[PATCH 02/11] fs: don't allow kernel reads and writes without iter ops

[Kees Cook]

On Mon, Aug 17, 2020 at 09:32:03AM +0200, Christoph Hellwig wrote:
> Don't allow calling ->read or ->write with set_fs as a preparation for
> killing off set_fs.  All the instances that we use kernel_read/write on
> are using the iter ops already.
> 
> If a file has both the regular ->read/->write methods and the iter
> variants those could have different semantics for messed up enough
> drivers.  Also fails the kernel access to them in that case.
> 
> Signed-off-by: Christoph Hellwig <hch at lst.de>

Reviewed-by: Kees Cook <keescook at chromium.org>

-- 
Kees Cook