This is a note to let you know that I've just added the patch titled
xen/blkback: Don't trust the handle from the frontend.
to the 3.4-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:
xen-blkback-don-t-trust-the-handle-from-the-frontend.patch
and it can be found in the queue-3.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 01c681d4c70d64cb72142a2823f27c4146a02e63 Mon Sep 17 00:00:00 2001
From: Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>
Date: Wed, 16 Jan 2013 11:36:23 -0500
Subject: xen/blkback: Don't trust the handle from the frontend.
From: Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>
commit 01c681d4c70d64cb72142a2823f27c4146a02e63 upstream.
The 'handle' is the device that the request is from. For the life-time
of the ring we copy it from a request to a response so that the frontend
is not surprised by it. But we do not need it - when we start processing
I/Os we have our own 'struct phys_req' which has only most essential
information about the request. In fact the 'vbd_translate' ends up
over-writing the preq.dev with a value from the backend.
This assignment of preq.dev with the 'handle' value is superfluous
so lets not do it.
Acked-by: Jan Beulich <jbeulich@xxxxxxxx>
Acked-by: Ian Campbell <ian.campbell@xxxxxxxxxx>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/block/xen-blkback/blkback.c | 1 -
1 file changed, 1 deletion(-)
--- a/drivers/block/xen-blkback/blkback.c
+++ b/drivers/block/xen-blkback/blkback.c
@@ -623,7 +623,6 @@ static int dispatch_rw_block_io(struct x
goto fail_response;
}
- preq.dev = req->u.rw.handle;
preq.sector_number = req->u.rw.sector_number;
preq.nr_sects = 0;
Patches currently in stable-queue which might be from konrad.wilk@xxxxxxxxxx are
queue-3.4/doc-kernel-parameters-document-console-hvc-n.patch
queue-3.4/xen-blkback-do-not-leak-mode-property.patch
queue-3.4/xen-blkback-don-t-trust-the-handle-from-the-frontend.patch
queue-3.4/doc-xen-mention-earlyprintk-xen-in-the-documentation.patch
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