[refpolicy] Fwd: [rhel5-cc-external-list] SELinux: refpolicy-2.20091117

Daniel J Walsh dwalsh at redhat.com
Tue Dec 14 09:42:30 CST 2010


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I got asked this question, by someone.  I am asking on both lists in
case the mls guys don't pay attention to the refpolicy list.
> 
> 
> Looking into the mls file, I find two rules for the accept syscall and the 
> same objects where one rule is read-like and the other is write like:
> 
> mlsconstrain { socket tcp_socket udp_socket rawip_socket netlink_socket 
> packet_socket key_socket unix_stream_socket unix_dgram_socket 
> netlink_route_socket netlink_firewall_socket netlink_tcpdiag_socket 
> netlink_nflog_socket netlink_xfrm_socket netlink_selinux_socket 
> netlink_audit_socket netlink_ip6fw_socket netlink_dnrt_socket } { accept 
> connect }
>         (( l1 eq l2 ) or
>          (((( t1 == mlsnetreadtoclr ) and ( h1 dom l2 )) or
>            ( t1 == mlsnetread )) and
>           ((( t1 == mlsnetwriteranged ) and ( l1 dom l2 ) and ( l1 domby h2 )) 
> or
>            (( t1 == mlsnetwritetoclr ) and ( h1 dom l2 ) and ( l1 domby l2 )) 
> or
>            ( t1 == mlsnetwrite ))));
> 
> 
> # the socket "read" ops (note the check is dominance of the low level)
> mlsconstrain { socket tcp_socket udp_socket rawip_socket netlink_socket 
> packet_socket key_socket unix_stream_socket unix_dgram_socket 
> netlink_route_socket netlink_firewall_socket netlink_tcpdiag_socket 
> netlink_nflog_socket netlink_xfrm_socket netlink_selinux_socket 
> netlink_audit_socket netlink_ip6fw_socket netlink_dnrt_socket } { read getattr 
> listen accept getopt recv_msg }
>         (( l1 dom l2 ) or
>          (( t1 == mlsnetreadtoclr ) and ( h1 dom l2 )) or
>          ( t1 == mlsnetread ));

Isn't the second accept covered by the first?
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