From 46d35d415aa9664b0ddc98a76e453eec20af0016 Mon Sep 17 00:00:00 2001 From: Mark Johnston Date: Tue, 18 Jan 2022 10:42:21 -0500 Subject: [PATCH] fork: Copy the vm_stacktop field into the new vmspace Fixes: 1811c1e957ee ("exec: Reimplement stack address randomization") Reported by: pho Reported by: syzbot+0446312a51bc13ead834@syzkaller.appspotmail.com Sponsored by: The FreeBSD Foundation --- sys/vm/vm_map.c | 1 + 1 file changed, 1 insertion(+) diff --git a/sys/vm/vm_map.c b/sys/vm/vm_map.c index 98d3d1e5bb1..8d654f5ac61 100644 --- a/sys/vm/vm_map.c +++ b/sys/vm/vm_map.c @@ -4263,6 +4263,7 @@ vmspace_fork(struct vmspace *vm1, vm_ooffset_t *fork_charge) vm2->vm_taddr = vm1->vm_taddr; vm2->vm_daddr = vm1->vm_daddr; vm2->vm_maxsaddr = vm1->vm_maxsaddr; + vm2->vm_stacktop = vm1->vm_stacktop; vm_map_lock(old_map); if (old_map->busy) vm_map_wait_busy(old_map);