From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-pl1-f173.google.com (mail-pl1-f173.google.com [209.85.214.173]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 9D6B3398915 for ; Mon, 18 May 2026 21:55:50 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.214.173 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1779141351; cv=none; b=A3GQ5fW2Ke1LnV1jNgEQnEGOgfMWEUR66K8YbdjvaQBcOhNtidZSx0JHds52Q4RlxfWCd0ScugOGfXLdwJVXwcDQ08e8ZzHImeyYX9z0/P0Xl5Mg9hQpi51NUyO/sSZXZyopL/EmRaCiDfYePmQHBnDrxh0TG7gIJhtAmEjo3Uk= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1779141351; c=relaxed/simple; bh=WhaVFwVRm1Wf4thmzuA0e0qjOQLT9x+04R1dduxYWzY=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=QLiUFZ1gS7gDEc5iWppHGVY/UBO1j4ru508PC8hhKehmKwb0YRYvYgTK66VPHiD3TrsL2j3Y0v9BTeC6Sy6Pa9mjziMGzANXsWKB4BmktdGoolRxdu2QvgagjIlChMQ4xV7zxbBhABcv+MScq7x+QvL6JmfacgOL8E3r7YZtx1Y= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com; spf=pass smtp.mailfrom=google.com; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b=IvoDbo4V; arc=none smtp.client-ip=209.85.214.173 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=google.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="IvoDbo4V" Received: by mail-pl1-f173.google.com with SMTP id d9443c01a7336-2ba3b9bcf69so765ad.0 for ; Mon, 18 May 2026 14:55:50 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20251104; t=1779141350; x=1779746150; darn=vger.kernel.org; h=in-reply-to:content-transfer-encoding:content-disposition :mime-version:references:message-id:subject:cc:to:from:date:from:to :cc:subject:date:message-id:reply-to; bh=eATlafWR2CpUln9HSfV3CyzBd2Vyaqeh6UVZyYqlodE=; b=IvoDbo4V1nj4Q9OWvBMcUPpA6eDFfBAFbu4ry1ujeKWH4fYBAFNjP7BApepEoXKgFW echIH2GbEhb+kGhHlHfftLXlBnHDih1oHm9UtaSSK5CAFRUvXh1PCqOj+XI9wKqJnmv9 BdHZsxEJDc6k4l629t6bytiQfWInZt6CAKX455PJMRgqGvsL+3fHb7ubaoj1OjP5TMpJ apWTAqJbeutKX9DtvRx+hRvKlId5JUFry4JYzoUpiHudyEvfAoPlfnA1GOb/KpKOehgq VY2sjO/zadidGT8zNRrbzepfosggp1gNZrno+6RpVU2wOW8V9Y0N7qAHPHbOdQPTZ4W2 afYw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1779141350; x=1779746150; h=in-reply-to:content-transfer-encoding:content-disposition :mime-version:references:message-id:subject:cc:to:from:date:x-gm-gg :x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=eATlafWR2CpUln9HSfV3CyzBd2Vyaqeh6UVZyYqlodE=; b=TSK+4ywValGhp2ak6l0eR7KFlmvcHoglOgxD4bb/sNAfP6FrZRkh9AeD4ud6HCWT94 AoPM5erb3LrQySyo/ZkHCvrkL9SPj+6oTePM7MpQN/SKg/3ZS9Ait2n3GIgV8KuvzV/P NwYt+G6K+vYTfC7Hq+7kFjfuJF05U/ha6x8+HwNYSX/ikZMtx5bEiWqqL7IczmRnD3YA x1/DZVIpkHrzMd16xPmMmLeXmqnLQvcmvECv+uz3OjjoRyPYDRz57dFbCkKtnIqSHkjH vD9fezqZ6tYJQTKWuCGI8kmDmSzDWzin3lu7pz5Xn/F5+maeUuhhhZMgJWLp5605txJf DSkQ== X-Forwarded-Encrypted: i=1; AFNElJ9lK4IkjQKs+U7yQ8M0VVGN0/o7xgf2qX3pnjB5Gfan9EZiykevYhJMbAGxGWeHL/JJ9UIbpZ0kYZZJK6kj@vger.kernel.org X-Gm-Message-State: AOJu0YxKPtQSU6z++bdlOErV0K6tOEHUO6WfuZrf1zcCOVlRu9yPg7k+ SzX9an/RSM6S5owk/9hHntzN9fehCLqI66L609cHr6arf0x+FPPrf06AwcTUtois6w== X-Gm-Gg: Acq92OGsC1KL6ufGQEk67BE+nYrCQ6MmlhOSOqAyZknttVtcraM3t62aoSmMVpOZiCF /UbsVq6AoxFCKwAApkSeu1ePCXobwsiaKuc6D1lgkNG0t2BLhskVQoBfLksM9B3vERykFkQyIJY e/bYnFARWzOcYxIIkQhjIa9kbfcUXz6NrqsRoUt6U8JeCWyq2CUr4tfUfmvNfFcuk3NTnJbrmfr pzumei58NN+cMStkL4aF9PpZQ8/k2QdIEameNRsCrkHyaTSmgZfozP6yLCeyNfXDgQA3wN7UNcP 4jtOCv3yIPjCG75p+LQFXDVFJuX1WKY8kM0rER/QOeSlvTAw4CdObYEpYn1eW4N1ldWsYyPdocm qY/DQ/AfZosXZvfsvgcM1SQCvwjBiyCMnr96F/C9cs/7DdYJexn2SHAekINibBVG+kc1E9Pgh1T 0GYtXXL0otC5zpmQreR7ok3vHIhDMhFGYamh7r9pnfMVzcMuMDVsF5rE4kInFOhVzcam4Wywwrr u94XFzUClA+mvDJ X-Received: by 2002:a17:902:d512:b0:2bc:dc0b:ab29 with SMTP id d9443c01a7336-2bdb0109472mr3880435ad.0.1779141349445; Mon, 18 May 2026 14:55:49 -0700 (PDT) Received: from google.com (171.46.125.34.bc.googleusercontent.com. [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-modules@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