linux-kernel - RE: [HPDD-discuss] [PATCH v1] staging: lustre: libcfs: add __user annotation in libcfs_ioctl

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Date:	Tue, 2 Jun 2015 17:29:13 +0000
From:	"Simmons, James A." <simmonsja@...l.gov>
To:	'Greg Kroah-Hartman' <gregkh@...uxfoundation.org>,
	David Decotigny <ddecotig@...il.com>
CC:	"devel@...verdev.osuosl.org" <devel@...verdev.osuosl.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"HPDD-discuss@...ts.01.org" <HPDD-discuss@...ts.01.org>,
	Amir Shehata <amir.shehata@...el.com>,
	"lustre-devel@...ts.lustre.org" <lustre-devel@...ts.lustre.org>
Subject: RE: [HPDD-discuss] [PATCH v1] staging: lustre: libcfs: add __user
 annotation in libcfs_ioctl_data


>>On Mon, Jun 01, 2015 at 12:21:30PM -0700, David Decotigny wrote:
>> Thanks for reviewing.
>> 
>> The 2 struct members were not marked as __user, which this patch does
>> here. This was causing warnings with copy from/to user (see commit
>> description). This patch also propagates the annotation to the couple
>> of functions that are using those members.
>
>Lustre's structures are a total mess of kernel and user pointers and
>trying to properly mark them as which they are supposed to be at what
>point in time is a very difficult task.  People keep trying and get it
>wrong, so I suggest just leaving this alone until the developers unwind
>the structure mess as that will be necessary for this code to get merged
>into the main part of the kernel.

Greg is right. The earlier patch set I sent out for the LNet headers
address this issue for the LNet layer. I also having patches coming that
fix libcfs ioctl handling as well. I see Shuey's patches made it in first so
I'm going to have to rebase. I will send out the new patch sets later today.
This will be v3 of the patch set.
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