Does the filesystem alter file permissions?

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I'm getting very weird results when creating new files on ext4 
filesystems (this is on a CentOS 7 system).  The permissions are not 
what they should be.

On the / filesystem, as superuser:

[root@server ~]# umask
0000
[root@server ~]# touch a
[root@server ~]# ls -l a
-r--r----- 1 root root 0 Oct 10 11:45 a

As a normal user:

[stern@server ~]$ umask
0000
[stern@server ~]$ touch b
[stern@server ~]$ ls -l b
-rw------- 1 stern stern 0 Oct 10 11:47 b

In /boot (which is a separate ext4 filesystem):

[root@server boot]# umask
0000
[root@server boot]# touch a
[root@server boot]# ls -l a
-r--r--r--. 1 root root 0 Oct 10 15:30 a

On a tmpfs filesystem, the permissions are -rw-rw-rw-, as expected.

What causes this sort of thing, and how can I change it?

Thanks,

Alan Stern

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