From patchwork Fri Jan 8 14:36:32 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jinpu Wang X-Patchwork-Id: 12006727 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=-18.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER, INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED, USER_AGENT_GIT autolearn=ham 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 7FBA3C433E6 for ; Fri, 8 Jan 2021 14:37:24 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 3FCE523884 for ; Fri, 8 Jan 2021 14:37:24 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727176AbhAHOhX (ORCPT ); Fri, 8 Jan 2021 09:37:23 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:55992 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726935AbhAHOhU (ORCPT ); Fri, 8 Jan 2021 09:37:20 -0500 Received: from mail-ej1-x632.google.com (mail-ej1-x632.google.com [IPv6:2a00:1450:4864:20::632]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id B69A8C0612FD for ; Fri, 8 Jan 2021 06:36:39 -0800 (PST) Received: by mail-ej1-x632.google.com with SMTP id ga15so14825292ejb.4 for ; Fri, 08 Jan 2021 06:36:39 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=cloud.ionos.com; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=xDFpQWrHMsuKz/nh26/noW6aHuNV8mbI1uQD9qPo1DM=; b=FDhELJkw7kpTs1Too27M1GbjuEU6VA8MqoDNV6jlYAL0RrNIYmqMlkHCdWJVzldtDO 3fTDAbyLUrs91J900Nk35cI2RZVbk/XcdrJ3lxPfQzWWk3sf4i65wfdvd+yDZgcI7QRn Laj1r4OH2T0Mo32K8RnzQrLN2u54L7MzNmCblvh7RT9hL6gcRSbe2S4qJQTmWWtNedKb 6m17NTcrnRNSn2j6QJPUFt3BUmmemDNrkOTj/KGYcJJd1McQu5NeSEvuOBKo+6ggmKtR C1Nkh6r9jMIqykWuyQfX+jI2jnpij6RcNJ0rIh/CJ0nEVYNmdSZrxOAWY9BUSqJVoRUB 2NBQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=xDFpQWrHMsuKz/nh26/noW6aHuNV8mbI1uQD9qPo1DM=; b=TH/ryDQSGh1VH8AsiOKx4Ld3a5m7bnnJDtTd2M4C5+WL5KSv435xYfQx5YHtuz0VRn 92FY6+WUekIpJQ6fuD92EmHO9KxcyxxOO13t3k18GNQ4Csp3OossUbm1n6H78Y32BDAh Zkt466tIg3rpn+lEYn7bDT9ut8bZeaBbrPTn3dM7iMK/0Jp3SM/KEzE3Rd4aqz7xvZPj y87fwAnvcHRG+SMM1UhBhU6CyQU7Kg45o6XsHFRYkumr5LWrEkoc26YP3siIdao49c2c MnbaQ55YTvNp/DajOgnKU9a5XNiIS93zdtzuPLTd07eI//psylDqlr6IFERscZxPxcHe oQ5g== X-Gm-Message-State: AOAM532BKD7wogClu6Wi1DvUHL6EXGSPbmj26LJvjW/pSZJXk48KruBr doBclXR/qJiqMTpmC41C/0poUJl/8IEHPQ== X-Google-Smtp-Source: ABdhPJxciLNzvQWim5KMMvqRtG2gwMHveOv/3jfMUXZyAYTJnF3QD6mFEhV5y48fOClONWl3o69ZZQ== X-Received: by 2002:a17:906:3a0d:: with SMTP id z13mr2806615eje.2.1610116598220; Fri, 08 Jan 2021 06:36:38 -0800 (PST) Received: from jwang-Latitude-5491.fkb.profitbricks.net ([2001:16b8:4906:c200:31ac:50df:cd1f:f7fc]) by smtp.gmail.com with ESMTPSA id e25sm3858698edq.24.2021.01.08.06.36.37 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 08 Jan 2021 06:36:37 -0800 (PST) From: Jack Wang To: linux-block@vger.kernel.org Cc: axboe@kernel.dk, hch@infradead.org, sagi@grimberg.me, bvanassche@acm.org, danil.kipnis@cloud.ionos.com, Guoqing Jiang Subject: [PATCH for-rc 3/5] block/rnbd-clt: Fix sg table use after free Date: Fri, 8 Jan 2021 15:36:32 +0100 Message-Id: <20210108143634.175394-4-jinpu.wang@cloud.ionos.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20210108143634.175394-1-jinpu.wang@cloud.ionos.com> References: <20210108143634.175394-1-jinpu.wang@cloud.ionos.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-block@vger.kernel.org From: Guoqing Jiang Since dynamically allocate sglist is used for rnbd_iu, we can't free sg table after send_usr_msg since the callback function (cqe.done) could still access the sglist. Otherwise KASAN reports UAF issue: [ 4856.600257] BUG: KASAN: use-after-free in dma_direct_unmap_sg+0x53/0x290 [ 4856.600772] Read of size 4 at addr ffff888206af3a98 by task swapper/1/0 [ 4856.601729] CPU: 1 PID: 0 Comm: swapper/1 Kdump: loaded Tainted: G W 5.10.0-pserver #5.10.0-1+feature+linux+next+20201214.1025+0910d71 [ 4856.601748] Hardware name: Supermicro Super Server/X11DDW-L, BIOS 3.3 02/21/2020 [ 4856.601766] Call Trace: [ 4856.601785] [ 4856.601822] dump_stack+0x99/0xcb [ 4856.601856] ? dma_direct_unmap_sg+0x53/0x290 [ 4856.601888] print_address_description.constprop.7+0x1e/0x230 [ 4856.601913] ? freeze_kernel_threads+0x73/0x73 [ 4856.601965] ? mark_held_locks+0x29/0xa0 [ 4856.602019] ? dma_direct_unmap_sg+0x53/0x290 [ 4856.602039] ? dma_direct_unmap_sg+0x53/0x290 [ 4856.602079] kasan_report.cold.9+0x37/0x7c [ 4856.602188] ? mlx5_ib_post_recv+0x430/0x520 [mlx5_ib] [ 4856.602209] ? dma_direct_unmap_sg+0x53/0x290 [ 4856.602256] dma_direct_unmap_sg+0x53/0x290 [ 4856.602366] complete_rdma_req+0x188/0x4b0 [rtrs_client] [ 4856.602451] ? rtrs_clt_close+0x80/0x80 [rtrs_client] [ 4856.602535] ? mlx5_ib_poll_cq+0x48b/0x16e0 [mlx5_ib] [ 4856.602589] ? radix_tree_insert+0x3a0/0x3a0 [ 4856.602610] ? do_raw_spin_lock+0x119/0x1d0 [ 4856.602647] ? rwlock_bug.part.1+0x60/0x60 [ 4856.602740] rtrs_clt_rdma_done+0x3f7/0x670 [rtrs_client] [ 4856.602804] ? rtrs_clt_rdma_cm_handler+0xda0/0xda0 [rtrs_client] [ 4856.602857] ? check_flags.part.31+0x6c/0x1f0 [ 4856.602927] ? rcu_read_lock_sched_held+0xaf/0xe0 [ 4856.602963] ? rcu_read_lock_bh_held+0xc0/0xc0 [ 4856.603137] __ib_process_cq+0x10a/0x350 [ib_core] [ 4856.603309] ib_poll_handler+0x41/0x1c0 [ib_core] [ 4856.603358] irq_poll_softirq+0xe6/0x280 [ 4856.603392] ? lockdep_hardirqs_on_prepare+0x111/0x210 [ 4856.603446] __do_softirq+0x10d/0x646 [ 4856.603540] asm_call_irq_on_stack+0x12/0x20 [ 4856.603563] [ 4856.605096] Allocated by task 8914: [ 4856.605510] kasan_save_stack+0x19/0x40 [ 4856.605532] __kasan_kmalloc.constprop.7+0xc1/0xd0 [ 4856.605552] __kmalloc+0x155/0x320 [ 4856.605574] __sg_alloc_table+0x155/0x1c0 [ 4856.605594] sg_alloc_table+0x1f/0x50 [ 4856.605620] send_msg_sess_info+0x119/0x2e0 [rnbd_client] [ 4856.605646] remap_devs+0x71/0x210 [rnbd_client] [ 4856.605676] init_sess+0xad8/0xe10 [rtrs_client] [ 4856.605706] rtrs_clt_reconnect_work+0xd6/0x170 [rtrs_client] [ 4856.605728] process_one_work+0x521/0xa90 [ 4856.605748] worker_thread+0x65/0x5b0 [ 4856.605769] kthread+0x1f2/0x210 [ 4856.605789] ret_from_fork+0x22/0x30 [ 4856.606159] Freed by task 8914: [ 4856.606559] kasan_save_stack+0x19/0x40 [ 4856.606580] kasan_set_track+0x1c/0x30 [ 4856.606601] kasan_set_free_info+0x1b/0x30 [ 4856.606622] __kasan_slab_free+0x108/0x150 [ 4856.606642] slab_free_freelist_hook+0x64/0x190 [ 4856.606661] kfree+0xe2/0x650 [ 4856.606681] __sg_free_table+0xa4/0x100 [ 4856.606707] send_msg_sess_info+0x1d6/0x2e0 [rnbd_client] [ 4856.606733] remap_devs+0x71/0x210 [rnbd_client] [ 4856.606763] init_sess+0xad8/0xe10 [rtrs_client] [ 4856.606792] rtrs_clt_reconnect_work+0xd6/0x170 [rtrs_client] [ 4856.606813] process_one_work+0x521/0xa90 [ 4856.606833] worker_thread+0x65/0x5b0 [ 4856.606853] kthread+0x1f2/0x210 [ 4856.606872] ret_from_fork+0x22/0x30 The solution is to free iu's sgtable after the iu is not used anymore. And also move sg_alloc_table into rnbd_get_iu accordingly. Fixes: 5a1328d0c3a7 ("block/rnbd-clt: Dynamically allocate sglist for rnbd_iu") Signed-off-by: Guoqing Jiang Signed-off-by: Jack Wang --- drivers/block/rnbd/rnbd-clt.c | 15 +++++++-------- 1 file changed, 7 insertions(+), 8 deletions(-) diff --git a/drivers/block/rnbd/rnbd-clt.c b/drivers/block/rnbd/rnbd-clt.c index 9165e70bee0c..c696c3a937d7 100644 --- a/drivers/block/rnbd/rnbd-clt.c +++ b/drivers/block/rnbd/rnbd-clt.c @@ -375,12 +375,19 @@ static struct rnbd_iu *rnbd_get_iu(struct rnbd_clt_session *sess, init_waitqueue_head(&iu->comp.wait); iu->comp.errno = INT_MAX; + if (sg_alloc_table(&iu->sgt, 1, GFP_KERNEL)) { + rnbd_put_permit(sess, permit); + kfree(iu); + return NULL; + } + return iu; } static void rnbd_put_iu(struct rnbd_clt_session *sess, struct rnbd_iu *iu) { if (atomic_dec_and_test(&iu->refcount)) { + sg_free_table(&iu->sgt); rnbd_put_permit(sess, iu->permit); kfree(iu); } @@ -487,8 +494,6 @@ static int send_msg_close(struct rnbd_clt_dev *dev, u32 device_id, bool wait) iu->buf = NULL; iu->dev = dev; - sg_alloc_table(&iu->sgt, 1, GFP_KERNEL); - msg.hdr.type = cpu_to_le16(RNBD_MSG_CLOSE); msg.device_id = cpu_to_le32(device_id); @@ -502,7 +507,6 @@ static int send_msg_close(struct rnbd_clt_dev *dev, u32 device_id, bool wait) err = errno; } - sg_free_table(&iu->sgt); rnbd_put_iu(sess, iu); return err; } @@ -575,7 +579,6 @@ static int send_msg_open(struct rnbd_clt_dev *dev, bool wait) iu->buf = rsp; iu->dev = dev; - sg_alloc_table(&iu->sgt, 1, GFP_KERNEL); sg_init_one(iu->sgt.sgl, rsp, sizeof(*rsp)); msg.hdr.type = cpu_to_le16(RNBD_MSG_OPEN); @@ -594,7 +597,6 @@ static int send_msg_open(struct rnbd_clt_dev *dev, bool wait) err = errno; } - sg_free_table(&iu->sgt); rnbd_put_iu(sess, iu); return err; } @@ -622,8 +624,6 @@ static int send_msg_sess_info(struct rnbd_clt_session *sess, bool wait) iu->buf = rsp; iu->sess = sess; - - sg_alloc_table(&iu->sgt, 1, GFP_KERNEL); sg_init_one(iu->sgt.sgl, rsp, sizeof(*rsp)); msg.hdr.type = cpu_to_le16(RNBD_MSG_SESS_INFO); @@ -650,7 +650,6 @@ static int send_msg_sess_info(struct rnbd_clt_session *sess, bool wait) } else { err = errno; } - sg_free_table(&iu->sgt); rnbd_put_iu(sess, iu); return err; }