From patchwork Tue Apr 16 03:55:01 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Dixit, Ashutosh" X-Patchwork-Id: 13631177 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 2DD6CC4345F for ; Tue, 16 Apr 2024 03:55:16 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id A4C201129D1; Tue, 16 Apr 2024 03:55:10 +0000 (UTC) Authentication-Results: gabe.freedesktop.org; dkim=pass (2048-bit key; unprotected) header.d=intel.com header.i=@intel.com header.b="SaYbIhxS"; dkim-atps=neutral Received: from mgamail.intel.com (mgamail.intel.com [192.198.163.11]) by gabe.freedesktop.org (Postfix) with ESMTPS id 11E7A1129C2; Tue, 16 Apr 2024 03:55:08 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1713239709; x=1744775709; h=from:to:cc:subject:date:message-id:mime-version: content-transfer-encoding; bh=mn0gisJNrsD7GRbKuZiSaG2WypB8+MdvqgCCZc6EMbs=; b=SaYbIhxSSogN6EVbu98tcTcnG2qi+RgQAfYcyYG8LIKPAMK9Wjwi8d/e jQPwuCwlVDiDaEOXhOG4/iJ0y8u024EnNtoJthAI++rW/zqopF20ecifx 7zKb7ri9FOjKwrad0Lz92G0gMKJayvSvTuQAMA4ezqeByRhhUsmf1ig6l GVz90MMl0lMZ2lZqlRPzfhKX82nl5rPnBzFB0c4rhcxe6km1gO0AkVxY+ E89kcaGzXTCyfs2RP9VoLiDTztEC5qNrmBmMf6Xydp/d1W3r6fHElh/// dqzcGcEU2OGbGsrF/rnwq7nyZhOliFQSvwIYy27RNaFfdzPSK3LC9k2bl g==; X-CSE-ConnectionGUID: tFOlcROnRGmVGvnX53/3Lg== X-CSE-MsgGUID: rjvdu+AjS6e+mH9OY6r1kA== X-IronPort-AV: E=McAfee;i="6600,9927,11045"; a="19260319" X-IronPort-AV: E=Sophos;i="6.07,204,1708416000"; d="scan'208";a="19260319" Received: from orviesa005.jf.intel.com ([10.64.159.145]) by fmvoesa105.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 15 Apr 2024 20:55:08 -0700 X-CSE-ConnectionGUID: tMW3Qk2KRWmjrlIyQCAXjw== X-CSE-MsgGUID: 4CMleALOTWyOBrpC+HkLGA== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.07,204,1708416000"; d="scan'208";a="26917438" Received: from orsosgc001.jf.intel.com ([10.165.21.138]) by orviesa005-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 15 Apr 2024 20:55:08 -0700 From: Ashutosh Dixit To: intel-gfx@lists.freedesktop.org Cc: Badal Nilawar , Andi Shyti , =?utf-8?b?VmlsbGUgU3lyasOkbMOk?= , linux-hwmon@vger.kernel.org, dri-devel@lists.freedesktop.org Subject: [PATCH] drm/i915/hwmon: Get rid of devm Date: Mon, 15 Apr 2024 20:55:01 -0700 Message-ID: <20240416035501.755728-1-ashutosh.dixit@intel.com> X-Mailer: git-send-email 2.41.0 MIME-Version: 1.0 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" When both hwmon and hwmon drvdata (on which hwmon depends) are device managed resources, the expectation, on device unbind, is that hwmon will be released before drvdata. However, in i915 there are two separate code paths, which both release either drvdata or hwmon and either can be released before the other. These code paths (for device unbind) are as follows (see also the bug referenced below): Call Trace: release_nodes+0x11/0x70 devres_release_group+0xb2/0x110 component_unbind_all+0x8d/0xa0 component_del+0xa5/0x140 intel_pxp_tee_component_fini+0x29/0x40 [i915] intel_pxp_fini+0x33/0x80 [i915] i915_driver_remove+0x4c/0x120 [i915] i915_pci_remove+0x19/0x30 [i915] pci_device_remove+0x32/0xa0 device_release_driver_internal+0x19c/0x200 unbind_store+0x9c/0xb0 and Call Trace: release_nodes+0x11/0x70 devres_release_all+0x8a/0xc0 device_unbind_cleanup+0x9/0x70 device_release_driver_internal+0x1c1/0x200 unbind_store+0x9c/0xb0 This means that in i915, if use devm, we cannot gurantee that hwmon will always be released before drvdata. Which means that we have a uaf if hwmon sysfs is accessed when drvdata has been released but hwmon hasn't. The only way out of this seems to be do get rid of devm_ and release/free everything explicitly during device unbind. v2: Change commit message and other minor code changes v3: Cleanup from i915_hwmon_register on error (Armin Wolf) Closes: https://gitlab.freedesktop.org/drm/intel/-/issues/10366 Signed-off-by: Ashutosh Dixit --- drivers/gpu/drm/i915/i915_hwmon.c | 54 ++++++++++++++++++++++--------- 1 file changed, 38 insertions(+), 16 deletions(-) diff --git a/drivers/gpu/drm/i915/i915_hwmon.c b/drivers/gpu/drm/i915/i915_hwmon.c index b758fd110c20..8cebf6f5b101 100644 --- a/drivers/gpu/drm/i915/i915_hwmon.c +++ b/drivers/gpu/drm/i915/i915_hwmon.c @@ -793,7 +793,7 @@ void i915_hwmon_register(struct drm_i915_private *i915) if (!IS_DGFX(i915)) return; - hwmon = devm_kzalloc(dev, sizeof(*hwmon), GFP_KERNEL); + hwmon = kzalloc(sizeof(*hwmon), GFP_KERNEL); if (!hwmon) return; @@ -819,14 +819,12 @@ void i915_hwmon_register(struct drm_i915_private *i915) hwm_get_preregistration_info(i915); /* hwmon_dev points to device hwmon */ - hwmon_dev = devm_hwmon_device_register_with_info(dev, ddat->name, - ddat, - &hwm_chip_info, - hwm_groups); - if (IS_ERR(hwmon_dev)) { - i915->hwmon = NULL; - return; - } + hwmon_dev = hwmon_device_register_with_info(dev, ddat->name, + ddat, + &hwm_chip_info, + hwm_groups); + if (IS_ERR(hwmon_dev)) + goto err; ddat->hwmon_dev = hwmon_dev; @@ -839,16 +837,40 @@ void i915_hwmon_register(struct drm_i915_private *i915) if (!hwm_gt_is_visible(ddat_gt, hwmon_energy, hwmon_energy_input, 0)) continue; - hwmon_dev = devm_hwmon_device_register_with_info(dev, ddat_gt->name, - ddat_gt, - &hwm_gt_chip_info, - NULL); - if (!IS_ERR(hwmon_dev)) - ddat_gt->hwmon_dev = hwmon_dev; + hwmon_dev = hwmon_device_register_with_info(dev, ddat_gt->name, + ddat_gt, + &hwm_gt_chip_info, + NULL); + if (IS_ERR(hwmon_dev)) + goto err; + + ddat_gt->hwmon_dev = hwmon_dev; } + return; +err: + i915_hwmon_unregister(i915); } void i915_hwmon_unregister(struct drm_i915_private *i915) { - fetch_and_zero(&i915->hwmon); + struct i915_hwmon *hwmon = fetch_and_zero(&i915->hwmon); + struct hwm_drvdata *ddat = &hwmon->ddat; + struct intel_gt *gt; + int i; + + if (!hwmon) + return; + + for_each_gt(gt, i915, i) { + struct hwm_drvdata *ddat_gt = hwmon->ddat_gt + i; + + if (ddat_gt->hwmon_dev) + hwmon_device_unregister(ddat_gt->hwmon_dev); + } + + if (ddat->hwmon_dev) + hwmon_device_unregister(ddat->hwmon_dev); + + mutex_destroy(&hwmon->hwmon_lock); + kfree(hwmon); }