From patchwork Tue Aug 8 17:12:11 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sweet Tea Dorminy X-Patchwork-Id: 13346814 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 920E8C04E69 for ; Tue, 8 Aug 2023 18:55:17 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229722AbjHHSzQ (ORCPT ); Tue, 8 Aug 2023 14:55:16 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:54242 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232883AbjHHSyq (ORCPT ); Tue, 8 Aug 2023 14:54:46 -0400 Received: from box.fidei.email (box.fidei.email [71.19.144.250]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 38FD41B057; Tue, 8 Aug 2023 10:12:39 -0700 (PDT) Received: from authenticated-user (box.fidei.email [71.19.144.250]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits)) (No client certificate requested) by box.fidei.email (Postfix) with ESMTPSA id BC32A83441; Tue, 8 Aug 2023 13:12:38 -0400 (EDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=dorminy.me; s=mail; t=1691514759; bh=a6xP0jJSWbHcthsubcHuP76jkFDSkrf84bFyrS2PycI=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=k4MASSa6kgIIgCCAtm7FtQP1c5FYWko50nAA838AHiHR+0yimESWkUSHYmaRv/lQ8 +96mEUgLFCxH1W931euRikDOzesE9tD+WIcMX87rzsLf64BkEtrUBx8C0193GK8G3y xMWQVA8oG1kdGdY40dfTqZuEJf/vYrOJxTG4Wa0wpttLThDaJR1JoxzQOoqh064zOQ vC/3rGAHJRiP8R3pFbPplURiz5yfHL2v2qCTDqqzwRBp3UxswTNb2qiLeaXjha5EAR OnRaPNhBobOxq7TWZQqkvR3pVPjwGs+QqLZNJml+YaYqJDSKbSIhR4b0tbZHZEE2Xa 33HlTFOeu+9Eg== From: Sweet Tea Dorminy To: Chris Mason , Josef Bacik , David Sterba , "Theodore Y . Ts'o" , Jaegeuk Kim , kernel-team@meta.com, linux-btrfs@vger.kernel.org, linux-fscrypt@vger.kernel.org, Eric Biggers Cc: Omar Sandoval , Sweet Tea Dorminy Subject: [PATCH v3 09/17] btrfs: implement fscrypt ioctls Date: Tue, 8 Aug 2023 13:12:11 -0400 Message-ID: In-Reply-To: References: MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-btrfs@vger.kernel.org From: Omar Sandoval These ioctls allow encryption to actually be used. The set_encryption_policy ioctl is the thing which actually turns on encryption, and therefore sets the ENCRYPT flag in the superblock. This prevents the filesystem from being loaded on older kernels. fscrypt provides CONFIG_FS_ENCRYPTION-disabled versions of all these functions which just return -EOPNOTSUPP, so the ioctls don't need to be compiled out if CONFIG_FS_ENCRYPTION isn't enabled. We could instead gate this ioctl on the superblock having the flag set, if we wanted to require mkfs with the encrypt flag in order to have a filesystem with any encryption. Signed-off-by: Omar Sandoval Signed-off-by: Sweet Tea Dorminy --- fs/btrfs/ioctl.c | 28 ++++++++++++++++++++++++++++ 1 file changed, 28 insertions(+) diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c index 05984e5448b4..03ea92218749 100644 --- a/fs/btrfs/ioctl.c +++ b/fs/btrfs/ioctl.c @@ -4562,6 +4562,34 @@ long btrfs_ioctl(struct file *file, unsigned int return btrfs_ioctl_get_fslabel(fs_info, argp); case FS_IOC_SETFSLABEL: return btrfs_ioctl_set_fslabel(file, argp); + case FS_IOC_SET_ENCRYPTION_POLICY: { + if (!IS_ENABLED(CONFIG_FS_ENCRYPTION)) + return -EOPNOTSUPP; + if (sb_rdonly(fs_info->sb)) + return -EROFS; + /* + * If we crash before we commit, nothing encrypted could have + * been written so it doesn't matter whether the encrypted + * state persists. + */ + btrfs_set_fs_incompat(fs_info, ENCRYPT); + return fscrypt_ioctl_set_policy(file, (const void __user *)arg); + } + case FS_IOC_GET_ENCRYPTION_POLICY: + return fscrypt_ioctl_get_policy(file, (void __user *)arg); + case FS_IOC_GET_ENCRYPTION_POLICY_EX: + return fscrypt_ioctl_get_policy_ex(file, (void __user *)arg); + case FS_IOC_ADD_ENCRYPTION_KEY: + return fscrypt_ioctl_add_key(file, (void __user *)arg); + case FS_IOC_REMOVE_ENCRYPTION_KEY: + return fscrypt_ioctl_remove_key(file, (void __user *)arg); + case FS_IOC_REMOVE_ENCRYPTION_KEY_ALL_USERS: + return fscrypt_ioctl_remove_key_all_users(file, + (void __user *)arg); + case FS_IOC_GET_ENCRYPTION_KEY_STATUS: + return fscrypt_ioctl_get_key_status(file, (void __user *)arg); + case FS_IOC_GET_ENCRYPTION_NONCE: + return fscrypt_ioctl_get_nonce(file, (void __user *)arg); case FITRIM: return btrfs_ioctl_fitrim(fs_info, argp); case BTRFS_IOC_SNAP_CREATE: