On Fri, 24 Mar 2023 12:28:07 +0800 Shiyang Ruan <ruansy.fnst@xxxxxxxxxxx> wrote: > > ie it's the data that was in whatever file happened to use that space > > last, so this is a security bug because it's a data leak, and a backport > > is needed, and you should have indicated that by putting a cc: stable > > tag on the patch? > > Yes, cc stable is needed. Then should I send a new patch with the tag > added? Thanks. I updated the changelog and added cc:stable. : unshare copies data from source to destination. But if the source is : HOLE or UNWRITTEN extents, we should zero the destination, otherwise : the HOLE or UNWRITTEN part will be user-visible old data of the new : allocated extent because it wasn't cleared. : : Found by running generic/649 while mounting with -o dax=always on pmem.
