Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S934271AbaFJAWN (ORCPT ); Mon, 9 Jun 2014 20:22:13 -0400 Received: from mail.linuxfoundation.org ([140.211.169.12]:58173 "EHLO mail.linuxfoundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754346AbaFJAWI (ORCPT ); Mon, 9 Jun 2014 20:22:08 -0400 From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Sasha Levin , Will Deacon , Rusty Russell , Ben Hutchings , Yijing Wang Subject: [PATCH 3.4 49/88] virtio: 9p: correctly pass physical address to userspace for high pages Date: Mon, 9 Jun 2014 17:24:59 -0700 Message-Id: <20140610002426.158546523@linuxfoundation.org> X-Mailer: git-send-email 1.9.0 In-Reply-To: <20140610002424.500996570@linuxfoundation.org> References: <20140610002424.500996570@linuxfoundation.org> User-Agent: quilt/0.63-1 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 3.4-stable review patch. If anyone has any objections, please let me know. ------------------ From: Will Deacon commit 30d395b124c51db66d9f3ba0611cd62021afc392 upstream. commit b9cdc88df8e63e81c723b82c286fc97f5d0dc325 upstream. When using a virtio transport, the 9p net device may pass the physical address of a kernel buffer to userspace via a scatterlist inside a virtqueue. If the kernel buffer is mapped outside of the linear mapping (e.g. highmem), then virt_to_page will return a bogus value and we will populate the scatterlist with junk. This patch uses kmap_to_page when populating the page array for a kernel buffer. Cc: Sasha Levin Signed-off-by: Will Deacon Signed-off-by: Rusty Russell Signed-off-by: Ben Hutchings Cc: Yijing Wang Signed-off-by: Greg Kroah-Hartman --- net/9p/trans_virtio.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) --- a/net/9p/trans_virtio.c +++ b/net/9p/trans_virtio.c @@ -39,6 +39,7 @@ #include #include #include +#include #include #include #include @@ -325,7 +326,7 @@ static int p9_get_mapped_pages(struct vi int count = nr_pages; while (nr_pages) { s = rest_of_page(data); - pages[index++] = virt_to_page(data); + pages[index++] = kmap_to_page(data); data += s; nr_pages--; } -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/