selinux: add FILE__WATCH_MOUNTNS

Watching mount namespaces for changes (mount, umount, move mount) was added by previous patches. This patch adds the file/watch_mountns permission that can be applied to nsfs files (/proc/$$/ns/mnt), making it possible to allow or deny watching a particular namespace for changes. Suggested-by: Paul Moore <paul@paul-moore.com> Link: https://lore.kernel.org/all/CAHC9VhTOmCjCSE2H0zwPOmpFopheexVb6jyovz92ZtpKtoVv6A@mail.gmail.com/ Signed-off-by: Miklos Szeredi <mszeredi@redhat.com> Link: https://lore.kernel.org/r/20250224154836.958915-1-mszeredi@redhat.com Acked-by: Paul Moore <paul@paul-moore.com> Signed-off-by: Christian Brauner <brauner@kernel.org>
mariux64 · Feb 27, 2025 · 7d90fb5 · 7d90fb5
1 parent 33cec19
commit 7d90fb5
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diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c
@@ -3395,6 +3395,9 @@ static int selinux_path_notify(const struct path *path, u64 mask,
 	case FSNOTIFY_OBJ_TYPE_INODE:
 		perm = FILE__WATCH;
 		break;
+	case FSNOTIFY_OBJ_TYPE_MNTNS:
+		perm = FILE__WATCH_MOUNTNS;
+		break;
 	default:
 		return -EINVAL;
 	}

diff --git a/security/selinux/include/classmap.h b/security/selinux/include/classmap.h
@@ -8,7 +8,7 @@
 	COMMON_FILE_SOCK_PERMS, "unlink", "link", "rename", "execute",   \
 		"quotaon", "mounton", "audit_access", "open", "execmod", \
 		"watch", "watch_mount", "watch_sb", "watch_with_perm",   \
-		"watch_reads"
+		"watch_reads", "watch_mountns"
 
 #define COMMON_SOCK_PERMS                                              \
 	COMMON_FILE_SOCK_PERMS, "bind", "connect", "listen", "accept", \