sysdeps/mach/mprotect.c

   1 /* Copyright (C) 1994-2022 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
  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)