This is a note to let you know that I've just added the patch titled
xen/events/fifo: ensure all bitops are properly aligned even on x86
to the 3.14-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-events-fifo-ensure-all-bitops-are-properly-aligned-even-on-x86.patch
and it can be found in the queue-3.14 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From dcecb8fd93a65787130a74e61fdf29932c8d85eb Mon Sep 17 00:00:00 2001
From: David Vrabel <david.vrabel@xxxxxxxxxx>
Date: Thu, 31 Jul 2014 16:22:25 +0100
Subject: xen/events/fifo: ensure all bitops are properly aligned even on x86
From: David Vrabel <david.vrabel@xxxxxxxxxx>
commit dcecb8fd93a65787130a74e61fdf29932c8d85eb upstream.
When using the FIFO-based ABI on x86_64, if the last port is at the
end of an event array page then sync_test_bit() on this port's event
word will read beyond the end of the page and in certain circumstances
this may fault.
The fault requires the following page in the kernel's direct mapping
to be not present, which would mean:
a) the array page is the last page of RAM; or
b) the following page is ballooned out /and/ it has been used for a
foreign mapping by a kernel driver (such as netback or blkback)
/and/ the grant has been unmapped.
Use the infrastructure added for arm64 to ensure that all bitops
operating on event words are unsigned long aligned.
Signed-off-by: David Vrabel <david.vrabel@xxxxxxxxxx>
Reviewed-by: Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/xen/events/events_fifo.c | 5 ++---
1 file changed, 2 insertions(+), 3 deletions(-)
--- a/drivers/xen/events/events_fifo.c
+++ b/drivers/xen/events/events_fifo.c
@@ -67,10 +67,9 @@ static event_word_t *event_array[MAX_EVE
static unsigned event_array_pages __read_mostly;
/*
- * sync_set_bit() and friends must be unsigned long aligned on non-x86
- * platforms.
+ * sync_set_bit() and friends must be unsigned long aligned.
*/
-#if !defined(CONFIG_X86) && BITS_PER_LONG > 32
+#if BITS_PER_LONG > 32
#define BM(w) (unsigned long *)((unsigned long)w & ~0x7UL)
#define EVTCHN_FIFO_BIT(b, w) \
Patches currently in stable-queue which might be from david.vrabel@xxxxxxxxxx are
queue-3.14/x86-xen-use-vmap-to-map-grant-table-pages-in-pvh-guests.patch
queue-3.14/xen-events-fifo-ensure-all-bitops-are-properly-aligned-even-on-x86.patch
queue-3.14/x86-xen-resume-timer-irqs-early.patch
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