From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1759717AbXHPU5H (ORCPT ); Thu, 16 Aug 2007 16:57:07 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1756621AbXHPU4z (ORCPT ); Thu, 16 Aug 2007 16:56:55 -0400 Received: from ivoti.hst.terra.com.br ([200.176.10.212]:55359 "EHLO ivoti.terra.com.br" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756593AbXHPU4y convert rfc822-to-8bit (ORCPT ); Thu, 16 Aug 2007 16:56:54 -0400 X-Greylist: delayed 3897 seconds by postgrey-1.27 at vger.kernel.org; Thu, 16 Aug 2007 16:56:54 EDT X-Terra-Karma: 0% X-Terra-Hash: 0843979c352a5f5634ba8f75d6d72d2f Date: Thu, 16 Aug 2007 16:48:43 -0300 Message-Id: Subject: Re:[Spam] Re: [PATCH] UML - Add a .note.SuSE section MIME-Version: 1.0 X-Sensitivity: 3 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7BIT From: "Alberto Pires de Oliveira Neto" To: "jdike" Cc: "arjan" , "akpm" , "stable" , "linux-kernel" , "user-mode-linux-devel" , "giedrius" X-XaM3-API-Version: 4.1 (B124) X-SenderIP: 200.192.225.10 Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Hi Jeff, I'm really sorry, but I forget to mention, that I had the same problems on a RedHat RH4 (x86_64) too. > On Thu, Aug 16, 2007 at 09:30:56AM -0700, Arjan van de Ven wrote: > > this sounds like something really stupid and bad... why would the kernel > > need to have a per-distro note section??? > > On Thu, Aug 16, 2007 at 09:39:06AM -0700, Chris Wright wrote: > > Huh!? Why do we need a SuSE section? > > On Thu, Aug 16, 2007 at 09:54:55AM -0700, Greg KH wrote: > > I agree, what did we mess up in the SuSE kernel to require such a hack? > > Beats the crap out of me. > > Drop this patch - it looks like it might just be papering over > symptoms rather than fixing the real problem - see below. > > What I do know is that current UML doesn't run when built on a SuSE > host, the UML commit which caused it to break is > c35e584c087381aaa5f1ed40a28b978535c18fb2 > > http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commitdiff;h=c35e584c087381aaa5f1ed40a28b978535c18fb2;hp=a5bd1786fb30abe663b904f6d79bba413e9ba883 > > and the difference between a working UML binary and a broken one is > this: > > + 1 .note.ABI-tag 00000020 0000000060000254 0000000060000254 00000254 2**2 > + CONTENTS, ALLOC, LOAD, READONLY, DATA > + 2 .note.SuSE 00000018 0000000060000274 0000000060000274 00000274 2**2 > + CONTENTS, ALLOC, LOAD, READONLY, DATA > > and the .note.SuSE section makes the difference. > > Looking into it a bit further, the contents of the section are: > > objdump --section=.note.SuSE -s uml8796-linux-good > > uml8796-linux-good: file format elf64-x86-64 > > Contents of section .note.SuSE: > 60000274 05000000 04000000 53755345 53755345 ........SuSESuSE > 60000284 00000000 01000a02 ........ > > which seems kind of pointless, but also harmless. > > The crash is in this section: > > __uml_setup_start = .; > .uml.setup.init : { *(.uml.setup.init) } > __uml_setup_end = .; > > with &__uml_setup_start being 8 bytes before the start of the first > 16-byte structure in .uml.setup.init, so the structures are misaligned > wrt the start symbol. > > I don't see any connection between the presence of a section at the > start of the binary and this misalignment, so the patch is probably wrong. > > Jeff > > -- > Work email - jdike at linux dot intel dot com > > E-mail classificado pelo Identificador de Spam Inteligente Terra. > Para alterar a categoria classificada, visite > http://mail.terra.com.br/cgi-bin/imail.cgi?+_u=apon1&_l=1,1187292509.393134.20591.domoni.hst.terra.com.br,4040,20031127114101,20031127114101 > > Esta mensagem foi verificada pelo E-mail Protegido Terra. > Scan engine: McAfee VirusScan / Atualizado em 16/08/2007 / Vers?o: 5.1.00/5099 > Proteja o seu e-mail Terra: http://mail.terra.com.br/ >