[Bug 1812620] Re: msg_zerocopy.sh in net from ubuntu_kernel_selftests failed

This bug was fixed in the package linux-hwe - 5.3.0-68.63

---------------
linux-hwe (5.3.0-68.63) bionic; urgency=medium

* CVE-2020-16119
- SAUCE: dccp: avoid double free of ccid on child socket

* CVE-2020-16120
- Revert "UBUNTU: SAUCE: overlayfs: ensure mounter privileges when reading
directories"
- ovl: pass correct flags for opening real directory
- ovl: switch to mounter creds in readdir
- ovl: verify permissions in ovl_path_open()
- ovl: call secutiry hook in ovl_real_ioctl()
- ovl: check permission to open real file

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

* Introduce the new NVIDIA 450-server and the 450 UDA series (LP: #1887674)
- [Packaging] hwe: Update nvidia driver versions

* Introduce the new NVIDIA 418-server and 440-server series, and update the
current NVIDIA drivers (LP: #1881137)
- [Packaging] hwe: Add build support for nvidia-server drivers

* msg_zerocopy.sh in net from ubuntu_kernel_selftests failed (LP: #1812620)
- selftests/net: relax cpu affinity requirement in msg_zerocopy test

* Fix false-negative return value for rtnetlink.sh in kselftests/net
(LP: #1890136)
- selftests: rtnetlink: correct the final return value for the test
- selftests: rtnetlink: make kci_test_encap() return sub-test result

-- Thadeu Lima de Souza Cascardo <cascardo@canonical.com> Mon, 28 Sep
2020 08:30:12 -0300

** Changed in: linux-hwe (Ubuntu Bionic)
Status: Fix Committed => Fix Released

** CVE added: https://cve.mitre.org/cgi-bin/cvename.cgi?name=2020-16119

** CVE added: https://cve.mitre.org/cgi-bin/cvename.cgi?name=2020-16120

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https://bugs.launchpad.net/bugs/1812620

Title:
msg_zerocopy.sh in net from ubuntu_kernel_selftests failed

Status in ubuntu-kernel-tests:
Fix Released
Status in linux package in Ubuntu:
Fix Released
Status in linux-hwe package in Ubuntu:
Invalid
Status in linux-hwe source package in Bionic:
Fix Released
Status in linux source package in Disco:
Won't Fix
Status in linux source package in Eoan:
Won't Fix
Status in linux source package in Focal:
Fix Released

Bug description:
== SRU Justification [ FOCAL ] ==

The msg_zerocopy.sh kernel self test will fail on machines that don't
have 2 or 3 CPUs such as 1 CPU cloud instances since the C test
program tries to set CPU affinity to CPUs 2 and 3 and bails out if it
fails.

== Fix ==

Upstream linux-next commit

commit 16f6458f2478b55e2b628797bc81a4455045c74e
Author: Willem de Bruijn <willemb@google.com>
Date: Wed Aug 5 04:40:45 2020 -0400

selftests/net: relax cpu affinity requirement in msg_zerocopy test

The fix now just emits a warning that CPU affinity can't be set rather
than cause an exit(1) termination.

== Test cast ==

Run the msg_zerocopy.sh test from the kernel net selftest on a 1 CPU
system. Without the fix the test fails. With the fix it runs
successfully as expected.

== Regression Potential ==

The original test pinned the CPUs for a benchmarking metric, for our
testing we are using this to test to see if the operations in the test
work successfully. There is a potential that users using this test
will not notice the warning if they are using this test as a benchmark
on a 1 CPU system and may get more jittery timing in their benchmarks
rather than a test failing and complaining they are not running it on
a suitable multi-CPU system. However, the likelyhood of a user using
this test on a single CPU system for benchmarking is small and as it
stands the test will now run and produce potentially jittery
benchmarks on a 1 CPU system compared to previously where it never
ran.

--------------------

This test will return 1

$ sudo ./msg_zerocopy.sh
ipv4 tcp -t 1
./msg_zerocopy: setaffinity 2
./msg_zerocopy: setaffinity 3
$ echo $?
1

ProblemType: Bug
DistroRelease: Ubuntu 18.10
Package: linux-image-4.18.0-13-generic 4.18.0-13.14
ProcVersionSignature: User Name 4.18.0-13.14-generic 4.18.17
Uname: Linux 4.18.0-13-generic x86_64
AlsaDevices:
 total 0
 crw-rw---- 1 root audio 116, 1 Jan 21 07:41 seq
 crw-rw---- 1 root audio 116, 33 Jan 21 07:41 timer
AplayDevices: Error: [Errno 2] No such file or directory: 'aplay': 'aplay'
ApportVersion: 2.20.10-0ubuntu13.1
Architecture: amd64
ArecordDevices: Error: [Errno 2] No such file or directory: 'arecord': 'arecord'
AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/seq', '/dev/snd/timer'] failed with exit code 1:
Date: Mon Jan 21 07:50:33 2019
IwConfig: Error: [Errno 2] No such file or directory: 'iwconfig': 'iwconfig'
Lsusb: Bus 001 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
MachineType: QEMU Standard PC (i440FX + PIIX, 1996)
PciMultimedia:

ProcFB: 0 cirrusdrmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.18.0-13-generic root=UUID=2a4b0342-a2dd-4feb-b3e2-9644ca1c4a60 ro console=ttyS0,115200n8
RelatedPackageVersions:
 linux-restricted-modules-4.18.0-13-generic N/A
 linux-backports-modules-4.18.0-13-generic N/A
 linux-firmware 1.175.1
RfKill: Error: [Errno 2] No such file or directory: 'rfkill': 'rfkill'
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 04/01/2014
dmi.bios.vendor: SeaBIOS
dmi.bios.version: Ubuntu-1.8.2-1ubuntu1
dmi.chassis.type: 1
dmi.chassis.vendor: QEMU
dmi.chassis.version: pc-i440fx-xenial
dmi.modalias: dmi:bvnSeaBIOS:bvrUbuntu-1.8.2-1ubuntu1:bd04/01/2014:svnQEMU:pnStandardPC(i440FX+PIIX,1996):pvrpc-i440fx-xenial:cvnQEMU:ct1:cvrpc-i440fx-xenial:
dmi.product.name: Standard PC (i440FX + PIIX, 1996)
dmi.product.version: pc-i440fx-xenial
dmi.sys.vendor: QEMU

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