linux-kernel - Re: [digsig:dmi 20/35] WARNING: security/integrity/built-in.o(.text+0x1d8): Section mismatch in reference from the function integrity_inode_free() to the variable .init.data:ima_use

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Message-ID: <20121106115716.GA21889@localhost>
Date:	Tue, 6 Nov 2012 19:57:16 +0800
From:	Fengguang Wu <fengguang.wu@...el.com>
To:	"Kasatkin, Dmitry" <dmitry.kasatkin@...el.com>
Cc:	Sam Ravnborg <sam@...nborg.org>,
	Mimi Zohar <zohar@...ux.vnet.ibm.com>,
	linux-security-module@...r.kernel.org,
	linux-kbuild <linux-kbuild@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [digsig:dmi 20/35] WARNING:
 security/integrity/built-in.o(.text+0x1d8): Section mismatch in reference
 from the function integrity_inode_free() to the variable
 .init.data:ima_use_tcb

Perhaps we should CC more people..

On Tue, Nov 06, 2012 at 01:47:18PM +0200, Kasatkin, Dmitry wrote:
> On Tue, Nov 6, 2012 at 1:41 PM, Fengguang Wu <fengguang.wu@...el.com> wrote:
> > On Tue, Nov 06, 2012 at 01:16:16PM +0200, Kasatkin, Dmitry wrote:
> >> Hi,
> >>
> >> I do not see that integrity_inode_free() uses ima_use_tcb.
> >>
> >> I think it is false positive.
> >
> > Interestingly, when trying to reproduce the problem, I got this
> > slightly different message:

Now after make clean, I get both the warnings on ima_use_tcb and
chosen_lsm.

> > WARNING: security/built-in.o(.text+0x2b68c): Section mismatch in reference from the function integrity_inode_free() to the variable .init.d
> > ata:chosen_lsm
> > The function integrity_inode_free() references
> > the variable __initdata chosen_lsm.
> > This is often because integrity_inode_free lacks a __initdata
> > annotation or the annotation of chosen_lsm is wrong.
> >
> 
> Hello,
> 
> chosen_lsm has nothing to do with integrity subsystem, though
> integrity_inode_free() is called from security_inode_free(),
> which is part of security subsystem files which uses chosen_lsm...
> 
> That is very strange.
> 
> - Dmitry
> 
> 
> > Thanks,
> > Fengguang
> >
> >> On Wed, Oct 31, 2012 at 5:11 PM, kbuild test robot
> >> <fengguang.wu@...el.com> wrote:
> >> > tree:   git://git.kernel.org/pub/scm/linux/kernel/git/kasatkin/linux-digsig.git dmi
> >> > head:   2309bb884f94d84ecb1a6a176d3e8199de7d6dad
> >> > commit: 13ba29dcf6f0021a14a04f6f3a4560a399c02b34 [20/35] integrity: create and inititialize a keyring with builtin public key
> >> > config: make ARCH=xtensa allyesconfig
> >> >
> >> > All warnings:
> >> >
> >> > WARNING: security/integrity/built-in.o(.text+0x1d8): Section mismatch in reference from the function integrity_inode_free() to the variable .init.data:ima_use_tcb
> >> > The function integrity_inode_free() references
> >> > the variable __initdata ima_use_tcb.
> >> > This is often because integrity_inode_free lacks a __initdata
> >> > annotation or the annotation of ima_use_tcb is wrong.
> >> >
> >> > ---
> >> > 0-DAY kernel build testing backend         Open Source Technology Center
> >> > Fengguang Wu, Yuanhan Liu                              Intel Corporation
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