apparmor: allow specifying an already created dir to create ns entries in

Signed-off-by: John Johansen <john.johansen@canonical.com>
Reviewed-by: Seth Arnold <seth.arnold@canonical.com>
Reviewed-by: Kees Cook <keescook@chromium.org>

security/apparmor/apparmorfs.c

@@ -1339,11 +1339,12 @@ static int __aafs_ns_mkdir_entries(struct aa_ns *ns, struct dentry *dir)
 /*
  * Requires: @ns->lock held
  */
-int __aafs_ns_mkdir(struct aa_ns *ns, struct dentry *parent, const char *name)
+int __aafs_ns_mkdir(struct aa_ns *ns, struct dentry *parent, const char *name,
+		    struct dentry *dent)
 {
 	struct aa_ns *sub;
 	struct aa_profile *child;
-	struct dentry *dent, *dir;
+	struct dentry *dir;
 	int error;
 
 	AA_BUG(!ns);
@@ -1373,7 +1374,7 @@ int __aafs_ns_mkdir(struct aa_ns *ns, struct dentry *parent, const char *name)
 	/* subnamespaces */
 	list_for_each_entry(sub, &ns->sub_ns, base.list) {
 		mutex_lock(&sub->lock);
-		error = __aafs_ns_mkdir(sub, ns_subns_dir(ns), NULL);
+		error = __aafs_ns_mkdir(sub, ns_subns_dir(ns), NULL, NULL);
 		mutex_unlock(&sub->lock);
 		if (error)
 			goto fail2;
@@ -1929,7 +1930,7 @@ static int __init aa_create_aafs(void)
 	ns_subremove(root_ns) = dent;
 
 	mutex_lock(&root_ns->lock);
-	error = __aafs_ns_mkdir(root_ns, aa_sfs_entry.dentry, "policy");
+	error = __aafs_ns_mkdir(root_ns, aa_sfs_entry.dentry, "policy", NULL);
 	mutex_unlock(&root_ns->lock);
 
 	if (error)

security/apparmor/include/apparmorfs.h

@@ -112,8 +112,8 @@ void __aafs_profile_migrate_dents(struct aa_profile *old,
 				   struct aa_profile *new);
 int __aafs_profile_mkdir(struct aa_profile *profile, struct dentry *parent);
 void __aafs_ns_rmdir(struct aa_ns *ns);
-int __aafs_ns_mkdir(struct aa_ns *ns, struct dentry *parent,
-		     const char *name);
+int __aafs_ns_mkdir(struct aa_ns *ns, struct dentry *parent, const char *name,
+		     struct dentry *dent);
 
 struct aa_loaddata;
 void __aa_fs_remove_rawdata(struct aa_loaddata *rawdata);

security/apparmor/policy_ns.c

@@ -196,7 +196,7 @@ static struct aa_ns *__aa_create_ns(struct aa_ns *parent, const char *name,
 	if (!ns)
 		return NULL;
 	mutex_lock(&ns->lock);
-	error = __aafs_ns_mkdir(ns, ns_subns_dir(parent), name);
+	error = __aafs_ns_mkdir(ns, ns_subns_dir(parent), name, dir);
 	if (error) {
 		AA_ERROR("Failed to create interface for ns %s\n",
 			 ns->base.name);