From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from outgoing.mit.edu (outgoing-auth-1.mit.edu [18.9.28.11]) (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 6EC3E37F8A2 for ; Sun, 29 Mar 2026 17:06:59 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=18.9.28.11 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1774804021; cv=none; b=Kx1YD6M8Bsbwo8eW5alFtc2XqGkVbwDj+/mcKAttYNNX2Rf/e1MQGlj2yNdyKuvUIqLw9KOSl+vab1gFHZGNjzEbhEu/WAEtBzu6S1OA64nOqtlRZ0U0U3ce2lCMMpfe1dUCPv9BbwuHPUP9Igotw0I8PXJo7AY2oVS4DwHijg0= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1774804021; c=relaxed/simple; bh=UT7eYA1DAfyZ9kc0PKPVu99sXCkmWhn+btoKnOXosLM=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=dP98IfFfa8vy1aQNNvUsFWM5VJSQEgCN2o6IxC07jG9m6NNoL621f7rCjkkTkuJnxE18vZEN4BqhghdcgAMi73OG3jabPzXDu9sevc/8Ck09eoySrJQ5BQdCj8ibitUwZ6Cj0Qj0eGUafKEbyMB/XduLAP2GEZiXgN+8ccrdUPg= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=mit.edu; spf=pass smtp.mailfrom=mit.edu; dkim=pass (2048-bit key) header.d=mit.edu header.i=@mit.edu header.b=Bozc1XtX; arc=none smtp.client-ip=18.9.28.11 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=mit.edu Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=mit.edu Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=mit.edu header.i=@mit.edu header.b="Bozc1XtX" Received: from macsyma.thunk.org ([63.70.0.78]) (authenticated bits=0) (User authenticated as tytso@ATHENA.MIT.EDU) by outgoing.mit.edu (8.14.7/8.12.4) with ESMTP id 62TH6mth011528 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Sun, 29 Mar 2026 13:06:49 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=mit.edu; s=outgoing; t=1774804011; bh=yC0hGqqrUOinlM8lKjqHeq6W5zc6ZdOqXUQZICiRC3U=; h=Date:From:Subject:Message-ID:MIME-Version:Content-Type; b=Bozc1XtXudFINihkWF00AOFaDpBmvZNFnWqYgnSqkktVkv5D4ucvhjfcnsDJoeZn+ qoxs+WGjxv3/7kZDSng1h3U8ZiZ0MLBwEIWTott/uJEtx7z6a9mtDVR+cbWPNPXBFw WhI7kKxVUvcPXz+eM8S6f8aYq/TqgiUyhDNCGnv+BUc+ROXfTmXgAo86oI7zS7WOLS +S7eK3Q8ZyvDcCym2XA3Xziqd0qF+o5UMz3S86NBTCWjD/Gq1j7h9KXZyFkEBE/wtM pKRSOGsiEm40RczJ4RUr/HOffhWx9Wosxh+1qT62ocCGKt+gMpgygKsHfdSljBgcFX 2mX17VaQ/ck2w== Received: by macsyma.thunk.org (Postfix, from userid 15806) id EEC4E5FEC43B; Sun, 29 Mar 2026 12:06:17 -0500 (CDT) Date: Sun, 29 Mar 2026 12:06:17 -0500 From: "Theodore Tso" To: Deepanshu Kartikey Cc: Dmitry Vyukov , syzkaller@googlegroups.com, adilger.kernel@dilger.ca, linux-ext4@vger.kernel.org, linux-kernel@vger.kernel.org, syzbot+fb32afec111a7d61b939@syzkaller.appspotmail.com Subject: Re: SYZKALLER BUG: messing with a mounted file system via loop ioctls (was: Re: [PATCH] ext4: add bounds check in ext4_xattr_ibody_get() to) prevent out-of-bounds access Message-ID: <20260329170617.GA22278@macsyma.local> References: <20260224231429.31361-1-kartikey406@gmail.com> <20260326054718.GC4383@macsyma.local> <20260327163135.GE4383@macsyma.local> <20260329134832.GA8782@Mac> Precedence: bulk X-Mailing-List: linux-ext4@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: On Sun, Mar 29, 2026 at 08:09:00PM +0530, Deepanshu Kartikey wrote: > > Thanks for the sketch. I'll look into turning this into a proper > patch, exporting bdev_writes_blocked() and fixing up the > LOOP_SET_STATUS path. Thank you! Much appreciated!! - Ted