don't allow mounting with noval owner. panics later.

reported by Tim Newsham at NCC.
ok millert natano

diff --git a/sys/tmpfs/tmpfs_vfsops.c b/sys/tmpfs/tmpfs_vfsops.c
index b0f0e53..ff49be0 100644 (file)
--- a/sys/tmpfs/tmpfs_vfsops.c
+++ b/sys/tmpfs/tmpfs_vfsops.c
@@ -1,4 +1,4 @@
-/*     $OpenBSD: tmpfs_vfsops.c,v 1.8 2016/01/13 13:01:40 gsoares Exp $        */
+/*     $OpenBSD: tmpfs_vfsops.c,v 1.9 2016/07/11 22:36:25 tedu Exp $   */
 /*     $NetBSD: tmpfs_vfsops.c,v 1.52 2011/09/27 01:10:43 christos Exp $       */
 
 /*
@@ -125,6 +125,9 @@ tmpfs_mount(struct mount *mp, const char *path, void *data,
        error = copyin(data, &args, sizeof(struct tmpfs_args));
        if (error)
                return error;
+       if (args.ta_root_uid == VNOVAL || args.ta_root_gid == VNOVAL ||
+           args.ta_root_mode == VNOVAL)
+               return EINVAL;
 
        /* Get the memory usage limit for this file-system. */
        if (args.ta_size_max < PAGE_SIZE) {