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Tue, 20 Jan 2026 06:04:46 -0800 (PST) MIME-Version: 1.0 References: <20260112192827.25989-1-ethan.w.s.graham@gmail.com> <20260112192827.25989-5-ethan.w.s.graham@gmail.com> In-Reply-To: <20260112192827.25989-5-ethan.w.s.graham@gmail.com> From: Alexander Potapenko Date: Tue, 20 Jan 2026 15:04:09 +0100 X-Gm-Features: AZwV_QjNl1xBiyaK93_mkyw1s5efrvsnk9WwoFCUyx7252b7lOOknPIAjr9SWYE Message-ID: Subject: Re: [PATCH v4 4/6] kfuzztest: add KFuzzTest sample fuzz targets To: Ethan Graham Cc: akpm@linux-foundation.org, andreyknvl@gmail.com, andy@kernel.org, andy.shevchenko@gmail.com, brauner@kernel.org, brendan.higgins@linux.dev, davem@davemloft.net, davidgow@google.com, dhowells@redhat.com, dvyukov@google.com, ebiggers@kernel.org, elver@google.com, gregkh@linuxfoundation.org, 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, mcgrof@kernel.org, rmoar@google.com, shuah@kernel.org, sj@kernel.org, skhan@linuxfoundation.org, tarasmadan@google.com, wentaoz5@illinois.edu Content-Type: text/plain; charset="UTF-8" X-Rspamd-Queue-Id: 4BAA9140003 X-Stat-Signature: gwuxd6fozss1mi6ktznhs3hikr399f15 X-Rspam-User: X-Rspamd-Server: rspam10 X-HE-Tag: 1768917888-897651 X-HE-Meta: U2FsdGVkX19CSuI3J2FfMYR8ziURTetbIhNRmbBMf430MUey7jp2PZEERJ8TFrD+VfTsAItcZ9VLlSiND/Cb05PgWJaW4rvWjS7WPJL19WElSbhyyMHqvNYiZFCScbaAAa4YiuYRPuA8lRzT5Y+os60BnqSVB8ygkqg+NzavBlBdLRqkn9izE2cfz3dFgx0lEPrlMnV1jaR0++Z3kr8s1B8RC09H4ay4KMAVU2xEQrZtihwK1EvIdAmrrrFbEW2svWyWo0z0XUOwYJUn8UKeNRx7wskIg8mvsAGaRtlQQjdDNAo1mPwWuhPcyAvVFEp6qyTZQ8OhOyRa9eKjGftUUXc4XTDsTPKQ4/mpQWvQNmfkZI5dmH4Hdlq6/nuIBLr3D4qayIrLoF4EmO+3OfKEWnjwia/YaOUZR1TVus+ROSj3v6T5hnZ88XtC/z4DIQ2MQr7W7akLr2wHEL5ANn6aoe3pQRlZR4cirp+G3W4CM04T9SDmJzyrAFaFKTJQkUv9kMNeckQeMdltEUHCa/zmOk3uG1bMUNGoaxFTNIMjXy6op9tgLC9nC7HMhnViPEuk+7QMK+hUPa4S83JCeNwjqb7cTe2V46KhUefigpgTlGsbCjuFJYkYfaIREDsGVZFgbGzKzTAJqRgpBhMsZ1SOojfa+TgOfo8U1TEtjh0W79/m1CiK3L1M0DdMyIsEFpeIdF4z+GOGjs82+g0wqPvV1KMhUBHDrpiReez61Denlp6fweZ9vb6Tlg3WNUEsAwMCKpCW1BQmbj8nYj4KE7zZy1HH2Exjafy47jSYBUk5PPGOjst9wpPFUlNFyMh/rFUY1u4KRZ2RewrrYAVSMOqJ/6EP+4VENJeqaQ4CfILndpK9l8G/L2+nZZy1Po1hP/aLD2FD22fgybuli2EagluAV7SvgwDeI6JfcfBrQTwb1x8Fn6HqjINsNIOE2RIOx2QOmrXln6rCh1BJ/Lbuk6U jkcrK3zd YSltBs7mzn0aRcfG/XFD+p5Tkszg8iFh1on5UJQWAjqWZcB5V5GHPLP4cLQ== 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: > +#include > + > +static void underflow_on_buffer(char *buf, size_t buflen) > +{ > + size_t i; > + If buflen is 0, buf is a ZERO_SIZE_PTR. I think we should allow passing such pointers to test functions, but each test should then correctly bail out on empty data.