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a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:in-reply-to:message-id:mime-version :references:subject:from:to:cc; bh=i5cRHHCicMsppSSBbFWeJPgqhQ8FMrYjuCKfr4hxLgs=; b=PH6m7m40I2j+31r3CU/OmZAxA9K8GSb88m2qmSQGuQh2PABjL0OPUp87//81s58hte PpemkKKNS6XeGALTV9LnHznae649hKhSHPjJKmCHNdpTU7roNB4M43ZCQQs5cqXx5WA9 24KleckWAvggpkryudstljmf2Yeokx6ZSU3MOccAWGt3kY/VvFV8XJD0X5cnP3z2fUNc GqhW30XXueWBXyaOP1RdEByIIwmK66LbGTKtcXO9QLLfJChxSSQHOlUueKefzR9uoNqM rvy4bPKdhraOzqK1NAIkRIypDAtBrx7a2cCe+tXMxBlwxkMWz5deosIGEDcDqXoUUCPA YIGQ== X-Gm-Message-State: APjAAAVKtTLzKD02iUXTTAjAaBhH+xYcPCAvCtHuQ9/2EZN0Z2OjkCb+ BhU+dHslshw7LIzVhXXODsJD69elbGXUedBYL466jW5wyRb2OaqV5Qv/KsFwtyYnqb5640FcIRT N6Hqzc62BTD3PM6AANIr4xe5RijQPMvBm29q8Dg/tUukANnOFqCiLbrhoq5FFKpa48m9PCxDNfc HQRRuoPidOOMR6TJ0= X-Google-Smtp-Source: APXvYqxlndJ8+4ezg3WqxZgwPuj7croHV+8pOSI6UJilulRqZobP0HRc/RuNHVT76apRYIt7gunvINxeeY21hcHq X-Received: by 2002:ac8:2817:: with SMTP id 23mr23534732qtq.174.1559580972876; Mon, 03 Jun 2019 09:56:12 -0700 (PDT) Date: Mon, 3 Jun 2019 18:55:17 +0200 In-Reply-To: Message-Id: Mime-Version: 1.0 References: X-Mailer: git-send-email 2.22.0.rc1.311.g5d7573a151-goog Subject: [PATCH v16 15/16] vfio/type1, arm64: untag user pointers in vaddr_get_pfn From: Andrey Konovalov To: linux-arm-kernel@lists.infradead.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org, amd-gfx@lists.freedesktop.org, dri-devel@lists.freedesktop.org, linux-rdma@vger.kernel.org, linux-media@vger.kernel.org, kvm@vger.kernel.org, linux-kselftest@vger.kernel.org X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20190603_095614_999950_EFD599FD X-CRM114-Status: GOOD ( 11.53 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Mark Rutland , Szabolcs Nagy , Catalin Marinas , Will Deacon , Kostya Serebryany , Khalid Aziz , Felix Kuehling , Vincenzo Frascino , Jacob Bramley , Leon Romanovsky , Christoph Hellwig , Jason Gunthorpe , Dave Martin , Evgeniy Stepanov , Kevin Brodsky , Kees Cook , Ruben Ayrapetyan , Andrey Konovalov , Ramana Radhakrishnan , Alex Williamson , Mauro Carvalho Chehab , Dmitry Vyukov , Greg Kroah-Hartman , Yishai Hadas , Jens Wiklander , Lee Smith , Alexander Deucher , Andrew Morton , enh , Robin Murphy , Christian Koenig , Luc Van Oostenryck 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 This patch is a part of a series that extends arm64 kernel ABI to allow to pass tagged user pointers (with the top byte set to something else other than 0x00) as syscall arguments. vaddr_get_pfn() uses provided user pointers for vma lookups, which can only by done with untagged pointers. Untag user pointers in this function. Signed-off-by: Andrey Konovalov --- drivers/vfio/vfio_iommu_type1.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/drivers/vfio/vfio_iommu_type1.c b/drivers/vfio/vfio_iommu_type1.c index 3ddc375e7063..528e39a1c2dd 100644 --- a/drivers/vfio/vfio_iommu_type1.c +++ b/drivers/vfio/vfio_iommu_type1.c @@ -384,6 +384,8 @@ static int vaddr_get_pfn(struct mm_struct *mm, unsigned long vaddr, down_read(&mm->mmap_sem); + vaddr = untagged_addr(vaddr); + vma = find_vma_intersection(mm, vaddr, vaddr + 1); if (vma && vma->vm_flags & VM_PFNMAP) { -- 2.22.0.rc1.311.g5d7573a151-goog _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel