HomeFreeBSD

vm_fault_copy_entry: accept invalid source pages.

Description

vm_fault_copy_entry: accept invalid source pages.

Either msync(MS_INVALIDATE) or the object unlock during vnode
truncation can expose invalid pages backing wired entries. Accept
them, but do not install them into destrination pmap. We must create
copied pages in the copy case, because e.g. vm_object_unwire() expects
that the entry is fully backed.

Reported by: syzkaller, via emaste
Reported by: syzbot+514d40ce757a3f8b15bc@syzkaller.appspotmail.com
Reviewed by: markj
Tested by: pho
Sponsored by: The FreeBSD Foundation
MFC after: 1 week
Differential revision: https://reviews.freebsd.org/D19615

Details

Committed
kibMar 20 2019, 1:07 PM
Reviewer
markj
Differential Revision
D19615: vm_fault_copy_entry: accept invalid source pages.
Parents
rS345323: netmap: update unit tests
Branches
Unknown
Tags
Unknown