From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id B432EC52D6D for ; Mon, 5 Aug 2024 22:30:23 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 32E0710E2CF; Mon, 5 Aug 2024 22:30:23 +0000 (UTC) Authentication-Results: gabe.freedesktop.org; dkim=pass (2048-bit key; unprotected) header.d=intel.com header.i=@intel.com header.b="gI1Bu7f9"; dkim-atps=neutral Received: from mgamail.intel.com (mgamail.intel.com [198.175.65.14]) by gabe.freedesktop.org (Postfix) with ESMTPS id DB9D210E2CF for ; Mon, 5 Aug 2024 22:30:20 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1722897021; x=1754433021; h=date:from:to:cc:subject:message-id:references: mime-version:in-reply-to; bh=e4erJZ/SSuw3QMVOEBIBfjLGRnIrMqxBSGZwTmu0Gds=; b=gI1Bu7f9NuiVKT3qfbF8kDkXlaleyQjzrAwdJkN0O1TOWX2q7fISfgxh /t0PuwHvxi+Ivd53tUUhb8eTK1S6yiVYAPciGAERXaeOnafDThScKIkMv x8a9PvKCMHLX8rIs5Hcj6QoPs9btxHArHbagARxpR0sfJEkIfkCyUrT+q b8D/AWh5Mh9iXokQl3Q/esEcYO8CAbSqlyWVy6imA8uNoSDGcMlvGrldq xmUKGWfN/TZEuXcycdi/+501KBz6OMDAsVQf2+EzDbmRQFH1s0wnafzx/ SjiXnvfO3EGDGYFJ/KFvrrkZW0Fssvvkhje2m2rb4uma+JcLf4TrdsPsx A==; X-CSE-ConnectionGUID: fuYZqplySuaiqdKF4GG+sQ== X-CSE-MsgGUID: 9r5rfBvWSp2tOnIUDpXAMA== X-IronPort-AV: E=McAfee;i="6700,10204,11155"; a="24677708" X-IronPort-AV: E=Sophos;i="6.09,265,1716274800"; d="scan'208";a="24677708" Received: from fmviesa008.fm.intel.com ([10.60.135.148]) by orvoesa106.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 05 Aug 2024 15:30:20 -0700 X-CSE-ConnectionGUID: ZTIZ4ICfTxGiNQyQ/8a9Ag== X-CSE-MsgGUID: aSW5G5PnSWyOWRbDXb8dfA== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.09,265,1716274800"; d="scan'208";a="56235816" Received: from pgcooper-mobl3.ger.corp.intel.com (HELO intel.com) ([10.245.244.45]) by fmviesa008-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 05 Aug 2024 15:30:18 -0700 Date: Mon, 5 Aug 2024 23:30:14 +0100 From: Andi Shyti To: Krzysztof Niemiec Cc: intel-gfx@lists.freedesktop.org, Andi Shyti Subject: Re: [PATCH] drm/i915/gt: Delete sysfs entries for engines on driver unload Message-ID: References: <20240801154047.115176-2-krzysztof.niemiec@intel.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: X-BeenThere: intel-gfx@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Intel graphics driver community testing & development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: intel-gfx-bounces@lists.freedesktop.org Sender: "Intel-gfx" On Mon, Aug 05, 2024 at 05:46:06PM +0200, Krzysztof Niemiec wrote: > On 2024-08-01 at 17:40:48 GMT, Krzysztof Niemiec wrote: > > While the sysfs entries for engines are added in intel_engines_init() > > during driver load, the corresponding function intel_engines_release() > > does not correctly get rid of them. This can lead to a UAF if, after > > failed initialization (for example when gt is set wedged on init), we > > try to access the engines. > > > > Empty the engines llist in intel_engines_release(). > > > > Suggested-by: Chris Wilson > > Signed-off-by: Krzysztof Niemiec ... > drm/i915/gt: Empty uabi engines list during intel_engines_release() > > While the uabi_engines_llist is populated in intel_engines_init() during > driver load, the corresponding function intel_engines_release() does not > correctly get rid of it. This can lead to a UAF if, after failed > initialization (for example when gt is set wedged on init), we try to > access the engines. Pushed to drm-intel-gt-next with the updated commit. Thanks, Andi