[Bug 216073] [s390x] kernel BUG at mm/usercopy.c:101! usercopy: Kernel memory exposure attempt detected from vmalloc 'n o area' (offset 0, size 1)!

[bugzilla-daemon@kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=216073

--- Comment #5 from Zorro Lang (zlang@redhat.com) ---
On Tue, Jun 07, 2022 at 05:05:01PM +0200, Alexander Gordeev wrote:
> On Mon, Jun 06, 2022 at 03:13:12PM -0700, Andrew Morton wrote:
> > (switched to email.  Please respond via emailed reply-to-all, not via the
> > bugzilla web interface).
> 
> Hi Zorro,
> 
> Unfortunately, I am not able to reproduce the issue. Could you please
> clarify your test environment details and share your xfstests config?

One of the test environment details as [1]. The xfstests config as [2].
It's easier to reproduce on 64k directory size xfs by running xfstests
auto group.

Thanks,
Zorro

[1]
CPU
Vendor  IBM/S390
Model Name      8561
Family  0
Model   3126312
Stepping        0
Speed   0.0
Processors      2
Cores   0
Sockets 0
Hyper   True
Flags   edat dfp vxp vx vxe ldisp sie vxe2 highgprs etf3eh te vxd gs sort zarch
msa stfle dflt eimm esan3
Arch(s) s390x

Memory  4096 MB
NUMA Nodes      1

Disks
Model   Size    Logical sector size     Physical sector size
3390/0c 41.03 GB / 38.21 GiB    4096 bytes      4096 bytes

[2]
# cat local.config
FSTYP=xfs
TEST_DEV=/dev/loop0
TEST_DIR=/mnt/fstests/TEST_DIR
SCRATCH_DEV=/dev/loop1
SCRATCH_MNT=/mnt/fstests/SCRATCH_DIR
LOGWRITES_DEV=/dev/loop2
MKFS_OPTIONS="-n size=65536 -m
crc=1,finobt=1,reflink=1,rmapbt=0,bigtime=1,inobtcount=1"
TEST_FS_MOUNT_OPTS=""

> 
> Thanks!
>

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