linux-kernel - Re: [PATCH v5 0/6] KEXEC_SIG with appended signature

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Message-ID: <87pmnwlkaa.fsf@mpe.ellerman.id.au>
Date:   Wed, 09 Feb 2022 15:46:05 +1100
From:   Michael Ellerman <mpe@...erman.id.au>
To:     Luis Chamberlain <mcgrof@...nel.org>,
        Michal Suchanek <msuchanek@...e.de>,
        David Howells <dhowells@...hat.com>,
        Aaron Tomlin <atomlin@...hat.com>
Cc:     keyrings@...r.kernel.org, linux-crypto@...r.kernel.org,
        linux-integrity@...r.kernel.org, kexec@...ts.infradead.org,
        Philipp Rudo <prudo@...hat.com>,
        Mimi Zohar <zohar@...ux.ibm.com>,
        Nayna <nayna@...ux.vnet.ibm.com>, Rob Herring <robh@...nel.org>,
        linux-s390@...r.kernel.org, Vasily Gorbik <gor@...ux.ibm.com>,
        Lakshmi Ramasubramanian <nramas@...ux.microsoft.com>,
        Heiko Carstens <hca@...ux.ibm.com>,
        Jessica Yu <jeyu@...nel.org>, linux-kernel@...r.kernel.org,
        David Howells <dhowells@...hat.com>,
        Christian Borntraeger <borntraeger@...ibm.com>,
        Paul Mackerras <paulus@...ba.org>,
        Hari Bathini <hbathini@...ux.ibm.com>,
        Alexander Gordeev <agordeev@...ux.ibm.com>,
        linuxppc-dev@...ts.ozlabs.org,
        Frank van der Linden <fllinden@...zon.com>,
        Thiago Jung Bauermann <bauerman@...ux.ibm.com>,
        Daniel Axtens <dja@...ens.net>, buendgen@...ibm.com,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Christian Borntraeger <borntraeger@...ux.ibm.com>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        "David S. Miller" <davem@...emloft.net>,
        Dmitry Kasatkin <dmitry.kasatkin@...il.com>,
        James Morris <jmorris@...ei.org>,
        "Serge E. Hallyn" <serge@...lyn.com>,
        Sven Schnelle <svens@...ux.ibm.com>,
        Baoquan He <bhe@...hat.com>,
        linux-security-module@...r.kernel.org
Subject: Re: [PATCH v5 0/6] KEXEC_SIG with appended signature

Luis Chamberlain <mcgrof@...nel.org> writes:
> On Tue, Jan 11, 2022 at 12:37:42PM +0100, Michal Suchanek wrote:
>> Hello,
>> 
>> This is a refresh of the KEXEC_SIG series.
>> 
>> This adds KEXEC_SIG support on powerpc and deduplicates the code dealing
>> with appended signatures in the kernel.
>> 
>> powerpc supports IMA_KEXEC but that's an exception rather than the norm.
>> On the other hand, KEXEC_SIG is portable across platforms.
>> 
>> For distributions to have uniform security features across platforms one
>> option should be used on all platforms.
>> 
>> Thanks
>> 
>> Michal
>> 
>> Previous revision: https://lore.kernel.org/linuxppc-dev/cover.1637862358.git.msuchanek@suse.de/
>> Patched kernel tree: https://github.com/hramrach/kernel/tree/kexec_sig
>> 
>> Michal Suchanek (6):
>>   s390/kexec_file: Don't opencode appended signature check.
>>   powerpc/kexec_file: Add KEXEC_SIG support.
>>   kexec_file: Don't opencode appended signature verification.
>>   module: strip the signature marker in the verification function.
>>   module: Use key_being_used_for for log messages in
>>     verify_appended_signature
>>   module: Move duplicate mod_check_sig users code to mod_parse_sig
>
> What tree should this go through? I'd prefer if over through modules
> tree as it can give a chance for Aaron Tomlin to work with this for his
> code refactoring of kernel/module*.c to kernel/module/

Yeah that's fine by me, the arch changes are pretty minimal and unlikely
to conflict much.

cheers