Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932137AbbKQT1I (ORCPT ); Tue, 17 Nov 2015 14:27:08 -0500 Received: from a.ns.miles-group.at ([95.130.255.143]:11951 "EHLO radon.swed.at" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754666AbbKQT1F (ORCPT ); Tue, 17 Nov 2015 14:27:05 -0500 Subject: Re: [PATCH v3 0/7] User namespace mount updates To: Seth Forshee References: <1447778351-118699-1-git-send-email-seth.forshee@canonical.com> <20151117170556.GV22011@ZenIV.linux.org.uk> <20151117172551.GA108807@ubuntu-hedt> <20151117175506.GW22011@ZenIV.linux.org.uk> <20151117183444.GB108807@ubuntu-hedt> <20151117192141.GD108807@ubuntu-hedt> Cc: Al Viro , "Eric W. Biederman" , linux-bcache@vger.kernel.org, device-mapper development , "linux-raid@vger.kernel.org" , "linux-mtd@lists.infradead.org" , linux-fsdevel , LSM , selinux@tycho.nsa.gov, Serge Hallyn , Andy Lutomirski , LKML , "Theodore Ts'o" , Octavian Purdila From: Richard Weinberger Message-ID: <564B7F83.1050701@nod.at> Date: Tue, 17 Nov 2015 20:26:59 +0100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Thunderbird/38.4.0 MIME-Version: 1.0 In-Reply-To: <20151117192141.GD108807@ubuntu-hedt> Content-Type: text/plain; charset=windows-1252 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1773 Lines: 38 Am 17.11.2015 um 20:21 schrieb Seth Forshee: > On Tue, Nov 17, 2015 at 08:12:31PM +0100, Richard Weinberger wrote: >> On Tue, Nov 17, 2015 at 7:34 PM, Seth Forshee >> wrote: >>> On Tue, Nov 17, 2015 at 05:55:06PM +0000, Al Viro wrote: >>>> On Tue, Nov 17, 2015 at 11:25:51AM -0600, Seth Forshee wrote: >>>> >>>>> Shortly after that I plan to follow with support for ext4. I've been >>>>> fuzzing ext4 for a while now and it has held up well, and I'm currently >>>>> working on hand-crafted attacks. Ted has commented privately (to others, >>>>> not to me personally) that he will fix bugs for such attacks, though I >>>>> haven't seen any public comments to that effect. >>>> >>>> _Static_ attacks, or change-image-under-mounted-fs attacks? >>> >>> Right now only static attacks, change-image-under-mounted-fs attacks >>> will be next. >> >> Do we *really* need to enable unprivileged mounting of kernel filesystems? >> What about just enabling fuse and implement ext4 and friends as fuse >> filesystems? >> Using the approaching Linux Kernel Libary[1] this is easy. > > I haven't looked at this project, but I'm guessing that programs must be > written specifically to make use of it? I.e. you can't just use the > mount syscall, and thus all existing software still doesn't work? You can easy bridge fuse and the LKL, I did already a hacky PoC. Worked nicely. Octavian's tree has some nice examples, and AFAIK he is currently working on a "mount any kernel fs via fuse" tool. Thanks, //richard -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/