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[209.85.220.73]) by mx.google.com with SMTPS id w7sor1844907ybe.185.2019.05.06.09.31.57 for (Google Transport Security); Mon, 06 May 2019 09:31:57 -0700 (PDT) Received-SPF: pass (google.com: domain of 3fghqxaokcg0lyocpjvygwrzzrwp.nzxwtyfi-xxvglnv.zcr@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=CbTDaybx; spf=pass (google.com: domain of 3fghqxaokcg0lyocpjvygwrzzrwp.nzxwtyfi-xxvglnv.zcr@flex--andreyknvl.bounces.google.com designates 209.85.220.73 as permitted sender) smtp.mailfrom=3fGHQXAoKCG0LYOcPjVYgWRZZRWP.NZXWTYfi-XXVgLNV.ZcR@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=40kxRsKyA2BTdfRG/8ycbW9cjWXHDWQTNAmN4QMp2Tc=; b=CbTDaybxwiO68FYaqEU987JbmTIWC/O/zmn5u4LAT2NjIg4zrx3ZZpTdEat2IZI7Zr UMjh3JrD6tSSJSHiA2J1SvwKqxkOFH9jD5t4pSSsFkT8XO0YzO5s2D93y2Fvv558QDT8 PC2RKfy08bb/yMf67M9jkhQd5jNijh0tU+IEPR6RStdwOkRtKLjro1177XiqKVVA8CKn 7nvBlr71nBnQ+GeGRfOaL9uXIjXsWpEFZPxFZ6iufv0v5siPwgW5vA64wYvStilJ/+ml T4dkOygYLm3ryZPhfxVQJsF9+4XGOGyyv3U3USZs8bMzVBnZRwvcMGmsqol00hqY8fWp TxbQ== X-Google-Smtp-Source: APXvYqy7sMh67zqP2gW9MSWmQP0vNhHkuufaU8XQ9cxxJZb1a1Qrmr7t2Ui4wSymuQ40ovJdWXqcMvlrm4Ub8jqq X-Received: by 2002:a25:c5c8:: with SMTP id v191mr18795942ybe.52.1557160316771; Mon, 06 May 2019 09:31:56 -0700 (PDT) Date: Mon, 6 May 2019 18:31:02 +0200 In-Reply-To: Message-Id: <69a675a5c48fa2572162338c51a1bfa2a3ced27d.1557160186.git.andreyknvl@google.com> Mime-Version: 1.0 References: X-Mailer: git-send-email 2.21.0.1020.gf2820cf01a-goog Subject: [PATCH v15 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 , Felix Kuehling , Alexander Deucher , Christian Koenig , 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 , Luc Van Oostenryck , Dave Martin , Kevin Brodsky , Szabolcs Nagy , Andrey Konovalov 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: X-Virus-Scanned: ClamAV using ClamSMTP 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) {