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rustc fuzzing - Revision history
2026-07-04T15:49:53Z
Revision history for this page on the wiki
MediaWiki 1.41.1
http://vegard.wiki/mediawiki/index.php?title=rustc_fuzzing&diff=133&oldid=prev
Vegard: fix typo
2020-01-29T08:36:11Z
<p>fix typo</p>
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<td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">Revision as of 08:36, 29 January 2020</td>
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Vegard
http://vegard.wiki/mediawiki/index.php?title=rustc_fuzzing&diff=38&oldid=prev
Vegard: new page
2019-12-14T21:36:22Z
<p>new page</p>
<p><b>New page</b></p><div>Here is how to build rustc with AFL instrumentation:<br />
<br />
* Install AFL:<br />
:<source lang="Bash"><br />
cargo install afl<br />
</source><br />
:This will compile AFL and the LLVM plugins needed to build rust with AFL instrumentation.<br />
* Clone https://github.com/rust-lang/rust.<br />
* Set <tt>LD_LIBRARY_PATH</tt>:<br />
:<source lang="Bash"><br />
LIBRARY_PATH="$(realpath ~/.local/share/afl.rs/rustc-*/afl.rs-*/afl-llvm-rt"<br />
</source><br />
* Change the options used to compile rustc:<br />
:<source lang="Bash">RUSTFLAGS="-C llvm-args=-sanitizer-coverage-level=3 \<br />
-C llvm-args=-sanitizer-coverage-trace-pc-guard \<br />
-C passes=sancov \<br />
-l afl-llvm-rt \<br />
-L $(realpath ~/.local/share/afl.rs/rustc-*/afl.rs-*/afl-llvm-rt)"<br />
</source><br />
* Build rustc: <source lang="Bash">./x.py build</source><br />
* Test that it works:<br />
:<source lang="Bash"><br />
cargo afl showmap -o trace.txt -m 1024 -- \<br />
build/x86_64-unknown-linux-gnu/stage2/bin/rustc \<br />
--emit asm \ input.rs<br />
cat trace.txt<br />
</source><br />
* Clone https://github.com/rust-fuzz/afl.rs. This will give you the AFL version that you can use with the instrumented rustc.<br />
<br />
[[Category:Programming]]<br />
[[Category:Rust]]<br />
[[Category:Fuzzing]]</div>
Vegard