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This will cause any syscall *not* in the allow list to cause SIGSYS and then we will exit from our signal handler (unless our signal handler uses a syscall that is not supported in which case we will crash, though a core dump will need to be checked) Requires explicitly calling this function where you want to actually *setup* the filters: FPlatformMisc::SetupSyscallFilters(); To use: -allowsyscallfilterfile=<path/to/allow_filter_file.txt> Example of file: read write open mprotect 2 4 0 1 There are only two supported rules for the file: <syscall_name> <syscall_name> <syscall_arg_number_zero_based_index> <value> <allow> <check bit only> #jira UE-169652 #rb Josh.Adams, Robert.Seiver, Calvin.Zheng #preflight 636d44e81c14fe450503f5cf [CL 23091532 by brandon schaefer in ue5-main branch]