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 8244D2FBE03; Thu, 13 Nov 2025 17:37:55 +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=1763055475; cv=none; b=GAQGcqlDGvZ7R/7KJshr9mMXeZyLCrkA1emceM1wgMEojOAVmJQ6kbd3XVn46lXQ9qPZ8Y6v5gw0YNIxkzVoGfp1tGe6douLHh13kGeJVT/VPOTVEOQeHiO7VxM60xje2lxVZTmd4CQgQgs+0jM517E4I3oI7xbIrqRUM94rHO0= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1763055475; c=relaxed/simple; bh=7NoJsLrTm7q393HteHKSsPD9r5KzwyUm+Fi+IaGWKfA=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=PVMid6PpDLDovkWIpzL+/+a4snujXQad8CJfgbrTKo9hXApLioJADpfxxg+Q28oO63yctP7oIdtgjNkJTHJaEFjxn1I1uy7npyxk5REQGF2AYB72NmoPSx5csrCblkRt79eAtBSgJwe6VS1jQQXWq1zEt0QTIBWm91odVhKCrvs= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=RskdFXwN; 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="RskdFXwN" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 14636C19421; Thu, 13 Nov 2025 17:37:55 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1763055475; bh=7NoJsLrTm7q393HteHKSsPD9r5KzwyUm+Fi+IaGWKfA=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=RskdFXwNKpKbQCN7US841dmtrVnR8BdCN/9u+RAW3SUnK2ig9FlmSSidYyktV8XXu TiMpaqNmMKMdXUQ53qlNU7Klyhuge2C5Zo/RkBb10HnpITgoNQtAhCO/3Fs7nn6mu5 zOZnQE1d2AZLQiqfwta3dDg3DN0lKZ0mpBpVcJUySKL/IMuGZspTKVeApwkJyYKqxi Y5f5/W86IwS447VSLNpGXfUr/xwINU8FYvYOnoMRM6/zQY49amLFDSZ9B5xGfNqiJQ wcxMhZbBMvjWJUEZNihkabgTL/ywOtDUwuMLzy/K6wXAlQAS6W/JZ4RFOfH9pU21Sd 5a+wy5/YXjvsw== Date: Thu, 13 Nov 2025 12:37:53 -0500 From: Greg Kroah-Hartman To: David Sterba Cc: cve@kernel.org, linux-kernel@vger.kernel.org, linux-cve-announce@vger.kernel.org Subject: Re: CVE-2025-40128: btrfs: fix symbolic link reading when bs > ps Message-ID: <2025111342-maroon-untouched-02a8@gregkh> References: <2025111253-CVE-2025-40128-2dd9@gregkh> <20251113104008.GM13846@twin.jikos.cz> Precedence: bulk X-Mailing-List: linux-kernel@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: <20251113104008.GM13846@twin.jikos.cz> On Thu, Nov 13, 2025 at 11:40:08AM +0100, David Sterba wrote: > On Wed, Nov 12, 2025 at 07:24:04PM +0900, Greg Kroah-Hartman wrote: > > From: Greg Kroah-Hartman > > > > Description > > =========== > > > > In the Linux kernel, the following vulnerability has been resolved: > > > > btrfs: fix symbolic link reading when bs > ps > > > > [BUG DURING BS > PS TEST] > > When running the following script on a btrfs whose block size is larger > > than page size, e.g. 8K block size and 4K page size, it will trigger a > > kernel BUG: > > > > # mkfs.btrfs -s 8k $dev > > # mount $dev $mnt > > # mkdir $mnt/dir > > # ln -s dir $mnt/link > > # ls $mnt/link > > Please drop the CVE status from this patch, the bs > ps (block size > bigger than page size) feature requires CONFIG_BTRFS_EXPERIMENTAL and is > unfinished and possibly unstable in other use cases. It does not make > sense to improve security where none should be expected. Oops, good catch, now rejected, thanks for the review! greg k-h