[Bug runtime/6030] stap, staprun, stapio interaction quirks: stale module left unloaded

["ananth at in dot ibm dot com" <sourceware-bugzilla at sourceware dot org>]

------- Additional Comments From ananth at in dot ibm dot com  2008-04-08 12:57 -------
Subject: Re:  stap, staprun, stapio interaction quirks:
	stale module left unloaded

On Fri, Apr 04, 2008 at 03:43:15PM -0000, hunt at redhat dot com wrote:
> 
> "I think a simpler, more secure approach would be to simply separate the
> module removal and build it as a standalone suid program.  It would
> check the user was in stapusr or stapdev, verify the module that was
> requested to be unloaded was a systemtap module, then unload it.  That
> allows staprun to do some quick setup, load the module, then drop all
> capabilities (if we use them), fork stapio, and exit. Stapio would exec
> the module unloader when it got ^C or an exit message from the module."
> 
> So staprun goes away and cannot be killed. SIGKILL on stapio would still
> leave the module installed, of course. So then you would run the
> unloader by hand. What would we call it? staprm?  Or it could just be
> staprun with a flag to unload instead of load.

Yes, this sounds like a simpler solution.


-- 


http://sourceware.org/bugzilla/show_bug.cgi?id=6030

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