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fork: Copy the vm_stacktop field into the new vmspace

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Fixes:	1811c1e957 ("exec: Reimplement stack address randomization")
Reported by:	pho
Reported by:	syzbot+0446312a51bc13ead834@syzkaller.appspotmail.com
Sponsored by:	The FreeBSD Foundation
This commit is contained in:
Mark Johnston 2022-01-18 10:42:21 -05:00
parent 5eb81a4b40
commit 46d35d415a
1 changed files with 1 additions and 0 deletions
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sys/vm/vm_map.c
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@ -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);