linux-kernel - Re: [git pull] x86 updates

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

Message-ID: <20080205215454.GA20724@elte.hu>
Date:	Tue, 5 Feb 2008 22:54:54 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Sam Ravnborg <sam@...nborg.org>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>, linux-kernel@...r.kernel.org
Subject: Re: [git pull] x86 updates

* Sam Ravnborg <sam@...nborg.org> wrote:

> > btw., what's the practical consequence of getting these section 
> > flags wrong - for example writable data can end up in executable 
> > section accidentally and be marked readonly by RODATA? Or can 
> > anything more serious happen? (they cannot get into any of the 
> > discarded sections, we filter for them explicitly in the linker 
> > scripts)
>
> I have not investigated this. My attention were due to section 
> mismatch warnings pointing to section names I could not find in the 
> code. When I did an objdump of vmlinux the funny section names were 
> gone so I expected ld had recognized them and merged them somehow - 
> but I did not look closer as my focus was to get rid of them anyway.

ah, indeed. if we have the same section name but different attributes 
then i guess gas/ld resolves the conflict by auto-generating these 
.1/.2, etc. artificial sections. They dont show up in the vmlinux 
because they went through the linker scripts that merges them into a 
single output section. But modpost picks up those pre-merge names.

> I also did a quick skimming of info ld - but no luck.

Peter pointed me to "info gas", which has a "Sections and Relocation" 
chapter.

	Ingo
--
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/