5 files changed, 12 insertions, 4 deletions

diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c
index b29059ecc045..78c3f98fcdcf 100644
--- a/security/selinux/hooks.c
+++ b/security/selinux/hooks.c
@@ -2569,12 +2569,16 @@ static int file_map_prot_check(struct file *file, unsigned long prot, int shared
 }
 
 static int selinux_file_mmap(struct file *file, unsigned long reqprot,
-                             unsigned long prot, unsigned long flags)
+                             unsigned long prot, unsigned long flags,
+                             unsigned long addr, unsigned long addr_only)
 {
-        int rc;
+        int rc = 0;
+        u32 sid = ((struct task_security_struct*)(current->security))->sid;
 
-        rc = secondary_ops->file_mmap(file, reqprot, prot, flags);
-        if (rc)
+        if (addr < mmap_min_addr)
+                rc = avc_has_perm(sid, sid, SECCLASS_MEMPROTECT,
+                                  MEMPROTECT__MMAP_ZERO, NULL);
+        if (rc || addr_only)
                 return rc;
 
         if (selinux_checkreqprot)
diff --git a/security/selinux/include/av_perm_to_string.h b/security/selinux/include/av_perm_to_string.h
index b83e74012a97..049bf69429b6 100644
--- a/security/selinux/include/av_perm_to_string.h
+++ b/security/selinux/include/av_perm_to_string.h
@@ -158,3 +158,4 @@
    S_(SECCLASS_KEY, KEY__CREATE, "create")
    S_(SECCLASS_DCCP_SOCKET, DCCP_SOCKET__NODE_BIND, "node_bind")
    S_(SECCLASS_DCCP_SOCKET, DCCP_SOCKET__NAME_CONNECT, "name_connect")
+   S_(SECCLASS_MEMPROTECT, MEMPROTECT__MMAP_ZERO, "mmap_zero")
diff --git a/security/selinux/include/av_permissions.h b/security/selinux/include/av_permissions.h
index 5fee1735bffe..eda89a2ec635 100644
--- a/security/selinux/include/av_permissions.h
+++ b/security/selinux/include/av_permissions.h
@@ -823,3 +823,4 @@
 #define DCCP_SOCKET__NAME_BIND                    0x00200000UL
 #define DCCP_SOCKET__NODE_BIND                    0x00400000UL
 #define DCCP_SOCKET__NAME_CONNECT                 0x00800000UL
+#define MEMPROTECT__MMAP_ZERO                     0x00000001UL
diff --git a/security/selinux/include/class_to_string.h b/security/selinux/include/class_to_string.h
index 378799068441..e77de0e62ea0 100644
--- a/security/selinux/include/class_to_string.h
+++ b/security/selinux/include/class_to_string.h
@@ -63,3 +63,4 @@
     S_("key")
     S_(NULL)
     S_("dccp_socket")
+    S_("memprotect")
diff --git a/security/selinux/include/flask.h b/security/selinux/include/flask.h
index 35f309f47873..a9c2b20f14b5 100644
--- a/security/selinux/include/flask.h
+++ b/security/selinux/include/flask.h
@@ -49,6 +49,7 @@
 #define SECCLASS_PACKET                                  57
 #define SECCLASS_KEY                                     58
 #define SECCLASS_DCCP_SOCKET                             60
+#define SECCLASS_MEMPROTECT                              61
 
 /*
  * Security identifier indices for initial entities