This is a note to let you know that I've just added the patch titled
IB/mlx5: Change vma from shared to private
to the 4.9-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:
ib-mlx5-change-vma-from-shared-to-private.patch
and it can be found in the queue-4.9 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From foo@baz Thu Mar 22 14:40:23 CET 2018
From: Maor Gottlieb <maorg@xxxxxxxxxxxx>
Date: Wed, 29 Mar 2017 06:03:03 +0300
Subject: IB/mlx5: Change vma from shared to private
From: Maor Gottlieb <maorg@xxxxxxxxxxxx>
[ Upstream commit 1377661298d2820d675553d186c31b6f46c140d0 ]
Anonymous VMA (->vm_ops == NULL) cannot be shared, otherwise
it would lead to SIGBUS.
Remove the shared flags from the vma after we change it to be
anonymous.
This is easily reproduced by doing modprobe -r while running a
user-space application such as raw_ethernet_bw.
Fixes: 7c2344c3bbf97 ('IB/mlx5: Implements disassociate_ucontext API')
Signed-off-by: Maor Gottlieb <maorg@xxxxxxxxxxxx>
Signed-off-by: Leon Romanovsky <leon@xxxxxxxxxx>
Signed-off-by: Doug Ledford <dledford@xxxxxxxxxx>
Signed-off-by: Sasha Levin <alexander.levin@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/infiniband/hw/mlx5/main.c | 1 +
1 file changed, 1 insertion(+)
--- a/drivers/infiniband/hw/mlx5/main.c
+++ b/drivers/infiniband/hw/mlx5/main.c
@@ -1323,6 +1323,7 @@ static void mlx5_ib_disassociate_ucontex
/* context going to be destroyed, should
* not access ops any more.
*/
+ vma->vm_flags &= ~(VM_SHARED | VM_MAYSHARE);
vma->vm_ops = NULL;
list_del(&vma_private->list);
kfree(vma_private);
Patches currently in stable-queue which might be from maorg@xxxxxxxxxxxx are
queue-4.9/ib-mlx4-change-vma-from-shared-to-private.patch
queue-4.9/ib-mlx5-take-write-semaphore-when-changing-the-vma-struct.patch
queue-4.9/ib-mlx5-change-vma-from-shared-to-private.patch
queue-4.9/ib-mlx4-take-write-semaphore-when-changing-the-vma-struct.patch