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Re: [ft-devel] More fuzzing for freetype2?


From: Werner LEMBERG
Subject: Re: [ft-devel] More fuzzing for freetype2?
Date: Wed, 07 Oct 2015 10:18:50 +0200 (CEST)

> I've inserted this file into the corpus, and it added 2 more control flow
> edges (out of ~15000).
> Not much, but not zero.

The current function used for the fuzzer doesn't cover GX stuff at
all.  We have to extend it step by step to get a better FreeType
coverage.

> The current target function handles any kind of font, so it may be
> rather slow in finding problems specific to a single font type.  For
> that we better write a separate target function. Would you like to
> help?

Yes, this would be great!  Have a look into the `ftmulti' FreeType
demo program :-) If you want to test named instances only, a simpler
approach of looping over all faces might work also with the recent
2.6.1 version (we have to add to test TTC support anyways to the
fuzzing routine).


    Werner



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