net/unix: support SCM_SECURITY for stream sockets
authorStephen Smalley <sds@tycho.nsa.gov>
Wed, 10 Jun 2015 12:44:59 +0000 (08:44 -0400)
committerDavid S. Miller <davem@davemloft.net>
Thu, 11 Jun 2015 05:49:20 +0000 (22:49 -0700)
commit37a9a8df8ce9de6ea73349c9ac8bdf6ba4ec4f70
tree255b2d8c931e665feabf697cfd28f633f44232ea
parentbae23b6840a6a15947173d8282028458dbcdeb5b
net/unix: support SCM_SECURITY for stream sockets

SCM_SECURITY was originally only implemented for datagram sockets,
not for stream sockets.  However, SCM_CREDENTIALS is supported on
Unix stream sockets.  For consistency, implement Unix stream support
for SCM_SECURITY as well.  Also clean up the existing code and get
rid of the superfluous UNIXSID macro.

Motivated by https://bugzilla.redhat.com/show_bug.cgi?id=1224211,
where systemd was using SCM_CREDENTIALS and assumed wrongly that
SCM_SECURITY was also supported on Unix stream sockets.

Signed-off-by: Stephen Smalley <sds@tycho.nsa.gov>
Acked-by: Paul Moore <paul@paul-moore.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
include/net/af_unix.h
net/unix/af_unix.c