WSL2-Linux-Kernel/security/selinux/include
Paul Moore 5dbbaf2de8 tun: fix LSM/SELinux labeling of tun/tap devices
This patch corrects some problems with LSM/SELinux that were introduced
with the multiqueue patchset.  The problem stems from the fact that the
multiqueue work changed the relationship between the tun device and its
associated socket; before the socket persisted for the life of the
device, however after the multiqueue changes the socket only persisted
for the life of the userspace connection (fd open).  For non-persistent
devices this is not an issue, but for persistent devices this can cause
the tun device to lose its SELinux label.

We correct this problem by adding an opaque LSM security blob to the
tun device struct which allows us to have the LSM security state, e.g.
SELinux labeling information, persist for the lifetime of the tun
device.  In the process we tweak the LSM hooks to work with this new
approach to TUN device/socket labeling and introduce a new LSM hook,
security_tun_dev_attach_queue(), to approve requests to attach to a
TUN queue via TUNSETQUEUE.

The SELinux code has been adjusted to match the new LSM hooks, the
other LSMs do not make use of the LSM TUN controls.  This patch makes
use of the recently added "tun_socket:attach_queue" permission to
restrict access to the TUNSETQUEUE operation.  On older SELinux
policies which do not define the "tun_socket:attach_queue" permission
the access control decision for TUNSETQUEUE will be handled according
to the SELinux policy's unknown permission setting.

Signed-off-by: Paul Moore <pmoore@redhat.com>
Acked-by: Eric Paris <eparis@parisplace.org>
Tested-by: Jason Wang <jasowang@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2013-01-14 18:16:59 -05:00
..
audit.h SELinux: keep the code clean formating and syntax 2008-07-14 15:01:36 +10:00
avc.h SELinux: avc: remove the useless fields in avc_add_callback 2012-04-09 12:23:44 -04:00
avc_ss.h selinux: sparse fix: fix several warnings in the security server code 2011-09-09 16:56:32 -07:00
classmap.h selinux: add the "attach_queue" permission to the "tun_socket" class 2013-01-14 18:16:59 -05:00
conditional.h Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
initial_sid_to_string.h selinux: const strings in tables 2010-03-08 09:33:53 +11:00
netif.h doc: Update the email address for Paul Moore in various source files 2011-08-01 17:58:33 -07:00
netlabel.h doc: Update the email address for Paul Moore in various source files 2011-08-01 17:58:33 -07:00
netnode.h doc: Update the email address for Paul Moore in various source files 2011-08-01 17:58:33 -07:00
netport.h doc: Update the email address for Paul Moore in various source files 2011-08-01 17:58:33 -07:00
objsec.h tun: fix LSM/SELinux labeling of tun/tap devices 2013-01-14 18:16:59 -05:00
security.h switch dentry_open() to struct path, make it grab references itself 2012-07-23 00:01:29 +04:00
xfrm.h xfrm: invalidate dst on policy insertion/deletion 2012-09-18 15:57:03 -04:00