1 files changed, 37 insertions, 0 deletions
diff --git a/sysdeps/unix/sysv/linux/pkey_mprotect.c b/sysdeps/unix/sysv/linux/pkey_mprotect.c
new file mode 100644
index 0000000000..a78fe293b2
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/pkey_mprotect.c
@@ -0,0 +1,37 @@
+/* mprotect with a memory protection key.
+   Copyright (C) 2017 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+#include <errno.h>
+#include <sys/mman.h>
+#include <sys/syscall.h>
+#include <sysdep.h>
+
+int
+pkey_mprotect (void *addr, size_t len, int prot, int pkey)
+{
+  if (pkey == -1)
+    /* If the key is -1, the system call is precisely equivalent to
+       mprotect.  */
+    return __mprotect (addr, len, prot);
+#ifdef __NR_pkey_mprotect
+  return INLINE_SYSCALL_CALL (pkey_mprotect, addr, len, prot, pkey);
+#else
+  __set_errno (ENOSYS);
+  return -1;
+#endif
+}