Commit 9ec4483a authored by Yishai Hadas's avatar Yishai Hadas Committed by Jason Gunthorpe

IB/mlx5: Move MRs to a kernel PD when freeing them to the MR cache

Fix unreg_umr to move the MR to a kernel owned PD (i.e. the UMR PD) which
can't be accessed by userspace.

This ensures that nothing can continue to access the MR once it has been
placed in the kernels cache for reuse.

MRs in the cache continue to have their HW state, including DMA tables,
present. Even though the MR has been invalidated, changing the PD provides
an additional layer of protection against use of the MR.

Link: https://lore.kernel.org/r/20190723065733.4899-5-leon@kernel.org
Cc: <stable@vger.kernel.org> # 3.10
Fixes: e126ba97 ("mlx5: Add driver for Mellanox Connect-IB adapters")
Signed-off-by: default avatarYishai Hadas <yishaih@mellanox.com>
Reviewed-by: default avatarArtemy Kovalyov <artemyko@mellanox.com>
Signed-off-by: default avatarLeon Romanovsky <leonro@mellanox.com>
Reviewed-by: default avatarJason Gunthorpe <jgg@mellanox.com>
Signed-off-by: default avatarJason Gunthorpe <jgg@mellanox.com>
parent afd14174
......@@ -1375,8 +1375,10 @@ static int unreg_umr(struct mlx5_ib_dev *dev, struct mlx5_ib_mr *mr)
if (mdev->state == MLX5_DEVICE_STATE_INTERNAL_ERROR)
return 0;
umrwr.wr.send_flags = MLX5_IB_SEND_UMR_DISABLE_MR;
umrwr.wr.send_flags = MLX5_IB_SEND_UMR_DISABLE_MR |
MLX5_IB_SEND_UMR_UPDATE_PD_ACCESS;
umrwr.wr.opcode = MLX5_IB_WR_UMR;
umrwr.pd = dev->umrc.pd;
umrwr.mkey = mr->mmkey.key;
umrwr.ignore_free_state = 1;
......
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