ip_defrag.sh in net from ubuntu_kernel_selftests failed with exit code 255 on F-oem-5.6

[Po-Hsu Lin]

[Impact]
The ip_defrag.sh test in net from kernel-selftest failed with exit
code 255:
 # selftests: net: ip_defrag.sh
 not ok 18 selftests: net: ip_defrag.sh # exit=255

[Fix]
* aba69d49fb49c9 ("selftests: net: ip_defrag: modprobe missing
nf_defrag_ipv6 support")

This patch can be cherry-picked into OEM-5.6

[Test Case]
Run this script after building the net test in kselftest directory
(linux/tools/testing/selftests) from the kernel tree:
 make TARGETS=net
 cd net
 sudo ./ip_defrag.sh

With this patch applied the test will pass without any issue.

[Where problems could occur]
Change limited to the test case only. And this has already included
in other kernels, it's unlikely to cause problems.

[Original Bug Report]
Issue found on 5.6.0-1050.54 - oem

The ip_defrag.sh test failed with:
 # selftests: net: ip_defrag.sh
 not ok 18 selftests: net: ip_defrag.sh # exit=255

I don't think this can be called as a regression, since the ubuntu_kernel_selftests test was removed and added back to the test suite until the most recent cycle. And this issue can be reproduced with 5.6.0-1048-oem as well.

Note that we have another issue for this test filed against F-oem-5.6 in before, see bug 1908498
It looks like there are several changes after this test since then.

[Ubuntu Kernel Bot (ubuntu-kernel-bot)]

This bug is awaiting verification that the kernel in -proposed solves the problem. Please test the kernel and update this bug with the results. If the problem is solved, change the tag 'verification-needed-focal' to 'verification-done-focal'. If the problem still exists, change the tag 'verification-needed-focal' to 'verification-failed-focal'.

If verification is not done by 5 working days from today, this fix will be dropped from the source code, and this bug will be closed.

See https://wiki.ubuntu.com/Testing/EnableProposed for documentation how to enable and use -proposed. Thank you!

[Launchpad Janitor (janitor)]

This bug was fixed in the package linux-oem-5.6 - 5.6.0-1053.57

---------------
linux-oem-5.6 (5.6.0-1053.57) focal; urgency=medium

  * focal/linux-oem-5.6: 5.6.0-1053.57 -proposed tracker (LP: #1921042)

  * Packaging resync (LP: #1786013)
    - update dkms package versions

  * LRMv4: switch to signing nvidia modules via the Ubuntu Modules signing key
    (LP: #1918134)
    - [Packaging] sync dkms-build et al from LRMv4

  * CVE-2021-29154
    - SAUCE: bpf, x86: Validate computation of branch displacements for x86-64
    - SAUCE: bpf, x86: Validate computation of branch displacements for x86-32

  * xfrm_policy.sh in net from ubuntu_kernel_selftests passed with failed sub-
    cases (LP: #1909647)
    - selftests: xfrm: fix test return value override issue in xfrm_policy.sh

  * ip_defrag.sh in net from ubuntu_kernel_selftests failed with exit code 255
    on F-oem-5.6 (LP: #1919147)
    - selftests: net: ip_defrag: modprobe missing nf_defrag_ipv6 support

  * l2tp.sh from net in ubuntu_kernel_selftests cause dmesg flooded with
    "unregister_netdevice: waiting for eth0 to become free. Usage count = 1" on
    F-OEM-5.6 (LP: #1919277)
    - l2tp: remove skb_dst_set() from l2tp_xmit_skb()

  * CVE-2020-0466
    - epoll: Keep a reference on files added to the check list
    - do_epoll_ctl(): clean the failure exits up a bit
    - fix regression in "epoll: Keep a reference on files added to the check list"

  * CVE-2021-3178
    - nfsd4: readdirplus shouldn't return parent of export

  * CVE-2020-25285
    - mm/hugetlb: fix a race between hugetlb sysctl handlers

  * CVE-020-10781
    - Revert "zram: convert remaining CLASS_ATTR() to CLASS_ATTR_RO()"

  * CVE-2020-14351
    - perf/core: Fix race in the perf_mmap_close() function

  * CVE-2020-25669
    - Input: sunkbd - avoid use-after-free in teardown paths

  * CVE-2020-14390
    - fbcon: remove soft scrollback code

  * CVE-2021-3411
    - x86/kprobes: Fix optprobe to detect INT3 padding correctly

  * CVE-2020-0423
    - binder: fix UAF when releasing todo list

  * CVE-2020-27830
    - speakup: Reject setting the speakup line discipline outside of speakup

  * CVE-2020-0465
    - HID: core: Correctly handle ReportSize being zero
    - HID: core: Sanitize event code and type when mapping input

  * CVE-2020-25645
    - geneve: add transport ports in route lookup for geneve

  * CVE-2021-20194
    - bpf, cgroup: Fix optlen WARN_ON_ONCE toctou
    - bpf, cgroup: Fix problematic bounds check

  * CVE-2020-36158
    - mwifiex: Fix possible buffer overflows in mwifiex_cmd_802_11_ad_hoc_start

 -- Stefan Bader <email address hidden> Fri, 09 Apr 2021 16:43:44 +0200

[Po-Hsu Lin (cypressyew)]

$ sudo ./ip_defrag.sh
ipv4 defrag
seed = 1618386560
PASS
ipv4 defrag with overlaps
seed = 1618386560
PASS
ipv6 defrag
seed = 1618386567
PASS
ipv6 defrag with overlaps
seed = 1618386567
PASS
ipv6 nf_conntrack defrag
seed = 1618386571
PASS
ipv6 nf_conntrack defrag with overlaps
seed = 1618386571
PASS
all tests done
$ echo $?
0
$ uname -a
Linux moe 5.6.0-1053-oem #57-Ubuntu SMP Fri Apr 9 16:13:57 UTC 2021 x86_64 x86_64 x86_64 GNU/Linux