From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (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 2555320C488; Tue, 29 Apr 2025 18:09:26 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1745950166; cv=none; b=rb/0pIciRIaMjLIhUWUyqYBfXja+nFKyib4Iw7l+fRd6LLUv8YboRDBwLQz9I300hRntu7lxFuhNSD2hXVXDZ09DUy2d1hrxnsGbCfD3bDn0fq7qYDFtGo9/TIQ62y2lIOtO3ObTeV+dNTiGwY8DLSzr3kK3WritF2yBpfETsWo= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1745950166; c=relaxed/simple; bh=yJ5n/y/SQWjkTiAmmex0ZZ/+bFhWwelf4QgI62N13f8=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=cEeDpBZac4uNt9Ni1p2vS/+tsJsz2NoItyqQuJfRX1u7xKgsjMx8NMuFArnk9+LdgAFN8/AdURajERzs8l3wuIFGdwQGLM9bHAftFML2F3zKA1ZmFtxk9yn5T7OEU0ay7OlFSnFFr3zYeT7WYj+LQOqpbYgqcWYUaMBB6sByKlk= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=sSv7+8Bt; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="sSv7+8Bt" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 9807AC4CEE9; Tue, 29 Apr 2025 18:09:25 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1745950166; bh=yJ5n/y/SQWjkTiAmmex0ZZ/+bFhWwelf4QgI62N13f8=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=sSv7+8Bt69sHhmcZ0dVCk/rcltPhLZn4bDJgm+40SVe1ZHseT5pAip6/33eCGtKCd /GO+kgBKZnkouZaezzKY5o3vG1U0k4EEtzY+xC+64FgTXiK9LbYKOfh0BIMd6meZgf KhVPT/xAM7xjfypzMqrmLdUZpqMHxVarM+P0skGM= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Thorsten Leemhuis , Sami Tolvanen , Petr Pavlu , kdevops Subject: [PATCH 6.6 001/204] module: sign with sha512 instead of sha1 by default Date: Tue, 29 Apr 2025 18:41:29 +0200 Message-ID: <20250429161059.459611074@linuxfoundation.org> X-Mailer: git-send-email 2.49.0 In-Reply-To: <20250429161059.396852607@linuxfoundation.org> References: <20250429161059.396852607@linuxfoundation.org> User-Agent: quilt/0.68 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 6.6-stable review patch. If anyone has any objections, please let me know. ------------------ From: Thorsten Leemhuis commit f3b93547b91ad849b58eb5ab2dd070950ad7beb3 upstream. Switch away from using sha1 for module signing by default and use the more modern sha512 instead, which is what among others Arch, Fedora, RHEL, and Ubuntu are currently using for their kernels. Sha1 has not been considered secure against well-funded opponents since 2005[1]; since 2011 the NIST and other organizations furthermore recommended its replacement[2]. This is why OpenSSL on RHEL9, Fedora Linux 41+[3], and likely some other current and future distributions reject the creation of sha1 signatures, which leads to a build error of allmodconfig configurations: 80A20474797F0000:error:03000098:digital envelope routines:do_sigver_init:invalid digest:crypto/evp/m_sigver.c:342: make[4]: *** [.../certs/Makefile:53: certs/signing_key.pem] Error 1 make[4]: *** Deleting file 'certs/signing_key.pem' make[4]: *** Waiting for unfinished jobs.... make[3]: *** [.../scripts/Makefile.build:478: certs] Error 2 make[2]: *** [.../Makefile:1936: .] Error 2 make[1]: *** [.../Makefile:224: __sub-make] Error 2 make[1]: Leaving directory '...' make: *** [Makefile:224: __sub-make] Error 2 This change makes allmodconfig work again and sets a default that is more appropriate for current and future users, too. Link: https://www.schneier.com/blog/archives/2005/02/cryptanalysis_o.html [1] Link: https://csrc.nist.gov/projects/hash-functions [2] Link: https://fedoraproject.org/wiki/Changes/OpenSSLDistrustsha1SigVer [3] Signed-off-by: Thorsten Leemhuis Reviewed-by: Sami Tolvanen Tested-by: kdevops [0] Link: https://github.com/linux-kdevops/linux-modules-kpd/actions/runs/11420092929/job/31775404330 [0] Link: https://lore.kernel.org/r/52ee32c0c92afc4d3263cea1f8a1cdc809728aff.1729088288.git.linux@leemhuis.info Signed-off-by: Petr Pavlu Signed-off-by: Greg Kroah-Hartman --- kernel/module/Kconfig | 1 + 1 file changed, 1 insertion(+) --- a/kernel/module/Kconfig +++ b/kernel/module/Kconfig @@ -229,6 +229,7 @@ comment "Do not forget to sign required choice prompt "Which hash algorithm should modules be signed with?" depends on MODULE_SIG || IMA_APPRAISE_MODSIG + default MODULE_SIG_SHA512 help This determines which sort of hashing algorithm will be used during signature generation. This algorithm _must_ be built into the kernel