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45 lines
1.1 KiB
Markdown
45 lines
1.1 KiB
Markdown
# CmpLog instrumentation
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The CmpLog instrumentation enables logging of comparison operands in a shared
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memory.
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These values can be used by various mutators built on top of it. At the moment,
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we support the Redqueen mutator (input-2-state instructions only), for details
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see [the Redqueen paper](https://github.com/RUB-SysSec/redqueen).
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## Build
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To use CmpLog, you have to build two versions of the instrumented target
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program:
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* The first version is built using the regular AFL++ instrumentation.
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* The second one, the CmpLog binary, is built with setting `AFL_LLVM_CMPLOG`
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during the compilation.
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For example:
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```
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./configure --cc=~/path/to/afl-clang-fast
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make
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cp ./program ./program.afl
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make clean
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export AFL_LLVM_CMPLOG=1
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./configure --cc=~/path/to/afl-clang-fast
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make
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cp ./program ./program.cmplog
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unset AFL_LLVM_CMPLOG
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```
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## Use
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AFL++ has the new `-c` option that needs to be used to specify the CmpLog binary
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(the second build).
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For example:
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```
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afl-fuzz -i input -o output -c ./program.cmplog -m none -- ./program.afl @@
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```
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Be careful with the usage of `-m` because CmpLog can map a lot of pages.
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