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 X-Spam-Level: X-Spam-Status: No, score=-6.0 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 946CCC4360F for ; Fri, 22 Mar 2019 12:37:11 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 5B33521900 for ; Fri, 22 Mar 2019 12:37:11 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1553258231; bh=FJsvs7aavC4wzRkW1vkriA+hFnoHsDqg+tjBcNewryc=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=psg5kRPECLa81h3uvldWRcZi8sXh6/67X3AltcOcO8m4/Q03OePOBQPCVK2F+VmWc 2A1TylESqvtTXi+2c0iUpOAQZBAkq0aVfBC8qCE3/meCx9yVrxvfztKOYaF0rY0Jcb bNXoxI/ly+VokG0KANN88Bm6gDh/sF8JU+Xsouq8= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728772AbfCVMhE (ORCPT ); Fri, 22 Mar 2019 08:37:04 -0400 Received: from mail.kernel.org ([198.145.29.99]:48834 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2389420AbfCVMKY (ORCPT ); Fri, 22 Mar 2019 08:10:24 -0400 Received: from localhost (83-86-89-107.cable.dynamic.v4.ziggo.nl [83.86.89.107]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 154CB20830; Fri, 22 Mar 2019 12:10:22 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1553256623; bh=FJsvs7aavC4wzRkW1vkriA+hFnoHsDqg+tjBcNewryc=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=oPoxbczhWKaGZyfJDM+se9rPPhUK+r+msV9F9yIitTTALiT9Xg9FunDdnk/qL7OIp sJQxEO/xkJArNfihswsGIgpbunpttjqbM2DjR/POpkEvKFeTJBya+SZxLRvEkRUFTA Z6aQH118q/rfCVpzV5nb6xVbEbwQoiGUjVvnStW0= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, NuoHan Qiao , Corey Minyard , Yang Yingliang Subject: [PATCH 4.19 235/280] ipmi_si: fix use-after-free of resource->name Date: Fri, 22 Mar 2019 12:16:28 +0100 Message-Id: <20190322111338.071352335@linuxfoundation.org> X-Mailer: git-send-email 2.21.0 In-Reply-To: <20190322111306.356185024@linuxfoundation.org> References: <20190322111306.356185024@linuxfoundation.org> User-Agent: quilt/0.65 X-stable: review X-Patchwork-Hint: ignore MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: stable-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org 4.19-stable review patch. If anyone has any objections, please let me know. ------------------ From: Yang Yingliang commit 401e7e88d4ef80188ffa07095ac00456f901b8c4 upstream. When we excute the following commands, we got oops rmmod ipmi_si cat /proc/ioports [ 1623.482380] Unable to handle kernel paging request at virtual address ffff00000901d478 [ 1623.482382] Mem abort info: [ 1623.482383] ESR = 0x96000007 [ 1623.482385] Exception class = DABT (current EL), IL = 32 bits [ 1623.482386] SET = 0, FnV = 0 [ 1623.482387] EA = 0, S1PTW = 0 [ 1623.482388] Data abort info: [ 1623.482389] ISV = 0, ISS = 0x00000007 [ 1623.482390] CM = 0, WnR = 0 [ 1623.482393] swapper pgtable: 4k pages, 48-bit VAs, pgdp = 00000000d7d94a66 [ 1623.482395] [ffff00000901d478] pgd=000000dffbfff003, pud=000000dffbffe003, pmd=0000003f5d06e003, pte=0000000000000000 [ 1623.482399] Internal error: Oops: 96000007 [#1] SMP [ 1623.487407] Modules linked in: ipmi_si(E) nls_utf8 isofs rpcrdma ib_iser ib_srpt target_core_mod ib_srp scsi_transport_srp ib_ipoib rdma_ucm ib_umad rdma_cm ib_cm dm_mirror dm_region_hash dm_log iw_cm dm_mod aes_ce_blk crypto_simd cryptd aes_ce_cipher ses ghash_ce sha2_ce enclosure sha256_arm64 sg sha1_ce hisi_sas_v2_hw hibmc_drm sbsa_gwdt hisi_sas_main ip_tables mlx5_ib ib_uverbs marvell ib_core mlx5_core ixgbe mdio hns_dsaf ipmi_devintf hns_enet_drv ipmi_msghandler hns_mdio [last unloaded: ipmi_si] [ 1623.532410] CPU: 30 PID: 11438 Comm: cat Kdump: loaded Tainted: G E 5.0.0-rc3+ #168 [ 1623.541498] Hardware name: Huawei TaiShan 2280 /BC11SPCD, BIOS 1.37 11/21/2017 [ 1623.548822] pstate: a0000005 (NzCv daif -PAN -UAO) [ 1623.553684] pc : string+0x28/0x98 [ 1623.557040] lr : vsnprintf+0x368/0x5e8 [ 1623.560837] sp : ffff000013213a80 [ 1623.564191] x29: ffff000013213a80 x28: ffff00001138abb5 [ 1623.569577] x27: ffff000013213c18 x26: ffff805f67d06049 [ 1623.574963] x25: 0000000000000000 x24: ffff00001138abb5 [ 1623.580349] x23: 0000000000000fb7 x22: ffff0000117ed000 [ 1623.585734] x21: ffff000011188fd8 x20: ffff805f67d07000 [ 1623.591119] x19: ffff805f67d06061 x18: ffffffffffffffff [ 1623.596505] x17: 0000000000000200 x16: 0000000000000000 [ 1623.601890] x15: ffff0000117ed748 x14: ffff805f67d07000 [ 1623.607276] x13: ffff805f67d0605e x12: 0000000000000000 [ 1623.612661] x11: 0000000000000000 x10: 0000000000000000 [ 1623.618046] x9 : 0000000000000000 x8 : 000000000000000f [ 1623.623432] x7 : ffff805f67d06061 x6 : fffffffffffffffe [ 1623.628817] x5 : 0000000000000012 x4 : ffff00000901d478 [ 1623.634203] x3 : ffff0a00ffffff04 x2 : ffff805f67d07000 [ 1623.639588] x1 : ffff805f67d07000 x0 : ffffffffffffffff [ 1623.644974] Process cat (pid: 11438, stack limit = 0x000000008d4cbc10) [ 1623.651592] Call trace: [ 1623.654068] string+0x28/0x98 [ 1623.657071] vsnprintf+0x368/0x5e8 [ 1623.660517] seq_vprintf+0x70/0x98 [ 1623.668009] seq_printf+0x7c/0xa0 [ 1623.675530] r_show+0xc8/0xf8 [ 1623.682558] seq_read+0x330/0x440 [ 1623.689877] proc_reg_read+0x78/0xd0 [ 1623.697346] __vfs_read+0x60/0x1a0 [ 1623.704564] vfs_read+0x94/0x150 [ 1623.711339] ksys_read+0x6c/0xd8 [ 1623.717939] __arm64_sys_read+0x24/0x30 [ 1623.725077] el0_svc_common+0x120/0x148 [ 1623.732035] el0_svc_handler+0x30/0x40 [ 1623.738757] el0_svc+0x8/0xc [ 1623.744520] Code: d1000406 aa0103e2 54000149 b4000080 (39400085) [ 1623.753441] ---[ end trace f91b6a4937de9835 ]--- [ 1623.760871] Kernel panic - not syncing: Fatal exception [ 1623.768935] SMP: stopping secondary CPUs [ 1623.775718] Kernel Offset: disabled [ 1623.781998] CPU features: 0x002,21006008 [ 1623.788777] Memory Limit: none [ 1623.798329] Starting crashdump kernel... [ 1623.805202] Bye! If io_setup is called successful in try_smi_init() but try_smi_init() goes out_err before calling ipmi_register_smi(), so ipmi_unregister_smi() will not be called while removing module. It leads to the resource that allocated in io_setup() can not be freed, but the name(DEVICE_NAME) of resource is freed while removing the module. It causes use-after-free when cat /proc/ioports. Fix this by calling io_cleanup() while try_smi_init() goes to out_err. and don't call io_cleanup() until io_setup() returns successful to avoid warning prints. Fixes: 93c303d2045b ("ipmi_si: Clean up shutdown a bit") Cc: stable@vger.kernel.org Reported-by: NuoHan Qiao Suggested-by: Corey Minyard Signed-off-by: Yang Yingliang Signed-off-by: Corey Minyard Signed-off-by: Greg Kroah-Hartman --- drivers/char/ipmi/ipmi_si_intf.c | 5 +++++ drivers/char/ipmi/ipmi_si_mem_io.c | 5 +++-- drivers/char/ipmi/ipmi_si_port_io.c | 5 +++-- 3 files changed, 11 insertions(+), 4 deletions(-) --- a/drivers/char/ipmi/ipmi_si_intf.c +++ b/drivers/char/ipmi/ipmi_si_intf.c @@ -2085,6 +2085,11 @@ static int try_smi_init(struct smi_info WARN_ON(new_smi->io.dev->init_name != NULL); out_err: + if (rv && new_smi->io.io_cleanup) { + new_smi->io.io_cleanup(&new_smi->io); + new_smi->io.io_cleanup = NULL; + } + kfree(init_name); return rv; } --- a/drivers/char/ipmi/ipmi_si_mem_io.c +++ b/drivers/char/ipmi/ipmi_si_mem_io.c @@ -81,8 +81,6 @@ int ipmi_si_mem_setup(struct si_sm_io *i if (!addr) return -ENODEV; - io->io_cleanup = mem_cleanup; - /* * Figure out the actual readb/readw/readl/etc routine to use based * upon the register size. @@ -141,5 +139,8 @@ int ipmi_si_mem_setup(struct si_sm_io *i mem_region_cleanup(io, io->io_size); return -EIO; } + + io->io_cleanup = mem_cleanup; + return 0; } --- a/drivers/char/ipmi/ipmi_si_port_io.c +++ b/drivers/char/ipmi/ipmi_si_port_io.c @@ -68,8 +68,6 @@ int ipmi_si_port_setup(struct si_sm_io * if (!addr) return -ENODEV; - io->io_cleanup = port_cleanup; - /* * Figure out the actual inb/inw/inl/etc routine to use based * upon the register size. @@ -109,5 +107,8 @@ int ipmi_si_port_setup(struct si_sm_io * return -EIO; } } + + io->io_cleanup = port_cleanup; + return 0; }