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Re: Sepcut Relabel problem

From: David Caplan <dac_at_tresys.com>
Date: Wed, 07 Apr 2004 12:17:42 -0400


Valdis.Kletnieks@vt.edu wrote:
> On Tue, 06 Apr 2004 16:31:12 PDT, Mark Shakespeare <mshakes@llnl.gov> said:
> 

>>--============_-1130828223==_ma============
>>Content-Type: text/plain; charset="us-ascii" ; format="flowed"
>>
>>Trying to relabel file system from within Sepcut ( most current version )
>>
>>getting a weird error....
>>
>>
>>couldn't open "/tmp/sepcut-zrqWs8Ew": no such file or directory
>>couldn't open "/tmp/sepcut-zrqWs8Ew": no such file or directory

>
> 
>>Sepcut hangs....then no other X-based apps can run. A reboot clears things.
>>
>>Any ideas?

>
>
> Seen in /etc/security/selinux/src/policy/Makefile:
>
> relabel: $(FC) $(SETFILES)
> @echo "Cleaning out /tmp"
> -rm -rf /tmp/.??* /tmp/*
>
> which is where your /tmp/sepcut-* and /tmp/.X11-unix/ went (the first
> explaining your sepcut error, the second explaining your X11 problem).
>
> I'll let somebody else address the question of whether that 'rm' command
> is over-zealous, as I'm not sure what it's trying to do. If it's trying to
> make sure there's no symlink attacks, it's going about it wrongly, as all
> that does is close down the race conditions a bit.
>
> Most likely, what it *should* be doing is a mkdir and working inside that
> directory for temp files.

The "rm" line appears to have been added relatively recently to the relabel target. My guess is that the rationale was that many of the files in /tmp were no longer labeled correctly after a relabel because most of them would have been created via a file transition rule (and thus a relabel would change them all to incorrect/default labels, most likely denying access to the files anyway if the system were in enforcing mode).

David 

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Received on Wed 7 Apr 2004 - 12:21:33 EDT
 

Date Posted: Jan 15, 2009 | Last Modified: Jan 15, 2009 | Last Reviewed: Jan 15, 2009

  
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