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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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