NetLabel: convert to an extensibile/sparse category bitmap

The original NetLabel category bitmap was a straight char bitmap which worked
fine for the initial release as it only supported 240 bits due to limitations
in the CIPSO restricted bitmap tag (tag type 0x01).  This patch converts that
straight char bitmap into an extensibile/sparse bitmap in order to lay the
foundation for other CIPSO tag types and protocols.

This patch also has a nice side effect in that all of the security attributes
passed by NetLabel into the LSM are now in a format which is in the host's
native byte/bit ordering which makes the LSM specific code much simpler; look
at the changes in security/selinux/ss/ebitmap.c as an example.

Signed-off-by: Paul Moore <paul.moore@hp.com>
Signed-off-by: James Morris <jmorris@namei.org>

1 files changed, 7 insertions, 16 deletions

diff --git a/security/selinux/ss/services.c b/security/selinux/ss/services.c
index b43dd803fd5e..bdb7070dd3dc 100644
--- a/security/selinux/ss/services.c
+++ b/security/selinux/ss/services.c
@@ -55,6 +55,7 @@
 #include "objsec.h"
 #include "selinux_netlabel.h"
 #include "xfrm.h"
+#include "ebitmap.h"
 
 extern void selnl_notify_policyload(u32 seqno);
 unsigned int policydb_loaded_version;
@@ -2384,13 +2385,10 @@ static int selinux_netlbl_secattr_to_sid(struct sk_buff *skb,
 		ctx_new.user = ctx->user;
 		ctx_new.role = ctx->role;
 		ctx_new.type = ctx->type;
-		mls_import_lvl(&ctx_new, secattr->mls_lvl, secattr->mls_lvl);
+		mls_import_netlbl_lvl(&ctx_new, secattr);
 		if (secattr->flags & NETLBL_SECATTR_MLS_CAT) {
-			if (mls_import_cat(&ctx_new,
-					   secattr->mls_cat,
-					   secattr->mls_cat_len,
-					   NULL,
-					   0) != 0)
+			if (ebitmap_netlbl_import(&ctx_new.range.level[0].cat,
+						  secattr->mls_cat) != 0)
 				goto netlbl_secattr_to_sid_return;
 			ctx_new.range.level[1].cat.highbit =
 				ctx_new.range.level[0].cat.highbit;
@@ -2486,19 +2484,12 @@ static int selinux_netlbl_socket_setsid(struct socket *sock, u32 sid)
 
 	secattr.domain = kstrdup(policydb.p_type_val_to_name[ctx->type - 1],
 				 GFP_ATOMIC);
-	mls_export_lvl(ctx, &secattr.mls_lvl, NULL);
-	rc = mls_export_cat(ctx,
-			    &secattr.mls_cat,
-			    &secattr.mls_cat_len,
-			    NULL,
-			    NULL);
+	secattr.flags |= NETLBL_SECATTR_DOMAIN;
+	mls_export_netlbl_lvl(ctx, &secattr);
+	rc = mls_export_netlbl_cat(ctx, &secattr);
 	if (rc != 0)
 		goto netlbl_socket_setsid_return;
 
-	secattr.flags |= NETLBL_SECATTR_DOMAIN | NETLBL_SECATTR_MLS_LVL;
-	if (secattr.mls_cat)
-		secattr.flags |= NETLBL_SECATTR_MLS_CAT;
-
 	rc = netlbl_socket_setattr(sock, &secattr);
 	if (rc == 0) {
 		spin_lock(&sksec->nlbl_lock);