so currently all cmsg headers are disabled through sendmsg and recvmsg operations through io_uring because of https://www.exploit-db.com/exploits/47779 i think it's time we start whitelisting the good guys though? GSO and GRO are hugely important for QUIC servers, and together offer a higher throughput gain than io_uring alone (rate of data transit considering), thus io_uring is the lesser performance choice for QUIC servers at the moment. RE http://vger.kernel.org/lpc_net2018_talks/willemdebruijn-lpc2018-udpgso-paper-DRAFT-1.pdf, GSO is about +~63% and GRO +~82%. this patch closes that loophole. Victor Stewart (1); net/socket.c: add __sys_whitelisted_cmsghdrs() net/socket.c | 15 ++++++++++++--- 1 file changed, 12 insertions(+), 3 deletions(-)
