hwclock and audit system

[Alexander Dalloz]

Am Fr, den 29.07.2005 schrieb Berna Massingill um 21:53:

> >>  > > hwclock --show | cat
> >>  > >
> >>  > > Does that help?
> 
> It did for me (newly-installed FC4 system on Dell Dimension,
> hwclock from util-linux-2.12p-9.5).
> 
> I notice also that:
> 
> (*) hwclock produces output if run from one of the virtual text
> consoles, but not if run from an xterm (unless piped to another
> command, as you describe above).
> 
> (*) /sbin/hwclock does not produce output, but if I copy /sbin/hwclock
> to, say, /root/hwclock, /root/hwclock produces output.  
> 
> (*) If run as /sbin/hwclock, strace output indicates that the program
> makes a call to ioctl, which works in a text console but not in an
> xterm.  If run as /root/hwclock, it doesn't make that call, and all
> is well.

Interesting. Maybe one of the SELinux gurus is willing to jump in an
enlighten us mortals.

> >>  > No change.  Why do you think it would?
> 
> I'm interested in the explanation as well -- why piping the output
> to another command makes a difference.  A colleague also says "ask
> him whether he found this by accident or whether he knew it would
> work because of some deep understanding ...."  So -- ?

Fair question. I "know" it from

https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=150153

> >>  http://fedora.redhat.com/docs/release-notes/fc4/errata/#sn-overview
> >>  
> >>  hwclock is in the list of daemons covered by the targeted policy. This
> >>  means hwclock may or may not have control over the terminal. 
> 
> Would I be right in guessing that this explains why putting the
> executable in a different directory changes the results??
> 
> >>  Though it
> >>  seems this issue is a different one (on the German speaking Fedora list
> >>  the cat pipe helped recently[1]).
> >>  
> >>  Alexander
> >>  
> >>  [1]
> >>  https://www.redhat.com/archives/fedora-de-list/2005-June/msg00109.html
> 
> If only I read German!

Should have been just a reference, as the thread too shows a strace
output.

> -- blm

Alexander


-- 
Alexander Dalloz | Enger, Germany | GPG http://pgp.mit.edu 0xB366A773
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