From patchwork Mon Jul 20 11:37:41 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Klaus Jensen X-Patchwork-Id: 277709 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=-12.8 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED, HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH, MAILING_LIST_MULTI, SIGNED_OFF_BY, SPF_HELO_NONE, SPF_PASS, 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 A9A72C433E6 for ; Mon, 20 Jul 2020 11:44:35 +0000 (UTC) Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 7B5EE2176B for ; Mon, 20 Jul 2020 11:44:35 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (2048-bit key) header.d=irrelevant.dk header.i=@irrelevant.dk header.b="wC7e/eEf" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 7B5EE2176B Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=irrelevant.dk Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Received: from localhost ([::1]:38628 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1jxUDi-0000LD-MB for qemu-devel@archiver.kernel.org; Mon, 20 Jul 2020 07:44:34 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:37402) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1jxU7k-00081h-VQ; Mon, 20 Jul 2020 07:38:24 -0400 Received: from charlie.dont.surf ([128.199.63.193]:46898) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1jxU7j-0005BC-5T; Mon, 20 Jul 2020 07:38:24 -0400 Received: from apples.local (80-167-98-190-cable.dk.customer.tdc.net [80.167.98.190]) by charlie.dont.surf (Postfix) with ESMTPSA id 1F09CBF5F1; Mon, 20 Jul 2020 11:38:00 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=irrelevant.dk; s=default; t=1595245080; bh=X/wsVqfw1/FsdcK8SaPGwwSq1tr6rlWBwc4HMvRFUpY=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=wC7e/eEfv5NsnWKeaqFgCptVe1SS8lOsWWtM+Jd2+EB+P+kkD7iEW5VGU1j8AJ1Gk WIuFlqyTXRmC6TmF2PkXxxbf/DCWqw5DrdX2OQwD+6j08eHEFssiUjbRlGFspMjSvx ZTcajR6auyADJtsPAkwvpVaqjIi8H/6En5gJG+TpR9bIoVqjvuX5PE0btSPpFnHUZo GSfCsi59kCfgHmMYgmH2+KqYpLNNbgM4cMDtOPE0KGA2KLaWB2K0dBXcFgnl/WgWaO dbJmCLX9ja/R++ej3KFV9+3Zw+BMeWmQkBG1k4Hrh5PMObn7beBXJKnkyPbFZle7aV hOPZblzkI7knw== From: Klaus Jensen To: qemu-devel@nongnu.org Subject: [PATCH 09/16] hw/block/nvme: refactor request bounds checking Date: Mon, 20 Jul 2020 13:37:41 +0200 Message-Id: <20200720113748.322965-10-its@irrelevant.dk> X-Mailer: git-send-email 2.27.0 In-Reply-To: <20200720113748.322965-1-its@irrelevant.dk> References: <20200720113748.322965-1-its@irrelevant.dk> MIME-Version: 1.0 Received-SPF: pass client-ip=128.199.63.193; envelope-from=its@irrelevant.dk; helo=charlie.dont.surf X-detected-operating-system: by eggs.gnu.org: First seen = 2020/07/20 07:37:55 X-ACL-Warn: Detected OS = Linux 2.2.x-3.x [generic] [fuzzy] X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Kevin Wolf , qemu-block@nongnu.org, Klaus Jensen , Max Reitz , Keith Busch , Klaus Jensen , Maxim Levitsky Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" From: Klaus Jensen Hoist bounds checking into its own function and check for wrap-around. Signed-off-by: Klaus Jensen Reviewed-by: Maxim Levitsky --- hw/block/nvme.c | 26 +++++++++++++++++++++----- 1 file changed, 21 insertions(+), 5 deletions(-) diff --git a/hw/block/nvme.c b/hw/block/nvme.c index 530f5155eac0..35bc1a7b7e21 100644 --- a/hw/block/nvme.c +++ b/hw/block/nvme.c @@ -553,6 +553,18 @@ static void nvme_clear_events(NvmeCtrl *n, uint8_t event_type) } } +static inline uint16_t nvme_check_bounds(NvmeCtrl *n, NvmeNamespace *ns, + uint64_t slba, uint32_t nlb) +{ + uint64_t nsze = le64_to_cpu(ns->id_ns.nsze); + + if (unlikely(UINT64_MAX - slba < nlb || slba + nlb > nsze)) { + return NVME_LBA_RANGE | NVME_DNR; + } + + return NVME_SUCCESS; +} + static void nvme_rw_cb(void *opaque, int ret) { NvmeRequest *req = opaque; @@ -600,12 +612,14 @@ static uint16_t nvme_write_zeros(NvmeCtrl *n, NvmeNamespace *ns, NvmeCmd *cmd, uint32_t nlb = le16_to_cpu(rw->nlb) + 1; uint64_t offset = slba << data_shift; uint32_t count = nlb << data_shift; + uint16_t status; trace_pci_nvme_write_zeroes(nvme_cid(req), slba, nlb); - if (unlikely(slba + nlb > ns->id_ns.nsze)) { + status = nvme_check_bounds(n, ns, slba, nlb); + if (status) { trace_pci_nvme_err_invalid_lba_range(slba, nlb, ns->id_ns.nsze); - return NVME_LBA_RANGE | NVME_DNR; + return status; } block_acct_start(blk_get_stats(n->conf.blk), &req->acct, 0, @@ -628,13 +642,15 @@ static uint16_t nvme_rw(NvmeCtrl *n, NvmeNamespace *ns, NvmeCmd *cmd, uint64_t data_offset = slba << data_shift; int is_write = rw->opcode == NVME_CMD_WRITE ? 1 : 0; enum BlockAcctType acct = is_write ? BLOCK_ACCT_WRITE : BLOCK_ACCT_READ; + uint16_t status; trace_pci_nvme_rw(is_write ? "write" : "read", nlb, data_size, slba); - if (unlikely((slba + nlb) > ns->id_ns.nsze)) { - block_acct_invalid(blk_get_stats(n->conf.blk), acct); + status = nvme_check_bounds(n, ns, slba, nlb); + if (status) { trace_pci_nvme_err_invalid_lba_range(slba, nlb, ns->id_ns.nsze); - return NVME_LBA_RANGE | NVME_DNR; + block_acct_invalid(blk_get_stats(n->conf.blk), acct); + return status; } if (nvme_map(n, cmd, data_size, req)) {