mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-23 13:30:06 +00:00
57 lines
1.7 KiB
C
57 lines
1.7 KiB
C
/* Test if a memory region is wholly unwritable. Mach version.
|
|
Copyright (C) 2004-2017 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
|
|
<http://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;
|
|
}
|