linux-kernel - [PATCH security-next v4 27/32] LoadPin: Initialize as ordered LSM

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Date:   Mon,  1 Oct 2018 17:55:00 -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 v4 27/32] LoadPin: Initialize as ordered LSM

This converts LoadPin 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/loadpin/loadpin.c | 8 +++++++-
 security/security.c        | 1 -
 4 files changed, 8 insertions(+), 8 deletions(-)

diff --git a/include/linux/lsm_hooks.h b/include/linux/lsm_hooks.h
index b026ea93ff01..098ccf2caa0e 100644
--- a/include/linux/lsm_hooks.h
+++ b/include/linux/lsm_hooks.h
@@ -2091,10 +2091,5 @@ extern void __init yama_add_hooks(void);
 #else
 static inline void __init yama_add_hooks(void) { }
 #endif
-#ifdef CONFIG_SECURITY_LOADPIN
-void __init loadpin_add_hooks(void);
-#else
-static inline void loadpin_add_hooks(void) { };
-#endif
 
 #endif /* ! __LINUX_LSM_HOOKS_H */
diff --git a/security/Kconfig b/security/Kconfig
index c68520d97fd7..e59cb9296316 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 "integrity"
+	default "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/loadpin/loadpin.c b/security/loadpin/loadpin.c
index d8a68a6f6fef..dab42bfa1e4a 100644
--- a/security/loadpin/loadpin.c
+++ b/security/loadpin/loadpin.c
@@ -184,13 +184,19 @@ static struct security_hook_list loadpin_hooks[] __lsm_ro_after_init = {
 	LSM_HOOK_INIT(kernel_load_data, loadpin_load_data),
 };
 
-void __init loadpin_add_hooks(void)
+static int __init loadpin_init(void)
 {
 	pr_info("ready to pin (currently %senforcing)\n",
 		enforcing ? "" : "not ");
 	security_add_hooks(loadpin_hooks, ARRAY_SIZE(loadpin_hooks), "loadpin");
+	return 0;
 }
 
+DEFINE_LSM(loadpin) = {
+	.name = "loadpin",
+	.init = loadpin_init,
+};
+
 /* Should not be mutable after boot, so not listed in sysfs (perm == 0). */
 module_param(enforcing, int, 0);
 MODULE_PARM_DESC(enforcing, "Enforce module/firmware pinning");
diff --git a/security/security.c b/security/security.c
index 6fafad44b85e..6957f5f50483 100644
--- a/security/security.c
+++ b/security/security.c
@@ -297,7 +297,6 @@ int __init security_init(void)
 	 */
 	capability_add_hooks();
 	yama_add_hooks();
-	loadpin_add_hooks();
 
 	/* Load LSMs in specified order. */
 	prepare_lsm_order();
-- 
2.17.1