1 /* Copyright (C) 1994-2021 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
3
4 The GNU C Library is free software; you can redistribute it and/or
5 modify it under the terms of the GNU Lesser General Public
6 License as published by the Free Software Foundation; either
7 version 2.1 of the License, or (at your option) any later version.
8
9 The GNU C Library is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 Lesser General Public License for more details.
13
14 You should have received a copy of the GNU Lesser General Public
15 License along with the GNU C Library; if not, see
16 <https://www.gnu.org/licenses/>. */
17
18 #include <sys/types.h>
19 #include <sys/mman.h>
20 #include <errno.h>
21 #include <mach.h>
22
23 /* Change the memory protection of the region starting at ADDR and
24 extending LEN bytes to PROT. Returns 0 if successful, -1 for errors
25 (and sets errno). */
26
27 int
__mprotect(void * addr,size_t len,int prot)28 __mprotect (void *addr, size_t len, int prot)
29 {
30 kern_return_t err;
31 vm_prot_t vmprot;
32
33 vmprot = VM_PROT_NONE;
34 if (prot & PROT_READ)
35 vmprot |= VM_PROT_READ;
36 if (prot & PROT_WRITE)
37 vmprot |= VM_PROT_WRITE;
38 if (prot & PROT_EXEC)
39 vmprot |= VM_PROT_EXECUTE;
40
41 if (err = __vm_protect (__mach_task_self (),
42 (vm_address_t) addr, (vm_size_t) len,
43 0, vmprot))
44 {
45 errno = err;
46 return -1;
47 }
48 return 0;
49 }
50 libc_hidden_def (__mprotect)
51 weak_alias (__mprotect, mprotect)
52