sysdeps/unix/sysv/linux/pkey_mprotect.c

   1 /* mprotect with a memory protection key.
   2    Copyright (C) 2017-2024 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, see
  17    <https://www.gnu.org/licenses/>.  */
  18
  19 #include <errno.h>
  20 #include <sys/mman.h>
  21 #include <sys/syscall.h>
  22 #include <sysdep.h>
  23
  24 int
  25 pkey_mprotect (void *addr, size_t len, int prot, int pkey)
  26 {
  27   if (pkey == -1)
  28     /* If the key is -1, the system call is precisely equivalent to
  29        mprotect.  */
  30     return __mprotect (addr, len, prot);
  31   return INLINE_SYSCALL_CALL (pkey_mprotect, addr, len, prot, pkey);
  32 }