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[34.125.46.171]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-2bd5cfe498asm164380125ad.39.2026.05.18.14.55.47 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 18 May 2026 14:55:48 -0700 (PDT) Date: Mon, 18 May 2026 21:55:43 +0000 From: Sami Tolvanen To: Thomas =?iso-8859-1?Q?Wei=DFschuh?= Cc: Alexei Starovoitov , Daniel Borkmann , Andrii Nakryiko , Eduard Zingerman , Kumar Kartikeya Dwivedi , Nathan Chancellor , Nicolas Schier , Arnd Bergmann , Luis Chamberlain , Petr Pavlu , Daniel Gomez , Paul Moore , James Morris , "Serge E. Hallyn" , Jonathan Corbet , Madhavan Srinivasan , Michael Ellerman , Nicholas Piggin , Naveen N Rao , Mimi Zohar , Roberto Sassu , Dmitry Kasatkin , Eric Snowberg , Nicolas Schier , Daniel Gomez , Aaron Tomlin , "Christophe Leroy (CS GROUP)" , Nicolas Bouchinet , Xiu Jianfeng , Martin KaFai Lau , Song Liu , Yonghong Song , Jiri Olsa , bpf@vger.kernel.org, Fabian =?iso-8859-1?Q?Gr=FCnbichler?= , Arnout Engelen , Mattia Rizzolo , kpcyrd , Christian Heusel , =?iso-8859-1?Q?C=E2ju?= Mihai-Drosi , Eric Biggers , Sebastian Andrzej Siewior , linux-kbuild@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arch@vger.kernel.org, linux-modules@vger.kernel.org, linux-security-module@vger.kernel.org, linux-doc@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, linux-integrity@vger.kernel.org, debian-kernel@lists.debian.org Subject: Re: [PATCH v5 00/14] module: Introduce hash-based integrity checking Message-ID: <20260518215543.GA1878854@google.com> References: <20260505-module-hashes-v5-0-e174a5a49fce@weissschuh.net> Precedence: bulk X-Mailing-List: linux-security-module@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <20260505-module-hashes-v5-0-e174a5a49fce@weissschuh.net> Hi Thomas, On Tue, May 05, 2026 at 11:05:04AM +0200, Thomas Weißschuh wrote: > The current signature-based module integrity checking has some drawbacks > in combination with reproducible builds. Either the module signing key > is generated at build time, which makes the build unreproducible, or a > static signing key is used, which precludes rebuilds by third parties > and makes the whole build and packaging process much more complicated. > > The goal is to reach bit-for-bit reproducibility. Excluding certain > parts of the build output from the reproducibility analysis would be > error-prone and force each downstream consumer to introduce new tooling. > > Introduce a new mechanism to ensure only well-known modules are loaded > by embedding a merkle tree root of all modules built as part of the full > kernel build into vmlinux. I noticed Sashiko had a few concerns about the build changes. Would you mind taking a look to see if they're valid? https://sashiko.dev/#/patchset/20260505-module-hashes-v5-0-e174a5a49fce%40weissschuh.net Sami