1  /* Copyright (C) 1994-2023 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)