[Bug libc/12518] memcpy acts randomly (and differently) with overlapping areas

["felipe.contreras at gmail dot com" <sourceware-bugzilla at sourceware dot org>]

http://sourceware.org/bugzilla/show_bug.cgi?id=12518

Felipe Contreras <felipe.contreras at gmail dot com> changed:

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--- Comment #25 from Felipe Contreras <felipe.contreras at gmail dot com> 2011-04-10 15:49:59 UTC ---
Created attachment 5660
  --> http://sourceware.org/bugzilla/attachment.cgi?id=5660
Patch to check for overlaps

Actually the code from Linus had a bug in the 'cmp' checks, here's the updated
version.

I just started to run my Fedora system with this, and I already see crashes in
pulseaudio and readahead-collector. I will continue running this for a bit, but
I think it's pretty clear that we should not assume that all applications in a
typical system have been using memcpy properly.

So, again, I think we need at least a transition period so that people can
detect and fix the issues.

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