This is a note to let you know that I've just added the patch titled
IB/mlx5: Take write semaphore when changing the vma struct
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-take-write-semaphore-when-changing-the-vma-struct.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 06:03:02 +0300
Subject: IB/mlx5: Take write semaphore when changing the vma struct
From: Maor Gottlieb <maorg@xxxxxxxxxxxx>
[ Upstream commit ecc7d83be3243835c9396a1a2fb8ce95f205207b ]
When the driver disassociate user context, it changes the vma to
anonymous by setting the vm_ops to null and zap the vma ptes.
In order to avoid race in the kernel, we need to take write lock
before we change the vma entries.
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 | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
--- a/drivers/infiniband/hw/mlx5/main.c
+++ b/drivers/infiniband/hw/mlx5/main.c
@@ -1313,7 +1313,7 @@ static void mlx5_ib_disassociate_ucontex
/* need to protect from a race on closing the vma as part of
* mlx5_ib_vma_close.
*/
- down_read(&owning_mm->mmap_sem);
+ down_write(&owning_mm->mmap_sem);
list_for_each_entry_safe(vma_private, n, &context->vma_private_list,
list) {
vma = vma_private->vma;
@@ -1327,7 +1327,7 @@ static void mlx5_ib_disassociate_ucontex
list_del(&vma_private->list);
kfree(vma_private);
}
- up_read(&owning_mm->mmap_sem);
+ up_write(&owning_mm->mmap_sem);
mmput(owning_mm);
put_task_struct(owning_process);
}
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