From mboxrd@z Thu Jan 1 00:00:00 1970 Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.remote-ip=100.103.45.18 ARC-Seal: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; cv=none; t=1794537229; b=nbw9vOIMKC/9RRSp2ExDnxBPf4CUOh7WTOo0dPAAmB0LFuYNSiw/IRdf1k8bACH4wvfd E/42xOAQfrnFBdBtJv/mHpzyBvePw7rx7A03c+Jk0CPLDc9tvgmcQLQGlHt6gOcsdeWuf c6fbpPWiWqnaPEmnywsxVg5rBR+LlOYxhP55GZXlydOosJCoRT5e8v/HvYLWZfZM9kVBx GYEYM2sCfX9jbIEG8S59q/dFk+rhbB3UeVTVvcupCjQ6J2pe7DL34QdN47uv+qsyMvJ9f vChZT/R1TDIg5DAYhqhyxOZjJqqCjTll8ddCFVrTxQYPg4SCETiLk1GE1+bm6TgjbhA== ARC-Message-Signature: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; c=relaxed/relaxed; t=1794537229; h=Received:DKIM-Signature:From:To:Cc:Subject:Date:Message-ID:X-Mailer: In-Reply-To:References:MIME-Version:Content-Transfer-Encoding; bh=8yNaL1Ds4jqJnc35H72MqYm7Qrv9lxSIrL/fpuBv0nM=; b=0rofPOfIKEiVkv/KHLbRS0xhCCu/1eFmD7Fst0VWxDFJtWTecID7xX0XVPXN/5VsT595 nrBYF30j3NgGK9NlaN1A52Lz+cI0N5mkg1KCdqY4vpnJC9PnxOjZPelOYnTvQ2LwssClR /guAlYbI23CLUyi5YxFFv1ZzX/CUrT6iwuztUUDZ1Ss1YmmH3r5BZpa5u0UEizQLYqdx+ 5K7CGVIOTRM63ZszY2E/tMdbQM9phnHyIcbYTbG13i6tuKtRUbAh7DzTgt35T3OzDQ44y J0Sl8Pd77U6PLMeFdTgnyMEKLtkqlN0TFvXD8BwFXUED6OY8DyRcDqWIX0rz9lW2x6A== ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass header.d=kernel.org header.i=@kernel.org header.a=rsa-sha256 header.s=k20260515 header.b=YMZFV2xS; arc=none smtp.remote-ip=100.103.45.18 Received: from smtp.kernel.org (quasi.space.kernel.org [100.103.45.18]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (prime256v1)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 85325606A335 for ; Fri, 13 Nov 2026 02:33:49 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.a=rsa-sha256 header.s=k20260515 header.b=YMZFV2xS Received: by smtp.kernel.org (Postfix) with ESMTPSA id 888B11F000C7; Fri, 13 Nov 2026 02:33:48 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1794537229; bh=8yNaL1Ds4jqJnc35H72MqYm7Qrv9lxSIrL/fpuBv0nM=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=YMZFV2xSSA81WDE/ZsgqRBQx22sUJWh7DxssTmHibUeIkKDt3wh/DPxUM8hTBoWts XoC8I5A6OWr8s7vDNqEGf/Q0Ou2o8zRfYsIW4QhGhfcHxPhT4UWZTVES7jOop5WCzv AmZ+qN9Qv8whPRX9oHWjgW5vaz8A7zYxyu9Yz+MuvvVO6eNulktX1VrrwLPWOUu8Cr gRTicSrvtMU5Gw8+WS0r+CZ8vMiZq7gEZj1s+w+BEmas6Q1DsOdTMr6KvBMzr2mupJ ZJhn53uKB/uwXZDs5ZwzSVbWLbBSmFOuRxT4g9vN8v2DCnlpVdXhEwPFi+Xp8Hdt2Y Qd1rRuQurJehg== From: Sasha Levin To: stable@vger.kernel.org Cc: Sasha Levin , amir73il@gmail.com, mason@kernel.org, Hungyu Lin Subject: Re: [PATCH 6.18.y v2] ovl: fail the mount if the casefold flag has changed Date: Thu, 12 Nov 2026 21:33:28 -0500 Message-ID: X-Mailer: git-send-email 2.53.0 In-Reply-To: <20261112122500.6344-1-dennylin0707@gmail.com> References: <20261112122500.6344-1-dennylin0707@gmail.com> X-Mailing-List: stable@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Transfer-Encoding: 8bit On 2026-11-12, Hungyu Lin wrote: > [PATCH 6.18.y v2] ovl: fail the mount if the casefold flag has changed > An unprivileged user in a user namespace can repeatedly trigger a kernel > warning with their own overlay mounts. They do so by changing the > casefold flag of the topmost layer's empty root, the top directory of Queued for 6.18, thanks. -- Thanks, Sasha