On 1/16/20 4:13 PM, Stefan Metzmacher wrote: > Hi Jens, > > In the "io_uring: add support for IORING_OP_IOCTL" thread I wrote this: > >> I could use also use a generic way for an async fd-based syscall. >> I thought about using sendmsg() with special CMSG_ elements, but >> currently it's not possible with IORING_OP_SENDMSG to do an async >> io_kiocb based completion, using msg_iocb. > > I just noticed that __sys_sendmsg_sock doesn't allow > msg->msg_control || msg->msg_controllen. > > Why is that the case? > I could use that in several places for my smbdirect driver. > > Optionally turning on msg_iocb usage would also be great, > I'd use that in combination with MSG_OOB and CMSG_ > and this OOB message is not ordered like the typical > sendmsg stream socket flow. > > Do you think we can add support for this usecase? It was done because of the CVE related to io_uring, but we really don't need to since we have creds setup properly now. So it could be allowed again. -- Jens Axboe
