Re: is avoiding compat ioctls possible?

David Miller
2009-10-28T05:29:32Z

From: Andi Kleen <andi@firstfloor.org>
Date: Wed, 28 Oct 2009 05:36:11 +0100

> On Tue, Oct 27, 2009 at 08:37:09PM -0700, David Miller wrote:
>> On sparc64, in order to make debugging easier, we trap any time
>> the kernel does a userspace access to a compat task and any
>> of the upper 32-bits are non-zero.
>
> Interesting. That definitely means Dave needs a special path.

I wouldn't call it special, the rule is that any userland pointer
has to either go through a syscall argument register or one
of the compat_*() accessor routines :-)