Description Alan Somers 2022-09-05 21:10:45 UTC

Creating an NFSv4 ACL with an entry that denies ACL_READ_ATTRIBUTES ought to deny the user the ability to stat the file.  On ZFS, it does.  But on UFS, it has no effect.

Steps to Reproduce:

#! /bin/sh
truncate -s 1g /tmp/ufs.img
MD=`mdconfig -a -t vnode -f /tmp/ufs.img`
newfs $MD
tunefs -N enable /dev/$MD
sudo mount /dev/$MD /mnt
cd /mnt
touch foo
setfacl -a 0 user:nobody:------a-------:-------:deny foo
sudo -u nobody stat $FILE >/dev/null 2>&1
if [ $? -eq 0 ]; then
	echo -e "ERROR: user nobody can stat the file, despite being denied by ACL"
fi

cd /
umount /mnt
mdconfig -d -u $MD