linux-kernel - Re: [PATCH v3 07/12] ppc64/kexec_file: add support to relocate purgatory

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: <87365rcdor.fsf@morokweng.localdomain>
Date:   Thu, 16 Jul 2020 19:12:04 -0300
From:   Thiago Jung Bauermann <bauerman@...ux.ibm.com>
To:     Hari Bathini <hbathini@...ux.ibm.com>
Cc:     kernel test robot <lkp@...el.com>, Pingfan Liu <piliu@...hat.com>,
        Nayna Jain <nayna@...ux.ibm.com>,
        Kexec-ml <kexec@...ts.infradead.org>,
        Mahesh J Salgaonkar <mahesh@...ux.ibm.com>,
        Mimi Zohar <zohar@...ux.ibm.com>,
        lkml <linux-kernel@...r.kernel.org>,
        linuxppc-dev <linuxppc-dev@...abs.org>,
        Sourabh Jain <sourabhjain@...ux.ibm.com>,
        Petr Tesarik <ptesarik@...e.cz>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Dave Young <dyoung@...hat.com>,
        Vivek Goyal <vgoyal@...hat.com>,
        Eric Biederman <ebiederm@...ssion.com>
Subject: Re: [PATCH v3 07/12] ppc64/kexec_file: add support to relocate purgatory


Hari Bathini <hbathini@...ux.ibm.com> writes:

> On 16/07/20 5:50 am, Thiago Jung Bauermann wrote:
>> 
>> Hari Bathini <hbathini@...ux.ibm.com> writes:
>> 
>>> So, add support to relocate purgatory in kexec_file_load system call
>>> by setting up TOC pointer and applying RELA relocations as needed.
>> 
>> If we do want to use a C purgatory, Michael Ellerman had suggested
>> building it as a Position Independent Executable, which greatly reduces
>> the number and types of relocations that are needed. See patches 4 and 9
>> here:
>> 
>> https://lore.kernel.org/linuxppc-dev/1478748449-3894-1-git-send-email-bauerman@linux.vnet.ibm.com/
>> 
>> In the series above I hadn't converted x86 to PIE. If I had done that,
>> possibly Dave Young's opinion would have been different. :-)
>> 
>> If that's still not desirable, he suggested in that discussion lifting
>> some code from x86 to generic code, which I implemented and would
>> simplify this patch as well:
>> 
>> https://lore.kernel.org/linuxppc-dev/5009580.5GxAkTrMYA@morokweng/
>> 
>
> Agreed. But I prefer to work on PIE and/or moving common relocation_add code
> for x86 & s390 to generic code later when I try to build on these purgatory
> changes. So, a separate series later to rework purgatory with the things you
> mentioned above sounds ok?

Sounds ok to me. Let's see what the maintainers think, then.

-- 
Thiago Jung Bauermann
IBM Linux Technology Center