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 ABD4036B978 for ; Thu, 30 Oct 2025 17:40:17 +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=1761846017; cv=none; b=EBn7AQwB06t+abb6j/6xJjfuXUfLAn0uelwRVNWo/u1Vu6JDoezEsmAEDx14oHzNeQyxwfjp1TvwOedf1Yuc0k1MoCg/9ccwLB2hlJeL1ywQoSDHkf2zIIAPaRNlQfCpmTvCmTsVei9ZB3A3BWKOjiSXI9PBEpA1wPaCD5t5cZ4= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1761846017; c=relaxed/simple; bh=lMIj8+PQkZSoYivaKeiRGV2v5FbpQQ6QRml2yCrC2/8=; h=Message-ID:Subject:From:To:Cc:Date:In-Reply-To:References: Content-Type:MIME-Version; b=nKML/QgBeplbXMO9eIb0dajOJRfzEscbBJNkWpTlKGiAxIt4LTHsT9UCmRr/2TqhaYLxT0tIE661GEDk11mlOrWV0ZeEtd9W/ckPsfbq3YxfFOhKkWB400ZVdyUqRZ9/PahlqgZmPSwE2fwzBKwwiPbby2NmsaUM9eBNgz51VVg= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=IxoLIinw; 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="IxoLIinw" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 68458C4CEF1; Thu, 30 Oct 2025 17:40:16 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1761846017; bh=lMIj8+PQkZSoYivaKeiRGV2v5FbpQQ6QRml2yCrC2/8=; h=Subject:From:To:Cc:Date:In-Reply-To:References:From; b=IxoLIinwXFFEa5VNVZK7HLcgc7mOPPe1TY1VI3CqLoVZxvKg2GDNFQa+OIZ0fymcq gubAjinGATTjLFphGvgvgOqVuX46kXe5zGRVv973r92Yhqnhlfa/vcyjOGnNPR//My HWfTOJ2Qr9hhPtcUUHsUHQ4StQJXZz9QYpmv41uj1RUtbN39IukWWKiJoghZqOhGNp a1DUtt5u9d028H6UY9bZ2QLYcAji53DYGf3Zyyd2f5ZrO/O6Nc2cgYgTTby2dnmJ6U f/cF0W95anIjKiJl0OoiC+ski20genh78HMq4K0poMtfZqnmKNkQywQijTUq7Z4B7b 5vPTiWfaVSEMQ== Message-ID: <58ce03be10ba5adc2b3896e9f5872ff26a74c195.camel@kernel.org> Subject: Re: [PATCH] Add error handling to minix filesystem similar to ext4 From: Jeff Layton To: Shuah Khan , Jori Koolstra Cc: Christian Brauner , Khalid Aziz , Tetsuo Handa , Jan Kara , Taotao Chen , NeilBrown , linux-kernel@vger.kernel.org, syzbot+4e49728ec1cbaf3b91d2@syzkaller.appspotmail.com Date: Thu, 30 Oct 2025 13:40:15 -0400 In-Reply-To: References: <20251028205857.386719-1-jkoolstra@xs4all.nl> <792975039.3142581.1761826973320@kpc.webmail.kpnmail.nl> <1697efab0661c4c80831544f84c9e520f33962e7.camel@kernel.org> <1979215152.3123282.1761831106100@kpc.webmail.kpnmail.nl> <90143686.3161766.1761833369803@kpc.webmail.kpnmail.nl> <1ed30710481dd6739e6e9b4bd6f57c7c9d7e7de3.camel@kernel.org> Autocrypt: addr=jlayton@kernel.org; prefer-encrypt=mutual; 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text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable User-Agent: Evolution 3.56.2 (3.56.2-2.fc42) Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 On Thu, 2025-10-30 at 09:44 -0600, Shuah Khan wrote: > On 10/30/25 09:12, Jeff Layton wrote: > > On Thu, 2025-10-30 at 15:09 +0100, Jori Koolstra wrote: > > > >=20 > > > > I don't see a licensing issue. It's BSD licensed. Also, this is a > > > > userland code, so we wouldn't need to worry about that too much. > > > >=20 > > >=20 > > > Oh, my bad. I thought Minix (the OS) had some licensing incompatibili= ties > > > with Linux, and this repo takes code from Minix. But that may be long= in > > > the past. > > >=20 > >=20 > > Minix is BSD licensed too. That's not completely incompatible with the > > GPL, but IANAL. > >=20 > > > >=20 > > > > You're quite right though that userland replacements will need to m= eet > > > > some criteria before we can rip out the in-kernel versions. This mi= ght > > > > be a good discussion topic for next year's LSF/MM! > > >=20 > > > Would an in-tree but out of kernel implementation be an idea? Like ho= w > > > kselftest is integrated in the code, even though most of that also ta= kes > > > place in userland. That would guarantee a level of support, at least = for > > > the time being. I could take the code, verify it, and write some test= s > > > for in selftest. > > >=20 > >=20 > > That's not a bad idea. We already have some userland code in the kernel > > tree (the tools/ directory comes to mind). A directory with replacement > > FUSE drivers for in-kernel filesystems could be a reasonable thing to > > add. Anything we keep in-tree will need to be GPL-compatible though. >=20 > Jori, if you want to continue working on userland slotions and working > to initiate deprecating, working - please do.>=20 > > > And there is still the issue of what we do for the syzbot bugs until = a > > > more permanent solution is achieved. > > >=20 > >=20 > > Yeah, that's a different issue. Most likely we'll need to fix those in > > the near term. Replacing minix.ko with a FUSE fs will take time > > (years), even once we have a new driver in hand. > Does this mean Jori can work on fixing these while replacing minix.ko > with fuse progresses? >=20 Caveat: I have no real connection to minixfs. All of my contributions are drive-bys where I was changing some other vfs layer interface. I see no problem with fixing real bugs in the minixfs driver. Personally, I'd focus on things that are actual security problems -- crashes that are triggerable by non-privileged users. In this case, the problem involves a deliberately corrupted filesystem. As a community, we have deprioritized fixing these sorts of bugs. Someone with the access to mount a deliberately corrupt fs like this is in a position to crash the kernel in any number of other ways. With a legacy filesystem like this, fixing problems of this nature is usually not worth developer/reviewer time. > >=20 > > We'll need to mark the old driver deprecated and then wait a few > > releases before we can rip it out. > Jori could work on patches for deprecating perhaps? >=20 That's probably premature until we have feature-complete replacement to point users toward. > >=20 > > > Anyway, this probably goes over my head as a clueless beginner. Just > > > trying to see where I can help. Thanks a lot Jeff for you answers, I > > > appreciate it. > > >=20 > >=20 > > You're welcome. We all start out as beginners! >=20 > +1 >=20 > thanks, > -- Shuah --=20 Jeff Layton