1 files changed, 23 insertions, 0 deletions

diff --git a/security/selinux/ss/context.h b/security/selinux/ss/context.h
index 0562bacb7b99..2eee0dab524d 100644
--- a/security/selinux/ss/context.h
+++ b/security/selinux/ss/context.h
@@ -55,6 +55,29 @@ out:
         return rc;
 }
 
+/*
+ * Sets both levels in the MLS range of 'dst' to the low level of 'src'.
+ */
+static inline int mls_context_cpy_low(struct context *dst, struct context *src)
+{
+        int rc;
+
+        if (!selinux_mls_enabled)
+                return 0;
+
+        dst->range.level[0].sens = src->range.level[0].sens;
+        rc = ebitmap_cpy(&dst->range.level[0].cat, &src->range.level[0].cat);
+        if (rc)
+                goto out;
+
+        dst->range.level[1].sens = src->range.level[0].sens;
+        rc = ebitmap_cpy(&dst->range.level[1].cat, &src->range.level[0].cat);
+        if (rc)
+                ebitmap_destroy(&dst->range.level[0].cat);
+out:
+        return rc;
+}
+
 static inline int mls_context_cmp(struct context *c1, struct context *c2)
 {
         if (!selinux_mls_enabled)