Bug 723939 part 1 - When reserving memory for the loaded library, ensure...

  }

  /* Reserve enough memory to map the complete virtual address space for this

   * library. */

  elf->base.Assign(mmap(NULL, max_vaddr, PROT_NONE, MAP_PRIVATE | MAP_ANONYMOUS,

   * library.

   * As we are using the base address from here to mmap something else with

   * MAP_FIXED | MAP_SHARED, we need to make sure these mmaps will work. For

   * instance, on armv6, MAP_SHARED mappings require a 16k alignment, but mmap

   * MAP_PRIVATE only returns a 4k aligned address. So we first get a base

   * address with MAP_SHARED, which guarantees the kernel returns an address

   * that we'll be able to use with MAP_FIXED, and then remap MAP_PRIVATE at

   * the same address, because of some bad side effects of keeping it as

   * MAP_SHARED. */

  elf->base.Assign(mmap(NULL, max_vaddr, PROT_NONE, MAP_SHARED | MAP_ANONYMOUS,

                      -1, 0), max_vaddr);

  if (elf->base == MAP_FAILED) {

  if ((elf->base == MAP_FAILED) ||

      (mmap(elf->base, max_vaddr, PROT_NONE,

            MAP_PRIVATE | MAP_ANONYMOUS | MAP_FIXED, -1, 0) != elf->base)) {

    log("%s: Failed to mmap", elf->GetPath());

    return NULL;

  }