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| author | Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@linux.intel.com> | 2026-02-11 03:17:10 +0300 |
|---|---|---|
| committer | Dan Williams <dan.j.williams@intel.com> | 2026-02-11 05:20:58 +0300 |
| commit | 5f486958bfae4e2059a26b947661a60efedd092d (patch) | |
| tree | 6995e2ec3d360a75ec17c2e0bb3e95cafb1bfe90 | |
| parent | 18f7fcd5e69a04df57b563360b88be72471d6b62 (diff) | |
| download | linux-5f486958bfae4e2059a26b947661a60efedd092d.tar.xz | |
configfs-tsm-report: Document size limits for outblob attributes
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>
| -rw-r--r-- | Documentation/ABI/testing/configfs-tsm-report | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/Documentation/ABI/testing/configfs-tsm-report b/Documentation/ABI/testing/configfs-tsm-report index 534408bc1408..ca3352cfd2f1 100644 --- a/Documentation/ABI/testing/configfs-tsm-report +++ b/Documentation/ABI/testing/configfs-tsm-report @@ -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 |