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[209.85.220.73]) by mx.google.com with SMTPS id i6sor58164535qtm.38.2019.07.23.10.59.52 for (Google Transport Security); Tue, 23 Jul 2019 10:59:52 -0700 (PDT) Received-SPF: pass (google.com: domain of 3f0s3xqokchoylbpcwiltjemmejc.amkjglsv-kkityai.mpe@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=t2L6A3co; spf=pass (google.com: domain of 3f0s3xqokchoylbpcwiltjemmejc.amkjglsv-kkityai.mpe@flex--andreyknvl.bounces.google.com designates 209.85.220.73 as permitted sender) smtp.mailfrom=3F0s3XQoKCHoYlbpcwiltjemmejc.amkjglsv-kkitYai.mpe@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=bykoKqk+RfxIttYDE7/GdnEkPwV+NEF/LkGgW6aheBM=; b=t2L6A3co0IUcO5jJEupAYqmfSwA1Pmfl3+ZcIn/5Q85mp2WLmhw1iqLCswQ9as3aOF a0D+pYMEhkdmm+KSqXmSiU/lD0Pz3h6uvkPAeVEHs1IFoAwnv5BA1YbF3d7nwG6M8iRR Z5NEOhmfG5y3nopQ695DATYQQfXAIYJG7yd7F+lB9VoEza1F669VXhs6jrCa2pvOvN6l r1p+w7pUdDXihW/3CqVYzRnheU9A6fqtUiCr4NASapwor3nhJC+/jeMNYPGIPNIFjoFu E4g9GrA8tUOQtGrCF4JaEQ7hr5aZJYBDV43aYbaG/BPoNEA3mTX8DLrogiBkcDNJOYJ5 rrBA== X-Google-Smtp-Source: APXvYqzy6KvMjkfI7Gkvl5k12zd++ICAyNUe8J8soJHrycJkzCW148ZA79khH20QvBebUrjeGJ/TSw9Gqxxo1fEA X-Received: by 2002:ac8:7251:: with SMTP id l17mr54199388qtp.277.1563904791730; Tue, 23 Jul 2019 10:59:51 -0700 (PDT) Date: Tue, 23 Jul 2019 19:58:51 +0200 In-Reply-To: Message-Id: <87422b4d72116a975896f2b19b00f38acbd28f33.1563904656.git.andreyknvl@google.com> Mime-Version: 1.0 References: X-Mailer: git-send-email 2.22.0.709.g102302147b-goog Subject: [PATCH v19 14/15] vfio/type1: 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 , Luc Van Oostenryck , Dave Martin , Khalid Aziz , enh , Jason Gunthorpe , Christoph Hellwig , Dmitry Vyukov , Kostya Serebryany , Evgeniy Stepanov , Lee Smith , Ramana Radhakrishnan , Jacob Bramley , Ruben Ayrapetyan , Robin Murphy , Kevin Brodsky , Szabolcs Nagy , Andrey Konovalov , Eric Auger 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 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. Reviewed-by: Eric Auger Reviewed-by: Vincenzo Frascino Reviewed-by: Catalin Marinas Reviewed-by: Kees Cook 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 054391f30fa8..67a24b4d0fa4 100644 --- a/drivers/vfio/vfio_iommu_type1.c +++ b/drivers/vfio/vfio_iommu_type1.c @@ -368,6 +368,8 @@ 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) { -- 2.22.0.709.g102302147b-goog