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Linux kernel hacker and maintainer etc.

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jarkko

Jarkko Sakkinen

Reply to @vbabka
@vbabka Yeah, exactly :D Feels like going to a war zone. But they pay the trip, I have a small demo and my old friend Sonja lives Prague so I don't have to brainwash myself for the whole weekend.
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jarkko

Jarkko Sakkinen

Reply to @vbabka
@vbabka Yeah, I mean that instruction is a bit ambiguous on the key type :-) I'll just try it for fun and non-profit...
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jarkko

Jarkko Sakkinen

Reply to @vbabka
@vbabka hmm... so cert key is not changing. i need to try if i can just use another auth key rooted to that cert key :-)
that is ecdsa key is also old but just not atm the one in yubikey.
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jarkko

Jarkko Sakkinen

Booked flights to Prague, will go there from 30-May to 03-Jun in order to attend and present at Ethprague conference.
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jarkko

Jarkko Sakkinen

Reply to @jarkko
Actually even TCG_TPM is not in x86 defconfig but this would mean two switches just to get the basic environment ongoing if it was not default I think this sweet spot solution in this case.
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jarkko

Jarkko Sakkinen

Edited 1 year ago
I think this is quite good middle ways with enabling HMAC by default: https://lkml.org/lkml/2024/5/21/583

For longer story:
https://lore.kernel.org/linux-integrity/D1FCAPJSYLTS.R9VC1CXDCIHH@kernel.org/

#linux #kernel #tpm #hmac
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jarkko

Jarkko Sakkinen

I’d like to switch A-subkey from RSA to ECDSA one. Do I just send the public key via email to helpdesk@kernel.org?

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jarkko

Jarkko Sakkinen

Reply to @Tutanota@mastodon.social
Edited 1 year ago
@Tutanota My email provider is non-profit organization #Kapsi from Oulu, Finland. It is full shell access (SSH) with 50GB of backed up space and 500GB of dump storage (not backed up). And the servers are within the homeland borders :-) It is essentially a full no compromises account. There's also opt-in services like MySQL (not using tho). The whole package costs me 40 EUR per year. Cannot get over how great it is and has been :-) Oulu is the town where IRC protocol was invented by Jarkko Oikarinen in 1988 and the first IRC server ever turned on.
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jarkko

Jarkko Sakkinen

Edited 1 year ago

Took six review rounds to get it but learned something pretty basic about #BuildRoot: pure dependencies should not have Config.ih{.host} at all. In my case the main asset is swtpm, which depends on libtpms. Only swtpm has Config.in.host now and libtpms has only libtpms.{mk,hash}.

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jarkko

Jarkko Sakkinen

Time test packaging Rust program for BuildRoot. Need a full system build for testing a pam module in dev (written in rust).
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jarkko

Jarkko Sakkinen

Edited 1 year ago

Any ways to trace more like bpftrace way between core_initcall and before init starts? Like somehow e.g. compiling eBPF blobs to vmlinux or similar.

I use bootconfig and boot-time tracing stuff and it is nice but barely shadow of what you can do with e.g. bpftrace.

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jarkko

Jarkko Sakkinen

I'm actually sort of wondering this #Gitlab CI thing. I mean it is quite easy to run kselftest even today without any patches to mainline kernel. What's the value added?

#linux #kernel
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jarkko

Jarkko Sakkinen

Made my first post to rust-for-linux list given a pratical need and use. 

I'll make a PoC with asn1rs by simply deleting everything not needed and hammering the rest 🤷 And first in user space and maybe someone with more kernel rust experience can help me out to fit it there.

https://lore.kernel.org/rust-for-linux/D1F44P3VLTBN.30LUQ60X5J3DN@kernel.org/T/#u
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jarkko

Jarkko Sakkinen

Reply to @vbabka
@vbabka ah OK I put it here https://social.kernel.org/notice/Ai6Kv0bU391JqnJpvk
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jarkko

Jarkko Sakkinen

Reply to @jarkko
The use cases are quite trivial really. Want a server to sign x509 without exposing the private key? Yeah, that's the whole point here. Verification can be done with software, and is done with software. Signing and decryption are done with the private key inside TPM2.

Higher goal is to implement this x509 spec by David Woodhouse but the above is the basic gist here:
https://datatracker.ietf.org/doc/draft-woodhouse-cert-best-practice/
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jarkko

Jarkko Sakkinen

v2 of #TPM2 asymmetric keys: https://lore.kernel.org/linux-integrity/20240521031645.17008-1-jarkko@kernel.org/

Crypto stuff is so easy to break especially in format conversions so decided to save low-hanging fruit clean up for a separate version. From this version forward, I'll promise to stop spamming :-)

#linux #kernel
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jarkko

Jarkko Sakkinen

Reply to @securepaul@fosstodon.org
@securepaul Yeah, not too stressed about that :-) I think I will survive...
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jarkko

Jarkko Sakkinen

Reply to @jarkko
@securepaul Good time to activate a bit as I'm on a job seek too. I don't know how to build a great image of myself but I do know how to write code so I guess this is a good approach to move forward ;-)
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jarkko

Jarkko Sakkinen

Reply to @securepaul@fosstodon.org
@securepaul "How did TPM2 began its journey in Linux kernel and where it is heading? Why is TPM2 important for Linux? TPM2 is more like a protocol or contract for hardware cryptography than just a chip. And it still has a legit place despite Trusted Execution Environments (TEEs) and confidential computing up-rise."
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jarkko

Jarkko Sakkinen

Reply to @securepaul@fosstodon.org
@securepaul I put something to ksummit https://lpc.events/event/18/abstracts/1801/ (first time for a loooong time).

and made a new key type :-). https://lore.kernel.org/linux-integrity/D1EWI92F6AIH.3CFED3IMI10ZA@kernel.org/T/#t
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