linux-kernel - Re: [PATCH] compat_ioctl: introduce generic_compat

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Message-Id: <200710201823.07791.arnd@arndb.de>
Date:	Sat, 20 Oct 2007 18:23:07 +0200
From:	Arnd Bergmann <arnd@...db.de>
To:	Christoph Hellwig <hch@...radead.org>
Cc:	Al Viro <viro@....linux.org.uk>,
	Philip Langdale <philipl@...rt.org>,
	Jiri Kosina <jkosina@...e.cz>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] compat_ioctl: introduce generic_compat_ioctl helper

On Saturday 20 October 2007, Christoph Hellwig wrote:
> At least for the unlocked_ioctl case this is not nessecary because
> the driver an simply set both the unlocked_ioctl and compat_ioctl
> handlers to the same function.  For the drivers not using unlocked_ioctl
> yet a function like this makes sense in theory, but I'd prefer to
> just switch them to ->unlocked_ioctl.
> 

There is still the problem with s390 compat_ptr() conversion, a driver
using the same handler for both may interpret a pointer with the high
bit set as out of range.

	Arnd <><
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