Chown, chgrp - how to fix the problem?

Question

linux

Good afternoon, such a problem, I can not understand why this is happening?
first terminal
[[email protected] ~]$ touch file1
[[email protected] ~]$ ls -l
total 0
-rw-rw-r--. 1 user2 user2 0 Nov 25 02:14 file1
[[email protected] ~]$ chgrp user3 file1
chgrp: changing group of `file1': Operation not permitted
[[email protected] ~]$ chown user3 file1
chown: changing ownership of `file1': Operation not permitted
[[email protected] ~]$ ls -l file1
-rw-rw-r--. 1 user2 user2 0 Nov 25 02:14 file1
[[email protected] ~]$
and on the second terminal:
[[email protected] ~]$ touch file2
[[email protected] ~]$ ls -l file2
-rw-rw-r--. 1 user3 user3 0 Nov 25 02:15 file2
[[email protected] ~]$ chgrp user2 file2
[[email protected] ~]$ chown user2 file2
chown: changing ownership of `file2': Operation not permitted
[[email protected] ~]$ ls -l file2
-rw-rw-r--. 1 user3 user2 0 Nov 25 02:15 file2
1. I can't understand why one can change the group of a file and the other does not?
2. for some reason, chown stopped working, being the owner cannot give the file to another

Answer 1

I can’t understand why one gets to change the group of a file and the other doesn’t?

An ordinary user can only change the group of a file he owns to one of the groups he belongs to. user3 is a member of user2 group? And vice versa?
A normal user cannot change the owner of a file, even for files he owns.
All this and much more can be found in man 2 chown

Answer 2

Comparison of the rights to the chown, chgrp binaries on both servers, there is a suspicion that SUIDs can be affixed https://ru.wikipedia.org/wiki/Suid#setuid_.D0.B8_s...