setfacl removes part of ACL when setting POSIX ACLs to Samba

commit b1d93356427be6f050dc55c86eb019d173700af6 upstream.

setfacl over cifs mounts can remove the default ACL when setting the
(non-default part of) the ACL and vice versa (we were leaving at 0
rather than setting to -1 the count field for the unaffected
half of the ACL.  For example notice the setfacl removed
the default ACL in this sequence:

steven@steven-GA-970A-DS3:~/cifs-2.6$ getfacl /mnt/test-dir ; setfacl
-m default:user:test:rwx,user:test:rwx /mnt/test-dir
getfacl: Removing leading '/' from absolute path names
user::rwx
group::r-x
other::r-x
default:user::rwx
default:user:test:rwx
default:group::r-x
default:mask::rwx
default:other::r-x

steven@steven-GA-970A-DS3:~/cifs-2.6$ getfacl /mnt/test-dir
getfacl: Removing leading '/' from absolute path names
user::rwx
user:test:rwx
group::r-x
mask::rwx
other::r-x

Signed-off-by: Steve French <smfrench@gmail.com>
Acked-by: Jeremy Allison <jra@samba.org>
[bwh: Backported to 3.2: adjust context]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
Cc: Rui Xiang <rui.xiang@huawei.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/fs/cifs/cifssmb.c b/fs/cifs/cifssmb.c
index 3a75ee5..6e60981 100644 (file)
--- a/fs/cifs/cifssmb.c
+++ b/fs/cifs/cifssmb.c
@@ -3454,11 +3454,13 @@ static __u16 ACL_to_cifs_posix(char *parm_data, const char *pACL,
                return 0;
        }
        cifs_acl->version = cpu_to_le16(1);
-       if (acl_type == ACL_TYPE_ACCESS)
+       if (acl_type == ACL_TYPE_ACCESS) {
                cifs_acl->access_entry_count = cpu_to_le16(count);
-       else if (acl_type == ACL_TYPE_DEFAULT)
+               cifs_acl->default_entry_count = __constant_cpu_to_le16(0xFFFF);
+       } else if (acl_type == ACL_TYPE_DEFAULT) {
                cifs_acl->default_entry_count = cpu_to_le16(count);
-       else {
+               cifs_acl->access_entry_count = __constant_cpu_to_le16(0xFFFF);
+       } else {
                cFYI(1, "unknown ACL type %d", acl_type);
                return 0;
        }