[src/netbsd-3]: src/sys/uvm Pull up revision 1.85 (requested by nathanw in ti...

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

details:   https://anonhg.NetBSD.org/src/rev/40610d5d585a
branches:  netbsd-3
changeset: 575860:40610d5d585a
user:      snj <snj%NetBSD.org@localhost>
date:      Sun May 22 19:39:28 2005 +0000

description:
Pull up revision 1.85 (requested by nathanw in ticket #322):
uvm_coredump_walkmap(): Set UVM_COREDUMP_NODUMP on regions whose
protection does not include VM_PROT_READ, so that the core dumping
doesn't error out with EFAULT when trying to write that region.
Addresses PR kern/30143; approach suggested by chs@.

diffstat:

 sys/uvm/uvm_glue.c |  9 +++++++--
 1 files changed, 7 insertions(+), 2 deletions(-)

diffs (37 lines):

diff -r 05a034406ba9 -r 40610d5d585a sys/uvm/uvm_glue.c
--- a/sys/uvm/uvm_glue.c        Sun May 22 19:33:34 2005 +0000
+++ b/sys/uvm/uvm_glue.c        Sun May 22 19:39:28 2005 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: uvm_glue.c,v 1.83 2005/02/08 08:22:37 yamt Exp $       */
+/*     $NetBSD: uvm_glue.c,v 1.83.4.1 2005/05/22 19:39:28 snj Exp $    */
 
 /*
  * Copyright (c) 1997 Charles D. Cranor and Washington University.
@@ -67,7 +67,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: uvm_glue.c,v 1.83 2005/02/08 08:22:37 yamt Exp $");
+__KERNEL_RCSID(0, "$NetBSD: uvm_glue.c,v 1.83.4.1 2005/05/22 19:39:28 snj Exp $");
 
 #include "opt_kgdb.h"
 #include "opt_kstack.h"
@@ -745,6 +745,8 @@
                 *     (eg. an executable text section).
                 *
                 * (3) the region's object is a device.
+                *
+                * (4) the region is unreadable by the process.
                 */
 
                KASSERT(!UVM_ET_ISSUBMAP(entry));
@@ -762,6 +764,9 @@
                    UVM_OBJ_IS_DEVICE(entry->object.uvm_obj)) {
                        state.flags |= UVM_COREDUMP_NODUMP;
                }
+               if ((entry->protection & VM_PROT_READ) == 0) {
+                       state.flags |= UVM_COREDUMP_NODUMP;
+               }
                if (state.start >= (vaddr_t)vm->vm_maxsaddr) {
                        state.flags |= UVM_COREDUMP_STACK;
                }