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43 lines
992 B
Markdown
43 lines
992 B
Markdown
# CmpLog instrumentation
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The CmpLog instrumentation enables the logging of the comparisons operands in a
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shared memory.
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These values can be used by various mutators built on top of it.
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At the moment we support the RedQueen mutator (input-2-state instructions only).
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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, with setting AFL_LLVM_CMPLOG 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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```
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## Use
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AFL++ has the new -c option that can be used to specify a CmpLog binary (the second
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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 to use -m none because CmpLog maps a lot of pages.
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