netdev - Re: [PATCH rdma-next 0/6] BAR mappings fixes in RDMA

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Date:   Wed, 24 Apr 2019 16:24:29 -0300
From:   Jason Gunthorpe <jgg@...pe.ca>
To:     Leon Romanovsky <leon@...nel.org>
Cc:     Doug Ledford <dledford@...hat.com>,
        Leon Romanovsky <leonro@...lanox.com>,
        RDMA mailing list <linux-rdma@...r.kernel.org>,
        Andrea Arcangeli <aarcange@...hat.com>,
        Feras Daoud <ferasda@...lanox.com>,
        Haggai Eran <haggaie@...lanox.com>,
        Saeed Mahameed <saeedm@...lanox.com>,
        linux-netdev <netdev@...r.kernel.org>
Subject: Re: [PATCH rdma-next 0/6] BAR mappings fixes in RDMA

On Tue, Apr 16, 2019 at 02:07:24PM +0300, Leon Romanovsky wrote:
> From: Leon Romanovsky <leonro@...lanox.com>
> 
> >From Jason,
> 
> Upon review it turns out there are some long standing problems in BAR
> mapping area:
>  * BAR pages are being allowed to be executable.
>  * BAR pages intended for read-only can be switched to writable via mprotect.
>  * Missing use of rdma_user_mmap_io for the mlx5 clock BAR page.
>  * Disassociate causes SIGBUS when touching the pages.
>  * CPU pages are being mapped through to the process via remap_pfn_range
>    instead of the more appropriate vm_insert_page, causing weird behaviors
>    during disassociation.
> 
> This series adds the missing VM_* flag manipulation, adds faulting a zero
> page for disassociation and revises the CPU page mappings to use vm_insert_page.
> 
> Thanks
> 
> Jason Gunthorpe (6):
>   RDMA/mlx5: Do not allow the user to write to the clock page
>   RDMA/mlx5: Use rdma_user_map_io for mapping BAR pages
>   RDMA/ucontext: Fix regression with disassociate

Applied to for-rc

>   RDMA/mlx5: Use get_zeroed_page() for clock_info
>   RDMA: Remove rdma_user_mmap_page

Applied to for-next

I dropped this patch:

>   RDMA/ucontext: Do not allow BAR mappings to be executable

Jason