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s=20161025; h=x-gm-message-state:date:in-reply-to:message-id:mime-version :references:subject:from:to:cc; bh=Qo5FEqXeJKdpmXvqV1aNmsvS1qf4QOcuAEvGRZnbU+I=; b=r/HKP/IOwjmEP50KF773S72yODhB8EtlQOcdfTRzb0PWSjs+fLPj59HRvFdk7LBwih d9o6klel8IK3UYckSDtVSQOHQz8K4457Cb+YjCF1oaQX85AmJ/O65G5dYK7MFAG7hNBM x3Eeuth0UFwZw1MJCC4odrKzgfJPnGZd/yRTvT02/6/BSjHaFNTxs19So5N9oIgXbhOA qlGSl6GV3RJM4Q3Q5ZKmGwA0Zd1+1zmTvszViFXZ0kS2WWbbjjeRkxszED3zDIZmHDDK VIBcxVsRiL6jwgKHBGNfYVa+VqZXzdZslqGOEodRCEedsn2CnUb66mI6/I7a+dHpT8J5 mmEg== X-Gm-Message-State: APjAAAVhVH44e2B8xXwXKxMKwDmCZcvNLT2HyuijlWps52VNCMPLnCpq JbB4YD81fJ6IfoYiXi8Ctsp2pBCwtRD6CVrq1Cg7zw6yCSzuG5PyZi9EkBPPINZPP4cN8CZBGlT MOT+UNqXCcdqJd49o4WQRDsJsA+evG0/L6xK1UqkXUqCSle0EUz6xnoGuGSmwWnizJAkbCKsSmf pPfWz8JxtJrDKgiSk= 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 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20190430_062610_309657_A1DA4122 X-CRM114-Status: GOOD ( 11.12 ) 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 , Koenig@google.com, Szabolcs Nagy , Catalin Marinas , Will Deacon , Kostya Serebryany , Chintan Pandya , Felix , Vincenzo Frascino , Jacob Bramley , Leon Romanovsky , Kuehling@google.com, Dave Martin , Evgeniy Stepanov , Kevin Brodsky , Kees Cook , Ruben Ayrapetyan , Andrey Konovalov , Ramana Radhakrishnan , Deucher@google.com, Alex Williamson , Mauro Carvalho Chehab , Dmitry Vyukov , Greg Kroah-Hartman , Yishai Hadas , Jens Wiklander , Lee Smith , Alexander , Andrew Morton , Robin Murphy , Christian , Luc Van Oostenryck Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org 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) {