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Recommend setting AFL_FRAMESHIFT_DISABLE=1 #85

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Recommend setting AFL_FRAMESHIFT_DISABLE=1 #85

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1 change: 1 addition & 0 deletions README.md
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Expand Up @@ -65,6 +65,7 @@ printf '\x00' > /tmp/smite-seeds/empty
# Start fuzzing with the custom mutator
AFL_CUSTOM_MUTATOR_LIBRARY=target/release/libsmite_ir_mutator.so \
AFL_CUSTOM_MUTATOR_ONLY=1 \
AFL_FRAMESHIFT_DISABLE=1 \
AFL_DISABLE_TRIM=1 \
~/AFLplusplus/afl-fuzz -X -i /tmp/smite-seeds -o /tmp/smite-out -- /tmp/smite-nyx
```
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2 changes: 2 additions & 0 deletions smite-ir-mutator/src/lib.rs
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Expand Up @@ -13,6 +13,8 @@
//! - `AFL_CUSTOM_MUTATOR_ONLY=1` -- disable AFL++'s byte mutators. This also
//! disables the havoc stage entirely, so we deliberately do not implement
//! `afl_custom_havoc_mutation`.
//! - `AFL_FRAMESHIFT_DISABLE=1` -- disable AFL++'s `FrameShift` analysis that
//! bypasses our custom mutators.
Comment on lines +16 to +17
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@ekzyis ekzyis May 19, 2026

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nit: could mention that this was a bug fixed in AFLplusplus/AFLplusplus@eddb270

//! - `AFL_DISABLE_TRIM=1` -- this library does not implement custom trim and
//! AFL++'s default byte-level trim would corrupt our structured programs.
//!
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