linux-kernel - Re: modpost warning question

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [day] [month] [year] [list]

Message-ID: <20070725114543.GC25580@uranus.ravnborg.org>
Date:	Wed, 25 Jul 2007 13:45:43 +0200
From:	Sam Ravnborg <sam@...nborg.org>
To:	chengong <g.chen@...escale.com>
Cc:	Kumar Gala <galak@...nel.crashing.org>, linuxppc-dev@...abs.org,
	linux-kernel@...r.kernel.org, Jeff Garzik <jeff@...zik.org>,
	netdev@...r.kernel.org
Subject: Re: modpost warning question

On Wed, Jul 25, 2007 at 06:08:03PM +0800, chengong wrote:
> On Wed, 2007-07-25 at 09:27 +0200, Sam Ravnborg wrote:
> > On Wed, Jul 25, 2007 at 02:14:12AM -0500, Kumar Gala wrote:
> > > I'm seeing the following warning:
> > > 
> > > WARNING: vmlinux.o(.init.text+0x1acdc): Section mismatch: reference to
> > > .exit.text:gfar_mdio_exit (between 'gfar_init' and 'gfar_mdio_init')
> > > 
> > > I don't understand why its not ok to access .exit.text from .init.text
> > 
> > Several architectures discards .exit.text in the final linker
> > script (arch/$(ARCH)/kernel/vmlinux.lds.S
> > 
> > So any references to .exit.text will when a module is build-in result
> > in a linker error because ld will flag it as an error when we reference
> > a symbol in a discarded section.
> But why? Just make kernel size smaller?
Yes - that the whole goal of init/exit sections.

> > 
> > For the popular architectures (i386,x86_64) we discard .exit.text at
> > runtime so here we do not see the error from ld (sadly).
> >From which version? On my machine I have seen the same problem when
> building i386 target with the version 2.6.21.
modpost has started to warn about it. I assume you did not see link errors.

	Sam
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/