Bug 1218137

Description:

The issue is seen from build 41.1, seems something changed for default permission for /dev/hvc0. so far I can only see this issue on xen PV vm.

After system installation, I can see below file permission for /dev/hvc0:

# ll /dev/hvc0
crw------- 1 root tty 229, 0 Dec 17 23:46 /dev/hvc0

Then non root user [in openQA test, we use user [sshboy] to access /dev/hvc0] can not access /dev/hvc0. even we have add the user to GROUP.

"usermod -aG root sshboy"

However, with beta1 [39.1/40.1] build. I can see the file has permission 0640:
# ll /dev/hvc0
crw--w---- 1 root tty 229, 0 Dec 17 23:47 /dev/hvc0


One more interesting thing is that, on build 45.1, the permission will change to 0640 after I restart the service: [or shutdown the vm and start it again. reboot VM will not change the permission from my test]

# systemctl restart serial-getty@hvc0.service 
# ll /dev/hvc0
crw--w---- 1 root tty 229, 0 Dec 17 23:47 /dev/hvc0

# systemctl is-enabled serial-getty@hvc0.service 
enabled-runtime
**********************************************************

openQA result as below:
## Observation

openQA test in scenario sle-15-SP6-Online-x86_64-extra_tests_textmode@svirt-xen-pv fails in
[sshd](https://openqa.suse.de/tests/13085653/modules/sshd/steps/39)

## Test suite description
Maintainer: QE Core, asmorodskyi,dheidler. Mainly console extratest 


## Reproducible

Fails since (at least) Build [39.1](https://openqa.suse.de/tests/12838045)


## Expected result

Last good: (unknown) (or more recent)


## Further details

Always latest result in this scenario: [latest](https://openqa.suse.de/tests/latest?arch=x86_64&distri=sle&flavor=Online&machine=svirt-xen-pv&test=extra_tests_textmode&version=15-SP6)