linux-kernel - Re: [PATCH 03/14] nds32: fix access_ok() checks in get/put

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Date:   Mon, 14 Feb 2022 09:01:10 -0800
From:   Christoph Hellwig <hch@...radead.org>
To:     Arnd Bergmann <arnd@...nel.org>
Cc:     Linus Torvalds <torvalds@...ux-foundation.org>,
        Christoph Hellwig <hch@....de>, linux-arch@...r.kernel.org,
        linux-mm@...ck.org, linux-api@...r.kernel.org, arnd@...db.de,
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Subject: Re: [PATCH 03/14] nds32: fix access_ok() checks in get/put_user

On Mon, Feb 14, 2022 at 05:34:41PM +0100, Arnd Bergmann wrote:
> From: Arnd Bergmann <arnd@...db.de>
> 
> The get_user()/put_user() functions are meant to check for
> access_ok(), while the __get_user()/__put_user() functions
> don't.
> 
> This broke in 4.19 for nds32, when it gained an extraneous
> check in __get_user(), but lost the check it needs in
> __put_user().

Can we follow the lead of MIPS (which this was originally copied
from I think) and kill the pointless __get/put_user_check wrapper
that just obsfucate the code?