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Dominik Maier 2021-02-26 11:45:30 +01:00
parent 15a64c3e17
commit 4c392de98d
2 changed files with 7 additions and 4 deletions
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5
fuzzers/libfuzzer_libpng/README.md
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@ -1,6 +1,7 @@
# Libfuzzer for libpng # Libfuzzer for libpng
This folder contains an example fuzzer for libpng, using LLMP for fast multi-process fuzzing and crash detection. This folder contains an example fuzzer for libpng, using LLMP for fast multi-process fuzzing and crash detection.
To show off crash detection, we added a ud2 instruction to the harness, edit harness.cc if you want a non-crashing example.
It has been tested on Linux. It has been tested on Linux.
## Build ## Build
@ -19,4 +20,6 @@ As this example uses in-process fuzzing, we added a Restarting Event Manager (`s
This means each client will start itself again to listen for crashes and timeouts. This means each client will start itself again to listen for crashes and timeouts.
By restarting the actual fuzzer, it can recover from these exit conditions. By restarting the actual fuzzer, it can recover from these exit conditions.
For convenience, you may just run `./test.sh` in this folder. In any real-world scenario, you should use `taskset` to pin each client to an empty cpu core, the lib does not pick an empty core automatically (yet).
For convenience, you may just run `./test.sh` in this folder to test it.

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fuzzers/libfuzzer_libpng/test.sh
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@ -6,12 +6,12 @@ cargo build --example libfuzzer_libpng --release || exit 1
cp ../../target/release/examples/libfuzzer_libpng ./.libfuzzer_test.elf cp ../../target/release/examples/libfuzzer_libpng ./.libfuzzer_test.elf
# The broker # The broker
RUST_BACKTRACE=full ./.libfuzzer_test.elf & RUST_BACKTRACE=full taskset 0 ./.libfuzzer_test.elf &
# Give the broker time to spawn # Give the broker time to spawn
sleep 2 sleep 2
echo "Spawning client" echo "Spawning client"
# The 1st fuzzer client # The 1st fuzzer client, pin to cpu 0x1
RUST_BACKTRACE=full ./.libfuzzer_test.elf 2>/dev/null RUST_BACKTRACE=full taskset 1 ./.libfuzzer_test.elf 2>/dev/null
killall .libfuzzer_test.elf killall .libfuzzer_test.elf
rm -rf ./.libfuzzer_test.elf rm -rf ./.libfuzzer_test.elf