linux-kernel - [PATCH security-next v3 25/29] Yama: Initialize as ordered LSM

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Date:   Mon, 24 Sep 2018 17:18:28 -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 v3 25/29] Yama: Initialize as ordered LSM

This converts Yama from being a direct "minor" LSM into an ordered LSM.

Signed-off-by: Kees Cook <keescook@...omium.org>
---
 include/linux/lsm_hooks.h | 5 -----
 security/Kconfig          | 2 +-
 security/security.c       | 1 -
 security/yama/yama_lsm.c  | 7 ++++++-
 4 files changed, 7 insertions(+), 8 deletions(-)

diff --git a/include/linux/lsm_hooks.h b/include/linux/lsm_hooks.h
index 9df08955f684..5be95c6155b4 100644
--- a/include/linux/lsm_hooks.h
+++ b/include/linux/lsm_hooks.h
@@ -2092,10 +2092,5 @@ static inline void security_delete_hooks(struct security_hook_list *hooks,
 #endif /* CONFIG_SECURITY_WRITABLE_HOOKS */
 
 extern void __init capability_add_hooks(void);
-#ifdef CONFIG_SECURITY_YAMA
-extern void __init yama_add_hooks(void);
-#else
-static inline void __init yama_add_hooks(void) { }
-#endif
 
 #endif /* ! __LINUX_LSM_HOOKS_H */
diff --git a/security/Kconfig b/security/Kconfig
index e20c2a3143e7..e37de9a44747 100644
--- a/security/Kconfig
+++ b/security/Kconfig
@@ -293,7 +293,7 @@ config LSM_ENABLE
 
 config LSM_ORDER
 	string "Default initialization order of builtin LSMs"
-	default "loadpin,integrity"
+	default "yama,loadpin,integrity"
 	help
 	  A comma-separated list of LSMs, in initialization order.
 	  Any LSMs left off this list will be link-order initialized
diff --git a/security/security.c b/security/security.c
index cb25f321e044..c4ba5832ef2f 100644
--- a/security/security.c
+++ b/security/security.c
@@ -304,7 +304,6 @@ int __init security_init(void)
 	 * Load minor LSMs, with the capability module always first.
 	 */
 	capability_add_hooks();
-	yama_add_hooks();
 
 	/* Load LSMs in specified order. */
 	prepare_lsm_order();
diff --git a/security/yama/yama_lsm.c b/security/yama/yama_lsm.c
index ffda91a4a1aa..f2b1f47f98e8 100644
--- a/security/yama/yama_lsm.c
+++ b/security/yama/yama_lsm.c
@@ -477,9 +477,14 @@ static void __init yama_init_sysctl(void)
 static inline void yama_init_sysctl(void) { }
 #endif /* CONFIG_SYSCTL */
 
-void __init yama_add_hooks(void)
+static int __init yama_init(void)
 {
 	pr_info("Yama: becoming mindful.\n");
 	security_add_hooks(yama_hooks, ARRAY_SIZE(yama_hooks), "yama");
 	yama_init_sysctl();
+	return 0;
 }
+
+DEFINE_LSM(yama)
+	.init = yama_init,
+END_LSM;
-- 
2.17.1