From patchwork Wed Mar 20 14:51:20 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Andrey Konovalov X-Patchwork-Id: 10863087 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 90CF91575 for ; Thu, 21 Mar 2019 08:25:00 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 76DFF29F21 for ; Thu, 21 Mar 2019 08:25:00 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 69A0E29F86; Thu, 21 Mar 2019 08:25:00 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-5.2 required=2.0 tests=BAYES_00,DKIM_ADSP_CUSTOM_MED, MAILING_LIST_MULTI,RCVD_IN_DNSWL_MED autolearn=ham version=3.3.1 Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) (using TLSv1.2 with cipher DHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id 2AB1729F21 for ; Thu, 21 Mar 2019 08:25:00 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id B6D3C89F8B; Thu, 21 Mar 2019 08:24:19 +0000 (UTC) X-Original-To: dri-devel@lists.freedesktop.org Delivered-To: dri-devel@lists.freedesktop.org Received: from mail-vs1-xe4a.google.com (mail-vs1-xe4a.google.com [IPv6:2607:f8b0:4864:20::e4a]) by gabe.freedesktop.org (Postfix) with ESMTPS id 9BF2C89F53 for ; Wed, 20 Mar 2019 14:52:03 +0000 (UTC) Received: by mail-vs1-xe4a.google.com with SMTP id m16so859598vsp.14 for ; Wed, 20 Mar 2019 07:52:03 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:in-reply-to:message-id:mime-version :references:subject:from:to:cc; bh=o/tjHBN+YdVOHlZBhUHSY9iDnhLS0V50uWJeHP43be4=; b=Bfyn0E545LXzM6xWe2gyaAkCbp15HE+rwtn72+BnUv1evurF6YGCbQt+dN8Hz7ahFg 80FhXHjPUfew5wKSzWfnxNSUnF3SXum3M9LJCyt0TpduUJepAMK9hxAae24vVaanlw8P tZq3LSPMOBqjSwGM+GX3ISY2ties1M5zdwZcsAJa1qrOtKFgXe77DlJp1zfr2iTOiIh+ WpYUP7DKn6OnhJPjAbTxF0bMMpiCR0cQtfPjh8lVZU01RxgYvNXmH9kav/FtYjEWr6cz b9vfgXyFg0pO2mE8BmetlaBfJBeyM8DrNXpcClEmTUx+UqUEX1xuYIuRW6cExPrXONiQ d7fw== X-Gm-Message-State: APjAAAWkQmwhighpomJaQ/Wx+Dbp0h+UIlBOx7HttKVJE7Vw+vZTd/bh L1dtQrwWZcRuLcAlKVhxuJFVqUZ8XTqmTKZr X-Google-Smtp-Source: APXvYqyHOngs34In5uhQcXPzOfQqpf0ARHPrNyLHXpzz5ogONfScZvSMOj1YE9ihREsOQQ2kQeo8TqNX7xzilecW X-Received: by 2002:a67:7651:: with SMTP id r78mr6363022vsc.39.1553093522664; Wed, 20 Mar 2019 07:52:02 -0700 (PDT) Date: Wed, 20 Mar 2019 15:51:20 +0100 In-Reply-To: Message-Id: Mime-Version: 1.0 References: X-Mailer: git-send-email 2.21.0.225.g810b269d1ac-goog Subject: [PATCH v13 06/20] mm, arm64: untag user pointers in get_vaddr_frames From: Andrey Konovalov To: Catalin Marinas , Will Deacon , Mark Rutland , Robin Murphy , Kees Cook , Kate Stewart , Greg Kroah-Hartman , Andrew Morton , Ingo Molnar , "Kirill A . Shutemov" , Shuah Khan , Vincenzo Frascino , Eric Dumazet , "David S. Miller" , Alexei Starovoitov , Daniel Borkmann , Steven Rostedt , Ingo Molnar , Peter Zijlstra , Arnaldo Carvalho de Melo , Alex Deucher , " =?utf-8?q?Christian_K=C3=B6ni?= =?utf-8?q?g?= " , "David (ChunMing) Zhou" , Yishai Hadas , Mauro Carvalho Chehab , Jens Wiklander , Alex Williamson , linux-arm-kernel@lists.infradead.org, linux-mm@kvack.org, linux-arch@vger.kernel.org, netdev@vger.kernel.org, bpf@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, linux-kernel@vger.kernel.org X-Mailman-Approved-At: Thu, 21 Mar 2019 08:23:39 +0000 X-Mailman-Original-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=o/tjHBN+YdVOHlZBhUHSY9iDnhLS0V50uWJeHP43be4=; b=A+JYGhZ3fQkhscb6lUBmQ1muz6oemHopDmPki/B278rzjZ0dk/UjohSsOxEu8keiCi W5/VXLZ67gUh0RZN3rq5skpPYsUC7oWDq+tl+3khHwdNxCrmhkhxq7w99dcsLgc3Elx7 dmeBy427vSPfFNaJS7DfUhAb/Fwd/EACn2TYRVMksoGnObzxZTWUPnBuSuAiS/JRvPZA f0EsOCj85jPSuENzq/Bg7zakYTOA4bo6fX1BKjPllZeRcF3GtXBJjjiVIF4U6HkOW9id X49/giQrlJvYsmuoQtVxMGCVLZT2pR3apmEVULZaKks3LsI2Ip7Pr6oRl+H4swKOnmZR D5tA== X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Kevin Brodsky , Chintan Pandya , Jacob Bramley , Ruben Ayrapetyan , Szabolcs Nagy , Andrey Konovalov , Lee Smith , Kostya Serebryany , Dmitry Vyukov , Ramana Radhakrishnan , Luc Van Oostenryck , Dave Martin , Evgeniy Stepanov Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" 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. get_vaddr_frames uses provided user pointers for vma lookups, which can only by done with untagged pointers. Instead of locating and changing all callers of this function, perform untagging in it. Signed-off-by: Andrey Konovalov --- mm/frame_vector.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/mm/frame_vector.c b/mm/frame_vector.c index c64dca6e27c2..c431ca81dad5 100644 --- a/mm/frame_vector.c +++ b/mm/frame_vector.c @@ -46,6 +46,8 @@ int get_vaddr_frames(unsigned long start, unsigned int nr_frames, if (WARN_ON_ONCE(nr_frames > vec->nr_allocated)) nr_frames = vec->nr_allocated; + start = untagged_addr(start); + down_read(&mm->mmap_sem); locked = 1; vma = find_vma_intersection(mm, start, start + 1);