[src/trunk]: src/sys/uvm In uvm_useracc(), make sure we have a read lock on t...

[thorpej <thorpej%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/93c7ea465892
branches:  trunk
changeset: 473732:93c7ea465892
user:      thorpej <thorpej%NetBSD.org@localhost>
date:      Thu Jun 17 05:57:33 1999 +0000

description:
In uvm_useracc(), make sure we have a read lock on the map before
calling uvm_map_checkprot().

diffstat:

 sys/uvm/uvm_glue.c |  13 ++++++++++---
 1 files changed, 10 insertions(+), 3 deletions(-)

diffs (30 lines):

diff -r b6c8e6a1b5ea -r 93c7ea465892 sys/uvm/uvm_glue.c
--- a/sys/uvm/uvm_glue.c        Thu Jun 17 05:11:47 1999 +0000
+++ b/sys/uvm/uvm_glue.c        Thu Jun 17 05:57:33 1999 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: uvm_glue.c,v 1.24 1999/06/17 00:24:10 thorpej Exp $    */
+/*     $NetBSD: uvm_glue.c,v 1.25 1999/06/17 05:57:33 thorpej Exp $    */
 
 /* 
  * Copyright (c) 1997 Charles D. Cranor and Washington University.
@@ -157,11 +157,18 @@
        size_t len;
        int rw;
 {
+       vm_map_t map;
        boolean_t rv;
        vm_prot_t prot = rw == B_READ ? VM_PROT_READ : VM_PROT_WRITE;
 
-       rv = uvm_map_checkprot(&curproc->p_vmspace->vm_map,
-                       trunc_page(addr), round_page(addr+len), prot);
+       /* XXX curproc */
+       map = &curproc->p_vmspace->vm_map;
+
+       vm_map_lock_read(map);
+       rv = uvm_map_checkprot(map, trunc_page(addr), round_page(addr+len),
+           prot);
+       vm_map_unlock_read(map);
+
        return(rv);
 }