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don't make zero-sized mappings.

This commit is contained in:
yamt 2003-08-21 15:17:03 +00:00
parent dc46f864d1
commit a7f9b1d8e0
1 changed files with 7 additions and 4 deletions
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11
sys/kern/exec_subr.c
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@ -1,4 +1,4 @@
/* $NetBSD: exec_subr.c,v 1.38 2003/08/08 18:53:14 christos Exp $ */
/* $NetBSD: exec_subr.c,v 1.39 2003/08/21 15:17:03 yamt 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 1.38 2003/08/08 18:53:14 christos Exp $");
__KERNEL_RCSID(0, "$NetBSD: exec_subr.c,v 1.39 2003/08/21 15:17:03 yamt Exp $");
#include <sys/param.h>
#include <sys/systm.h>
@ -342,8 +342,11 @@ exec_setup_stack(struct proc *p, struct exec_package *epp)
noaccess_size = max_stack_size - access_size;
noaccess_linear_min = (u_long)STACK_ALLOC(STACK_GROW(epp->ep_minsaddr,
access_size), noaccess_size);
NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, noaccess_size,
noaccess_linear_min, NULLVP, 0, VM_PROT_NONE);
if (noaccess_size > 0) {
NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, noaccess_size,
noaccess_linear_min, NULLVP, 0, VM_PROT_NONE);
}
KASSERT(access_size > 0);
NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, access_size,
access_linear_min, NULLVP, 0,
VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE);