linux-kernel - Re: [PATCH v3 0/3] modversions: Fix CRC mangling under CONFIG

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Date:   Fri, 4 Nov 2016 09:55:44 +0000
From:   Ard Biesheuvel <ard.biesheuvel@...aro.org>
To:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        Michael Ellerman <mpe@...erman.id.au>, jeyu@...hat.com
Cc:     Will Deacon <will.deacon@....com>,
        Rusty Russell <rusty@...tcorp.com.au>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        "paulus@...ba.org" <paulus@...ba.org>,
        Ard Biesheuvel <ard.biesheuvel@...aro.org>
Subject: Re: [PATCH v3 0/3] modversions: Fix CRC mangling under CONFIG_RELOCATABLE=y

On 27 October 2016 at 17:27, Ard Biesheuvel <ard.biesheuvel@...aro.org> wrote:
> This series is a followup to the single patch 'modversions: treat symbol
> CRCs as 32 bit quantities on 64 bit archs', of which two versions have
> been sent out so far [0][1]
>
> As pointed out by Michael, GNU ld behaves a bit differently between arm64
> and PowerPC64, and where the former gets rid of all runtime relocations
> related to CRCs, the latter is not as easily convinced.
>
> Patch #1 fixes the issue where CRCs are corrupted by the runtime relocation
> routines for 32-bit PowerPC, for which the original fix was effectively
> reverted by commit 0e0ed6406e61 ("powerpc/modules: Module CRC relocation fix
> causes perf issues")
>
> Patch #2 adds handling of R_PPC64_ADDR32 relocations against the NULL .dynsym
> symbol entry to the PPC64 runtime relocation routines, so it is prepared to
> deal with CRCs being emitted as 32-bit quantities.
>
> Patch #3 is the original patch from the v1 and v2 submissions.
>
> Changes since v2:
> - added #1 and #2
> - updated #3 to deal with CRC entries being emitted from assembler
> - added Rusty's ack (#3)
>
> Branch can be found here:
> https://git.kernel.org/cgit/linux/kernel/git/ardb/linux.git/log/?h=kcrctab-reloc
>
> [0] http://marc.info/?l=linux-kernel&m=147652300207369&w=2
> [1] http://marc.info/?l=linux-kernel&m=147695629614409&w=2
>

Ping?

> Ard Biesheuvel (3):
>   powerpc/reloc32: fix corrupted modversion CRCs
>   powerpc/reloc64: add support for 32-bit CRC pseudo-symbols
>   modversions: treat symbol CRCs as 32 bit quantities on 64 bit archs
>
>  arch/powerpc/include/asm/module.h |  4 --
>  arch/powerpc/kernel/module_64.c   |  8 ----
>  arch/powerpc/kernel/reloc_32.S    | 36 +++++++++++++--
>  arch/powerpc/kernel/reloc_64.S    | 22 +++++++--
>  arch/powerpc/relocs_check.sh      |  3 +-
>  include/asm-generic/export.h      |  7 +--
>  include/linux/export.h            |  8 ++++
>  include/linux/module.h            | 14 +++---
>  kernel/module.c                   | 47 +++++++-------------
>  9 files changed, 85 insertions(+), 64 deletions(-)
>
> --
> 2.7.4
>