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Tue, 21 Jul 2020 05:31:57 +0000 (UTC) Subject: Re: [PATCH 4/4] docs/fuzz: add instructions for generating a coverage report To: Alexander Bulekov , qemu-devel@nongnu.org References: <20200706195534.14962-1-alxndr@bu.edu> <20200706195534.14962-5-alxndr@bu.edu> <20200707044124.d4f2em2cdfivdrcq@mozz.bu.edu> From: Thomas Huth Openpgp: preference=signencrypt Message-ID: <33421314-aca3-7d59-f712-1763d6848c5e@redhat.com> Date: Tue, 21 Jul 2020 07:31:56 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.9.0 MIME-Version: 1.0 In-Reply-To: <20200707044124.d4f2em2cdfivdrcq@mozz.bu.edu> Content-Language: en-US X-Scanned-By: MIMEDefang 2.84 on 10.5.11.22 X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 7bit Received-SPF: pass client-ip=207.211.31.81; envelope-from=thuth@redhat.com; helo=us-smtp-delivery-1.mimecast.com X-detected-operating-system: by eggs.gnu.org: First seen = 2020/07/21 01:32:09 X-ACL-Warn: Detected OS = Linux 2.2.x-3.x [generic] [fuzzy] X-Spam_score_int: -30 X-Spam_score: -3.1 X-Spam_bar: --- X-Spam_report: (-3.1 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-1, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H3=-0.01, RCVD_IN_MSPIKE_WL=-0.01, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: bsd@redhat.com, philmd@redhat.com, stefanha@redhat.com Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" On 07/07/2020 06.41, Alexander Bulekov wrote: > On 200706 1555, Alexander Bulekov wrote: >> Signed-off-by: Alexander Bulekov >> --- >> docs/devel/fuzzing.txt | 19 +++++++++++++++++++ >> 1 file changed, 19 insertions(+) >> >> diff --git a/docs/devel/fuzzing.txt b/docs/devel/fuzzing.txt >> index 284d57f8fd..a9816ffce9 100644 >> --- a/docs/devel/fuzzing.txt >> +++ b/docs/devel/fuzzing.txt >> @@ -85,6 +85,25 @@ better coverage performance, depending on the target. >> Note that libFuzzer's exact behavior will depend on the version of >> clang and libFuzzer used to build the device fuzzers. >> >> +== Generating Coverage Reports == >> +Code coverage is a crucial metric for evaluating a fuzzer's performance. >> +libFuzzer's output provides a "cov: " column that provides a total number of >> +unique blocks/edges covered. To examine coverage on a line-by-line basis we >> +can use Clang coverage: >> + >> + 1. Configure libFuzzer to store a corpus of all interesting inputs (see >> + CORPUS_DIR above) >> + 2. ./configure the QEMU build with: >> + --enable-sanitizers \ > Oops... that should be --enable-fuzzing \ I've pushed it with the fix applied to my qtest-next branch: https://gitlab.com/huth/qemu/-/commits/qtest-next/ Thomas