Re: [PATCH 25/26] net: pass a sockptr_t into ->setsockopt

[Christoph Hellwig <hch@xxxxxx>]

On Thu, Aug 06, 2020 at 03:21:25PM -0700, Eric Dumazet wrote:
> converting get_user(...)   to  copy_from_sockptr(...) really assumed the 
> optlen
> has been validated to be >= sizeof(int) earlier.
> 
> Which is not always the case, for example here.

Yes.  And besides the bpfilter mess the main reason I even had to add
the sockptr vs just copying optlen in the high-level socket code.

Please take a look at the patch in the other thread to just revert to
the "dumb" version everywhere.