[Bug uprobes/10595] uprobe probes causes selinux failures

["jkenisto at us dot ibm dot com" <sourceware-bugzilla@sourceware.org>]

------- Additional Comments From jkenisto at us dot ibm dot com  2009-09-03 17:43 -------
(In reply to comment #2)
> It isn't return probe specific like I first thought.
> With both normal and return probes there is this hint in /var/log/messages:
> kernel: Uprobes failed to allocate a vma for pid/tgid 17519/17519 for
> single-stepping out of line.
> 
> The strange thing is that normal uprobes still seem to work, they trigger their
> handler as expected even though you get a selinux denial message, but return
> probes don't trigger.

When uprobes fails to create the vma, it falls back to single-stepping inline,
which doesn't require the vma.  We don't have a Plan B for uretprobes, though:
the only place we know to put the uretprobe trampoline is in slot 0 of our vma 
(There are, of course, alternatives, but they're not currently coded for.)

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http://sourceware.org/bugzilla/show_bug.cgi?id=10595

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