From patchwork Tue Jul 24 14:19:36 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Chris Wilson X-Patchwork-Id: 10542231 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 9E091112B for ; Tue, 24 Jul 2018 14:19:51 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 8E30428B4C for ; Tue, 24 Jul 2018 14:19:51 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 8CBAF28B91; Tue, 24 Jul 2018 14:19:51 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-5.2 required=2.0 tests=BAYES_00,MAILING_LIST_MULTI, RCVD_IN_DNSWL_MED autolearn=ham version=3.3.1 Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) (using TLSv1.2 with cipher DHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id 2336E28B4C for ; Tue, 24 Jul 2018 14:19:51 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 646986E2E5; Tue, 24 Jul 2018 14:19:50 +0000 (UTC) X-Original-To: intel-gfx@lists.freedesktop.org Delivered-To: intel-gfx@lists.freedesktop.org Received: from fireflyinternet.com (mail.fireflyinternet.com [109.228.58.192]) by gabe.freedesktop.org (Postfix) with ESMTPS id ABBF06E2E5 for ; Tue, 24 Jul 2018 14:19:48 +0000 (UTC) X-Default-Received-SPF: pass (skip=forwardok (res=PASS)) x-ip-name=78.156.65.138; Received: from haswell.alporthouse.com (unverified [78.156.65.138]) by fireflyinternet.com (Firefly Internet (M1)) with ESMTP id 12448320-1500050 for multiple; Tue, 24 Jul 2018 15:19:38 +0100 From: Chris Wilson To: intel-gfx@lists.freedesktop.org Date: Tue, 24 Jul 2018 15:19:36 +0100 Message-Id: <20180724141936.18916-1-chris@chris-wilson.co.uk> X-Mailer: git-send-email 2.18.0 In-Reply-To: <20180724134046.6436-1-chris@chris-wilson.co.uk> References: <20180724134046.6436-1-chris@chris-wilson.co.uk> MIME-Version: 1.0 Subject: [Intel-gfx] [PATCH v2] drm/i915: Protect guc_fini_wq() against module load abort X-BeenThere: intel-gfx@lists.freedesktop.org X-Mailman-Version: 2.1.23 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" X-Virus-Scanned: ClamAV using ClamSMTP Prevent [ 397.873143] general protection fault: 0000 [#1] PREEMPT SMP PTI [ 397.873154] CPU: 4 PID: 4799 Comm: drv_module_relo Tainted: G U 4.18.0-rc6-CI-CI_DRM_4534+ #1 [ 397.873162] Hardware name: Micro-Star International Co., Ltd. MS-7B54/Z370M MORTAR (MS-7B54), BIOS 1.10 12/28/2017 [ 397.873175] RIP: 0010:__lock_acquire+0xf6/0x1b50 [ 397.873179] Code: 85 c0 4c 8b 9d 40 ff ff ff 8b 8d 38 ff ff ff 44 8b 8d 30 ff ff ff 4c 8b 85 28 ff ff ff 44 8b 95 24 ff ff ff 0f 84 54 03 00 00 ff 80 38 01 00 00 8b 15 45 8c 59 02 45 8b bc 24 70 08 00 00 85 [ 397.873240] RSP: 0018:ffffc90000497b40 EFLAGS: 00010002 [ 397.873246] RAX: 6b6b6b6b6b6b6b6b RBX: 0000000000000001 RCX: 0000000000000000 [ 397.873252] RDX: 0000000000000046 RSI: 0000000000000000 RDI: 0000000000000000 [ 397.873258] RBP: ffffc90000497c20 R08: ffffffff810a25e9 R09: 0000000000000000 [ 397.873264] R10: 0000000000000000 R11: ffff880255c63c28 R12: ffff8801093b2840 [ 397.873270] R13: 0000000000000001 R14: 0000000000000001 R15: 0000000000000246 [ 397.873277] FS: 00007faf88d71980(0000) GS:ffff880266300000(0000) knlGS:0000000000000000 [ 397.873284] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 397.873289] CR2: 000055d866c9ca10 CR3: 000000025472e006 CR4: 00000000003606e0 [ 397.873295] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 397.873301] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 397.873308] Call Trace: [ 397.873318] ? lock_acquire+0xa6/0x210 [ 397.873323] lock_acquire+0xa6/0x210 [ 397.873331] ? drain_workqueue+0x19/0x180 [ 397.873339] __mutex_lock+0x89/0x980 [ 397.873346] ? drain_workqueue+0x19/0x180 [ 397.873352] ? _raw_spin_unlock_irqrestore+0x4c/0x60 [ 397.873359] ? trace_hardirqs_on_caller+0xe0/0x1b0 [ 397.873365] ? drain_workqueue+0x19/0x180 [ 397.873373] ? debug_object_active_state+0x127/0x150 [ 397.873381] ? drain_workqueue+0x19/0x180 [ 397.873387] drain_workqueue+0x19/0x180 [ 397.873395] destroy_workqueue+0x12/0x1f0 [ 397.873476] intel_guc_fini_misc+0x36/0x90 [i915] [ 397.873540] i915_gem_fini+0x91/0x100 [i915] [ 397.873588] i915_driver_unload+0xd2/0x110 [i915] [ 397.873638] i915_pci_remove+0x19/0x30 [i915] [ 397.873646] pci_device_remove+0x36/0xb0 [ 397.873653] device_release_driver_internal+0x185/0x250 [ 397.873660] driver_detach+0x35/0x70 [ 397.873668] bus_remove_driver+0x53/0xd0 [ 397.873675] pci_unregister_driver+0x25/0xa0 [ 397.873683] __se_sys_delete_module+0x162/0x210 [ 397.873691] ? do_syscall_64+0xd/0x190 [ 397.873697] do_syscall_64+0x55/0x190 [ 397.873704] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 397.873710] RIP: 0033:0x7faf884231b7 [ 397.873714] Code: 73 01 c3 48 8b 0d d1 8c 2c 00 f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 b8 b0 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d a1 8c 2c 00 f7 d8 64 89 01 48 [ 397.873775] RSP: 002b:00007ffda4e98cf8 EFLAGS: 00000206 ORIG_RAX: 00000000000000b0 [ 397.873784] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007faf884231b7 [ 397.873790] RDX: 0000000000000000 RSI: 0000000000000800 RDI: 000055fbb18f1bd8 [ 397.873796] RBP: 000055fbb18f1b70 R08: 000055fbb18f1bdc R09: 00007ffda4e98d38 [ 397.873802] R10: 00007ffda4e97cf4 R11: 0000000000000206 R12: 000055fbb0d32470 [ 397.873808] R13: 00007ffda4e992e0 R14: 0000000000000000 R15: 0000000000000000 v2: It's use-after-free; not a NULL pointer. Testcase: igt/drv_module_reload/basic-reload-inject Signed-off-by: Chris Wilson Cc: Michał Winiarski Cc: Michal Wajdeczko --- drivers/gpu/drm/i915/intel_guc.c | 12 +++++++----- 1 file changed, 7 insertions(+), 5 deletions(-) diff --git a/drivers/gpu/drm/i915/intel_guc.c b/drivers/gpu/drm/i915/intel_guc.c index 846d693ecb53..3082d7670f05 100644 --- a/drivers/gpu/drm/i915/intel_guc.c +++ b/drivers/gpu/drm/i915/intel_guc.c @@ -128,13 +128,15 @@ static int guc_init_wq(struct intel_guc *guc) static void guc_fini_wq(struct intel_guc *guc) { - struct drm_i915_private *dev_priv = guc_to_i915(guc); + struct workqueue_struct *wq; - if (HAS_LOGICAL_RING_PREEMPTION(dev_priv) && - USES_GUC_SUBMISSION(dev_priv)) - destroy_workqueue(guc->preempt_wq); + wq = fetch_and_zero(&guc->preempt_wq); + if (wq) + destroy_workqueue(wq); - destroy_workqueue(guc->log.relay.flush_wq); + wq = fetch_and_zero(&guc->log.relay.flush_wq); + if (wq) + destroy_workqueue(wq); } int intel_guc_init_misc(struct intel_guc *guc)