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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=/YALAWfXM1Ec4B1lOAT/D+NA+cyFiVncn64tZ/r98OM=; b=Y7HD27CqBf03gaDbpY61i6BoN7XNWgntIswoNmLcIJXzvo54GltfBsd6YXFsycJ06a l2r76brRIl7e75I7vOVh7XwUDv3vAKYVOPQgLtseltKGB+jO2yaMK6lPXUVACO06Y7hb Tv4XUtrEG+X2mnQBCef+ssvw+CJfH4qPo7IMgUlHcSoJOjzXFc2AkImNINCXnSjoNZrW dJtOiFdND8xClQzMGU6D7OcjZEt6rZzX/T96hgcRJ2CYqUMApCRTJdJ3VXupiafkg9rJ n0QY7iviy8YQ8UNfjRSiEb1rZE+rlTKbcfqWiuMoK7rAokBAHbMJb7S+yRpNwsn0Oa2J WupA== X-Gm-Message-State: APjAAAWifUgu0acSusVLmVEC8Qb4Wsqujy9kMTXXtFNYMadzA3d/dbu9 l97j+djiEZQeJi2QzIt64QkKIHNgU2cFszqoSgVgCHZ9dGSlMkqSNk/u5qw+k8Cm7aAyjKXtAa6 3ewgAbVhyiiO6DR9Rqk9gVsuLakny8o166Oyms75QMQff6ChqbcWJ32XOTZJPi+hejdGAoz7xQV oAhZLF5d1I/A/3ib0= X-Google-Smtp-Source: APXvYqzcPL+MfuI0G9Nd/HSZW5720Hxob5Qe3sb32I8/yavc0Ub0kNUbvXmDnUxRuwL2tRyo+O0TaelZxw+BF2mv X-Received: by 2002:a1f:7dc2:: with SMTP id y185mr1688822vkc.51.1561386830607; Mon, 24 Jun 2019 07:33:50 -0700 (PDT) Date: Mon, 24 Jun 2019 16:32:59 +0200 In-Reply-To: Message-Id: <125994bfab8f29da8f58c8fcd0d94ef4bf55b3ea.1561386715.git.andreyknvl@google.com> Mime-Version: 1.0 References: X-Mailer: git-send-email 2.22.0.410.gd8fdbe21b5-goog Subject: [PATCH v18 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 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20190624_073353_682386_A1A12222 X-CRM114-Status: GOOD ( 11.24 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 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 , Eric Auger , 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 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 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 add34adfadc7..7b8283e33d10 100644 --- a/drivers/vfio/vfio_iommu_type1.c +++ b/drivers/vfio/vfio_iommu_type1.c @@ -381,6 +381,8 @@ 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) {