[PATCH v3 0/2] xfstests: hexdump and CVE-2022-0847

[Zorro Lang <zlang@redhat.com>]

Thanks review points from Dave and Darrick. This patchset contains 2 patches:
[PATCH v3 1/2] xfstests: replace hexdump with od command
[PATCH v3 2/2] fstests: test dirty pipe vulnerability issue of CVE-2022-0847

[v3 1/2] Fix generic/404 failures on un-4k block size. Refer to:
https://lore.kernel.org/fstests/20220410171926.aanoxq2ybool5we5@zlang-mailbox/T/#u

[v3 2/2] Nothing changed

Thanks,
Zorro

== Messages from original V2 patch ==

[v2 1/2] did below changes:
1) Change g/404, remove od/hexdump command, generate md5 directly
2) Change g/042, remove -v option of od/hexdump
3) As Dave has given this V1 patch a "reviewed-by", so add it

[v2 2/2] did below changes:
1) remove _cleanup(), turn to use default _cleanup function
2) add "rm -f $localfile" before testing start

== Messages from original V1 patch ==
I've sent the V2 [2/2] last week[1], but due to the [2/2] hasn't been merged
and the [1/2] will affect [2/2]. So I send these two patches in one patchset
this time. Just please note, the [2/2] is the last version.

[1]
https://lore.kernel.org/fstests/20220320123932.1000005-1-zlang@redhat.com/