unmount(2): do not allow MNT_DEFERRED or MNT_RECURSE flags from userspace

Repprted and tested by:	pho
Sponsored by:	The FreeBSD Foundation
MFC after:	1 week

This commit is contained in:

Konstantin Belousov

2026-02-03 00:38:32 +02:00

parent e1f36b9db9

commit cd8d44173a

1 changed files with 2 additions and 0 deletions

									
										sys/kern/vfs_mount.c
									
		+2
		
												View File
												
				@@ -1733,6 +1733,8 @@ kern_unmount(struct thread *td, const char *path, int flags)

					int error;

					AUDIT_ARG_VALUE(flags);

					if ((flags & (MNT_DEFERRED | MNT_RECURSE)) != 0)

						return (EINVAL);

					if (jailed(td->td_ucred) || usermount == 0) {

						error = priv_check(td, PRIV_VFS_UNMOUNT);

						if (error)