From: Christoph Hellwig

Sent: 20 July 2020 13:47

setsockopt is the last place in architecture-independ code that still
uses set_fs to force the uaccess routines to operate on kernel pointers.

This series adds a new sockptr_t type that can contained either a kernel
or user pointer, and which has accessors that do the right thing, and
then uses it for setsockopt, starting by refactoring some low-level
helpers and moving them over to it before finally doing the main
setsockopt method.

Another 'gotcha' ...

On an least some architectures (possibly only m68k) IIRC all structures
are actually passed by reference.
(This used to be true for sparc - but it may have changed in the
last 30 years.)

	David
 

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