From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (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 76BF63FB051; Tue, 31 Mar 2026 15:02:42 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=198.137.202.133 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1774969364; cv=none; b=PeZa5E3Lh+TMp0Edyi0TH0jP2bsxAUrPT0EKnJxo6a35g5KAbMIDBahg4RsfGWdQFloOBwcbew3+y1S4PMLuwSNisv8SdSJnxX2YLdygZ4A+Ibzk5MdCmuqC6j3uo+CkLuFDV+esMuTAuAazEw8jonBmrkdadLsru3GXZuUJrxE= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1774969364; c=relaxed/simple; bh=TnFqPxS+nne4CNvOdZqaK21h6+DMjiAvm5cHKnlgihk=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=YjQJhEJseommB3sFG1qdebSFldO37jUFF4GSjroV9qdiCT/b56j5zBvDBS/AqBA5r+2Skszwi59IwPNeIClNIqwHRMvyakEPOhZHT46q/lsiA4c9mDYHyhP/z38zrTDmnzH7amvACRWCyrcvXjCGUSZJkZAONViT1oYvn1ijIWo= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=infradead.org; spf=none smtp.mailfrom=bombadil.srs.infradead.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b=NfaVlKpa; arc=none smtp.client-ip=198.137.202.133 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=infradead.org Authentication-Results: smtp.subspace.kernel.org; spf=none smtp.mailfrom=bombadil.srs.infradead.org Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="NfaVlKpa" DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=bombadil.20210309; h=In-Reply-To:Content-Type:MIME-Version :References:Message-ID:Subject:Cc:To:From:Date:Sender:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description; bh=WASmCAWx1UhfnKlYBZL3c+urkfeQsSetCQn2fwEVnx4=; b=NfaVlKpabFacyAs01YZ6CnLmLo RzRIY6HG0V6sl2ORkyPgai8L9Nb/vs+hFfpk9vwLFiuKEKZKeQ5aXfrFaQuBlNlYwWyrxUwcvY2Xy DIVzLLtSUHUyNYrqB98PPJUcrc8flWGEjRHzHv7AGqRuwMBif8GumfIaNbgEs8jeV87LLHcthBTva 6pgaGP0awiy4tSLrQFudx4FMjbi2GM3WOlwdStOIaXMQinrWnw5eJuhgmYrOgGVgyCExr0gETG280 XOIAJw0S5b8FqLenuWgQf/rHp/L6sbkuyiSifcw4xP4CgDdSks0xDp8KV9Gp1jf0rCQpR2RQLIk6y zWxaSpbg==; Received: from hch by bombadil.infradead.org with local (Exim 4.98.2 #2 (Red Hat Linux)) id 1w7ac4-0000000D8u0-0i6K; Tue, 31 Mar 2026 15:02:40 +0000 Date: Tue, 31 Mar 2026 08:02:40 -0700 From: Christoph Hellwig To: Theodore Tso Cc: Christoph Hellwig , Deepanshu Kartikey , axboe@kernel.dk, dvyukov@google.com, adilger.kernel@dilger.ca, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org, syzbot+fb32afec111a7d61b939@syzkaller.appspotmail.com Subject: Re: [PATCH v2] loop: block changing lo_offset/lo_sizelimit on mounted device Message-ID: References: <20260331054648.4548-1-kartikey406@gmail.com> <20260331122408.GB74409@macsyma-wired.lan> Precedence: bulk X-Mailing-List: linux-block@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20260331122408.GB74409@macsyma-wired.lan> X-SRS-Rewrite: SMTP reverse-path rewritten from by bombadil.infradead.org. See http://www.infradead.org/rpr.html On Tue, Mar 31, 2026 at 08:24:08AM -0400, Theodore Tso wrote: > Do we expect people to seriously be running with > !CONFIG_BLK_DEV_WRITE_MOUNTED? Yes, it's the only sane option. > I view this as a syzkaller noise > suppression only. As I mentioned earlier this option will very likely > break grub. Yes, the horrible things grub does won't work with this. But I thought with EFI-based systems people had mostly stopped using the access to the root file system misfeature in grub. And a lot of specialized distros seem to stop using grub entirely.