NaCl: disable unimplmented Mojo APIs.

nacl_bindings_generator/generate_nacl_bindings.py

 #!/usr/bin/python
 # Copyright 2014 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 # pylint: disable=W0104,W0106,F0401,R0201
 
 import errno
 import os.path
 import sys
@@ skipping 289 matching lines @@
 
 # A trusted wrapper that validates the arguments passed from untrusted code
 # before passing them to the underlying public Mojo API.
 def GenerateMojoSyscall(functions, common_vars, out):
   template = jinja_env.get_template('mojo_syscall.cc.tmpl')
 
   code = CodeWriter()
   code.PushMargin()
 
   for f in functions:
+    is_implemented = True
+
+    # Mojo API calls that take or return pointers are currently not supported.
+    # The underlying Mojo implementation is unaware of NaCl's address space. In
+    # addition, if we pass blindly pass the parameters through to the underlying
+    # Mojo API, memory corruption can result from pointer-size mistmatches.
+    for p in f.params:
+      if p.base_type.endswith("*"):
+        is_implemented = False
+
     impls = [ImplForParam(p) for p in f.params]
     impls.append(ImplForParam(f.result_param))
 
     code << 'case %d:' % f.uid
 
+    if not is_implemented:
+      with code.Indent():
+        code << 'fprintf(stderr, "%s not implemented\\n");' % f.name
+        code << 'return -1;'
+      continue
+
     code.PushMargin()
 
     code << '{'
 
     with code.Indent():
       num_params = len(f.params) + 2
       code << 'if (num_params != %d) {' % num_params
       with code.Indent():
         code << 'return -1;'
       code << '}'
@@ skipping 169 matching lines @@
   GenerateMojoSyscall(mojo.functions, common_vars, out)
 
   out = OutFile(full_platform_dir, 'mojo_irt.h')
   GenerateMojoIrtHeader(mojo.functions, common_vars, out)
 
   out = OutFile(full_bindings_dir, 'mojo_irt.c')
   GenerateMojoIrtImplementation(mojo.functions, common_vars, out)
 
 if __name__ == '__main__':
   main()