From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mgamail.intel.com (mgamail.intel.com [192.198.163.16]) (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 DABED1EB5CE; Sat, 15 Aug 2026 08:58:08 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=192.198.163.16 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1786784291; cv=none; b=HWoHPpx5DxsG5ANuVggfSfmlyzZpQgHDqi+EzPd/TBbkrSqPuQ3mQpvE8noWWmmI3bTBp1Bsnk/69JKY5gAdGuDnVrHQraN5vSjl+gH50fO2q0AAjnKZNILCOVoG4mcGzKOIxlEmC04QomoE4qCnmM2D9nXDdbsiWexSzKW/lIY= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1786784291; c=relaxed/simple; bh=83rVzdc43/8GHpNstu2sZht933k01ghuS0VejBxZSVg=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=MXTKa0k+Ge6M63QYtn92niiWYEOnWfyvbFPuGoh3TJEj+ggbH74br9YpoUjSQQ9HOQK/ETYGziaGJFL5rxa+9ZHs8Hs3GysPrxKIqjc9Pae7dRErZW0Muz8Whmr5qJ01iV/PtiJ7ZYm26Rq9OU1b9aN36Tif0M4Cd93UxOscupk= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.intel.com; spf=pass smtp.mailfrom=linux.intel.com; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b=Vl1OsyXd; arc=none smtp.client-ip=192.198.163.16 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.intel.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linux.intel.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b="Vl1OsyXd" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1786784289; x=1818320289; h=date:from:to:cc:subject:message-id:references: mime-version:in-reply-to; bh=83rVzdc43/8GHpNstu2sZht933k01ghuS0VejBxZSVg=; b=Vl1OsyXdqh6dQ45u6L5QIvtooIfayjY2hZXMkBnO43b4PrdBBkT9MpJe BwGBaaH7DmaQHy3OFdR6VUEqQ2j2L68LPDaI+BixzK2GnNqUDx0K3L04b 1azUZ6fXWaSaRDekeksAolytGyi1pid7uMrKLvhXEavz+0dbBCOL+m7Q1 UFPq3P9jWgO0RSB5MT94hVhaZIEGDLoZV0zqXxmcNXeVyCKE7MeRV5gL9 nNFrCPY6oseKpFjoNQiWSFcj8GmUkRvk0y8YOt7SCIU8NxZ5EtPNoaLBr V8m5lYGO8V/JcRYgZKZvhLDMGXOf6YD2rerv9G1WvYZd+g9NITTVu2so3 g==; X-CSE-ConnectionGUID: hnftVAsOQPiiArceO2mEPQ== X-CSE-MsgGUID: HpugK26aRyao2s+WIorTiA== X-IronPort-AV: E=McAfee;i="6800,10657,11875"; a="74880130" X-IronPort-AV: E=Sophos;i="6.25,224,1779174000"; d="scan'208";a="74880130" Received: from orviesa006.jf.intel.com ([10.64.159.146]) by fmvoesa110.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 15 Aug 2026 01:58:08 -0700 X-CSE-ConnectionGUID: Px/3JtpTQZ60BRBsGld8xg== X-CSE-MsgGUID: EilQOjN2Q8GYgk8GmAABfw== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.25,224,1779174000"; d="scan'208";a="262662014" Received: from ettammin-mobl3.ger.corp.intel.com (HELO localhost) ([10.245.245.12]) by orviesa006-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 15 Aug 2026 01:58:06 -0700 Date: Sat, 15 Aug 2026 11:58:03 +0300 From: Andy Shevchenko To: Sebastian Andrzej Siewior Cc: linux-kernel@vger.kernel.org, linux-hardening@vger.kernel.org, Andrew Morton , Kees Cook , Petr Mladek , Rasmus Villemoes , Sergey Senozhatsky , Steven Rostedt , Tycho Andersen Subject: Re: [PATCH 1/2] vsprintf: Don't leak pointers for %ps without KALLSYMS enabled Message-ID: References: <20260814144854.746840-1-bigeasy@linutronix.de> <20260814144854.746840-2-bigeasy@linutronix.de> Precedence: bulk X-Mailing-List: linux-hardening@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: <20260814144854.746840-2-bigeasy@linutronix.de> Organization: Intel Finland Oy - BIC 0357606-4 - c/o Alberga Business Park, 6 krs, Bertel Jungin Aukio 5, 02600 Espoo On Fri, Aug 14, 2026 at 04:48:53PM +0200, Sebastian Andrzej Siewior wrote: > The "%ps" format modifier prints the name of the symbol which is more > valuable in terms of debugging and does not leak the actual pointer. > > Without KALLSYMS it will leak the pointer which is not intended. The > default policy for pointers is to print a hashed value and not to leak > the actual pointer. > > Print "(unknown)" for any symbol resolution witout KALLSYMS enabled. Hmm... I would expect some test cases to be added/modified. -- With Best Regards, Andy Shevchenko