rm: cannot unlink `sendmail': Operation not permitted

["Jason Lim" <maillist@jasonlim.com>]

Hi all,

This is happening on a Redhat 7.2 system, but i think it would apply
across all Linux distros.

[root@linux1 sbin]# pwd
/usr/sbin
[root@linux1 sbin]# chattr -iu sendmail
[root@linux1 sbin]# rm sendmail
rm: remove `sendmail'? y
rm: cannot unlink `sendmail': Operation not permitted

[root@linux1 sbin]# ls -al sendmail
-rwxr-xr-x   1 root     root        99161 May  1 01:21 sendmail

That is happening for all the files in that directory.

strace rm sendmail:

lstat64("sendmail", {st_mode=S_IFREG|0755, st_size=99161, ...}) = 0
access("sendmail", W_OK)                = 0
unlink("sendmail")                      = -1 EPERM (Operation not
permitted)


Any ideas as to what may be happening?

Sincerely,
Jason


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