apparmor: export that basic profile namespaces are supported

Allow userspace to detect that basic profile policy namespaces are
available.
Signed-off-by: John Johansen <john.johansen@canonical.com>

security/apparmor/apparmorfs.c

@@ -2151,6 +2151,12 @@ static struct aa_sfs_entry aa_sfs_entry_policy[] = {
 	{ }
 };
 
+static struct aa_sfs_entry aa_sfs_entry_ns[] = {
+	AA_SFS_FILE_BOOLEAN("profile",		1),
+	AA_SFS_FILE_BOOLEAN("pivot_root",	1),
+	{ }
+};
+
 static struct aa_sfs_entry aa_sfs_entry_query_label[] = {
 	AA_SFS_FILE_STRING("perms", "allow deny audit quiet"),
 	AA_SFS_FILE_BOOLEAN("data",		1),
@@ -2166,6 +2172,7 @@ static struct aa_sfs_entry aa_sfs_entry_features[] = {
 	AA_SFS_DIR("policy",			aa_sfs_entry_policy),
 	AA_SFS_DIR("domain",			aa_sfs_entry_domain),
 	AA_SFS_DIR("file",			aa_sfs_entry_file),
+	AA_SFS_DIR("namespaces",		aa_sfs_entry_ns),
 	AA_SFS_FILE_U64("capability",		VFS_CAP_FLAGS_MASK),
 	AA_SFS_DIR("rlimit",			aa_sfs_entry_rlimit),
 	AA_SFS_DIR("caps",			aa_sfs_entry_caps),