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Wed, 11 Mar 2026 04:29:30 +0000 From: Nicolai Stange To: Tyler Fanelli Cc: Oliver Steffen , Stefano Garzarella , coconut-svsm@lists.linux.dev Subject: [DISCUSSION] svsm: attestation + CocoonFs: Date: Wed, 11 Mar 2026 05:29:30 +0100 Message-ID: <873427gf9x.fsf@> User-Agent: Gnus/5.13 (Gnus v5.13) Precedence: bulk X-Mailing-List: coconut-svsm@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain X-Spam-Score: -1.59 X-Spam-Level: X-Spamd-Result: default: False [-1.59 / 50.00]; BAYES_HAM(-2.99)[99.97%]; INVALID_MSGID(1.70)[]; NEURAL_HAM_LONG(-1.00)[-1.000]; MID_RHS_NOT_FQDN(0.50)[]; SUBJECT_ENDS_SPACES(0.50)[]; NEURAL_HAM_SHORT(-0.19)[-0.969]; MIME_GOOD(-0.10)[text/plain]; RCVD_VIA_SMTP_AUTH(0.00)[]; RCVD_TLS_ALL(0.00)[]; ARC_NA(0.00)[]; TO_DN_SOME(0.00)[]; MIME_TRACE(0.00)[0:+]; FUZZY_RATELIMITED(0.00)[rspamd.com]; DKIM_SIGNED(0.00)[suse.de:s=susede2_rsa,suse.de:s=susede2_ed25519]; TO_MATCH_ENVRCPT_ALL(0.00)[]; FROM_HAS_DN(0.00)[]; RCPT_COUNT_THREE(0.00)[4]; FROM_EQ_ENVFROM(0.00)[]; RCVD_COUNT_TWO(0.00)[2]; DBL_BLOCKED_OPENRESOLVER(0.00)[imap1.dmz-prg2.suse.org:helo] X-Spam-Flag: NO Hi Tyler, I've been told in one of the svsm devel calls that a capability for storing some info in plaintext in CocoonFs would be helpful for your attestation efforts. Before I go and implement something, let me ask about the nature of that data. - What exactly are you planning to store there? - Presumably the filesystem salt from the image header, supposed to also serve as a filesystem ID ([1]), is not sufficient? - Is the data considered immutable over the lifetime of the FS? - Is it Ok if that data is not authenticated? Thanks! Nicolai [1] https://coconut-svsm.github.io/cocoon-tpm/cocoonfs/cocoonfs-format.html#image-header