在 2023/3/24 6:11, Andrew Morton 写道:
On Thu, 23 Mar 2023 14:50:38 +0800 Shiyang Ruan <ruansy.fnst@xxxxxxxxxxx> wrote:
在 2023/3/23 7:03, Andrew Morton 写道:
On Wed, 22 Mar 2023 11:11:09 +0000 Shiyang Ruan <ruansy.fnst@xxxxxxxxxxx> wrote:
unshare copies data from source to destination. But if the source is
HOLE or UNWRITTEN extents, we should zero the destination, otherwise the
result will be unexpectable.
Please provide much more detail on the user-visible effects of the bug.
For example, are we leaking kernel memory contents to userspace?
This fixes fail of generic/649.
OK, but this doesn't really help. I'm trying to determine whether this
fix should be backported into -stable kernels and whether it should be
fast-tracked into Linus's current -rc tree.
But to determine this I (and others) need to know what effect the bug
has upon our users.
I didn't get any bug report form users. I just found this by running
xfstests. The phenomenon of this problem is: if we funshare a reflinked
file which contains HOLE extents, the result of the HOLE extents should
be zero but actually not (unexpectable data).
The other patch also has no reports from users.
--
Thanks,
Ruan.
