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=-9.8 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,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 5FACDCA9EA0 for ; Fri, 25 Oct 2019 18:09:53 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (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 1FDA321D7F for ; Fri, 25 Oct 2019 18:09:53 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="DFTC8hEt" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 1FDA321D7F Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=arm.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20170209; h=Sender: Content-Transfer-Encoding:Content-Type:Cc:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To: Message-Id:Date:Subject:To:From:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=58LoAG4bq/yyKyVXhHGDDO77Y8as78bDeCe/AsQT7mI=; b=DFTC8hEteRVqjc RhFtgUQUDKUflCsVsgdQuT/4NQWhn6gDI3fbLWf1EiIVR8XUshasQXuA0tcSAFLNCGkF/OTbZb10o zFeSNvmwPD3Hmzm8+oWzn4TkilwgkEun9YEgeaT815fCv8hZJUyPQ95MGqbjmMQFB4oey0MOn8LSb /1p6W/TVb4QVDkJJD8IaRRNNtj/N8zb/HtpE53NHEmCxEk5gmbH618IP1hjGgb3TesAhI3hOuv8bo 7J/cPWnotvhKXifjiTQW9WX5oDz0yRpo0A6zkzJlhIADo8jz0gfP7Z6+B33GFO7SknG/4yEIQ10tn UT2eUw7U2t+7viVBAndw==; Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.92.3 #3 (Red Hat Linux)) id 1iO41y-0004lP-96; Fri, 25 Oct 2019 18:09:46 +0000 Received: from foss.arm.com ([217.140.110.172]) by bombadil.infradead.org with esmtp (Exim 4.92.3 #3 (Red Hat Linux)) id 1iO411-0003tb-Gi for linux-arm-kernel@lists.infradead.org; Fri, 25 Oct 2019 18:08:49 +0000 Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 14DE0492; Fri, 25 Oct 2019 11:08:45 -0700 (PDT) Received: from e110467-lin.cambridge.arm.com (e110467-lin.cambridge.arm.com [10.1.197.57]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPA id 635EE3F6C4; Fri, 25 Oct 2019 11:08:44 -0700 (PDT) From: Robin Murphy To: will@kernel.org Subject: [PATCH v2 02/10] iommu/io-pgtable-arm: Rationalise size check Date: Fri, 25 Oct 2019 19:08:31 +0100 Message-Id: X-Mailer: git-send-email 2.21.0.dirty In-Reply-To: References: MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20191025_110847_593532_3D7958AD X-CRM114-Status: GOOD ( 15.32 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: iommu@lists.linux-foundation.org, jcrouse@codeaurora.org, linux-arm-kernel@lists.infradead.org Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org It makes little sense to only validate the requested size after we think we've found a matching block size - making the check up-front is simple, and far more logical than waiting to walk off the bottom of the table to infer that we must have been passed a bogus size to start with. We're missing an equivalent check on the unmap path, so add that as well for consistency. Signed-off-by: Robin Murphy --- drivers/iommu/io-pgtable-arm.c | 10 +++++++++- 1 file changed, 9 insertions(+), 1 deletion(-) diff --git a/drivers/iommu/io-pgtable-arm.c b/drivers/iommu/io-pgtable-arm.c index afa61b32b052..2cef0f5335e4 100644 --- a/drivers/iommu/io-pgtable-arm.c +++ b/drivers/iommu/io-pgtable-arm.c @@ -392,7 +392,7 @@ static int __arm_lpae_map(struct arm_lpae_io_pgtable *data, unsigned long iova, ptep += ARM_LPAE_LVL_IDX(iova, lvl, data); /* If we can install a leaf entry at this level, then do so */ - if (size == block_size && (size & cfg->pgsize_bitmap)) + if (size == block_size) return arm_lpae_init_pte(data, iova, paddr, prot, lvl, ptep); /* We can't allocate tables at the final level */ @@ -479,6 +479,7 @@ static int arm_lpae_map(struct io_pgtable_ops *ops, unsigned long iova, phys_addr_t paddr, size_t size, int iommu_prot) { struct arm_lpae_io_pgtable *data = io_pgtable_ops_to_data(ops); + struct io_pgtable_cfg *cfg = &data->iop.cfg; arm_lpae_iopte *ptep = data->pgd; int ret, lvl = ARM_LPAE_START_LVL(data); arm_lpae_iopte prot; @@ -487,6 +488,9 @@ static int arm_lpae_map(struct io_pgtable_ops *ops, unsigned long iova, if (!(iommu_prot & (IOMMU_READ | IOMMU_WRITE))) return 0; + if (WARN_ON(!size || (size & cfg->pgsize_bitmap) != size)) + return -EINVAL; + if (WARN_ON(iova >= (1ULL << data->iop.cfg.ias) || paddr >= (1ULL << data->iop.cfg.oas))) return -ERANGE; @@ -652,9 +656,13 @@ static size_t arm_lpae_unmap(struct io_pgtable_ops *ops, unsigned long iova, size_t size, struct iommu_iotlb_gather *gather) { struct arm_lpae_io_pgtable *data = io_pgtable_ops_to_data(ops); + struct io_pgtable_cfg *cfg = &data->iop.cfg; arm_lpae_iopte *ptep = data->pgd; int lvl = ARM_LPAE_START_LVL(data); + if (WARN_ON(!size || (size & cfg->pgsize_bitmap) != size)) + return 0; + if (WARN_ON(iova >= (1ULL << data->iop.cfg.ias))) return 0; -- 2.21.0.dirty _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel