[src/trunk]: src/sys/kern This is just a temporary stack that holds fake argu...

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

details:   https://anonhg.NetBSD.org/src/rev/13678645ccc9
branches:  trunk
changeset: 347816:13678645ccc9
user:      maxv <maxv%NetBSD.org@localhost>
date:      Sat Sep 17 12:09:22 2016 +0000

description:
This is just a temporary stack that holds fake arguments, and that gets
remapped as RW in sys_execve. Still, in this small window, it does not need
to be executable.

diffstat:

 sys/kern/init_main.c |  12 ++++++------
 1 files changed, 6 insertions(+), 6 deletions(-)

diffs (33 lines):

diff -r 1adee34bf417 -r 13678645ccc9 sys/kern/init_main.c
--- a/sys/kern/init_main.c      Sat Sep 17 12:00:34 2016 +0000
+++ b/sys/kern/init_main.c      Sat Sep 17 12:09:22 2016 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: init_main.c,v 1.482 2016/07/07 06:55:43 msaitoh Exp $  */
+/*     $NetBSD: init_main.c,v 1.483 2016/09/17 12:09:22 maxv Exp $     */
 
 /*-
  * Copyright (c) 2008, 2009 The NetBSD Foundation, Inc.
@@ -97,7 +97,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: init_main.c,v 1.482 2016/07/07 06:55:43 msaitoh Exp $");
+__KERNEL_RCSID(0, "$NetBSD: init_main.c,v 1.483 2016/09/17 12:09:22 maxv Exp $");
 
 #include "opt_ddb.h"
 #include "opt_inet.h"
@@ -931,10 +931,10 @@
         */
        addr = (vaddr_t)STACK_ALLOC(USRSTACK, PAGE_SIZE);
        if (uvm_map(&p->p_vmspace->vm_map, &addr, PAGE_SIZE,
-                    NULL, UVM_UNKNOWN_OFFSET, 0,
-                    UVM_MAPFLAG(UVM_PROT_ALL, UVM_PROT_ALL, UVM_INH_COPY,
-                   UVM_ADV_NORMAL,
-                    UVM_FLAG_FIXED|UVM_FLAG_OVERLAY|UVM_FLAG_COPYONW)) != 0)
+           NULL, UVM_UNKNOWN_OFFSET, 0,
+           UVM_MAPFLAG(UVM_PROT_RW, UVM_PROT_RW, UVM_INH_COPY,
+           UVM_ADV_NORMAL,
+           UVM_FLAG_FIXED|UVM_FLAG_OVERLAY|UVM_FLAG_COPYONW)) != 0)
                panic("init: couldn't allocate argument space");
        p->p_vmspace->vm_maxsaddr = (void *)STACK_MAX(addr, PAGE_SIZE);