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