[PATCH 08/17] flask: remove unused secondary context in ocontext

[Daniel De Graaf <dgdegra@tycho.nsa.gov>]

This field was originally used in Linux for a default message code for
network interfaces.  It has never been used in Xen, so remove it.

Signed-off-by: Daniel De Graaf <dgdegra@tycho.nsa.gov>
---
 xen/xsm/flask/ss/policydb.c | 21 ++++++++--------
 xen/xsm/flask/ss/policydb.h |  4 ++--
 xen/xsm/flask/ss/services.c | 58 ++++++++++++++++++++++-----------------------
 3 files changed, 41 insertions(+), 42 deletions(-)

diff --git a/xen/xsm/flask/ss/policydb.c b/xen/xsm/flask/ss/policydb.c
index eebfe9c..00b5390 100644
--- a/xen/xsm/flask/ss/policydb.c
+++ b/xen/xsm/flask/ss/policydb.c
@@ -638,8 +638,7 @@ static int (*destroy_f[SYM_NUM]) (void *key, void *datum, void *datap) =
 
 static void ocontext_destroy(struct ocontext *c, int i)
 {
-    context_destroy(&c->context[0]);
-    context_destroy(&c->context[1]);
+    context_destroy(&c->context);
     if ( i == OCON_ISID || i == OCON_DTREE )
         xfree(c->u.name);
     xfree(c);
@@ -747,14 +746,14 @@ int policydb_load_isids(struct policydb *p, struct sidtab *s)
     head = p->ocontexts[OCON_ISID];
     for ( c = head; c; c = c->next )
     {
-        if ( !c->context[0].user )
+        if ( !c->context.user )
         {
             printk(KERN_ERR "Flask:  SID %s was never "
                    "defined.\n", c->u.name);
             rc = -EINVAL;
             goto out;
         }
-        if ( sidtab_insert(s, c->sid[0], &c->context[0]) )
+        if ( sidtab_insert(s, c->sid, &c->context) )
         {
             printk(KERN_ERR "Flask:  unable to load initial "
                    "SID %s.\n", c->u.name);
@@ -2015,8 +2014,8 @@ int policydb_read(struct policydb *p, void *fp)
                 rc = next_entry(buf, fp, sizeof(u32));
                 if ( rc < 0 )
                     goto bad;
-                c->sid[0] = le32_to_cpu(buf[0]);
-                rc = context_read_and_validate(&c->context[0], p, fp);
+                c->sid = le32_to_cpu(buf[0]);
+                rc = context_read_and_validate(&c->context, p, fp);
                 if ( rc )
                     goto bad;
                 break;
@@ -2031,7 +2030,7 @@ int policydb_read(struct policydb *p, void *fp)
                 if ( rc < 0 )
                     goto bad;
                 c->u.pirq = le32_to_cpu(buf[0]);
-                rc = context_read_and_validate(&c->context[0], p, fp);
+                rc = context_read_and_validate(&c->context, p, fp);
                 if ( rc )
                     goto bad;
                 break;
@@ -2047,7 +2046,7 @@ int policydb_read(struct policydb *p, void *fp)
                     goto bad;
                 c->u.ioport.low_ioport = le32_to_cpu(buf[0]);
                 c->u.ioport.high_ioport = le32_to_cpu(buf[1]);
-                rc = context_read_and_validate(&c->context[0], p, fp);
+                rc = context_read_and_validate(&c->context, p, fp);
                 if ( rc )
                     goto bad;
                 break;
@@ -2075,7 +2074,7 @@ int policydb_read(struct policydb *p, void *fp)
                     c->u.iomem.low_iomem = le32_to_cpu(buf[0]);
                     c->u.iomem.high_iomem = le32_to_cpu(buf[1]);
                 }
-                rc = context_read_and_validate(&c->context[0], p, fp);
+                rc = context_read_and_validate(&c->context, p, fp);
                 if ( rc )
                     goto bad;
                 break;
@@ -2090,7 +2089,7 @@ int policydb_read(struct policydb *p, void *fp)
                 if ( rc < 0 )
                     goto bad;
                 c->u.device = le32_to_cpu(buf[0]);
-                rc = context_read_and_validate(&c->context[0], p, fp);
+                rc = context_read_and_validate(&c->context, p, fp);
                 if ( rc )
                     goto bad;
                 break;
@@ -2113,7 +2112,7 @@ int policydb_read(struct policydb *p, void *fp)
                 if ( rc < 0 )
                     goto bad;
                 c->u.name[len] = 0;
-                rc = context_read_and_validate(&c->context[0], p, fp);
+                rc = context_read_and_validate(&c->context, p, fp);
                 if ( rc )
                     goto bad;
                 break;
diff --git a/xen/xsm/flask/ss/policydb.h b/xen/xsm/flask/ss/policydb.h
index 30be71a..f158ce3 100644
--- a/xen/xsm/flask/ss/policydb.h
+++ b/xen/xsm/flask/ss/policydb.h
@@ -158,8 +158,8 @@ struct ocontext {
                 u64 high_iomem;
         } iomem;
     } u;
-    struct context context[2];    /* security context(s) */
-    u32 sid[2];    /* SID(s) */
+    struct context context;
+    u32 sid;
     struct ocontext *next;
 };
 
diff --git a/xen/xsm/flask/ss/services.c b/xen/xsm/flask/ss/services.c
index 9da358b..c590440 100644
--- a/xen/xsm/flask/ss/services.c
+++ b/xen/xsm/flask/ss/services.c
@@ -1488,13 +1488,13 @@ int security_irq_sid(int pirq, u32 *out_sid)
 
     if ( c )
     {
-        if ( !c->sid[0] )
+        if ( !c->sid )
         {
-            rc = sidtab_context_to_sid(&sidtab, &c->context[0], &c->sid[0]);
+            rc = sidtab_context_to_sid(&sidtab, &c->context, &c->sid);
             if ( rc )
                 goto out;
         }
-        *out_sid = c->sid[0];
+        *out_sid = c->sid;
     }
     else
     {
@@ -1528,13 +1528,13 @@ int security_iomem_sid(unsigned long mfn, u32 *out_sid)
 
     if ( c )
     {
-        if ( !c->sid[0] )
+        if ( !c->sid )
         {
-            rc = sidtab_context_to_sid(&sidtab, &c->context[0], &c->sid[0]);
+            rc = sidtab_context_to_sid(&sidtab, &c->context, &c->sid);
             if ( rc )
                 goto out;
         }
-        *out_sid = c->sid[0];
+        *out_sid = c->sid;
     }
     else
     {
@@ -1559,9 +1559,9 @@ int security_iterate_iomem_sids(unsigned long start, unsigned long end,
         c = c->next;
 
     while (c && c->u.iomem.low_iomem <= end) {
-        if (!c->sid[0])
+        if (!c->sid)
         {
-            rc = sidtab_context_to_sid(&sidtab, &c->context[0], &c->sid[0]);
+            rc = sidtab_context_to_sid(&sidtab, &c->context, &c->sid);
             if ( rc )
                 goto out;
         }
@@ -1574,11 +1574,11 @@ int security_iterate_iomem_sids(unsigned long start, unsigned long end,
         }
         if (end <= c->u.iomem.high_iomem) {
             /* iteration ends in the middle of this range */
-            rc = fn(data, c->sid[0], start, end);
+            rc = fn(data, c->sid, start, end);
             goto out;
         }
 
-        rc = fn(data, c->sid[0], start, c->u.iomem.high_iomem);
+        rc = fn(data, c->sid, start, c->u.iomem.high_iomem);
         if (rc)
             goto out;
         start = c->u.iomem.high_iomem + 1;
@@ -1616,13 +1616,13 @@ int security_ioport_sid(u32 ioport, u32 *out_sid)
 
     if ( c )
     {
-        if ( !c->sid[0] )
+        if ( !c->sid )
         {
-            rc = sidtab_context_to_sid(&sidtab, &c->context[0], &c->sid[0]);
+            rc = sidtab_context_to_sid(&sidtab, &c->context, &c->sid);
             if ( rc )
                 goto out;
         }
-        *out_sid = c->sid[0];
+        *out_sid = c->sid;
     }
     else
     {
@@ -1647,9 +1647,9 @@ int security_iterate_ioport_sids(u32 start, u32 end,
         c = c->next;
 
     while (c && c->u.ioport.low_ioport <= end) {
-        if (!c->sid[0])
+        if (!c->sid)
         {
-            rc = sidtab_context_to_sid(&sidtab, &c->context[0], &c->sid[0]);
+            rc = sidtab_context_to_sid(&sidtab, &c->context, &c->sid);
             if ( rc )
                 goto out;
         }
@@ -1662,11 +1662,11 @@ int security_iterate_ioport_sids(u32 start, u32 end,
         }
         if (end <= c->u.ioport.high_ioport) {
             /* iteration ends in the middle of this range */
-            rc = fn(data, c->sid[0], start, end);
+            rc = fn(data, c->sid, start, end);
             goto out;
         }
 
-        rc = fn(data, c->sid[0], start, c->u.ioport.high_ioport);
+        rc = fn(data, c->sid, start, c->u.ioport.high_ioport);
         if (rc)
             goto out;
         start = c->u.ioport.high_ioport + 1;
@@ -1703,13 +1703,13 @@ int security_device_sid(u32 device, u32 *out_sid)
 
     if ( c )
     {
-        if ( !c->sid[0] )
+        if ( !c->sid )
         {
-            rc = sidtab_context_to_sid(&sidtab, &c->context[0], &c->sid[0]);
+            rc = sidtab_context_to_sid(&sidtab, &c->context, &c->sid);
             if ( rc )
                 goto out;
         }
-        *out_sid = c->sid[0];
+        *out_sid = c->sid;
     }
     else
     {
@@ -1849,13 +1849,13 @@ int security_devicetree_sid(const char *path, u32 *out_sid)
 
     if ( c )
     {
-        if ( !c->sid[0] )
+        if ( !c->sid )
         {
-            rc = sidtab_context_to_sid(&sidtab, &c->context[0], &c->sid[0]);
+            rc = sidtab_context_to_sid(&sidtab, &c->context, &c->sid);
             if ( rc )
                 goto out;
         }
-        *out_sid = c->sid[0];
+        *out_sid = c->sid;
     }
     else
     {
@@ -2081,7 +2081,7 @@ int security_ocontext_add( u32 ocon, unsigned long low, unsigned long high
 
     if ( (add = xzalloc(struct ocontext)) == NULL )
         return -ENOMEM;
-    add->sid[0] = sid;
+    add->sid = sid;
 
     POLICY_WRLOCK;
     switch( ocon )
@@ -2099,7 +2099,7 @@ int security_ocontext_add( u32 ocon, unsigned long low, unsigned long high
         {
             if ( c->u.pirq == add->u.pirq )
             {
-                if ( c->sid[0] == sid )
+                if ( c->sid == sid )
                     break;
                 printk("%s: Duplicate pirq %d\n", __FUNCTION__, add->u.pirq);
                 ret = -EEXIST;
@@ -2130,7 +2130,7 @@ int security_ocontext_add( u32 ocon, unsigned long low, unsigned long high
         if (c && c->u.ioport.low_ioport <= high)
         {
             if (c->u.ioport.low_ioport == low &&
-                c->u.ioport.high_ioport == high && c->sid[0] == sid)
+                c->u.ioport.high_ioport == high && c->sid == sid)
                 break;
 
             printk("%s: IO Port overlap with entry %#x - %#x\n",
@@ -2164,7 +2164,7 @@ int security_ocontext_add( u32 ocon, unsigned long low, unsigned long high
         if (c && c->u.iomem.low_iomem <= high)
         {
             if (c->u.iomem.low_iomem == low &&
-                c->u.iomem.high_iomem == high && c->sid[0] == sid)
+                c->u.iomem.high_iomem == high && c->sid == sid)
                 break;
 
             printk("%s: IO Memory overlap with entry %#"PRIx64" - %#"PRIx64"\n",
@@ -2195,7 +2195,7 @@ int security_ocontext_add( u32 ocon, unsigned long low, unsigned long high
         {
             if ( c->u.device == add->u.device )
             {
-                if ( c->sid[0] == sid )
+                if ( c->sid == sid )
                     break;
 
                 printk("%s: Duplicate PCI Device %#x\n", __FUNCTION__,
@@ -2359,7 +2359,7 @@ int security_devicetree_setlabel(char *path, u32 sid)
             xfree(path);
             return -ENOMEM;
         }
-        add->sid[0] = sid;
+        add->sid = sid;
         add->u.name = path;
     }
     else
-- 
2.7.4


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