bug#27429: Stack clash (CVE-2017-1000366 etc)

[Leo Famulari]

I'm currently testing the patch for CVE-2017-1000369 in Exim:

https://git.exim.org/exim.git/commit/65e061b76867a9ea7aeeb535341b790b90ae6c21

"To reach the start of the stack with the end of the heap (man brk), we
permanently leak memory through multiple -p command-line arguments that
are malloc()ated by Exim but never free()d (CVE-2017-1000369) -- we call
such a malloc()ated chunk of heap memory a "memleak-chunk"."

https://www.qualys.com/2017/06/19/stack-clash/stack-clash.txt

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