linux-kernel - Re: Behaviour of compat_msgsnd/compat

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Date:	Wed, 25 Oct 2006 13:49:32 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	suzuki@...ibm.com
Cc:	linux-kernel@...r.kernel.org
Subject: Re: Behaviour of compat_msgsnd/compat_msgrcv calls

From: Suzuki K P <suzuki@...ibm.com>
Date: Wed, 25 Oct 2006 11:59:05 -0700

> Is there any specific reason behind this ? Can't we just use the user 
> buffer directly instead of doing an additional copy_in_user ?
> ie,
> 	err = sys_msgrcv(first, uptr, second, msgtyp, third);

It's the cleanest way to deal with the difference in
"struct msgbuf" layout between native and compat userspace.

I guess we could make some common do_sys_msgrcv() function
that passed in a pointer to the "msgbuf" and the buffer
seperately.
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