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[209.85.220.73]) by mx.google.com with SMTPS id j23sor11747451pgh.83.2019.04.30.06.26.07 for (Google Transport Security); Tue, 30 Apr 2019 06:26:08 -0700 (PDT) Received-SPF: pass (google.com: domain of 370zixaokcjy0d3h4oadlb6ee6b4.2ecb8dkn-ccal02a.eh6@flex--andreyknvl.bounces.google.com designates 209.85.220.73 as permitted sender) client-ip=209.85.220.73; Authentication-Results: mx.google.com; dkim=pass header.i=@google.com header.s=20161025 header.b=WJvgA7Fh; spf=pass (google.com: domain of 370zixaokcjy0d3h4oadlb6ee6b4.2ecb8dkn-ccal02a.eh6@flex--andreyknvl.bounces.google.com designates 209.85.220.73 as permitted sender) smtp.mailfrom=370zIXAoKCJY0D3H4OADLB6EE6B4.2ECB8DKN-CCAL02A.EH6@flex--andreyknvl.bounces.google.com; dmarc=pass (p=REJECT sp=REJECT dis=NONE) header.from=google.com DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20161025; h=date:in-reply-to:message-id:mime-version:references:subject:from:to :cc; bh=Qo5FEqXeJKdpmXvqV1aNmsvS1qf4QOcuAEvGRZnbU+I=; b=WJvgA7FhPH4nnlwUD7/cK+UGsQvztnpEwl/EwgwpETKSn2jcm2n8vXAJ5vmz+updJQ hv5vQG7S1TSnGIvsNFWmNlDJOuMgBbHPDTDqE1/Q7BSkSWZGsQSxWFmbI9EyZ11RD35O PoWicUER0x2L/roTgi03inDjhawM/RefWqQ0HU9dp3Bfb6piRBIYbrmvMjy86XgTN3si Ctsvudz1bGthwFBvr6qlHQElPSiMTUZTlDJzHWjXIK5Av3TkDr+6XQPdcLfX/oczYas3 y01MzwmNMMd59RGZLYJMIFoZY0gr9B1FAyRfwBPJvm7Zd8dDqsp5xcnwSnBCo7S+GHIh eAtA== X-Google-Smtp-Source: APXvYqzC1lVWU3xOxPIpeGY1IySKfn9D9N99TINTSZcSwcwIPCbrd75tIMQec4oX3DSqqzuBnQc6miaAqMAhwGUH X-Received: by 2002:a63:1d4f:: with SMTP id d15mr64183239pgm.347.1556630767405; Tue, 30 Apr 2019 06:26:07 -0700 (PDT) Date: Tue, 30 Apr 2019 15:25:12 +0200 In-Reply-To: Message-Id: Mime-Version: 1.0 References: X-Mailer: git-send-email 2.21.0.593.g511ec345e18-goog Subject: [PATCH v14 16/17] 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 Cc: Catalin Marinas , Vincenzo Frascino , Will Deacon , Mark Rutland , Andrew Morton , Greg Kroah-Hartman , Kees Cook , Yishai Hadas , Kuehling@google.com, Felix , Deucher@google.com, Alexander , Koenig@google.com, Christian , Mauro Carvalho Chehab , Jens Wiklander , Alex Williamson , Leon Romanovsky , Dmitry Vyukov , Kostya Serebryany , Evgeniy Stepanov , Lee Smith , Ramana Radhakrishnan , Jacob Bramley , Ruben Ayrapetyan , Robin Murphy , Chintan Pandya , Luc Van Oostenryck , Dave Martin , Kevin Brodsky , Szabolcs Nagy , Andrey Konovalov Content-Type: text/plain; charset="UTF-8" X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: 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 d0f731c9920a..5daa966d799e 100644 --- a/drivers/vfio/vfio_iommu_type1.c +++ b/drivers/vfio/vfio_iommu_type1.c @@ -382,6 +382,8 @@ 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) { -- 2.21.0.593.g511ec345e18-goog