mirror of
https://github.com/AFLplusplus/AFLplusplus.git
synced 2025-06-18 12:48:06 +00:00
21 lines
754 B
Markdown
21 lines
754 B
Markdown
# AFL N-Gram Branch Coverage
|
|
|
|
## Source
|
|
|
|
This is an LLVM-based implementation of the n-gram branch coverage proposed in
|
|
the paper ["Be Sensitive and Collaborative: Analzying Impact of Coverage Metrics
|
|
in Greybox Fuzzing"](https://www.usenix.org/system/files/raid2019-wang-jinghan.pdf),
|
|
by Jinghan Wang, et. al.
|
|
|
|
Note that the original implementation (available
|
|
[here](https://github.com/bitsecurerlab/afl-sensitive))
|
|
is built on top of AFL's QEMU mode.
|
|
This is essentially a port that uses LLVM vectorized instructions to achieve
|
|
the same results when compiling source code.
|
|
|
|
## Usage
|
|
|
|
The size of `n` (i.e., the number of branches to remember) is an option
|
|
that is specified in the `AFL_LLVM_NGRAM_SIZE` environment variable.
|
|
Good values are 2, 4 or 8.
|