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

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Date:   Wed, 16 Nov 2016 20:29:13 +0000
From:   Ard Biesheuvel <ard.biesheuvel@...aro.org>
To:     Uwe Kleine-König 
        <u.kleine-koenig@...gutronix.de>
Cc:     "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,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Rusty Russell <rusty@...tcorp.com.au>,
        Will Deacon <will.deacon@....com>,
        "paulus@...ba.org" <paulus@...ba.org>,
        Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH v3 0/3] modversions: Fix CRC mangling under CONFIG_RELOCATABLE=y

On 16 November 2016 at 19:23, Uwe Kleine-König
<u.kleine-koenig@...gutronix.de> wrote:
> On Thu, Oct 27, 2016 at 05:27:08PM +0100, Ard Biesheuvel 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.
>
> Is this related to me seeing
>
> [    2.111424] mvneta: module verification failed: signature and/or required key missing - tainting kernel
> [    2.126061] scsi_mod: no symbol version for _clear_bit
> [    2.131257] scsi_mod: Unknown symbol _clear_bit (err -22)
> [    2.138093] mvneta: no symbol version for _clear_bit
> [    2.143117] mvneta: Unknown symbol _clear_bit (err -22)
> [    2.144135] mvmdio: no symbol version for __gnu_mcount_nc
> [    2.144138] mvmdio: Unknown symbol __gnu_mcount_nc (err -22)
> ...
>
> ? If so, this would be great to mention it in the commit log to make
> people searching for this issue actually find this patch set.
>

No, I don't think it is. My guess would be that it is caused by

https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=4dd1837d75