From patchwork Fri May 27 11:01:32 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Alexander Lobakin X-Patchwork-Id: 12863282 X-Patchwork-Delegate: kuba@kernel.org 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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 564F7C43217 for ; Fri, 27 May 2022 11:02:30 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1351150AbiE0LC2 (ORCPT ); Fri, 27 May 2022 07:02:28 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:35348 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1348937AbiE0LCR (ORCPT ); Fri, 27 May 2022 07:02:17 -0400 Received: from mga12.intel.com (mga12.intel.com [192.55.52.136]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id E9C4412AE0; Fri, 27 May 2022 04:02:14 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1653649334; x=1685185334; h=from:to:cc:subject:date:message-id:mime-version: content-transfer-encoding; bh=n4db8VHHL6r1idQnACORSXlcl38Almu2Snr1jSt3r64=; b=M3y/dV6DZc6Y2xlTji20S/Q4E0T7hT49gC/1Y2Y+I6qv61QPcbWubGM1 E0DA+PKCx/SEu/HtWTznZTKypcH9tuItRqSJ3flqV+7izh4bxyFmVOeoK NEw9o7xQ3FJA7WXhFoDVnXajNba1HWjXLxhxl7zYBAjgy/p4RKa6IfE68 DT4/gJB9LUiRqyncOP0WWlsZd9X7k2HwJEuqjdF8Etn9B7+A672rCTx4a Numd42xT2eBcwPPxk5ygd5s1Fqeb6gaQc/rfjOs6RLAd0/6psZVmQPFEj G/n7MdCKqxz+laHR8eYqhlBU1n3A2LumN/cF9ShDfHuvzCyiXVQF6lFkV g==; X-IronPort-AV: E=McAfee;i="6400,9594,10359"; a="254325958" X-IronPort-AV: E=Sophos;i="5.91,255,1647327600"; d="scan'208";a="254325958" Received: from fmsmga002.fm.intel.com ([10.253.24.26]) by fmsmga106.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 27 May 2022 04:02:14 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.91,255,1647327600"; d="scan'208";a="677939314" Received: from irvmail001.ir.intel.com ([10.43.11.63]) by fmsmga002.fm.intel.com with ESMTP; 27 May 2022 04:02:12 -0700 Received: from newjersey.igk.intel.com (newjersey.igk.intel.com [10.102.20.203]) by irvmail001.ir.intel.com (8.14.3/8.13.6/MailSET/Hub) with ESMTP id 24RB2Au6016118; Fri, 27 May 2022 12:02:10 +0100 From: Alexander Lobakin To: "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni Cc: Mark Bloch , Maor Gottlieb , netdev@vger.kernel.org, linux-rdma@vger.kernel.org, linux-kernel@vger.kernel.org, Alexander Lobakin Subject: [PATCH net] net/mlx5: fix invalid structure access Date: Fri, 27 May 2022 13:01:32 +0200 Message-Id: <20220527110132.102192-1-alexandr.lobakin@intel.com> X-Mailer: git-send-email 2.36.1 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org X-Patchwork-Delegate: kuba@kernel.org After pulling latest bpf-next, I started catching the following: [ 577.465121] general protection fault, probably for non-canonical address 0x47454cd000065c49: 0000 [#1] SMP PTI [ 577.465173] CPU: 0 PID: 339 Comm: kworker/0:2 Tainted: G I 5.18.0-rc7-bpf-next+ #91 [ 577.465211] Hardware name: Intel Corporation S2600WFT/S2600WFT, BIOS SE5C620.86B.02.01.0014.082620210524 08/26/2021 [ 577.465249] Workqueue: events work_for_cpu_fn [ 577.465276] RIP: 0010:next_phys_dev_lag+0x1f/0x100 [mlx5_core] [ 577.465458] Code: 00 00 00 00 0f 1f 80 00 00 00 00 f3 0f 1e fa 0f 1f 44 00 00 55 41 57 41 56 53 48 8b 9f f8 02 00 00 48 8b 83 38 03 00 00 31 ed 40 34 80 0f 84 b3 00 00 00 8b 40 4c 0f c8 a8 10 0f 84 a6 00 00 [ 577.465524] RSP: 0018:ffffbd020750bd58 EFLAGS: 00010246 [ 577.465548] RAX: 47454cd000065c15 RBX: ffff9c7d97bb0310 RCX: 0000000000000003 [ 577.465577] RDX: 0000000000000000 RSI: ffff9c80e7f6a1c0 RDI: ffff9c7daaea3800 [ 577.465606] RBP: 0000000000000000 R08: ffff9c80a396b400 R09: ffff9c80a396b400 [ 577.465634] R10: ffffffff910608e8 R11: ffffffffc0d41a00 R12: ffffbd020750bd80 [ 577.465662] R13: ffff9c7d802a4b40 R14: ffffffffc0d41a00 R15: ffff9c80e7f6a1c0 [ 577.465690] FS: 0000000000000000(0000) GS:ffff9c8890a00000(0000) knlGS:0000000000000000 [ 577.465722] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 577.465748] CR2: 00007fb1baf70fb8 CR3: 0000000b7a010001 CR4: 00000000007706f0 [ 577.465778] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 577.465806] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 577.465834] PKRU: 55555554 [ 577.465849] Call Trace: [ 577.465865] [ 577.465881] ? mlx5_get_next_phys_dev_lag+0x80/0x80 [mlx5_core] [ 577.466039] bus_find_device+0x88/0xc0 [ 577.466062] mlx5_get_next_phys_dev_lag+0x29/0x80 [mlx5_core] [ 577.466193] mlx5_lag_add_mdev+0x45/0x340 [mlx5_core] [ 577.466316] mlx5_load+0xf3/0x3c0 [mlx5_core] [ 577.466436] mlx5_init_one+0x1b9/0x600 [mlx5_core] [ 577.466557] probe_one+0xa0/0x1c0 [mlx5_core] [ 577.466676] local_pci_probe+0x44/0xc0 [ 577.466701] work_for_cpu_fn+0x1a/0x40 [ 577.466723] process_one_work+0x1cc/0x380 [ 577.466745] worker_thread+0x2eb/0x400 [ 577.466766] ? worker_clr_flags+0x80/0x80 [ 577.466786] kthread+0xcc/0x100 [ 577.466804] ? kthread_blkcg+0x40/0x40 [ 577.466823] ret_from_fork+0x22/0x30 [ 577.466847] [ 577.466860] Modules linked in: mlx5_core(+) psample mlxfw tls pci_hyperv_intf qrtr rfkill sunrpc vfat fat intel_rapl_msr intel_rapl_common intel_uncore_frequency intel_uncore_frequency_common isst_if_common skx_edac nfit libnvdimm x86_pkg_temp_thermal intel_powerclamp irdma coretemp kvm_intel ib_uverbs iTCO_wdt kvm intel_pmc_bxt irqbypass ib_core iTCO_vendor_support rapl intel_cstate ipmi_ssif ice i40e intel_uncore i2c_i801 mei_me joydev pcspkr ioatdma mei lpc_ich intel_pch_thermal i2c_smbus dca acpi_ipmi ipmi_si acpi_pad acpi_power_meter zram xfs crct10dif_pclmul crc32_pclmul crc32c_intel ghash_clmulni_intel ast drm_vram_helper drm_ttm_helper ttm wmi pkcs8_key_parser fuse ipmi_devintf ipmi_msghandler [ 577.468965] ---[ end trace 0000000000000000 ]--- More precisely, sometimes it was nullptr deref at address 0x00000034 and sometimes general protection fault. Bisect has lead to commit bc4c2f2e0179 ("net/mlx5: Lag, filter non compatible devices"). However, turned out that those added cap checks only revealed the already present problem: mlx5_get_next_dev() doesn't perform any checks if a device belongs to the mlx5 auxbus, starting dereferencing it as a structure embedded into &mlx5_adev right from the start. Simple debug print says the following: [ 145.960793] irdma.gen_1 i40e.iwarp.0: next auxdev [ 145.960800] irdma.gen_1 i40e.iwarp.0: no caps [ 145.960804] irdma.gen_1 i40e.iwarp.1: next auxdev [ 145.960807] irdma.gen_1 i40e.iwarp.1: no caps [ 145.960810] irdma ice.roce.0: next auxdev [ 145.960813] irdma ice.roce.0: no caps [ 145.960816] irdma ice.roce.1: next auxdev [ 145.960819] irdma ice.roce.1: no caps [ 145.960822] irdma ice.roce.2: next auxdev [ 145.960824] irdma ice.roce.2: no caps [ 146.224222] irdma.gen_1 i40e.iwarp.0: next auxdev [ 146.224228] irdma.gen_1 i40e.iwarp.0: no caps [ 146.224231] irdma.gen_1 i40e.iwarp.1: next auxdev [ 146.224233] irdma.gen_1 i40e.iwarp.1: no caps [ 146.224236] irdma ice.roce.0: next auxdev [ 146.224239] irdma ice.roce.0: no caps [ 146.224243] irdma ice.roce.1: next auxdev [ 146.224245] irdma ice.roce.1: no caps [ 146.224247] irdma ice.roce.2: next auxdev [ 146.224250] irdma ice.roce.2: no caps [ 146.224252] auxiliary mlx5_core.eth.0: next auxdev [ 146.735499] irdma.gen_1 i40e.iwarp.0: next auxdev [ 146.735506] irdma.gen_1 i40e.iwarp.0: no caps [ 146.735511] irdma.gen_1 i40e.iwarp.1: next auxdev [ 146.735514] irdma.gen_1 i40e.iwarp.1: no caps [ 146.735517] irdma ice.roce.0: next auxdev [ 146.735520] irdma ice.roce.0: no caps [ 146.735523] irdma ice.roce.1: next auxdev [ 146.735525] irdma ice.roce.1: no caps [ 146.735528] irdma ice.roce.2: next auxdev [ 146.735530] irdma ice.roce.2: no caps [ 146.735533] auxiliary mlx5_core.eth.0: next auxdev [ 146.735537] auxiliary mlx5_core.rdma.0: next auxdev [ 146.735540] auxiliary mlx5_core.eth.1: next auxdev [ 146.735543] auxiliary mlx5_core.rdma.1: next auxdev It was only a good luck previously that this wasn't triggering any other faults. It is also not common I guess to have several auxbus drivers on one machine :) Anyways, fix this by filtering the devices passed from bus_find_device(). In case with mlx5, they all have "mlx5_core" prefix defined by %MLX5_ADEV_NAME, so use it here. The results: [ 833.042660] auxiliary mlx5_core.eth.0: next auxdev [ 833.042666] auxiliary mlx5_core.rdma.0: next auxdev [ 833.042670] auxiliary mlx5_core.eth.1: next auxdev [ 833.042673] auxiliary mlx5_core.rdma.1: next auxdev [ 833.558869] auxiliary mlx5_core.eth.0: next auxdev [ 833.558876] auxiliary mlx5_core.rdma.0: next auxdev [ 833.558880] auxiliary mlx5_core.eth.1: next auxdev [ 833.558882] auxiliary mlx5_core.rdma.1: next auxdev [ 833.558886] auxiliary mlx5_core.eth.2: next auxdev Fixes: a925b5e309c9 ("net/mlx5: Register mlx5 devices to auxiliary virtual bus") Fixes: bc4c2f2e0179 ("net/mlx5: Lag, filter non compatible devices") Signed-off-by: Alexander Lobakin --- drivers/net/ethernet/mellanox/mlx5/core/dev.c | 20 +++++++++++++++---- 1 file changed, 16 insertions(+), 4 deletions(-) diff --git a/drivers/net/ethernet/mellanox/mlx5/core/dev.c b/drivers/net/ethernet/mellanox/mlx5/core/dev.c index 11f7c03ae81b..b9d13184ed7c 100644 --- a/drivers/net/ethernet/mellanox/mlx5/core/dev.c +++ b/drivers/net/ethernet/mellanox/mlx5/core/dev.c @@ -573,16 +573,28 @@ static int _next_phys_dev(struct mlx5_core_dev *mdev, static int next_phys_dev(struct device *dev, const void *data) { - struct mlx5_adev *madev = container_of(dev, struct mlx5_adev, adev.dev); - struct mlx5_core_dev *mdev = madev->mdev; + const struct mlx5_adev *madev; + struct mlx5_core_dev *mdev; + + if (!strstarts(dev_name(dev), MLX5_ADEV_NAME)) + return 0; + + madev = container_of(dev, struct mlx5_adev, adev.dev); + mdev = madev->mdev; return _next_phys_dev(mdev, data); } static int next_phys_dev_lag(struct device *dev, const void *data) { - struct mlx5_adev *madev = container_of(dev, struct mlx5_adev, adev.dev); - struct mlx5_core_dev *mdev = madev->mdev; + const struct mlx5_adev *madev; + struct mlx5_core_dev *mdev; + + if (!strstarts(dev_name(dev), MLX5_ADEV_NAME)) + return 0; + + madev = container_of(dev, struct mlx5_adev, adev.dev); + mdev = madev->mdev; if (!MLX5_CAP_GEN(mdev, vport_group_manager) || !MLX5_CAP_GEN(mdev, lag_master) ||