netdev - Re: [PATCH v5 13/29] compat_ioctl: move more drivers to compat_ptr

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Date:   Tue, 30 Jul 2019 13:14:52 -0700
From:   Dan Williams <dan.j.williams@...el.com>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     Alexander Viro <viro@...iv.linux.org.uk>,
        linux-iio@...r.kernel.org, Daniel Vetter <daniel.vetter@...ll.ch>,
        linux-pci@...r.kernel.org, linux-nvme@...ts.infradead.org,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        sparclinux@...r.kernel.org,
        Mauro Carvalho Chehab <mchehab+samsung@...nel.org>,
        linux-scsi <linux-scsi@...r.kernel.org>,
        linux-nvdimm <linux-nvdimm@...ts.01.org>,
        linux-rdma <linux-rdma@...r.kernel.org>, qat-linux@...el.com,
        amd-gfx list <amd-gfx@...ts.freedesktop.org>,
        Jason Gunthorpe <jgg@...lanox.com>,
        linux-input@...r.kernel.org, Darren Hart <dvhart@...radead.org>,
        "Linux-media@...r.kernel.org" <linux-media@...r.kernel.org>,
        linux-remoteproc@...r.kernel.org,
        "moderated list:DMA BUFFER SHARING FRAMEWORK" 
        <linaro-mm-sig@...ts.linaro.org>,
        Maling list - DRI developers 
        <dri-devel@...ts.freedesktop.org>,
        Jonathan Cameron <Jonathan.Cameron@...wei.com>,
        David Sterba <dsterba@...e.com>,
        platform-driver-x86@...r.kernel.org,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        USB list <linux-usb@...r.kernel.org>,
        Linux Wireless List <linux-wireless@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        tee-dev@...ts.linaro.org,
        linux-crypto <linux-crypto@...r.kernel.org>,
        Netdev <netdev@...r.kernel.org>,
        linux-fsdevel <linux-fsdevel@...r.kernel.org>,
        linux-btrfs@...r.kernel.org
Subject: Re: [PATCH v5 13/29] compat_ioctl: move more drivers to compat_ptr_ioctl

On Tue, Jul 30, 2019 at 12:59 PM Arnd Bergmann <arnd@...db.de> wrote:
>
> The .ioctl and .compat_ioctl file operations have the same prototype so
> they can both point to the same function, which works great almost all
> the time when all the commands are compatible.
>
> One exception is the s390 architecture, where a compat pointer is only
> 31 bit wide, and converting it into a 64-bit pointer requires calling
> compat_ptr(). Most drivers here will never run in s390, but since we now
> have a generic helper for it, it's easy enough to use it consistently.
>
> I double-checked all these drivers to ensure that all ioctl arguments
> are used as pointers or are ignored, but are not interpreted as integer
> values.
>
> Acked-by: Jason Gunthorpe <jgg@...lanox.com>
> Acked-by: Daniel Vetter <daniel.vetter@...ll.ch>
> Acked-by: Mauro Carvalho Chehab <mchehab+samsung@...nel.org>
> Acked-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
> Acked-by: David Sterba <dsterba@...e.com>
> Acked-by: Darren Hart (VMware) <dvhart@...radead.org>
> Acked-by: Jonathan Cameron <Jonathan.Cameron@...wei.com>
> Acked-by: Bjorn Andersson <bjorn.andersson@...aro.org>
> Signed-off-by: Arnd Bergmann <arnd@...db.de>
> ---
>  drivers/nvdimm/bus.c                        | 4 ++--
[..]
> diff --git a/drivers/nvdimm/bus.c b/drivers/nvdimm/bus.c
> index 798c5c4aea9c..6ca142d833ab 100644
> --- a/drivers/nvdimm/bus.c
> +++ b/drivers/nvdimm/bus.c
> @@ -1229,7 +1229,7 @@ static const struct file_operations nvdimm_bus_fops = {
>         .owner = THIS_MODULE,
>         .open = nd_open,
>         .unlocked_ioctl = bus_ioctl,
> -       .compat_ioctl = bus_ioctl,
> +       .compat_ioctl = compat_ptr_ioctl,
>         .llseek = noop_llseek,
>  };
>
> @@ -1237,7 +1237,7 @@ static const struct file_operations nvdimm_fops = {
>         .owner = THIS_MODULE,
>         .open = nd_open,
>         .unlocked_ioctl = dimm_ioctl,
> -       .compat_ioctl = dimm_ioctl,
> +       .compat_ioctl = compat_ptr_ioctl,
>         .llseek = noop_llseek,
>  };

Acked-by: Dan Williams <dan.j.williams@...el.com>