From patchwork Fri Oct 18 18:43:35 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Eric Biggers X-Patchwork-Id: 13842221 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 C7F34204018; Fri, 18 Oct 2024 18:45:04 +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=1729277105; cv=none; b=TRnoUqxd5EkqjTWZt+goNO7RWMYuDd+s8yjloVy4Bemccakiwu3s37v0TXzLjX5Popul1FxDMlFxHZK+qpDy2gn6Tx3hoRXMIiq43CFGsn9dyTYQooMCDlR68meNeJ9RxYBD7jbtkzK7vDztAmuw8FIQuOeaYa1AJviyia1ztYk= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1729277105; c=relaxed/simple; bh=ezUq8Gu+1gxpe+LETiT3thtchxlc506pUFTtsAKJMHY=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=d6XOWs1o9eS+pvVMoAXu2tNFpqGzyQJHq1eEtRQKwbYRKVcu58OVqZOWtHwkhFuG3Q+WC4YIQdZ9mwCmcvZZfMGjA/860RHUV+8flDrZxUA3gm1Kg4Ny88me+j78BZYJu1qZTn9NxJCknSDTxoppTBBmvopjG5M/zHnMM2QUiXs= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=pCWm9W6j; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="pCWm9W6j" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 14439C4CEC3; Fri, 18 Oct 2024 18:45:04 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1729277104; bh=ezUq8Gu+1gxpe+LETiT3thtchxlc506pUFTtsAKJMHY=; h=From:To:Cc:Subject:Date:From; b=pCWm9W6j1rRPWi/RGVpopSxu3ME0YjjlmGkuaCHtilbMI1n5K/lgFXujKcxZnVOgP Z+vXZ0iwvbcZ5E4GN3qQ7nn2jZOliV130WPq95w6cfhKn1Nlv+iwaLQPy+lyPPM75O NdvkdEXUJURhHQ7+IVOPEtTDnu/CXYF81uv5ndOwn/itHHNFFZksshsRGq5Gu53Jvz GoTO+HvohehDrrO7b1/c1+gEpjy2Rgok0knackTkbYqgPkbe4Lhq3JVa3++EMzou/K YMtOpONL0Pmkhfzx9qOgs9EA3kJq3cvfdOM/S54m43F4DShItmMIsCucWQTupUAwTT fszVNEg8x4hGg== From: Eric Biggers To: dm-devel@lists.linux.dev Cc: linux-block@vger.kernel.org, linux-kernel@vger.kernel.org, linux-fscrypt@vger.kernel.org, linux-ext4@vger.kernel.org, linux-f2fs-devel@lists.sourceforge.net, Md Sadre Alam , Israel Rukshin , Milan Broz , Mikulas Patocka , Adrian Vovk Subject: [RFC PATCH 0/4] dm-default-key: target for filesystem metadata encryption Date: Fri, 18 Oct 2024 11:43:35 -0700 Message-ID: <20241018184339.66601-1-ebiggers@kernel.org> X-Mailer: git-send-email 2.47.0 Precedence: bulk X-Mailing-List: linux-fscrypt@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 This series adds "metadata encryption" support to ext4 and f2fs via a new device-mapper target dm-default-key. dm-default-key encrypts all data on a block device that isn't already encrypted by the filesystem. Except for the passthrough support, dm-default-key is basically the same as the proposed dm-inlinecrypt which omits that feature (https://lore.kernel.org/dm-devel/20241016232748.134211-1-ebiggers@kernel.org/). I am sending this out for reference, as dm-default-key (which Android has been using for a while) hasn't previously been sent to the lists in full, and there has been interest in it. However, my current impression is that this feature will need to be redesigned as a filesystem native feature in order to make it upstream. If that is indeed the case, then IMO it would make sense to merge dm-inlinecrypt in the mean time instead (or add its functionality to dm-crypt) so that anyone who just wants "dm-crypt + inline encryption hardware" gets a solution for that. Eric Biggers (4): block: export blk-crypto symbols required by dm-default-key block: add the bi_skip_dm_default_key flag dm-default-key: add target for filesystem metadata encryption ext4,f2fs: support metadata encryption via dm-default-key block/bio.c | 3 + block/blk-crypto-fallback.c | 2 + block/blk-crypto.c | 3 + drivers/md/Kconfig | 20 ++ drivers/md/Makefile | 1 + drivers/md/dm-default-key.c | 431 ++++++++++++++++++++++++++++++++++++ fs/crypto/inline_crypt.c | 14 +- fs/f2fs/data.c | 6 +- include/linux/blk-crypto.h | 36 +++ include/linux/blk_types.h | 3 + include/linux/fscrypt.h | 14 ++ 11 files changed, 531 insertions(+), 2 deletions(-) create mode 100644 drivers/md/dm-default-key.c base-commit: c964ced7726294d40913f2127c3f185a92cb4a41