From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Return-Path: Subject: Patch "virtio: 9p: correctly pass physical address to userspace for high pages" has been added to the 3.7-stable tree To: will.deacon@arm.com,gregkh@linuxfoundation.org,levinsasha928@gmail.com,rusty@rustcorp.com.au Cc: , From: Date: Tue, 08 Jan 2013 10:27:08 -0800 Message-ID: <13576696283184@kroah.org> MIME-Version: 1.0 Content-Type: text/plain; charset=ASCII Content-Transfer-Encoding: 8bit List-ID: This is a note to let you know that I've just added the patch titled virtio: 9p: correctly pass physical address to userspace for high pages to the 3.7-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: virtio-9p-correctly-pass-physical-address-to-userspace-for-high-pages.patch and it can be found in the queue-3.7 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let know about it. >>From b9cdc88df8e63e81c723b82c286fc97f5d0dc325 Mon Sep 17 00:00:00 2001 From: Will Deacon Date: Fri, 19 Oct 2012 14:03:32 +0100 Subject: virtio: 9p: correctly pass physical address to userspace for high pages From: Will Deacon 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. Signed-off-by: Will Deacon Cc: Sasha Levin Signed-off-by: Rusty Russell 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--; } Patches currently in stable-queue which might be from will.deacon@arm.com are queue-3.7/mm-highmem-export-kmap_to_page-for-modules.patch queue-3.7/arm64-signal-push-the-unwinding-prologue-on-the-signal-stack.patch queue-3.7/virtio-9p-correctly-pass-physical-address-to-userspace-for-high-pages.patch queue-3.7/virtio-force-vring-descriptors-to-be-allocated-from-lowmem.patch