linux-kernel - [PATCH v5 17/38] Yama: Initialize as ordered LSM

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Date:   Mon, 26 Nov 2018 15:39:45 -0800
From:   Casey Schaufler <casey@...aufler-ca.com>
To:     James Morris <jmorris@...ei.org>,
        LSM <linux-security-module@...r.kernel.org>,
        LKLM <linux-kernel@...r.kernel.org>,
        SE Linux <selinux@...ho.nsa.gov>
Cc:     John Johansen <john.johansen@...onical.com>,
        Kees Cook <keescook@...omium.org>,
        Tetsuo Handa <penguin-kernel@...ove.sakura.ne.jp>,
        Paul Moore <paul@...l-moore.com>,
        "linux-fsdevel@...r.kernel.org" <linux-fsdevel@...r.kernel.org>,
        Stephen Smalley <sds@...ho.nsa.gov>,
        Alexey Dobriyan <adobriyan@...il.com>,
        Mickaël Salaün <mic@...ikod.net>,
        Salvatore Mesoraca <s.mesoraca16@...il.com>
Subject: [PATCH v5 17/38] 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>
Reviewed-by: Casey Schaufler <casey@...aufler-ca.com>
---
 include/linux/lsm_hooks.h | 5 -----
 security/Kconfig          | 2 +-
 security/security.c       | 1 -
 security/yama/yama_lsm.c  | 8 +++++++-
 4 files changed, 8 insertions(+), 8 deletions(-)

diff --git a/include/linux/lsm_hooks.h b/include/linux/lsm_hooks.h
index b565c0c10269..6cfbd7d78a89 100644
--- a/include/linux/lsm_hooks.h
+++ b/include/linux/lsm_hooks.h
@@ -2087,10 +2087,5 @@ 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 566d54215cbe..94a71e022b79 100644
--- a/security/Kconfig
+++ b/security/Kconfig
@@ -241,7 +241,7 @@ source security/integrity/Kconfig
 
 config LSM
 	string "Ordered list of enabled LSMs"
-	default "loadpin,integrity,selinux,smack,tomoyo,apparmor"
+	default "yama,loadpin,integrity,selinux,smack,tomoyo,apparmor"
 	help
 	  A comma-separated list of LSMs, in initialization order.
 	  Any LSMs left off this list will be ignored. This can be
diff --git a/security/security.c b/security/security.c
index 0c092d62cc47..0c3c66dbf51c 100644
--- a/security/security.c
+++ b/security/security.c
@@ -274,7 +274,6 @@ 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. */
 	ordered_lsm_init();
diff --git a/security/yama/yama_lsm.c b/security/yama/yama_lsm.c
index ffda91a4a1aa..eb1da1303d2e 100644
--- a/security/yama/yama_lsm.c
+++ b/security/yama/yama_lsm.c
@@ -477,9 +477,15 @@ 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) = {
+	.name = "yama",
+	.init = yama_init,
+};
-- 
2.14.5