[Drbd-dev] [PATCH 27/33] sctp: export sctp_setsockopt_bindx
dhowells at redhat.com
Sat Jun 13 12:11:15 CEST 2020
Christoph Hellwig <hch at lst.de> wrote:
> > The advantage on using kernel_setsockopt here is that sctp module will
> > only be loaded if dlm actually creates a SCTP socket. With this
> > change, sctp will be loaded on setups that may not be actually using
> > it. It's a quite big module and might expose the system.
> True. Not that the intent is to kill kernel space callers of setsockopt,
> as I plan to remove the set_fs address space override used for it.
For getsockopt, does it make sense to have the core kernel load optval/optlen
into a buffer before calling the protocol driver? Then the driver need not
see the userspace pointer at all.
Similar could be done for setsockopt - allocate a buffer of the size requested
by the user inside the kernel and pass it into the driver, then copy the data
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