[PATCH] selinux: add support for range transitions on object classes

Introduces support for policy version 21.  This version of the binary
kernel policy allows for defining range transitions on security classes
other than the process security class.  As always, backwards compatibility
for older formats is retained.  The security class is read in as specified
when using the new format, while the "process" security class is assumed
when using an older policy format.

Signed-off-by: Darrel Goeddel <dgoeddel@trustedcs.com>
Signed-off-by: Stephen Smalley <sds@tycho.nsa.gov>
Acked-by: James Morris <jmorris@namei.org>
Acked-by: Eric Paris <eparis@redhat.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 20 insertions, 7 deletions

diff --git a/security/selinux/ss/policydb.c b/security/selinux/ss/policydb.c
index f03960e697ce..b18895302555 100644
--- a/security/selinux/ss/policydb.c
+++ b/security/selinux/ss/policydb.c
@@ -96,6 +96,11 @@ static struct policydb_compat_info policydb_compat[] = {
                 .sym_num        = SYM_NUM,
                 .ocon_num       = OCON_NUM,
         },
+        {
+                .version        = POLICYDB_VERSION_RANGETRANS,
+                .sym_num        = SYM_NUM,
+                .ocon_num       = OCON_NUM,
+        },
 };
 
 static struct policydb_compat_info *policydb_lookup_compat(int version)
@@ -645,15 +650,15 @@ void policydb_destroy(struct policydb *p)
 
         for (rt = p->range_tr; rt; rt = rt -> next) {
                 if (lrt) {
-                        ebitmap_destroy(&lrt->range.level[0].cat);
-                        ebitmap_destroy(&lrt->range.level[1].cat);
+                        ebitmap_destroy(&lrt->target_range.level[0].cat);
+                        ebitmap_destroy(&lrt->target_range.level[1].cat);
                         kfree(lrt);
                 }
                 lrt = rt;
         }
         if (lrt) {
-                ebitmap_destroy(&lrt->range.level[0].cat);
-                ebitmap_destroy(&lrt->range.level[1].cat);
+                ebitmap_destroy(&lrt->target_range.level[0].cat);
+                ebitmap_destroy(&lrt->target_range.level[1].cat);
                 kfree(lrt);
         }
 
@@ -1829,6 +1834,7 @@ int policydb_read(struct policydb *p, void *fp)
         }
 
         if (p->policyvers >= POLICYDB_VERSION_MLS) {
+                int new_rangetr = p->policyvers >= POLICYDB_VERSION_RANGETRANS;
                 rc = next_entry(buf, fp, sizeof(u32));
                 if (rc < 0)
                         goto bad;
@@ -1847,9 +1853,16 @@ int policydb_read(struct policydb *p, void *fp)
                         rc = next_entry(buf, fp, (sizeof(u32) * 2));
                         if (rc < 0)
                                 goto bad;
-                        rt->dom = le32_to_cpu(buf[0]);
-                        rt->type = le32_to_cpu(buf[1]);
-                        rc = mls_read_range_helper(&rt->range, fp);
+                        rt->source_type = le32_to_cpu(buf[0]);
+                        rt->target_type = le32_to_cpu(buf[1]);
+                        if (new_rangetr) {
+                                rc = next_entry(buf, fp, sizeof(u32));
+                                if (rc < 0)
+                                        goto bad;
+                                rt->target_class = le32_to_cpu(buf[0]);
+                        } else
+                                rt->target_class = SECCLASS_PROCESS;
+                        rc = mls_read_range_helper(&rt->target_range, fp);
                         if (rc)
                                 goto bad;
                         lrt = rt;