Backport a few patches to stable-0.9#579
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Limit the variable indicating to the caller how many bytes were returned in a TPM response to the size returned from TPM2_GetBufferSize(). This then reflects the buffer size that was negotiated with the TPMLIB_SetBufferSize() call and for which the recipient of the buffer should have enough space for. Signed-off-by: Stefan Berger <stefanb@linux.ibm.com>
The minimum buffer size was set to MAX_CONTEXT_SIZE + 128, which is fine if the assumption that the actual biggest command or response buffer is created by TPM2_ContextLoad/Save commands holds. If the assumption was not holding, then the choice of the minimum buffer size would truncate response sizes. Adjust this size to the sizeof(TPMS_CONTEXT), which is 80 bytes bigger than MAX_CONTEXT_SIZE but still related to TPM2_ContextLoad/Save commands. Still add a generous additional 128 bytes to it. Add a comment about the maximum size and the sizes used by TIS and CRB. Signed-off-by: Stefan Berger <stefanb@linux.ibm.com>
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