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Fri, 19 Sep 2025 08:07:51 -0700 (PDT) MIME-Version: 1.0 References: <20250919145750.3448393-1-ethan.w.s.graham@gmail.com> <20250919145750.3448393-9-ethan.w.s.graham@gmail.com> In-Reply-To: <20250919145750.3448393-9-ethan.w.s.graham@gmail.com> From: Alexander Potapenko Date: Fri, 19 Sep 2025 17:07:14 +0200 X-Gm-Features: AS18NWCM6kR1_nk7adaxFawciRK7byb-Gyk4MeMsfOVVpcb45qo2C2pvMXupxjs Message-ID: Subject: Re: [PATCH v2 08/10] drivers/auxdisplay: add a KFuzzTest for parse_xy() To: Ethan Graham Cc: ethangraham@google.com, andreyknvl@gmail.com, andy@kernel.org, brauner@kernel.org, brendan.higgins@linux.dev, davem@davemloft.net, davidgow@google.com, dhowells@redhat.com, dvyukov@google.com, elver@google.com, herbert@gondor.apana.org.au, ignat@cloudflare.com, jack@suse.cz, jannh@google.com, johannes@sipsolutions.net, kasan-dev@googlegroups.com, kees@kernel.org, kunit-dev@googlegroups.com, linux-crypto@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, lukas@wunner.de, rmoar@google.com, shuah@kernel.org, sj@kernel.org, tarasmadan@google.com Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-Rspam-User: X-Rspamd-Server: rspam02 X-Rspamd-Queue-Id: A6B6CA0006 X-Stat-Signature: fkyje5ctfiaiyckcfo11t1geuk4o7wne X-HE-Tag: 1758294473-382213 X-HE-Meta: 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 jTCvuxDk peyZQ4iTiRa0Qhk5gRtHPE+qvK5ZFDK68hZbDYl+LOGNLPoEJ2NWVu4DLgpeLd/vnvoD5J/5PUsGg0WRm5+1m/HZf+fzpec+DSrS1VQ3tCy25vc6TZEiFRUjzXGYjdN14sNb/GHT/GF3WxBV/1uGkEgs+IsOc2O5IqScNMF+JShscrYBpKbNU1Qf3qJfrj1+suCvXXe5Gi8HBHBIEnHJDP3TiIlGqA8YSkcEVkG5w9mqcEWlO6J8L5Rz+g3MQXfWeraPSPwBJo6ipKIRrbMG48inqq70qJwAdFdaz4+y8xD3An3kfkEgA4mCo0Lg7g9bRU5XKn8jUqSA+8WnRYlH61LSgzbZ49vD7NEPt+5F9cSf9krU= X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Fri, Sep 19, 2025 at 4:58=E2=80=AFPM Ethan Graham wrote: > > From: Ethan Graham > > Add a KFuzzTest fuzzer for the parse_xy() function, located in a new > file under /drivers/auxdisplay/tests. > > To validate the correctness and effectiveness of this KFuzzTest target, > a bug was injected into parse_xy() like so: > > drivers/auxdisplay/charlcd.c:179 > - s =3D p; > + s =3D p + 1; > > Although a simple off-by-one bug, it requires a specific input sequence > in order to trigger it, thus demonstrating the power of pairing > KFuzzTest with a coverage-guided fuzzer like syzkaller. > > Signed-off-by: Ethan Graham Acked-by: Alexander Potapenko