nfsd: Fix handling of hidden/system during Open/CreateHEADmain

When an NFSv4.n client specifies settings for the archive,
hidden and/or system attributes during a Open/Create, the
Open/Create fails for ZFS.  This is caused by ZFS doing
a secpolicy_xvattr() call, which fails for non-root.
If this check is bypassed, ZFS panics.

This patch resolves the problem by disabling va_flags
for the VOP_CREATE() call in the NFSv4.n server and
then setting the flags with a subsequent VOP_SETATTR().

This problem only affects FreeBSD-15 and main, since the
archive, system and hidden attributes are not enabled
for FreeBSD-14.

I think a similar problem exists for the NFSv4.n
Open/Create/Exclusive_41, but that will be resolved
in a future commit.

Note that the Linux, Solaris and FreeBSD clients
do not set archive, hidden or system for Open/Create,
so the bug does not affect mounts from those clients.

PR:	292283
Reported by:	Aurelien Couderc <aurelien.couderc2002@gmail.com>
Tested by:	Aurelien Couderc <aurelien.couderc2002@gmail.com>
MFC after:	2 weeks

0 files changed, 0 insertions, 0 deletions