selinux: avoid implicit conversions regarding enforcing status

Use the type bool as parameter type in
selinux_status_update_setenforce().  The related function
enforcing_enabled() returns the type bool, while the struct
selinux_kernel_status member enforcing uses an u32.
Signed-off-by: Christian Göttsche <cgzones@googlemail.com>
[PM: subject line tweaks]
Signed-off-by: Paul Moore <paul@paul-moore.com>

security/selinux/include/security.h

@@ -375,7 +375,7 @@ struct selinux_kernel_status {
 	 */
 } __packed;
 
-extern void selinux_status_update_setenforce(int enforcing);
+extern void selinux_status_update_setenforce(bool enforcing);
 extern void selinux_status_update_policyload(u32 seqno);
 extern void selinux_complete_init(void);
 extern struct path selinux_null;

security/selinux/selinuxfs.c

@@ -138,7 +138,8 @@ static ssize_t sel_write_enforce(struct file *file, const char __user *buf,
 {
 	char *page = NULL;
 	ssize_t length;
-	int old_value, new_value;
+	int scan_value;
+	bool old_value, new_value;
 
 	if (count >= PAGE_SIZE)
 		return -ENOMEM;
@@ -152,10 +153,10 @@ static ssize_t sel_write_enforce(struct file *file, const char __user *buf,
 		return PTR_ERR(page);
 
 	length = -EINVAL;
-	if (sscanf(page, "%d", &new_value) != 1)
+	if (sscanf(page, "%d", &scan_value) != 1)
 		goto out;
 
-	new_value = !!new_value;
+	new_value = !!scan_value;
 
 	old_value = enforcing_enabled();
 	if (new_value != old_value) {

security/selinux/status.c

@@ -76,7 +76,7 @@ struct page *selinux_kernel_status_page(void)
  *
  * It updates status of the current enforcing/permissive mode.
  */
-void selinux_status_update_setenforce(int enforcing)
+void selinux_status_update_setenforce(bool enforcing)
 {
 	struct selinux_kernel_status   *status;
 
@@ -87,7 +87,7 @@ void selinux_status_update_setenforce(int enforcing)
 		status->sequence++;
 		smp_wmb();
 
-		status->enforcing = enforcing;
+		status->enforcing = enforcing ? 1 : 0;
 
 		smp_wmb();
 		status->sequence++;