CVE-2022-46152: OP-TEE Trusted OS vulnerable to Improper Validation of Array Index in the cleanup_shm_refs function

OP-TEE Trusted OS is the secure side implementation of OP-TEE project, a Trusted Execution Environment. Versions prior to 3.19.0, contain an Improper Validation of Array Index vulnerability. The function cleanupshmrefs() is called by both entryinvokecommand() and entryopensession(). The commands OPTEEMSGCMDOPENSESSION and OPTEEMSGCMDINVOKECOMMAND can be executed from the normal world via an OP-TEE SMC. This function is not validating the numparams argument, which is only limited to OPTEEMSGMAXNUMPARAMS (127) in the function getcmdbuffer(). Therefore, an attacker in the normal world can craft an SMC call that will cause out-of-bounds reading in cleanupshmrefs and potentially freeing of fake-objects in the function mobjput(). A normal-world attacker with permission to execute SMC instructions may exploit this flaw. Maintainers believe this problem permits local privilege escalation from the normal world to the secure world. Version 3.19.0 contains a fix for this issue. There are no known workarounds.