Re: [gentoo-user] Root can't write to files owned by others?

[Peter Böhm]

Rainer,

using sudo does not makes you a root user. To become a root user you have to 
switch with "su -" (and login with root password).

Sudo has its own configuration file. If you can do something with sudo on other 
systems means there is a different configuration for sudo.

Check "man sudo"

Cheers,
Peter


Am Mittwoch, 9. März 2022, 19:28:49 CET schrieb Dr Rainer Woitok:
> Greetings,
>
> until recently my system behaves sort of strangely:
>
>    $ touch /tmp/file
>    $ ls -l /tmp/file
>    -rw------- 1 rainer rainer 0 2022-03-09 19:06 /tmp/file
>    $ echo x | sudo tee /tmp/file
>    Password:
>    tee: /tmp/file: Permission denied
>    x
>    $ chmod a+w /tmp/file
>    $ ls -l /tmp/file
>    -rw--w--w- 1 rainer rainer 0 2022-03-09 19:06 /tmp/file
>    $ echo x | sudo tee /tmp/file
>    tee: /tmp/file: Permission denied
>    x
>    $
>
> Since when can't root write to files  it doesn't own?   And not even, if
> the file has write permission for everybody?
>
> This worked as long as I can think of.  My last routine upgrade install-
> ed new  kernel package  "sys-kernel/gentoo-sources-5.15.26",  so I built
> the new kernel and booted from it.  May this be the reason?
>
> When I'll have time to reboot,  I'll test the  above commands  on my old
> kernel, 5.15.19.  But perhaps there's another reason?
>
> Slightly puzzled
>      Rainer