[Bug runtime/14245] New: Support debugfs mounted 0700

[jistone at redhat dot com]

http://sourceware.org/bugzilla/show_bug.cgi?id=14245

             Bug #: 14245
           Summary: Support debugfs mounted 0700
           Product: systemtap
           Version: unspecified
            Status: NEW
          Severity: enhancement
          Priority: P2
         Component: runtime
        AssignedTo: systemtap@sourceware.org
        ReportedBy: jistone@redhat.com
    Classification: Unclassified


Related to bug #14244, it would be nice we could support non-root users running
on systems with mode 0700 debugfs.  Apparently Ubuntu has started defaulting
this way.  See again this thread:
http://sourceware.org/ml/systemtap/2012-q2/msg00243.html

There I briefly started brainstorming what would be needed, "We could open the
directory in staprun and do the access check with faccessat().  Then we'd have
to also pass a control_channel fd across the exec to stapio, since it can't
open that path itself."

This will require a good dose of security-conscious caution.

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