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TPM_20_E_COMMAND_SIZE
TPM_20_E_COMMAND_SIZE maps to TPM_RC_COMMAND_SIZE. The top-level commandSize value disagrees with the octets loaded by the hardware interface or is too small to hold a command header. The TPM rejects the request before normal command actions can begin.
Diagnostic steps
- Log the header tag,
commandSize, command code, and the exact byte count delivered to the TPM transport. - Check marshaling boundaries between the application, TSS, driver, and any proxy or simulator.
- Do not confuse this with
TPM_20_E_INSUFFICIENT, which denotes a shortage found while decoding a nested value.
TCG TPM 2.0 Part 2: TPM_RC_COMMAND_SIZE · TCG TPM 2.0 Part 3: command header layout
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