SUID/SGID bits removed by setfacl --restore

 Hi all,

we use ACLs on a number of servers where files with extended ACLs are spreaded
all over the system. Since our current backup solution does not cover ACLs we
backup them via getfacl -R and restore them via setfacl --restore.

This works great, except that setfacl --restore seams to reset all
SUID/SGID-bits when restoring ACLs. Is this a desired behaviour??

In my opinion SUID/SGID-bits should either by saved and restored as well or
completely left alone. The current situation requires to backup/restore data,
backup/restore acls and then backup/restore SUID/SGID-bits.

Testcase:

$ touch testfile

$ chmod u+xs testfile

$ ls -la testfile
-rwsr--r-- 1 xx xx 0 Nov 20 14:28 testfile

$ getfacl testfile
# file: testfile
# owner: xx
# group: xx
user::rwx
group::r--
other::r--

$ getfacl testfile > acl_dump

$ setfacl --restore acl_dump

$ ls -la testfile
-rwxr--r--  1 xx xx    0 Nov 20 14:28 testfile

best wishes,
Michael



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