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diff --git a/sys/fs/fdescfs/fdesc_vnops.c b/sys/fs/fdescfs/fdesc_vnops.c
--- a/sys/fs/fdescfs/fdesc_vnops.c
+++ b/sys/fs/fdescfs/fdesc_vnops.c
@@ -492,9 +492,15 @@
/*
* Allow setattr where there is an underlying vnode.
+ * For O_PATH descriptors, disallow truncate.
*/
- error = getvnode(td, fd,
- cap_rights_init_one(&rights, CAP_EXTATTR_SET), &fp);
+ if (vap->va_size != VNOVAL) {
+ error = getvnode(td, fd,
+ cap_rights_init_one(&rights, CAP_EXTATTR_SET), &fp);
+ } else {
+ error = getvnode_path(td, fd,
+ cap_rights_init_one(&rights, CAP_EXTATTR_SET), &fp);
+ }
if (error) {
/*
* getvnode() returns EINVAL if the file descriptor is not

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