mirror of
https://sourceware.org/git/glibc.git
synced 2024-12-23 03:10:05 +00:00
2004-10-19 Roland McGrath <roland@frob.com>
* sysdeps/mach/readonly-area.c: New file.
This commit is contained in:
parent
356e414295
commit
604208c4df
57
sysdeps/mach/readonly-area.c
Normal file
57
sysdeps/mach/readonly-area.c
Normal file
@ -0,0 +1,57 @@
|
||||
/* Test if a memory region is wholly unwritable. Mach version.
|
||||
Copyright (C) 2004 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, write to the Free
|
||||
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
|
||||
02111-1307 USA. */
|
||||
|
||||
#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;
|
||||
}
|
Loading…
Reference in New Issue
Block a user