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configfs-tsm-report: Document size limits for outblob attributes

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The configfs-tsm-report interface can fail with -EFBIG when the
attestation report generated by a TSM provider exceeds internal
maximums (TSM_REPORT_OUTBLOB_MAX). However, this error condition and
its handling are not currently documented in the ABI.

Userspace tools need to understand how to interpret various error
conditions when reading attestation reports.

Document that reads fail with -EFBIG when reports exceed size limits,
with guidance on how to resolve them.

Reviewed-by: Fang Peter <peter.fang@intel.com>
Signed-off-by: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@linux.intel.com>
Link: https://patch.msgid.link/20260211001712.1531955-2-sathyanarayanan.kuppuswamy@linux.intel.com
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
This commit is contained in:
Kuppuswamy Sathyanarayanan 2026-02-10 16:17:10 -08:00 • committed by Dan Williams
parent 18f7fcd5e6
commit 5f486958bf
1 changed files with 12 additions and 0 deletions
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12
Documentation/ABI/testing/configfs-tsm-report
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@ -17,6 +17,12 @@ Description:
where the implementation is conveyed via the @provider
attribute.
This interface fails reads and sets errno to EFBIG when the
report generated by @provider exceeds the configfs-tsm-report
internal maximums. Contact the platform provider for the
compatible security module, driver, and attestation library
combination.
What: /sys/kernel/config/tsm/report/$name/auxblob
Date: October, 2023
KernelVersion: v6.7
@ -31,6 +37,9 @@ Description:
Standardization v2.03 Section 4.1.8.1 MSG_REPORT_REQ.
https://www.amd.com/content/dam/amd/en/documents/epyc-technical-docs/specifications/56421.pdf
See "EFBIG" comment in the @outblob description for potential
error conditions.
What: /sys/kernel/config/tsm/report/$name/manifestblob
Date: January, 2024
KernelVersion: v6.10
@ -43,6 +52,9 @@ Description:
See 'service_provider' for information on the format of the
manifest blob.
See "EFBIG" comment in the @outblob description for potential
error conditions.
What: /sys/kernel/config/tsm/report/$name/provider
Date: September, 2023
KernelVersion: v6.7