linux-kernel - Re: [RELEASE] Lguest for 2.6.21

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Date:	Thu, 3 May 2007 11:57:49 +0800
From:	WANG Cong <xiyou.wangcong@...il.com>
To:	Rusty Russell <rusty@...tcorp.com.au>
Cc:	lkml - Kernel Mailing List <linux-kernel@...r.kernel.org>,
	virtualization <virtualization@...ts.linux-foundation.org>
Subject: Re: [RELEASE] Lguest for 2.6.21

On Thu, May 03, 2007 at 09:00:48AM +1000, Rusty Russell wrote:
>On Thu, 2007-05-03 at 03:33 +0800, WANG Cong wrote:
>> Hi Rusty!
>> 
>> I found you forgot to check the return value of copy_from_user, and
>> here is the fix for drivers/lguest/interrupts_and_traps.c.
>> 
>> Signed-off-by: WANG Cong <xiyou.wangcong@...il.com>
>
>Hi Wang!
>
>	Thanks for the patch.  This omission (in several places) was
>deliberate.  We can't really do anything sensible if the user unmapped
>the page.  I assume you saw a gcc warning from this code?

Yes. In fact, I got two warnings, another one is in drivers/lguest/hypercalls.c.

If I understand you correctly, you mean we can do nothing useful to fix it?

>
>	We could also use lgread() in these places which does this check and
>kills the guest if something goes wrong.  I'll check the benchmarks to
>make sure the (slight) extra overhead doesn't cause a regression...
>
>Thanks!
>Rusty.

I have sent a mail which described the errors I got when comipling Documentation/lguest/lguest.c. But it seems that you didn't receive it (it didn't appear in lkml.org neither!). It is that, I have already made my .config as you suggested, but I still can't compile Documentation/lguest/lguest.c, errors are:

lguest.c: In function 'add_to_bridge':
lguest.c:779: error: 'SIOCBRADDIF' undeclared (first use in this function)
lguest.c:779: error: (Each undeclared identifier is reported only once
lguest.c:779: error: for each function it appears in.)

Can you help me out?

Thanks!

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