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[130.126.255.83]) by smtp.gmail.com with ESMTPSA id af79cd13be357-8be31c75b79sm290605685a.53.2025.12.16.17.09.49 (version=TLS1_3 cipher=TLS_CHACHA20_POLY1305_SHA256 bits=256/256); Tue, 16 Dec 2025 17:09:51 -0800 (PST) From: Wentao Zhang To: ethan.w.s.graham@gmail.com Cc: andreyknvl@gmail.com, andy.shevchenko@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, glider@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, Wentao Zhang Subject: Re: [PATCH v3 00/10] KFuzzTest: a new kernel fuzzing framework Date: Tue, 16 Dec 2025 19:08:53 -0600 Message-Id: <20251217010853.54863-1-wentaoz5@illinois.edu> X-Mailer: git-send-email 2.39.5 (Apple Git-154) In-Reply-To: <20251204141250.21114-1-ethan.w.s.graham@gmail.com> References: <20251204141250.21114-1-ethan.w.s.graham@gmail.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspam-User: X-Rspamd-Queue-Id: 81E99C0004 X-Rspamd-Server: rspam10 X-Stat-Signature: a8877ie8zh9rog91toa83smgerg8ajgb X-HE-Tag: 1765933792-933345 X-HE-Meta: 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 70WAB0P9 zSj5MxYYVbp4WSsaYkFtuj9XJgRU8BkjIZUo3Q1QFbgWNiA+b+aD+/XDEENOuLHmn2vf5AKE1HYbCz3ob4ahKnGpWTexm+oW8sC1eJDsgChuwz64ST300Z7q/RCGTmJy1dQ/mES9SbsBx21j//0I5a4LwzJ86c7p0dmK7h3T0NL3VZS4AIRZFCsT2xk12Rqnyy+I/QlDz9vwfaMPOTiS/3ScMmA4V3Dfrqf2YYMAer5ffP+5L8zYyQbaWrY70zNkLy4ll2Iz3p6xxwcqJ94uEt+1eWq6n3PMuxafkwThLCspngrbYIFIcnxLf0JD38Fyz9kx0UhKV8bf99cBlVem2Y4ZdV0IdJ4MnGDAwepGWvE7sozAcr7airOBobh7ubTyxI9Gt89Cm4QR7Q+t4t44m4R/rjS8JuUyfvPQ0ZqE+UkZ7uBMMebG+Suh/w29C3cECuNs/at5+uooEU4k= 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: Hi Ethan, This looks interesting! On Thu, 4 Dec 2025 15:12:39 +0100, Ethan Graham wrote: > This patch series introduces KFuzzTest, a lightweight framework for > creating in-kernel fuzz targets for internal kernel functions. > > The primary motivation for KFuzzTest is to simplify the fuzzing of > low-level, relatively stateless functions (e.g., data parsers, format Do you have any idea how this could be extended to target more stateful functions? > converters) that are difficult to exercise effectively from the syscall > boundary. It is intended for in-situ fuzzing of kernel code without > requiring that it be built as a separate userspace library or that its > dependencies be stubbed out. Using a simple macro-based API, developers > can add a new fuzz target with minimal boilerplate code. > > The core design consists of three main parts: > 1. The `FUZZ_TEST(name, struct_type)` and `FUZZ_TEST_SIMPLE(name)` > macros that allow developers to easily define a fuzz test. > 2. A binary input format that allows a userspace fuzzer to serialize > complex, pointer-rich C structures into a single buffer. > 3. Metadata for test targets, constraints, and annotations, which is > emitted into dedicated ELF sections to allow for discovery and > inspection by userspace tools. These are found in > ".kfuzztest_{targets, constraints, annotations}". > > As of September 2025, syzkaller supports KFuzzTest targets out of the > box, and without requiring any hand-written descriptions - the fuzz Do you happen to have some numbers on coverage, convergence time etc. before and after KFuzzTest? Thanks, Wentao > target and its constraints + annotations are the sole source of truth. > [snip]