[Bug 21573] Need heap overrun detection at beginning of buffers, too

http://bugs.winehq.org/show_bug.cgi?id=21573

--- Comment #1 from Dan Kegel   2010-02-01 17:08:27 ---
Created an attachment (id=26017)
 --> (http://bugs.winehq.org/attachment.cgi?id=26017)
rough draft - add redzone at beginning of allocations

Here's a quick unfinished draft of how one might go
about adding this.  I got as far as making space for
the redzone, but didn't fill it or tell valgrind about it,
but it's not quite correct.