What does HRESULT 0x80290200 (TBSIMP_E_BUFFER_TOO_SMALL) mean?

TBSIMP_E_BUFFER_TOO_SMALL

The TBS implementation needs a larger output or working buffer

TBSIMP_E_BUFFER_TOO_SMALL (0x80290200) is a size-contract result. The implementation knows the required data does not fit in the supplied buffer; this is not a TPM internal-memory error.

Evidence to capture

Record API, supplied buffer length, returned required size if available, structure/version, and whether the caller truncates a size_t/UINT value.

Focused correction

Allocate the documented required size and retry the same operation. Bound allocations using the API contract rather than repeatedly growing by an arbitrary constant.

Technical references

• Microsoft: About TPM Base Services.
• Microsoft: TBS return codes.
• Microsoft: Tbsi_Context_Create.
• Microsoft: Tbsip_Submit_Command.