Hi Soheil, > Thank you for CCing us. > > The reason for PROTO_CMSG_DATA_ONLY is explained in the paragraph > above in the commit message. PROTO_CMSG_DATA_ONLY is basically to > allow-list a protocol that is guaranteed not to have the privilege > escalation in https://crbug.com/project-zero/1975. TCP doesn't have > that issue, and I believe UDP doesn't have that issue either (but > please audit and confirm that with +Jann Horn). > > If you couldn't find any non-data CMSGs for UDP, you should just add > PROTO_CMSG_DATA_ONLY to inet dgram sockets instead of introducing > __sys_whitelisted_cmsghdrs as Stefan mentioned. Was there a specific reason why you only added the PROTO_CMSG_DATA_ONLY check in __sys_recvmsg_sock(), but not in __sys_sendmsg_sock()? metze
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