[Bug dynamic-link/30127] [rfe]: enable ld audit at run-time

["fweimer at redhat dot com" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=30127

--- Comment #10 from Florian Weimer <fweimer at redhat dot com> ---
I think for experimentation, you can use the link map as a dlopen handle
directly, and pass it to dlsym, for example.

We need to gather consensus that this is the way to do it, and document it.
Presently, it's an undocumented implementation detail.

We also need to use a dedicated link map allocator which only reuses, but not
frees, the underlying storiage, so that it becomes safe to traverse the
_r_debug lists, despite concurrent dlopen/dlcose operation.

There should also be a way to obtain a stable handle from a link map pointer.
Using dlopen with RTLD_NOLOAD seems about right for that. Maybe we should
maintain a hash table with the l_name pointers (not the strings), so that we
can precisely identify the link map from its l_name member, even if the name is
not unique or concurrently overwritten.

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