From 43fc460907dc56a3450654efc6ba1dfbcd4594eb Mon Sep 17 00:00:00 2001
From: Casey Schaufler <casey@schaufler-ca.com>
Date: Fri, 21 Sep 2018 17:18:07 -0700
Subject: TOMOYO: Abstract use of cred security blob

Don't use the cred->security pointer directly.
Provide helper functions that provide the security blob pointer.

Signed-off-by: Casey Schaufler <casey@schaufler-ca.com>
Reviewed-by: Kees Cook <keescook@chromium.org>
[kees: adjusted for ordered init series]
Signed-off-by: Kees Cook <keescook@chromium.org>
---
 security/tomoyo/common.h | 21 +++++++++++++++++++--
 1 file changed, 19 insertions(+), 2 deletions(-)

(limited to 'security/tomoyo/common.h')

diff --git a/security/tomoyo/common.h b/security/tomoyo/common.h
index 539bcdd30bb8..41898613d93b 100644
--- a/security/tomoyo/common.h
+++ b/security/tomoyo/common.h
@@ -29,6 +29,7 @@
 #include <linux/in.h>
 #include <linux/in6.h>
 #include <linux/un.h>
+#include <linux/lsm_hooks.h>
 #include <net/sock.h>
 #include <net/af_unix.h>
 #include <net/ip.h>
@@ -1062,6 +1063,7 @@ void tomoyo_write_log2(struct tomoyo_request_info *r, int len, const char *fmt,
 /********** External variable definitions. **********/
 
 extern bool tomoyo_policy_loaded;
+extern int tomoyo_enabled;
 extern const char * const tomoyo_condition_keyword
 [TOMOYO_MAX_CONDITION_KEYWORD];
 extern const char * const tomoyo_dif[TOMOYO_MAX_DOMAIN_INFO_FLAGS];
@@ -1196,6 +1198,17 @@ static inline void tomoyo_put_group(struct tomoyo_group *group)
 		atomic_dec(&group->head.users);
 }
 
+/**
+ * tomoyo_cred - Get a pointer to the tomoyo cred security blob
+ * @cred - the relevant cred
+ *
+ * Returns pointer to the tomoyo cred blob.
+ */
+static inline struct tomoyo_domain_info **tomoyo_cred(const struct cred *cred)
+{
+	return (struct tomoyo_domain_info **)&cred->security;
+}
+
 /**
  * tomoyo_domain - Get "struct tomoyo_domain_info" for current thread.
  *
@@ -1203,7 +1216,9 @@ static inline void tomoyo_put_group(struct tomoyo_group *group)
  */
 static inline struct tomoyo_domain_info *tomoyo_domain(void)
 {
-	return current_cred()->security;
+	struct tomoyo_domain_info **blob = tomoyo_cred(current_cred());
+
+	return *blob;
 }
 
 /**
@@ -1216,7 +1231,9 @@ static inline struct tomoyo_domain_info *tomoyo_domain(void)
 static inline struct tomoyo_domain_info *tomoyo_real_domain(struct task_struct
 							    *task)
 {
-	return task_cred_xxx(task, security);
+	struct tomoyo_domain_info **blob = tomoyo_cred(get_task_cred(task));
+
+	return *blob;
 }
 
 /**
-- 
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