[Bug runtime/9937] verify user-space build-ids

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

http://sourceware.org/bugzilla/show_bug.cgi?id=9937

Frank Ch. Eigler <fche at redhat dot com> changed:

           What    |Removed                     |Added
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         AssignedTo|systemtap at sources dot    |scox at redhat dot com
                   |redhat.com                  |

--- Comment #19 from Frank Ch. Eigler <fche at redhat dot com> 2010-10-23 15:29:39 UTC ---
Looks like a good start.
A few problems:

The probe_kernel_* alternative is based on an autoconf macro
to determine the presence of the probe_kernel_* functions,
*not* whether we're trying to check a kernel- or user-space
build-id string.

I don't understand why the dwfl_module_getdwarf / dwarf_module_base
stuff is at all relevant here.  The build-id is not debuginfo
based.  It's as if you're adding then subtracting the same dwbias
value, to no effect at all.

Instead, the code should reuse/extend the explicit
dwfl_module_relocation_info* calculations as used for
kernel modules up near line 4895, which I see it's trying
to do (though the comments need to be expanded to explain).
It needs to respect/store the secname instead of just bypassing
the .note.gnu.build-id assertion (which is correct only for
kernel modules).

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