Modify the NaCl_page_alloc_hint function to use VirtualQuery to check

src/trusted/service_runtime/sel_memory.h

 /*
  * Copyright (c) 2011 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.
  */
 
 /*
  * NaCl Simple/secure ELF loader (NaCl SEL) memory protection abstractions.
  */
 
 #ifndef NATIVE_CLIENT_SRC_TRUSTED_SERVICE_RUNTIME_SEL_MEMORY_H_
 #define NATIVE_CLIENT_SRC_TRUSTED_SERVICE_RUNTIME_SEL_MEMORY_H_ 1
 
 #ifdef __cplusplus
 extern "C" {
 #endif /* __cplusplus */
 
 /*
 * We do not use posix_memalign but instead directly attempt to mmap
 * (or VirtualAlloc) memory into aligned addresses, since we want to be
 * able to munmap pages to map in shared memory pages for the NaCl
 * versions of shmat or mmap, esp if SHM_REMAP is used.  Note that the
 * Windows ABI has 4KB pages for operations like page protection, but
 * 64KB allocation granularity (see nacl_config.h), and since we want
 * host-OS indistinguishability, this means we inherit this restriction
 * into our least-common-denominator design.
 */
 #define MAX_RETRIES     1024
 
+int   NaCl_find_sandbox_memory(void   **p,

[Mark Seaborn, 2011/08/16 17:34:10]

Maybe name it something like "NaCl_find_prereserved_sandbox_memory()", to make
it a little clearer?

[bbudge, 2011/08/16 19:46:22]

Done.

+                               size_t num_bytes);
+
 int   NaCl_page_alloc(void    **p,
                       size_t  num_bytes) NACL_WUR;
 
 int   NaCl_page_alloc_randomized(void   **p,
                                  size_t num_bytes) NACL_WUR;
 
 int   NaCl_page_alloc_at_addr(void **p,
                               size_t  size) NACL_WUR;
 
 void  NaCl_page_free(void     *p,
                      size_t   num_bytes);
 
 int   NaCl_mprotect(void          *addr,
                     size_t        len,
                     int           prot) NACL_WUR;
 
 int   NaCl_madvise(void           *start,
                    size_t         length,
                    int            advice) NACL_WUR;
 
 
 #ifdef __cplusplus
 }
 #endif /* __cplusplus */
 
 #endif /*  NATIVE_CLIENT_SRC_TRUSTED_SERVICE_RUNTIME_SEL_MEMORY_H_ */