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| <section id="fuzzing-arrow-c"> |
| <span id="cpp-fuzzing"></span><h1>Fuzzing Arrow C++<a class="headerlink" href="#fuzzing-arrow-c" title="Permalink to this heading">#</a></h1> |
| <p>To make the handling of invalid input more robust, we have enabled |
| fuzz testing on several parts of the Arrow C++ feature set, currently:</p> |
| <ul class="simple"> |
| <li><p>the IPC stream format</p></li> |
| <li><p>the IPC file format</p></li> |
| <li><p>the Parquet file format</p></li> |
| </ul> |
| <p>We welcome any contribution to expand the scope of fuzz testing and cover |
| areas ingesting potentially invalid or malicious data.</p> |
| <section id="fuzz-targets-and-utilities"> |
| <h2>Fuzz Targets and Utilities<a class="headerlink" href="#fuzz-targets-and-utilities" title="Permalink to this heading">#</a></h2> |
| <p>By passing the <code class="docutils literal notranslate"><span class="pre">-DARROW_FUZZING=ON</span></code> CMake option (or equivalently, using |
| the <code class="docutils literal notranslate"><span class="pre">fuzzing</span></code> preset), you will build the fuzz targets corresponding to |
| the aforementioned Arrow features, as well as additional related utilities.</p> |
| <section id="generating-the-seed-corpus"> |
| <h3>Generating the seed corpus<a class="headerlink" href="#generating-the-seed-corpus" title="Permalink to this heading">#</a></h3> |
| <p>Fuzzing essentially explores the domain space by randomly mutating previously |
| tested inputs, without having any high-level understanding of the area being |
| fuzz-tested. However, the domain space is so huge that this strategy alone |
| may fail to actually produce any “interesting” inputs.</p> |
| <p>To guide the process, it is therefore important to provide a <em>seed corpus</em> |
| of valid (or invalid, but remarkable) inputs from which the fuzzing |
| infrastructure can derive new inputs for testing. A script is provided |
| to automate that task. Assuming the fuzzing executables can be found in |
| <code class="docutils literal notranslate"><span class="pre">build/debug</span></code>, the seed corpus can be generated thusly:</p> |
| <div class="highlight-console notranslate"><div class="highlight"><pre><span></span><span class="gp">$ </span>./build-support/fuzzing/generate_corpuses.sh<span class="w"> </span>build/debug |
| </pre></div> |
| </div> |
| </section> |
| </section> |
| <section id="continuous-fuzzing-infrastructure"> |
| <h2>Continuous fuzzing infrastructure<a class="headerlink" href="#continuous-fuzzing-infrastructure" title="Permalink to this heading">#</a></h2> |
| <p>The process of fuzz testing is computationally intensive and therefore |
| benefits from dedicated computing facilities. Arrow C++ is exercised by |
| the <a class="reference external" href="https://google.github.io/oss-fuzz/">OSS-Fuzz</a> continuous fuzzing infrastructure operated by Google.</p> |
| <p>Issues found by OSS-Fuzz are notified and available to a limited set of |
| <a class="reference external" href="https://github.com/google/oss-fuzz/blob/master/projects/arrow/project.yaml">core developers</a>. |
| If you are a Arrow core developer and want to be added to that list, you can |
| ask on the <a class="reference internal" href="../index.html#contributing"><span class="std std-ref">mailing-list</span></a>.</p> |
| </section> |
| <section id="reproducing-locally"> |
| <h2>Reproducing locally<a class="headerlink" href="#reproducing-locally" title="Permalink to this heading">#</a></h2> |
| <p>When a crash is found by fuzzing, it is often useful to download the data |
| used to produce the crash, and use it to reproduce the crash so as to debug |
| and investigate.</p> |
| <p>Assuming you are in a subdirectory inside <code class="docutils literal notranslate"><span class="pre">cpp</span></code>, the following command |
| would allow you to build the fuzz targets with debug information and the |
| various sanitizer checks enabled.</p> |
| <div class="highlight-console notranslate"><div class="highlight"><pre><span></span><span class="gp">$ </span>cmake<span class="w"> </span>..<span class="w"> </span>--preset<span class="o">=</span>fuzzing |
| </pre></div> |
| </div> |
| <p>Then, assuming you have downloaded the crashing data file (let’s call it |
| <code class="docutils literal notranslate"><span class="pre">testcase-arrow-ipc-file-fuzz-123465</span></code>), you can reproduce the crash |
| by running the affected fuzz target on that file:</p> |
| <div class="highlight-console notranslate"><div class="highlight"><pre><span></span><span class="gp">$ </span>build/debug/arrow-ipc-file-fuzz<span class="w"> </span>testcase-arrow-ipc-file-fuzz-123465 |
| </pre></div> |
| </div> |
| <p>(you may want to run that command under a debugger so as to inspect the |
| program state more closely)</p> |
| <section id="using-conda"> |
| <h3>Using conda<a class="headerlink" href="#using-conda" title="Permalink to this heading">#</a></h3> |
| <p>The fuzzing executables must be compiled with clang and linked to libraries |
| which provide a fuzzing runtime. If you are using conda to provide your |
| dependencies, you may need to install these before building the fuzz targets:</p> |
| <div class="highlight-console notranslate"><div class="highlight"><pre><span></span><span class="gp">$ </span>conda<span class="w"> </span>install<span class="w"> </span>clang<span class="w"> </span>clangxx<span class="w"> </span>compiler-rt |
| <span class="gp">$ </span>cmake<span class="w"> </span>..<span class="w"> </span>--preset<span class="o">=</span>fuzzing |
| </pre></div> |
| </div> |
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