selinux: rename comparison functions for clarity

The functions context_cmp(), mls_context_cmp() and ebitmap_cmp() are not
traditional C style compare functions returning -1, 0, and 1 for less
than, equal, and greater than; they only return whether their arguments
are equal.

Signed-off-by: Christian Göttsche <cgzones@googlemail.com>
Signed-off-by: Paul Moore <paul@paul-moore.com>

Author: cgzones

security/selinux/ss/context.c

@@ -20,7 +20,7 @@ u32 context_compute_hash(const struct context *c)
 	 * context struct with only the len & str set (and vice versa)
 	 * under a given policy. Since context structs from different
 	 * policies should never meet, it is safe to hash valid and
-	 * invalid contexts differently. The context_cmp() function
+	 * invalid contexts differently. The context_equal() function
 	 * already operates under the same assumption.
 	 */
 	if (c->len)

security/selinux/ss/context.h

@@ -132,13 +132,13 @@ static inline int mls_context_glblub(struct context *dst,
 	return rc;
 }
 
-static inline int mls_context_cmp(const struct context *c1,
-				  const struct context *c2)
+static inline bool mls_context_equal(const struct context *c1,
+				     const struct context *c2)
 {
 	return ((c1->range.level[0].sens == c2->range.level[0].sens) &&
-		ebitmap_cmp(&c1->range.level[0].cat, &c2->range.level[0].cat) &&
+		ebitmap_equal(&c1->range.level[0].cat, &c2->range.level[0].cat) &&
 		(c1->range.level[1].sens == c2->range.level[1].sens) &&
-		ebitmap_cmp(&c1->range.level[1].cat, &c2->range.level[1].cat));
+		ebitmap_equal(&c1->range.level[1].cat, &c2->range.level[1].cat));
 }
 
 static inline void mls_context_destroy(struct context *c)
@@ -188,15 +188,15 @@ static inline void context_destroy(struct context *c)
 	mls_context_destroy(c);
 }
 
-static inline int context_cmp(const struct context *c1,
-			      const struct context *c2)
+static inline bool context_equal(const struct context *c1,
+				 const struct context *c2)
 {
 	if (c1->len && c2->len)
 		return (c1->len == c2->len && !strcmp(c1->str, c2->str));
 	if (c1->len || c2->len)
 		return 0;
 	return ((c1->user == c2->user) && (c1->role == c2->role) &&
-		(c1->type == c2->type) && mls_context_cmp(c1, c2));
+		(c1->type == c2->type) && mls_context_equal(c1, c2));
 }
 
 u32 context_compute_hash(const struct context *c);

security/selinux/ss/ebitmap.c

@@ -25,12 +25,12 @@
 
 static struct kmem_cache *ebitmap_node_cachep __ro_after_init;
 
-int ebitmap_cmp(const struct ebitmap *e1, const struct ebitmap *e2)
+bool ebitmap_equal(const struct ebitmap *e1, const struct ebitmap *e2)
 {
 	const struct ebitmap_node *n1, *n2;
 
 	if (e1->highbit != e2->highbit)
-		return 0;
+		return false;
 
 	n1 = e1->node;
 	n2 = e2->node;
@@ -41,9 +41,9 @@ int ebitmap_cmp(const struct ebitmap *e1, const struct ebitmap *e2)
 	}
 
 	if (n1 || n2)
-		return 0;
+		return false;
 
-	return 1;
+	return true;
 }
 
 int ebitmap_cpy(struct ebitmap *dst, const struct ebitmap *src)

security/selinux/ss/ebitmap.h

@@ -120,7 +120,7 @@ static inline void ebitmap_node_clr_bit(struct ebitmap_node *n, u32 bit)
 	     (bit) < ebitmap_length(e);               \
 	     (bit) = ebitmap_next_positive(e, &(n), bit))
 
-int ebitmap_cmp(const struct ebitmap *e1, const struct ebitmap *e2);
+bool ebitmap_equal(const struct ebitmap *e1, const struct ebitmap *e2);
 int ebitmap_cpy(struct ebitmap *dst, const struct ebitmap *src);
 int ebitmap_and(struct ebitmap *dst, const struct ebitmap *e1,
 		const struct ebitmap *e2);

security/selinux/ss/mls_types.h

@@ -29,7 +29,7 @@ struct mls_range {
 static inline int mls_level_eq(const struct mls_level *l1,
 			       const struct mls_level *l2)
 {
-	return ((l1->sens == l2->sens) && ebitmap_cmp(&l1->cat, &l2->cat));
+	return ((l1->sens == l2->sens) && ebitmap_equal(&l1->cat, &l2->cat));
 }
 
 static inline int mls_level_dom(const struct mls_level *l1,

security/selinux/ss/services.c

@@ -3331,7 +3331,7 @@ int security_net_peersid_resolve(u32 nlbl_sid, u32 nlbl_type,
 		       __func__, xfrm_sid);
 		goto out;
 	}
-	rc = (mls_context_cmp(nlbl_ctx, xfrm_ctx) ? 0 : -EACCES);
+	rc = (mls_context_equal(nlbl_ctx, xfrm_ctx) ? 0 : -EACCES);
 	if (rc)
 		goto out;
 

security/selinux/ss/sidtab.c

@@ -66,7 +66,7 @@ static u32 context_to_sid(struct sidtab *s, struct context *context, u32 hash)
 	hash_for_each_possible_rcu(s->context_to_sid, entry, list, hash) {
 		if (entry->hash != hash)
 			continue;
-		if (context_cmp(&entry->context, context)) {
+		if (context_equal(&entry->context, context)) {
 			sid = entry->sid;
 			break;
 		}