mprotect system call exposed to the untrusted code.

src/untrusted/irt/irt.h

 /*
  * 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.
  */
 #ifndef NATIVE_CLIENT_SRC_UNTRUSTED_IRT_IRT_H_
 #define NATIVE_CLIENT_SRC_UNTRUSTED_IRT_IRT_H_
 
 #include <stddef.h>
 #include <sys/types.h>
@@ skipping 73 matching lines @@
 struct nacl_irt_filename {
   int (*open)(const char *pathname, int oflag, mode_t cmode, int *newfd);
   int (*stat)(const char *pathname, struct stat *);
 };
 
 #define NACL_IRT_MEMORY_v0_1    "nacl-irt-memory-0.1"
 struct nacl_irt_memory {
   int (*sysbrk)(void **newbrk);
   int (*mmap)(void **addr, size_t len, int prot, int flags, int fd, off_t off);
   int (*munmap)(void *addr, size_t len);
+  int (*mprotect)(void *addr, size_t len, int prot);

[Mark Seaborn, 2012/10/25 17:05:36]

Don't add mprotect() to this interface.  I assume this is just a mistake left
over from a previous version.

[Petr Hosek, 2012/10/25 18:46:57]

Yes, sorry I have completely forgotten to remove mprotect from the interface.

 };
 
 #define NACL_IRT_DYNCODE_v0_1   "nacl-irt-dyncode-0.1"
 struct nacl_irt_dyncode {
   int (*dyncode_create)(void *dest, const void *src, size_t size);
   int (*dyncode_modify)(void *dest, const void *src, size_t size);
   int (*dyncode_delete)(void *dest, size_t size);
 };
 
 #define NACL_IRT_THREAD_v0_1   "nacl-irt-thread-0.1"
@@ skipping 82 matching lines @@
 #define NACL_IRT_DEV_EXCEPTION_HANDLING_v0_1 \
   "nacl-irt-dev-exception-handling-0.1"
 typedef void (*NaClExceptionHandler)(struct NaClExceptionContext *context);
 struct nacl_irt_dev_exception_handling {
   int (*exception_handler)(NaClExceptionHandler handler,
                            NaClExceptionHandler *old_handler);
   int (*exception_stack)(void *stack, size_t size);
   int (*exception_clear_flag)(void);
 };
 
+/*
+ * NOTE: This is a 'dev' interface which is NOT stable.
+ * In the future, requests for this interface will fail.
+ */
+#define NACL_IRT_DEV_MPROTECT_v0_1 "nacl-irt-dev-mprotect-0.1"
+struct nacl_irt_dev_mprotect {
+  int (*mprotect)(void *addr, size_t len, int prot);
+};
+
 #if defined(__cplusplus)
 }
 #endif
 
 #endif /* NATIVE_CLIENT_SRC_UNTRUSTED_IRT_IRT_H */