diff options
| author | Konstantin Belousov <kib@FreeBSD.org> | 2026-02-02 22:38:32 +0000 |
|---|---|---|
| committer | Konstantin Belousov <kib@FreeBSD.org> | 2026-02-03 10:25:47 +0000 |
| commit | cd8d44173adc375b59a24b1363476c086a7c86b4 (patch) | |
| tree | bcadd28b0e48d77f3623f560dd4d1abf00087afa | |
| parent | e1f36b9db9220cf51c6c3d2d2ad230fb9490bc3e (diff) | |
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
| -rw-r--r-- | sys/kern/vfs_mount.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/sys/kern/vfs_mount.c b/sys/kern/vfs_mount.c index 13403acacc08..240bf5451a84 100644 --- a/sys/kern/vfs_mount.c +++ b/sys/kern/vfs_mount.c @@ -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) |