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Variable splitting #5

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@romainthomas romainthomas commented Feb 21, 2015

Voici le début de ma contribution sur l'obfuscation : "Variable splitting". La passe marche avec des codes très simples (tests/ObfuscateVar/basic.c) et il y a encore un grand nombre d'ameliorations que je dois faire sur la structure de la passe et ses fonctionnalités.

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nouveau fichier : .gitignore
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	nouveau fichier : CMakeLists.txt
	nouveau fichier : cmake/Python.cmake
	nouveau fichier : llvm-passes/CMakeLists.txt
	nouveau fichier : llvm-passes/ObfuscateVar/ObfuscateVar.cpp
	nouveau fichier : llvm-passes/ObfuscateZero/ObfuscateZero.cpp
	nouveau fichier : tests/ObfuscateVar/basic.c
	nouveau fichier : tests/ObfuscateZero/basic_test.c
	nouveau fichier : tests/ObfuscateZero/check_openssl.sh
	nouveau fichier : tests/ObfuscateZero/check_zlib.sh
	nouveau fichier : tests/ObfuscateZero/null_pointer_test.c
	nouveau fichier : tests/ObfuscateZero/test_gep.c
	nouveau fichier : tests/ObfuscateZero/test_maxint.cpp
	nouveau fichier : tests/lit.cfg.in
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modifié : .gitignore
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	supprimé :        cmake/Python.cmake
@romainthomas
nouveau fichier : cmake/Python.cmake
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serge-sans-paille commented Feb 25, 2015

I'll have a look at this tomorrow morning!

serge-sans-paille
serge-sans-paille reviewed Feb 26, 2015
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@serge-sans-paille serge-sans-paille Feb 26, 2015

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Why not, but this is specific to your configuration, so I would not add this entry (e.g. I a generally using _build, or _fastbuild etc, should we list all of them here?)

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serge-sans-paille reviewed Mar 17, 2015
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@serge-sans-paille serge-sans-paille Mar 17, 2015

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Why did you delete the LiCENSE?

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serge-sans-paille commented Mar 17, 2015

There are two big issues in your PR 👍
1/ the commit is not atomic (there should be a single commit, nobody cares about your private things ;-))
2/ Your transformation algorithm is not correct. What you should do is start with an empty value_map, then fill it with the converted values of the function arguments when it's legal (i.e. integer type), then process each instruction. For each instruction if it's an add and the operands have been transformed (or are constants), then replace it by the splitted operation and store a new binding in your valuemap. If it's an illegal operation, for each operand that has a splitted value, unsplit it and replace the value.

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@romainthomas @serge-sans-paille