[Bug testsuite/20298] New: the unprivileged_embedded_C.exp testcase needs updating

["dsmith at redhat dot com" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=20298

            Bug ID: 20298
           Summary: the unprivileged_embedded_C.exp testcase needs
                    updating
           Product: systemtap
           Version: unspecified
            Status: NEW
          Severity: normal
          Priority: P2
         Component: testsuite
          Assignee: systemtap at sourceware dot org
          Reporter: dsmith at redhat dot com
  Target Milestone: ---

There are at least 2 problems I see with
testsuite/systemtap.stress/unprivileged_embedded_C.exp:

1) It only searches tapset functions in tapset/ and tapset/${ARCH}/. It doesn't
search tapsets in tapset/linux/ and tapset/linux/${ARCH}/. It needs to be
updated for the dyninst/linux tapset directory rearrangement.

2) It gets spurious failures. It assumes that if a tapset function doesn't have
any embedded C (i.e. a pure stap script function), a unprivileged user can call
it. That isn't the case if that pure stap script function calls a function that
is privileged.

For example, note the following 2 functions from tapset/linux/conversions.exp:

====
function kernel_string:string (addr:long) %{ /* pure */                         
 ...
%}

function kernel_string:string (addr:long, err_msg:string) {                     
  try { return kernel_string(addr) } catch { return err_msg }                   
}                                                                               

====

If unprivileged_embedded_C.exp tests the 2nd function above, it will think an
unprivileged user should be able to call it. However, since it calls the 1st
function which is privileged, the 2nd function is also privileged.

Since the testcase can't know what pure stap script functions should be
privileged or unprivileged, it should probably just skip testing them.

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