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/* Test if a memory region is wholly unwritable. Mach version.
Copyright (C) 2004-2020 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
#include <stdlib.h>
#include <stdint.h>
#include <mach.h>
/* Return 1 if the whole area PTR .. PTR+SIZE is not writable.
Return -1 if it is writable. */
int
__readonly_area (const char *ptr, size_t size)
{
vm_address_t region_address = (uintptr_t) ptr;
vm_size_t region_length = size;
vm_prot_t protection;
vm_prot_t max_protection;
vm_inherit_t inheritance;
boolean_t is_shared;
mach_port_t object_name;
vm_offset_t offset;
while (__vm_region (__mach_task_self (),
®ion_address, ®ion_length,
&protection, &max_protection, &inheritance, &is_shared,
&object_name, &offset) == KERN_SUCCESS
&& region_address <= (uintptr_t) ptr)
{
region_address += region_length;
if (region_address < (uintptr_t) ptr)
continue;
if (protection & VM_PROT_WRITE)
return -1;
if (region_address - (uintptr_t) ptr >= size)
break;
}
return 1;
}
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