[LSM-IPSec]: Corrections to LSM-IPSec Nethooks

This patch contains two corrections to the LSM-IPsec Nethooks patches
previously applied.  

(1) free a security context on a failed insert via xfrm_user 
interface in xfrm_add_policy.  Memory leak.

(2) change the authorization of the allocation of a security context
in a xfrm_policy or xfrm_state from both relabelfrom and relabelto 
to setcontext.
Signed-off-by: NTrent Jaeger <tjaeger@cse.psu.edu>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

net/xfrm/xfrm_user.c

@@ -802,6 +802,7 @@ static int xfrm_add_policy(struct sk_buff *skb, struct nlmsghdr *nlh, void **xfr
 	excl = nlh->nlmsg_type == XFRM_MSG_NEWPOLICY;
 	err = xfrm_policy_insert(p->dir, xp, excl);
 	if (err) {
+		security_xfrm_policy_free(xp);
 		kfree(xp);
 		return err;
 	}

security/selinux/include/av_perm_to_string.h

@@ -238,5 +238,4 @@
    S_(SECCLASS_NSCD, NSCD__SHMEMHOST, "shmemhost")
    S_(SECCLASS_ASSOCIATION, ASSOCIATION__SENDTO, "sendto")
    S_(SECCLASS_ASSOCIATION, ASSOCIATION__RECVFROM, "recvfrom")
-   S_(SECCLASS_ASSOCIATION, ASSOCIATION__RELABELFROM, "relabelfrom")
-   S_(SECCLASS_ASSOCIATION, ASSOCIATION__RELABELTO, "relabelto")
+   S_(SECCLASS_ASSOCIATION, ASSOCIATION__SETCONTEXT, "setcontext")

security/selinux/include/av_permissions.h

@@ -908,8 +908,7 @@
 
 #define ASSOCIATION__SENDTO                       0x00000001UL
 #define ASSOCIATION__RECVFROM                     0x00000002UL
-#define ASSOCIATION__RELABELFROM                  0x00000004UL
-#define ASSOCIATION__RELABELTO                    0x00000008UL
+#define ASSOCIATION__SETCONTEXT                   0x00000004UL
 
 #define NETLINK_KOBJECT_UEVENT_SOCKET__IOCTL      0x00000001UL
 #define NETLINK_KOBJECT_UEVENT_SOCKET__READ       0x00000002UL

security/selinux/xfrm.c

@@ -137,15 +137,9 @@ static int selinux_xfrm_sec_ctx_alloc(struct xfrm_sec_ctx **ctxp, struct xfrm_us
 	 * Must be permitted to relabel from default socket type (process type)
 	 * to specified context
 	 */
-	rc = avc_has_perm(tsec->sid, tsec->sid,
-			  SECCLASS_ASSOCIATION,
-			  ASSOCIATION__RELABELFROM, NULL);
-	if (rc)
-		goto out;
-
 	rc = avc_has_perm(tsec->sid, ctx->ctx_sid,
 			  SECCLASS_ASSOCIATION,
-			  ASSOCIATION__RELABELTO, NULL);
+			  ASSOCIATION__SETCONTEXT, NULL);
 	if (rc)
 		goto out;