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| H A D | tee_svc.c | 452796429d5617dbcc87652da342c3f03fafdc89 Thu Oct 19 17:28:02 UTC 2023 Vincent Mailhol <mailhol.vincent@wanadoo.fr> core: tee_svc.c: allow to pass non-NULL memref of size 0
Allow TAs to pass non-NULL memref of size zero to other TAs by
changing the non-NULL pointer into a NULL one in such a case. GP TEE
Internal Core API does not forbid such memref parameter [1] whereas
the previous implementation generated a TEE_ERROR_BAD_PARAMETERS error
code when converting such memref buffer pointer into a physical memory
address.
This change is specifically needed to allow a TA to forward a REE
client memref for which GP TEE Client API explicitly allows such
non-NULL address zero sized memref [2]. It also makes the TA
implementation more flexible when dealing with its own memref.
[1] TEE Internal Core API Specification – Public Release v1.3.1,
§4.9.4 "Operation Parameters in the Internal Client API"
Table 4-15: "Interpretation of params[i] on Entry to Internal Client
API"
[2] TEE Client API Specification v1.0, §4.5.4 TEEC_RegisterSharedMemory,
paragraph "Implementers' Notes"
Signed-off-by: Vincent Mailhol <mailhol.vincent@wanadoo.fr>
Reviewed-by: Etienne Carriere <etienne.carriere@foss.st.com>
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