cem 0b0915c1b6 libc glob: Avoid pathological exponential behavior
Adapt glob's match() routine to use a greedy algorithm that avoids
exponential runtime in byzantine inputs.

While here, add a testcase for the byzantine input.

Prompted by:	https://research.swtch.com/glob
Authored by:	Yves Orton <demerphq at gmail.com>
Obtained from:	Perl (33252c318625f3c6c89b816ee88481940e3e6f95)
Sponsored by:	Dell EMC Isilon
2017-05-03 15:55:29 +00:00
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