From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751200AbeAVQZX (ORCPT ); Mon, 22 Jan 2018 11:25:23 -0500 Received: from mail-wm0-f68.google.com ([74.125.82.68]:41705 "EHLO mail-wm0-f68.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751087AbeAVQZV (ORCPT ); Mon, 22 Jan 2018 11:25:21 -0500 X-Google-Smtp-Source: AH8x226Dl8dz9zSomHefe2JtdqldIyENp1xgAf7T5n6+dJYl/p/Z/brB4VE+tqt7hLL42u+jXVZWOA== From: Alban Crequy X-Google-Original-From: Alban Crequy To: alban@kinvolk.io Cc: dongsu@kinvolk.io, iago@kinvolk.io, linux-kernel@vger.kernel.org, linux-integrity@vger.kernel.org, linux-security-module@vger.kernel.org, linux-fsdevel@vger.kernel.org, miklos@szeredi.hu, viro@zeniv.linux.org.uk, zohar@linux.vnet.ibm.com, dmitry.kasatkin@gmail.com, james.l.morris@oracle.com, serge@hallyn.com, seth.forshee@canonical.com, hch@infradead.org Subject: [RFC PATCH v3 1/2] fuse: introduce new fs_type flag FS_IMA_NO_CACHE Date: Mon, 22 Jan 2018 17:24:51 +0100 Message-Id: <20180122162452.8756-2-alban@kinvolk.io> X-Mailer: git-send-email 2.13.6 In-Reply-To: <20180122162452.8756-1-alban@kinvolk.io> References: <20180122162452.8756-1-alban@kinvolk.io> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Alban Crequy This new fs_type flag FS_IMA_NO_CACHE means files should be re-measured, re-appraised and re-audited each time. Cached integrity results should not be used. It is useful in FUSE because the userspace FUSE process can change the underlying files at any time without notifying the kernel. Cc: linux-kernel@vger.kernel.org Cc: linux-integrity@vger.kernel.org Cc: linux-security-module@vger.kernel.org Cc: linux-fsdevel@vger.kernel.org Cc: Miklos Szeredi Cc: Alexander Viro Cc: Mimi Zohar Cc: Dmitry Kasatkin Cc: James Morris Cc: "Serge E. Hallyn" Cc: Seth Forshee Cc: Christoph Hellwig Tested-by: Dongsu Park Signed-off-by: Alban Crequy --- fs/fuse/inode.c | 2 +- include/linux/fs.h | 1 + 2 files changed, 2 insertions(+), 1 deletion(-) diff --git a/fs/fuse/inode.c b/fs/fuse/inode.c index 624f18bbfd2b..0a9e516461d5 100644 --- a/fs/fuse/inode.c +++ b/fs/fuse/inode.c @@ -1205,7 +1205,7 @@ static void fuse_kill_sb_anon(struct super_block *sb) static struct file_system_type fuse_fs_type = { .owner = THIS_MODULE, .name = "fuse", - .fs_flags = FS_HAS_SUBTYPE, + .fs_flags = FS_HAS_SUBTYPE | FS_IMA_NO_CACHE, .mount = fuse_mount, .kill_sb = fuse_kill_sb_anon, }; diff --git a/include/linux/fs.h b/include/linux/fs.h index 511fbaabf624..ced841ba6701 100644 --- a/include/linux/fs.h +++ b/include/linux/fs.h @@ -2075,6 +2075,7 @@ struct file_system_type { #define FS_BINARY_MOUNTDATA 2 #define FS_HAS_SUBTYPE 4 #define FS_USERNS_MOUNT 8 /* Can be mounted by userns root */ +#define FS_IMA_NO_CACHE 16 /* Force IMA to re-measure, re-appraise, re-audit files */ #define FS_RENAME_DOES_D_MOVE 32768 /* FS will handle d_move() during rename() internally. */ struct dentry *(*mount) (struct file_system_type *, int, const char *, void *); -- 2.13.6