From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To: Arnd Bergmann <arnd@arndb.de>
Cc: linux-fbdev@vger.kernel.org, linux-iio@vger.kernel.org,
linux-pci@vger.kernel.org, linux-remoteproc@vger.kernel.org,
linux-nvme@lists.infradead.org,
platform-driver-x86@vger.kernel.org, sparclinux@vger.kernel.org,
devel@driverdev.osuosl.org, linux-scsi@vger.kernel.org,
linux-nvdimm@lists.01.org, linux-rdma@vger.kernel.org,
qat-linux@intel.com, amd-gfx@lists.freedesktop.org,
linux-input@vger.kernel.org, linux-media@vger.kernel.org,
linaro-mm-sig@lists.linaro.org, dri-devel@lists.freedesktop.org,
ceph-devel@vger.kernel.org, netdev@vger.kernel.org,
linux-usb@vger.kernel.org, linux-wireless@vger.kernel.org,
linux-kernel@vger.kernel.org, linux-crypto@vger.kernel.org,
linux-fsdevel@vger.kernel.org, linuxppc-dev@lists.ozlabs.org,
"David S. Miller" <davem@davemloft.net>,
linux-btrfs@vger.kernel.org, viro@zeniv.linux.org.uk
Subject: Re: [PATCH v2 05/17] compat_ioctl: move more drivers to generic_compat_ioctl_ptrarg
Date: Wed, 12 Sep 2018 20:13:30 +0200 [thread overview]
Message-ID: <20180912181330.GC15031@kroah.com> (raw)
In-Reply-To: <20180912151134.436719-1-arnd@arndb.de>
On Wed, Sep 12, 2018 at 05:08:52PM +0200, Arnd Bergmann 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 ever 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.
>
> Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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next prev parent reply other threads:[~2018-09-12 18:13 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20180912150142.157913-1-arnd@arndb.de>
2018-09-12 15:08 ` [PATCH v2 05/17] compat_ioctl: move more drivers to generic_compat_ioctl_ptrarg Arnd Bergmann
2018-09-12 15:56 ` Jason Gunthorpe
2018-09-12 15:58 ` Daniel Vetter
2018-09-12 16:01 ` Mauro Carvalho Chehab
2018-09-12 18:13 ` Greg Kroah-Hartman [this message]
2018-09-14 14:23 ` David Sterba
2018-09-14 20:35 ` Darren Hart
2018-09-14 20:57 ` Al Viro
2018-09-18 17:51 ` Darren Hart
2018-09-18 17:59 ` Jason Gunthorpe
2018-09-24 20:18 ` Arnd Bergmann
2018-09-24 20:35 ` Jason Gunthorpe
2018-09-24 21:17 ` Arnd Bergmann
2018-09-17 9:33 ` Jonathan Cameron
2018-10-06 7:05 ` Bjorn Andersson
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