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 <[email protected]> know about it.
>From b9cdc88df8e63e81c723b82c286fc97f5d0dc325 Mon Sep 17 00:00:00 2001
From: Will Deacon <[email protected]>
Date: Fri, 19 Oct 2012 14:03:32 +0100
Subject: virtio: 9p: correctly pass physical address to userspace for high pages
From: Will Deacon <[email protected]>
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 <[email protected]>
Cc: Sasha Levin <[email protected]>
Signed-off-by: Rusty Russell <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
---
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 <linux/inet.h>
#include <linux/idr.h>
#include <linux/file.h>
+#include <linux/highmem.h>
#include <linux/slab.h>
#include <net/9p/9p.h>
#include <linux/parser.h>
@@ -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 [email protected] 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
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