[src/netbsd-8]: src/sys/kern revert ticket 50

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

details:   https://anonhg.NetBSD.org/src/rev/7b7aa187fd6d
branches:  netbsd-8
changeset: 850751:7b7aa187fd6d
user:      snj <snj%NetBSD.org@localhost>
date:      Wed Jun 21 18:26:42 2017 +0000

description:
revert ticket 50

diffstat:

 sys/kern/exec_subr.c |  17 ++---------------
 1 files changed, 2 insertions(+), 15 deletions(-)

diffs (45 lines):

diff -r ef6705d7d7e2 -r 7b7aa187fd6d sys/kern/exec_subr.c
--- a/sys/kern/exec_subr.c      Wed Jun 21 18:24:26 2017 +0000
+++ b/sys/kern/exec_subr.c      Wed Jun 21 18:26:42 2017 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: exec_subr.c,v 1.78.2.1 2017/06/21 18:12:40 snj Exp $   */
+/*     $NetBSD: exec_subr.c,v 1.78.2.2 2017/06/21 18:26:42 snj Exp $   */
 
 /*
  * Copyright (c) 1993, 1994, 1996 Christopher G. Demetriou
@@ -31,7 +31,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: exec_subr.c,v 1.78.2.1 2017/06/21 18:12:40 snj Exp $");
+__KERNEL_RCSID(0, "$NetBSD: exec_subr.c,v 1.78.2.2 2017/06/21 18:26:42 snj Exp $");
 
 #include "opt_pax.h"
 
@@ -67,8 +67,6 @@
 #define DPRINTF(a)
 #endif
 
-uint32_t user_stack_guard_size = 1024 * 1024;
-
 /*
  * new_vmcmd():
  *     create a new vmcmd structure and fill in its fields based
@@ -442,17 +440,6 @@
            (uintmax_t)access_size, (uintmax_t)access_linear_min,
            (uintmax_t)noaccess_size, (uintmax_t)noaccess_linear_min));
 
-       if (user_stack_guard_size > 0) {
-#ifdef __MACHINE_STACK_GROWS_UP
-               vsize_t guard_size = MIN(VM_MAXUSER_ADDRESS - epp->ep_maxsaddr, user_stack_guard_size);
-               if (guard_size > 0)
-                       NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, guard_size,
-                           epp->ep_maxsaddr, NULL, 0, VM_PROT_NONE);
-#else
-               NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, user_stack_guard_size,
-                   epp->ep_maxsaddr - user_stack_guard_size, NULL, 0, VM_PROT_NONE);
-#endif
-       }
        if (noaccess_size > 0 && noaccess_size <= MAXSSIZ) {
                NEW_VMCMD2(&epp->ep_vmcmds, vmcmd_map_zero, noaccess_size,
                    noaccess_linear_min, NULL, 0, VM_PROT_NONE, VMCMD_STACK);