mprotect system call exposed to the untrusted code.

src/untrusted/nacl/sys_private.c

 /*
  * Copyright (c) 2012 The Native Client Authors. All rights reserved.
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 /*
  * This file defines various POSIX-like functions directly using NaCl
  * syscall trampolines.  For normal application use, these are defined
  * instead using the IRT function tables.  Here we're defining the versions
@@ skipping 88 matching lines @@
     errno = -(int32_t) rv;
     return MAP_FAILED;
   }
   return (void *) (uintptr_t) rv;
 }
 
 int munmap(void *start, size_t length) {
   return errno_call(NACL_SYSCALL(munmap)(start, length));
 }
 
+int mprotect(void *start, size_t length, int prot) {
+  return errno_call(NACL_SYSCALL(mprotect)(start, length, prot));
+}
+
 int open(char const *pathname, int oflag, ...) {
   mode_t cmode;
   va_list ap;
 
   if (oflag & O_CREAT) {
     va_start(ap, oflag);
     cmode = va_arg(ap, mode_t);
     va_end(ap);
   } else {
     cmode = 0;
@@ skipping 62 matching lines @@
 /*
  * These have to be weak because the IRT defines its own versions.
  */
 __attribute__((weak)) int nacl_tls_init(void *thread_ptr) {
   return -NACL_SYSCALL(tls_init)(thread_ptr);
 }
 
 __attribute__((weak)) void *nacl_tls_get(void) {
   return NACL_SYSCALL(tls_get)();
 }