Comment 0 for bug 1809704

The open(O_WRONLY) test in test_create_read failed with premission denied.
This issue can be reproduced with upstream kernel tree on Xenial as well.

$ sudo make -C linux/tools/testing/selftests TARGETS=efivarfs run_tests
make: Entering directory '/home/ubuntu/autotest/client/tmp/ubuntu_kernel_selftests/src/linux/tools/testing/selftests'
for TARGET in efivarfs; do \
 make -C $TARGET; \
done;
make[1]: Entering directory '/home/ubuntu/autotest/client/tmp/ubuntu_kernel_selftests/src/linux/tools/testing/selftests/efivarfs'
make[1]: Nothing to be done for 'all'.
make[1]: Leaving directory '/home/ubuntu/autotest/client/tmp/ubuntu_kernel_selftests/src/linux/tools/testing/selftests/efivarfs'
for TARGET in efivarfs; do \
 make -C $TARGET run_tests; \
done;
make[1]: Entering directory '/home/ubuntu/autotest/client/tmp/ubuntu_kernel_selftests/src/linux/tools/testing/selftests/efivarfs'
--------------------
running test_create
--------------------
./efivarfs.sh: line 48: /sys/firmware/efi/efivars/test_create-210be57c-9849-4fc7-a635-e6382d1aec27: Permission denied
  [PASS]
--------------------
running test_create_empty
--------------------
./efivarfs.sh: line 65: /sys/firmware/efi/efivars/test_create_empty-210be57c-9849-4fc7-a635-e6382d1aec27: Permission denied
  [PASS]
--------------------
running test_create_read
--------------------
open(O_WRONLY): Permission denied
  [FAIL]
--------------------
running test_delete
--------------------
  [PASS]
--------------------
running test_zero_size_delete
--------------------
  [PASS]
--------------------
running test_open_unlink
--------------------
  [PASS]
--------------------
running test_valid_filenames
--------------------
  [PASS]
--------------------
running test_invalid_filenames
--------------------
  [PASS]
selftests: efivarfs.sh [FAIL]
make[1]: Leaving directory '/home/ubuntu/autotest/client/tmp/ubuntu_kernel_selftests/src/linux/tools/testing/selftests/efivarfs'
make: Leaving directory '/home/ubuntu/autotest/client/tmp/ubuntu_kernel_selftests/src/linux/tools/testing/selftests'

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: linux-image-4.4.0-141-generic 4.4.0-141.167
ProcVersionSignature: User Name 4.4.0-141.167-generic 4.4.162
Uname: Linux 4.4.0-141-generic x86_64
AlsaDevices:
 total 0
 crw-rw---- 1 root audio 116, 1 Dec 24 05:10 seq
 crw-rw---- 1 root audio 116, 33 Dec 24 05:10 timer
AplayDevices: Error: [Errno 2] No such file or directory: 'aplay'
ApportVersion: 2.20.1-0ubuntu2.18
Architecture: amd64
ArecordDevices: Error: [Errno 2] No such file or directory: 'arecord'
AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/seq', '/dev/snd/timer'] failed with exit code 1:
CurrentDmesg:
 [92859.670497] smpboot: CPU 111 is now offline
 [92859.723040] kvm: disabled by bios
 [92859.750562] smpboot: Booting Node 1 Processor 111 APIC 0x7d
 [92859.821706] kvm: disabled by bios
Date: Tue Dec 25 06:30:01 2018
IwConfig: Error: [Errno 2] No such file or directory: 'iwconfig'
Lsusb:
 Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
 Bus 001 Device 003: ID 0b1f:03e9 Insyde Software Corp.
 Bus 001 Device 002: ID 0000:0001
 Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
MachineType: Intel Corporation S2600WFT
PciMultimedia:

ProcFB: 0 astdrmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.4.0-141-generic.efi.signed root=UUID=e93f24ed-4e90-4ccb-ba6d-f3b97fe0436f ro console=ttyS0,115200n8
RelatedPackageVersions:
 linux-restricted-modules-4.4.0-141-generic N/A
 linux-backports-modules-4.4.0-141-generic N/A
 linux-firmware 1.157.21
RfKill: Error: [Errno 2] No such file or directory: 'rfkill'
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 11/29/2016
dmi.bios.vendor: Intel Corporation
dmi.bios.version: SE5C620.86B.01.00.0336.112920161700
dmi.board.asset.tag: Base Board Asset Tag
dmi.board.name: S2600WFT
dmi.board.vendor: Intel Corporation
dmi.board.version: H48104-410
dmi.chassis.asset.tag: ....................
dmi.chassis.type: 23
dmi.chassis.vendor: ...............................
dmi.chassis.version: ..................
dmi.modalias: dmi:bvnIntelCorporation:bvrSE5C620.86B.01.00.0336.112920161700:bd11/29/2016:svnIntelCorporation:pnS2600WFT:pvr....................:rvnIntelCorporation:rnS2600WFT:rvrH48104-410:cvn...............................:ct23:cvr..................:
dmi.product.name: S2600WFT
dmi.product.version: ....................
dmi.sys.vendor: Intel Corporation