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

[fweimer at redhat dot com]

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

--- Comment #9 from Florian Weimer <fweimer at redhat dot com> ---
(In reply to Paul Pluzhnikov from comment #8)
> (In reply to Sergei Trofimovich from comment #7)
> 
> > This one looks like a scary use-after-free.
> 
> You are right. Bad example. Most of the real ones involve swap() with itself.

And GCC generates such memcpy calls, even for valid C code:

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=32667#c13

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