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2 allowlist trap # 'allowlist' would normally mean kill a task doing any syscall which is not # allowlisted below. By appending 'trap' to the line, we will cause a SIGSYS # to be sent to the task instead. 'errno 0' would mean don't allow the system # call but immediately return 0. 'errno 22' would mean return EINVAL immediately. [x86_64] open close read write mount umount2 # Since we are listing system calls by name, we can also ask to have them resolved # for another arch, i.e. for 32/64-bit versions. [x86] open close read write mount umount2 # Do note that this policy does not allowlist enough system calls to allow a # system container to boot.