linux-kernel - Re: 2.6.33-rc1 build failure: copy_from_user() buffer size is not provably correct

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Message-Id: <20091222091642.1416.A69D9226@jp.fujitsu.com>
Date:	Tue, 22 Dec 2009 09:19:09 +0900 (JST)
From:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	kosaki.motohiro@...fujitsu.com, Ingo Molnar <mingo@...e.hu>,
	Arjan van de Ven <arjan@...radead.org>,
	Ritesh Raj Sarraf <rrs@...earchut.com>,
	linux-kernel@...r.kernel.org, Thomas Gleixner <tglx@...utronix.de>
Subject: Re: 2.6.33-rc1 build failure: copy_from_user() buffer size is not provably correct

> On 12/21/2009 01:13 AM, Ingo Molnar wrote:
> > 
> > * KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com> wrote:
> > 
> >>>                  from mm/migrate.c:15:
> >>> In function ???copy_from_user???,
> >>>     inlined from ???do_pages_stat??? at mm/migrate.c:1009:
> >>> /tmp/all-yes-config/2.6.33-rc1/arch/x86/include/asm/uaccess_32.h:213: error: 
> >>> call to ???copy_from_user_overflow??? declared with attribute error: 
> >>> copy_from_user() buffer size is not provably correct
> >>
> >> afaik, ingo already queued this fix.
> >> please wait (very) few days.
> >>
> >> thanks.
> > 
> > hm, the one mm/migrate.c fix we had is already in -rc1:
> > 
> >  b9255850: mm: Adjust do_pages_stat() so gcc can see copy_from_user() is safe
> > 
> > I've Cc:-ed more folks.
> > 
> 
> That *is* the error report that he is describing.  What version of gcc
> is he using?  It might be dumber than the one I have.

I was also successed build.

my environment is here:

	2.6.33-rc1
	CONFIG_DEBUG_STRICT_USER_COPY_CHECKS=y
	gcc version 4.4.2 20091027 (Red Hat 4.4.2-7) (GCC)

I'm amazing (?_?)



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