From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from lamorak.hansenpartnership.com (lamorak.hansenpartnership.com [198.37.111.173]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 9DE63279325; Tue, 6 May 2025 13:21:51 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=198.37.111.173 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1746537714; cv=none; b=n2OlDGlUTeq64dF3MJOnbPla7Lnr0Vqbw2TcAJPcMJ3g5tGRPFywQFPjIJ+/Rk9C1+rnVEzSyHCAWFR+G9jt5T76vldXamTWH0H9U621k63FXOiK75FVkj3G5bv9NUqdqmQ35Qu9G1jL9TiVMyMMS/IBUizWx9uND7v6rFo9dYk= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1746537714; c=relaxed/simple; bh=1sYQKHiNE9CT1/Q3y1wTdvnC/t57kpOOwXfbb4X2XuI=; h=Message-ID:Subject:From:To:Cc:Date:In-Reply-To:References: Content-Type:MIME-Version; b=FW7ZwvftdfVtdbbH31/QtdXZ28lDUpZHlGSHTSwtJQnKDa17eS4Vj8meMqDi69a2CZRSeclmUc0VOgz+RcmcGoZRoU0IHxyarnE/mrK/tXbBPYnweYNKS/Wmm29FMmNII/MVBBTgkreObJmndDBWAlTOGzx+bPDj4OB8bR0fQaM= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=HansenPartnership.com; spf=pass smtp.mailfrom=HansenPartnership.com; dkim=pass (1024-bit key) header.d=hansenpartnership.com header.i=@hansenpartnership.com header.b=XDBUIPng; arc=none smtp.client-ip=198.37.111.173 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=HansenPartnership.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=HansenPartnership.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=hansenpartnership.com header.i=@hansenpartnership.com header.b="XDBUIPng" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=hansenpartnership.com; s=20151216; t=1746537710; bh=1sYQKHiNE9CT1/Q3y1wTdvnC/t57kpOOwXfbb4X2XuI=; h=Message-ID:Subject:From:To:Date:In-Reply-To:References:From; b=XDBUIPngN+dUUi9l8aP04UQ/xfCbyQ8WfuQE52LKrSOaXCAcB8NpncQMMYYdrm1QA Kcw/pMulSSq/If8BzHkGD1dCimS9XOxGYx9YPNwMcYlVRZ0tqVHN4WdEoGRis15xMo w/hcsRn0fVYJwLUqfxt0mRvwhztuDPLUCOtA+Ntg= Received: from lingrow.int.hansenpartnership.com (unknown [IPv6:2601:5c4:4302:c21::a774]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange x25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by lamorak.hansenpartnership.com (Postfix) with ESMTPSA id 2C9071C031C; Tue, 06 May 2025 09:21:49 -0400 (EDT) Message-ID: Subject: Re: [PATCH v3 0/9] module: Introduce hash-based integrity checking From: James Bottomley To: kpcyrd , Thomas =?ISO-8859-1?Q?Wei=DFschuh?= Cc: Masahiro Yamada , Nathan Chancellor , Arnd Bergmann , Luis Chamberlain , Petr Pavlu , Sami Tolvanen , Daniel Gomez , Paul Moore , James Morris , "Serge E. Hallyn" , Jonathan Corbet , Madhavan Srinivasan , Michael Ellerman , Nicholas Piggin , Christophe Leroy , Naveen N Rao , Mimi Zohar , Roberto Sassu , Dmitry Kasatkin , Eric Snowberg , Nicolas Schier , Fabian =?ISO-8859-1?Q?Gr=FCnbichler?= , Arnout Engelen , Mattia Rizzolo , Christian Heusel , =?ISO-8859-1?Q?C=E2ju?= Mihai-Drosi , 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 Date: Tue, 06 May 2025 09:21:48 -0400 In-Reply-To: References: <20250429-module-hashes-v3-0-00e9258def9e@weissschuh.net> <840b0334-71e4-45b1-80b0-e883586ba05c@t-8ch.de> Autocrypt: addr=James.Bottomley@HansenPartnership.com; prefer-encrypt=mutual; keydata=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 8mT2Eh9SkH+YVOmaKsajgZgrBxA7fWmGoxXswEVxJIFj3vW7yNc0C5HaUdYa5iGOMs4kg2ht4s7yy7NRQuh7BifWjo6BQ6k4S1H+6axZucxhSV1L6zN9d+lr3Xo/vy1unzA== Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable User-Agent: Evolution 3.50.3 Precedence: bulk X-Mailing-List: linux-modules@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 On Sat, 2025-05-03 at 01:43 +0200, kpcyrd wrote: > On 5/2/25 3:30 PM, James Bottomley wrote: [...] > > Or you simply ship tools to remove the signature; > >=20 > > sbattach --remove > >=20 > > already does this for you ... >=20 > It reads like you assume somebody sits down and explicitly looks at > the linux package manually, but the reproducible builds tooling > considers the package content to be fully opaque and doesn't have any > special-casing of any package: >=20 > https://github.com/archlinux/archlinux-repro > https://salsa.debian.org/debian/devscripts/-/blob/main/scripts/debrebuild= .pl?ref_type=3Dheads How something is packaged for consumers and what the outputs of a build are are two entirely different things. But if you control packaging, you could actually strip the signatures and place them in an unchecked section as long as you make sure to combine them on installation. > I'd rather not deal with the consequences of weakening the comparison > and possibly introducing exploitable loop-holes in any of the layers > we wouldn't be able to bit-for-bit compare anymore (like e.g. tar). To repeat the point: what everyone would like to do to make life easy is a bit different from what has to be done in the modern era of build provenance requirements. > It would also break the concept of `f(source) -> binary`, "you can=20 > deterministically derive the binary packages from the documented > build inputs", and instead you'd always need to fuzzy-match against > what somebody else built. I think you'll find f -> strip signature =C2=B0 build Works in the above equation. The point being it's deterministic, not fuzzy. Regards, James