linux-kernel - Re: is avoiding compat ioctls possible?

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Message-Id: <20091028.051631.212225494.davem@davemloft.net>
Date:	Wed, 28 Oct 2009 05:16:31 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	arndbergmann@...glemail.com
Cc:	airlied@...ux.ie, dri-devel@...ts.sourceforge.net,
	andi@...stfloor.org, linux-kernel@...r.kernel.org
Subject: Re: is avoiding compat ioctls possible?

From: Arnd Bergmann <arndbergmann@...glemail.com>
Date: Wed, 28 Oct 2009 13:13:32 +0100

> The ioctl argument actually needs a compat_ptr() conversion as well.
> For the s390 case, we can't do that in common code, because some
> ioctl methods put a 32 bit integer into the argument. Not sure if we
> want to fix that everywhere, the problem is very common and the
> impact is minimal.

What does s390 do with the 'arg' argument to sys_ioctl()?

That assumption that you can cast this to a pointer is everywhere.

If someone wants to fix this up, feel free to do an audit and go
over that seperately from my work :-)
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