hurd: permit to use mlock from non-root process

* sysdeps/mach/hurd/mlock.c (mlock): When __get_privileged_ports
returns an error, also try to use host port from __mach_host_self for
the __vm_wire call.
* sysdeps/mach/hurd/munlock.c (munlock): Likewise.

1 files changed, 7 insertions, 6 deletions

diff --git a/sysdeps/mach/hurd/mlock.c b/sysdeps/mach/hurd/mlock.c
index 10078e7f80..8ef568ea4c 100644
--- a/sysdeps/mach/hurd/mlock.c
+++ b/sysdeps/mach/hurd/mlock.c
@@ -28,19 +28,20 @@
 int
 mlock (const void *addr, size_t len)
 {
-  mach_port_t hostpriv;
+  mach_port_t host;
   vm_address_t page;
   error_t err;
 
-  err = __get_privileged_ports (&hostpriv, NULL);
+  err = __get_privileged_ports (&host, NULL);
   if (err)
-    return __hurd_fail (EPERM);
+    host = __mach_host_self();
 
   page = trunc_page ((vm_address_t) addr);
   len = round_page ((vm_address_t) addr + len) - page;
-  err = __vm_wire (hostpriv, __mach_task_self (), page, len,
-		   VM_PROT_READ);
-  __mach_port_deallocate (__mach_task_self (), hostpriv);
+
+  err = __vm_wire (host, __mach_task_self (), page, len, VM_PROT_READ);
+  if (host != __mach_host_self())
+    __mach_port_deallocate (__mach_task_self (), host);
 
   return err ? __hurd_fail (err) : 0;
 }