git a/security/tomoyo/tomoyo.c b/security/tomoyo/tomoyo.c
> index 1b5b5097efd7..09f7af130d3a 100644
> --- a/security/tomoyo/tomoyo.c
> +++ b/security/tomoyo/tomoyo.c
> @@ -552,5 +552,6 @@ static int __init tomoyo_init(void)
>
>  DEFINE_LSM(tomoyo) = {
>         .name = "tomoyo",
> +       .flags = LSM_FLAG_LEGACY_MAJOR,
>         .init = tomoyo_init,
>  };
> --
> 2.14.5
>
>

-- 
Kees Cook