my Linux laptop started to have a problem of setting my home directory with
group write permission
$ ls -ld $HOMEdrwxr-x--- 34 user users 4096 Jan 30 21:45 /home/user
to:
$ ls -ld $HOMEdrwxrwx--- 34 user users 4096 Jan 30 21:45 /home/user
This usually doesn't cause a problem but since recently it started settings
group write on servers as well which I did ssh login; and once logout, the next
time it doesn't allow re-login from server side sshd audit logs, says because
of group write permission is set it doesn't allow my account to login;
this wired problem has started settings multiple ssh servers, either at home
Linux server, or Linux server in the cloud,but it isn't always reproducible, in
past 30 days it happened 3 times to 4 different servers
I suspect current Linux laptop has a software virus or something because it has
been in use for 2 years; I re-installed the laptop with latest Fedora 27 and
all started as fresh, but 2 weeks later right now, the group write permission
is set again to one of my servers;
I checked all bash_history and system logs, didn't see any explicit bash call
of "chmod g+w ..." ; so I suspect some software is calling by chmod syscall,
so I wonder anyone knows how to set a system wide chmod audit? and if a whole
hard drive anti-virus scan is necessary, which anti-virus scan software do you
recommend?
It's weird that nothing worse than a group write permission set. No damage to
system, no malfunctioning. The newly installed Linux system just functions
perfect if without that.But I am kind of pretty sure it's this laptop, because
whenever this laptop is down time, I use another newer laptop I bought a few
months ago, nothing bad happens yet during this current 3years old laptop
downtime.
Thanks;
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