[Bug string/16004] memcpy/strcpy: detect memory overlap and crash when error is detected

["ppluzhnikov at google dot com" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=16004

Paul Pluzhnikov <ppluzhnikov at google dot com> changed:

           What    |Removed                     |Added
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                 CC|                            |ppluzhnikov at google dot com

--- Comment #5 from Paul Pluzhnikov <ppluzhnikov at google dot com> ---
FWIW, overlapping memcpy()ies are very common, and not always a "real" bug.
E.g.

    void *p = allocate_and_init (10);
    ...
    void *q = realloc(p, 20);  // q may or may not == p.
    memcpy(q, p, 10);

I've seen examples of "not a real bug" where p!=q as well.

While in theory these all should be fixed, in practice end users may not be in
a position to do so (e.g. prebuilt 3rd party library where the 3rd party
doesn't exist anymore, or isn't willing or able to provide a fixed version).

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