linux-kernel - Re: [PATCH v2 02/17] compat_ioctl: move drivers to generic_compat_ioctl

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Message-ID: <20180912153300.GE5633@ziepe.ca>
Date:   Wed, 12 Sep 2018 09:33:00 -0600
From:   Jason Gunthorpe <jgg@...pe.ca>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     viro@...iv.linux.org.uk, linux-fsdevel@...r.kernel.org,
        Sudip Mukherjee <sudipm.mukherjee@...il.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Peter Huewe <peterhuewe@....de>,
        Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>,
        Stefan Richter <stefanr@...6.in-berlin.de>,
        Jiri Kosina <jikos@...nel.org>,
        Benjamin Tissoires <benjamin.tissoires@...hat.com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Tomas Winkler <tomas.winkler@...el.com>,
        Artem Bityutskiy <dedekind1@...il.com>,
        Marek Vasut <marek.vasut@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Alex Williamson <alex.williamson@...hat.com>,
        OGAWA Hirofumi <hirofumi@...l.parknet.co.jp>,
        linux-kernel@...r.kernel.org, linux-integrity@...r.kernel.org,
        linux1394-devel@...ts.sourceforge.net, linux-usb@...r.kernel.org,
        linux-input@...r.kernel.org, linux-mtd@...ts.infradead.org,
        netdev@...r.kernel.org, devel@...verdev.osuosl.org,
        kvm@...r.kernel.org, virtualization@...ts.linux-foundation.org
Subject: Re: [PATCH v2 02/17] compat_ioctl: move drivers to
 generic_compat_ioctl_ptrarg

On Wed, Sep 12, 2018 at 05:01:03PM +0200, Arnd Bergmann wrote:
> Each of these drivers has a copy of the same trivial helper function to
> convert the pointer argument and then call the native ioctl handler.
> 
> We now have a generic implementation of that, so use it.
> 
> Signed-off-by: Arnd Bergmann <arnd@...db.de>
>  drivers/char/ppdev.c              | 12 +---------
>  drivers/char/tpm/tpm_vtpm_proxy.c | 12 +---------
>  drivers/firewire/core-cdev.c      | 12 +---------
>  drivers/hid/usbhid/hiddev.c       | 11 +--------
>  drivers/hwtracing/stm/core.c      | 12 +---------
>  drivers/misc/mei/main.c           | 22 +----------------
>  drivers/mtd/ubi/cdev.c            | 36 +++-------------------------
>  drivers/net/tap.c                 | 12 +---------
>  drivers/staging/pi433/pi433_if.c  | 12 +---------
>  drivers/usb/core/devio.c          | 16 +------------
>  drivers/vfio/vfio.c               | 39 +++----------------------------
>  drivers/vhost/net.c               | 12 +---------
>  drivers/vhost/scsi.c              | 12 +---------
>  drivers/vhost/test.c              | 12 +---------
>  drivers/vhost/vsock.c             | 12 +---------
>  fs/fat/file.c                     | 13 +----------
>  16 files changed, 20 insertions(+), 237 deletions(-)
> 

> diff --git a/drivers/char/tpm/tpm_vtpm_proxy.c b/drivers/char/tpm/tpm_vtpm_proxy.c
> index 87a0ce47f201..a170f5ca7416 100644
> +++ b/drivers/char/tpm/tpm_vtpm_proxy.c
> @@ -678,20 +678,10 @@ static long vtpmx_fops_ioctl(struct file *f, unsigned int ioctl,
>  	}
>  }
>  
> -#ifdef CONFIG_COMPAT
> -static long vtpmx_fops_compat_ioctl(struct file *f, unsigned int ioctl,
> -					  unsigned long arg)
> -{
> -	return vtpmx_fops_ioctl(f, ioctl, (unsigned long)compat_ptr(arg));
> -}
> -#endif
> -
>  static const struct file_operations vtpmx_fops = {
>  	.owner = THIS_MODULE,
>  	.unlocked_ioctl = vtpmx_fops_ioctl,
> -#ifdef CONFIG_COMPAT
> -	.compat_ioctl = vtpmx_fops_compat_ioctl,
> -#endif
> +	.compat_ioctl = generic_compat_ioctl_ptrarg,
>  	.llseek = noop_llseek,
>  };

For vtpm:

Reviewed-by: Jason Gunthorpe <jgg@...lanox.com>

Arnd, would you consider including a patch as part of/after this
series to make compat_ioctl in drivers/infiniband/core/uverbs_main.c
use this as well?  Looks like a bug too?

Thanks,
Jason