linux-kernel - [PATCH security-next v2 11/26] LSM: Introduce LSM_FLAG_LEGACY

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Message-Id: <20180920162338.21060-12-keescook@chromium.org>
Date:   Thu, 20 Sep 2018 09:23:23 -0700
From:   Kees Cook <keescook@...omium.org>
To:     James Morris <jmorris@...ei.org>
Cc:     Kees Cook <keescook@...omium.org>,
        Casey Schaufler <casey@...aufler-ca.com>,
        John Johansen <john.johansen@...onical.com>,
        Tetsuo Handa <penguin-kernel@...ove.sakura.ne.jp>,
        Paul Moore <paul@...l-moore.com>,
        Stephen Smalley <sds@...ho.nsa.gov>,
        "Schaufler, Casey" <casey.schaufler@...el.com>,
        LSM <linux-security-module@...r.kernel.org>,
        Jonathan Corbet <corbet@....net>, linux-doc@...r.kernel.org,
        linux-arch@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH security-next v2 11/26] LSM: Introduce LSM_FLAG_LEGACY_MAJOR

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@...omium.org>
---
 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 543636f18152..38cbefabff71 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	(1 << 0)
+
 struct lsm_info {
 	const char *name;	/* Populated automatically. */
+	unsigned long flags;	/* Optional: flags describing LSM */
 	int (*init)(void);
 };
 
diff --git a/security/apparmor/lsm.c b/security/apparmor/lsm.c
index 7fa7b4464cf4..4c5f63e9aeba 100644
--- a/security/apparmor/lsm.c
+++ b/security/apparmor/lsm.c
@@ -1607,5 +1607,6 @@ static int __init apparmor_init(void)
 }
 
 DEFINE_LSM(apparmor)
+	.flags = LSM_FLAG_LEGACY_MAJOR,
 	.init = apparmor_init,
 END_LSM;
diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c
index 469a90806bc6..615cf6498c0f 100644
--- a/security/selinux/hooks.c
+++ b/security/selinux/hooks.c
@@ -7203,6 +7203,7 @@ void selinux_complete_init(void)
 /* SELinux requires early initialization in order to label
    all processes and objects when they are created. */
 DEFINE_LSM(selinux)
+	.flags = LSM_FLAG_LEGACY_MAJOR,
 	.init = selinux_init,
 END_LSM;
 
diff --git a/security/smack/smack_lsm.c b/security/smack/smack_lsm.c
index 1e1ace718e75..4aef844fc0e2 100644
--- a/security/smack/smack_lsm.c
+++ b/security/smack/smack_lsm.c
@@ -4883,5 +4883,6 @@ static __init int smack_init(void)
  * all processes and objects when they are created.
  */
 DEFINE_LSM(smack)
+	.flags = LSM_FLAG_LEGACY_MAJOR,
 	.init = smack_init,
 END_LSM;
diff --git a/security/tomoyo/tomoyo.c b/security/tomoyo/tomoyo.c
index a280d4eab456..528b6244a648 100644
--- a/security/tomoyo/tomoyo.c
+++ b/security/tomoyo/tomoyo.c
@@ -551,5 +551,6 @@ static int __init tomoyo_init(void)
 }
 
 DEFINE_LSM(tomoyo)
+	.flags = LSM_FLAG_LEGACY_MAJOR,
 	.init = tomoyo_init,
 END_LSM;
-- 
2.17.1