Index: sys/kern/imgact_elf.c
===================================================================
--- sys/kern/imgact_elf.c
+++ sys/kern/imgact_elf.c
@@ -2684,7 +2684,7 @@
 	return (flags);
 }
 
-void
+vm_size_t
 __elfN(stackgap)(struct image_params *imgp, uintptr_t *stack_base)
 {
 	uintptr_t range, rbase, gap;
@@ -2692,7 +2692,7 @@
 
 	pct = __elfN(aslr_stack_gap);
 	if (pct == 0)
-		return;
+		return (0);
 	if (pct > 50)
 		pct = 50;
 	range = imgp->eff_stack_sz * pct / 100;
@@ -2700,4 +2700,5 @@
 	gap = rbase % range;
 	gap &= ~(sizeof(u_long) - 1);
 	*stack_base -= gap;
+	return (gap);
 }
Index: sys/kern/kern_exec.c
===================================================================
--- sys/kern/kern_exec.c
+++ sys/kern/kern_exec.c
@@ -1148,6 +1148,7 @@
 		    stack_prot, error, vm_mmap_to_errno(error));
 		return (vm_mmap_to_errno(error));
 	}
+	vmspace->vm_stkgap = 0;
 
 	/*
 	 * vm_ssize and vm_maxsaddr are somewhat antiquated concepts, but they
@@ -1493,12 +1494,16 @@
 void
 exec_stackgap(struct image_params *imgp, uintptr_t *dp)
 {
+	struct proc *p = imgp->proc;
+
 	if (imgp->sysent->sv_stackgap == NULL ||
-	    (imgp->proc->p_fctl0 & (NT_FREEBSD_FCTL_ASLR_DISABLE |
+	    (p->p_fctl0 & (NT_FREEBSD_FCTL_ASLR_DISABLE |
 	    NT_FREEBSD_FCTL_ASG_DISABLE)) != 0 ||
-	    (imgp->map_flags & MAP_ASLR) == 0)
+	    (imgp->map_flags & MAP_ASLR) == 0) {
+		p->p_vmspace->vm_stkgap = 0;
 		return;
-	imgp->sysent->sv_stackgap(imgp, dp);
+	}
+	p->p_vmspace->vm_stkgap = imgp->sysent->sv_stackgap(imgp, dp);
 }
 
 /*
Index: sys/kern/kern_resource.c
===================================================================
--- sys/kern/kern_resource.c
+++ sys/kern/kern_resource.c
@@ -671,6 +671,12 @@
 	if (limp->rlim_max < 0)
 		limp->rlim_max = RLIM_INFINITY;
 
+	if (which == RLIMIT_STACK && limp->rlim_cur != RLIM_INFINITY) {
+		limp->rlim_cur += p->p_vmspace->vm_stkgap;
+		if (limp->rlim_cur > limp->rlim_max)
+			limp->rlim_cur = limp->rlim_max;
+	}
+
 	oldssiz.rlim_cur = 0;
 	newlim = lim_alloc();
 	PROC_LOCK(p);
Index: sys/sys/imgact_elf.h
===================================================================
--- sys/sys/imgact_elf.h
+++ sys/sys/imgact_elf.h
@@ -118,7 +118,7 @@
 int	__elfN(freebsd_fixup)(uintptr_t *, struct image_params *);
 int	__elfN(coredump)(struct thread *, struct vnode *, off_t, int);
 size_t	__elfN(populate_note)(int, void *, void *, size_t, void **);
-void	__elfN(stackgap)(struct image_params *, uintptr_t *);
+vm_size_t	__elfN(stackgap)(struct image_params *, uintptr_t *);
 int	__elfN(freebsd_copyout_auxargs)(struct image_params *, uintptr_t);
 void	__elfN(puthdr)(struct thread *, void *, size_t, int, size_t, int);
 void	__elfN(prepare_notes)(struct thread *, struct note_info_list *,
Index: sys/sys/sysent.h
===================================================================
--- sys/sys/sysent.h
+++ sys/sys/sysent.h
@@ -119,7 +119,7 @@
 	void		(*sv_elf_core_prepare_notes)(struct thread *,
 			    struct note_info_list *, size_t *);
 	int		(*sv_imgact_try)(struct image_params *);
-	void		(*sv_stackgap)(struct image_params *, uintptr_t *);
+	vm_size_t	(*sv_stackgap)(struct image_params *, uintptr_t *);
 	int		(*sv_copyout_auxargs)(struct image_params *,
 			    uintptr_t);
 	int		sv_minsigstksz;	/* minimum signal stack size */
Index: sys/vm/vm_map.h
===================================================================
--- sys/vm/vm_map.h
+++ sys/vm/vm_map.h
@@ -293,6 +293,7 @@
 	caddr_t vm_taddr;	/* (c) user virtual address of text */
 	caddr_t vm_daddr;	/* (c) user virtual address of data */
 	caddr_t vm_maxsaddr;	/* user VA at max stack growth */
+	vm_size_t vm_stkgap;	/* stack gap size in bytes */
 	u_int vm_refcnt;	/* number of references */
 	/*
 	 * Keep the PMAP last, so that CPU-specific variations of that
Index: sys/vm/vm_map.c
===================================================================
--- sys/vm/vm_map.c
+++ sys/vm/vm_map.c
@@ -343,6 +343,7 @@
 	vm->vm_taddr = 0;
 	vm->vm_daddr = 0;
 	vm->vm_maxsaddr = 0;
+	vm->vm_stkgap = 0;
 	return (vm);
 }
 
@@ -4265,6 +4266,7 @@
 	vm2->vm_taddr = vm1->vm_taddr;
 	vm2->vm_daddr = vm1->vm_daddr;
 	vm2->vm_maxsaddr = vm1->vm_maxsaddr;
+	vm2->vm_stkgap = vm1->vm_stkgap;
 	vm_map_lock(old_map);
 	if (old_map->busy)
 		vm_map_wait_busy(old_map);