On Wed, May 31, 2023 at 01:45:24PM +0100, David Howells wrote: > It is necessary to allow MSG_SENDPAGE_* to be passed into ->sendmsg() to > allow sendmsg(MSG_SPLICE_PAGES) to replace ->sendpage(). Unblocking them > in the network protocol, however, allows these flags to be passed in by > userspace too[1]. > > Fix this by marking MSG_SENDPAGE_NOPOLICY, MSG_SENDPAGE_NOTLAST and > MSG_SENDPAGE_DECRYPTED as internal flags, which causes sendmsg() to object > if they are passed to sendmsg() by userspace. Network protocol ->sendmsg() > implementations can then allow them through. > > Note that it should be possible to remove MSG_SENDPAGE_NOTLAST once > sendpage is removed as a whole slew of pages will be passed in in one go by Hi David, on the off-chance that you need to respin for some other reason: s/in in/in/ > splice through sendmsg, with MSG_MORE being set if it has more data waiting > in the pipe. ...
