Correct several issues in the integration of POSIX shared memory objects

and the new setmode and setowner fileops in FreeBSD 9.0:

- Add new MAC Framework entry point mac_posixshm_check_create() to allow
  MAC policies to authorise shared memory use.  Provide a stub policy and
  test policy templates.

- Add missing Biba and MLS implementations of mac_posixshm_check_setmode()
  and mac_posixshm_check_setowner().

- Add 'accmode' argument to mac_posixshm_check_open() -- unlike the
  mac_posixsem_check_open() entry point it was modeled on, the access mode
  is required as shared memory access can be read-only as well as writable;
  this isn't true of POSIX semaphores.

- Implement full range of POSIX shared memory entry points for Biba and MLS.

Sponsored by:   Google Inc.
Obtained from:	TrustedBSD Project
Approved by:    re (kib)

1 files changed, 10 insertions, 2 deletions

diff --git a/sys/security/mac_stub/mac_stub.c b/sys/security/mac_stub/mac_stub.c
index 361bb15..f1d3e10 100644
--- a/sys/security/mac_stub/mac_stub.c
+++ b/sys/security/mac_stub/mac_stub.c
@@ -1,5 +1,5 @@
 /*-
- * Copyright (c) 1999-2002, 2007-2009 Robert N. M. Watson
+ * Copyright (c) 1999-2002, 2007-2011 Robert N. M. Watson
  * Copyright (c) 2001-2005 McAfee, Inc.
  * Copyright (c) 2005-2006 SPARTA, Inc.
  * Copyright (c) 2008 Apple Inc.
@@ -734,6 +734,13 @@ stub_posixsem_create(struct ucred *cred, struct ksem *ks,
 }
 
 static int
+stub_posixshm_check_create(struct ucred *cred, const char *path)
+{
+
+	return (0);
+}
+
+static int
 stub_posixshm_check_mmap(struct ucred *cred, struct shmfd *shmfd,
     struct label *shmlabel, int prot, int flags)
 {
@@ -743,7 +750,7 @@ stub_posixshm_check_mmap(struct ucred *cred, struct shmfd *shmfd,
 
 static int
 stub_posixshm_check_open(struct ucred *cred, struct shmfd *shmfd,
-    struct label *shmlabel)
+    struct label *shmlabel, accmode_t accmode)
 {
 
 	return (0);
@@ -1772,6 +1779,7 @@ static struct mac_policy_ops stub_ops =
 	.mpo_posixsem_destroy_label = stub_destroy_label,
 	.mpo_posixsem_init_label = stub_init_label,
 
+	.mpo_posixshm_check_create = stub_posixshm_check_create,
 	.mpo_posixshm_check_mmap = stub_posixshm_check_mmap,
 	.mpo_posixshm_check_open = stub_posixshm_check_open,
 	.mpo_posixshm_check_setmode = stub_posixshm_check_setmode,