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Date: Mon, 14 Feb 2022 09:01:10 -0800
From: Christoph Hellwig <hch@infradead.org>
Subject: Re: [PATCH 03/14] nds32: fix access_ok() checks in get/put_user
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 <20220214163452.1568807-4-arnd@kernel.org>
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To: Arnd Bergmann <arnd@kernel.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>, Christoph Hellwig <hch@lst.de>, linux-arch@vger.kernel.org, linux-mm@kvack.org, linux-api@vger.kernel.org, arnd@arndb.de, linux-kernel@vger.kernel.org, mark.rutland@arm.com, dalias@libc.org, linux-ia64@vger.kernel.org, linux-sh@vger.kernel.org, peterz@infradead.org, jcmvbkbc@gmail.com, guoren@kernel.org, sparclinux@vger.kernel.org, linux-hexagon@vger.kernel.org, linux-riscv@lists.infradead.org, will@kernel.org, ardb@kernel.org, linux-s390@vger.kernel.org, bcain@codeaurora.org, deller@gmx.de, x86@kernel.org, linux@armlinux.org.uk, linux-csky@vger.kernel.org, mingo@redhat.com, geert@linux-m68k.org, linux-snps-arc@lists.infradead.org, linux-xtensa@linux-xtensa.org, hca@linux.ibm.com, linux-alpha@vger.kernel.org, linux-um@lists.infradead.org, linux-m68k@lists.linux-m68k.org, openrisc@lists.librecores.org, green.hu@gmail.com, shorne@gmail.com, linux-arm-kernel@lists.infradead.org, monstr@monstr.eu, tsbogend@alpha.franken.de, linux-parisc@vger.kernel.org, nickhu@andestech.com, linux-mips@vger.kernel.org, stable@vger.kernel.org, dinguyen@kernel.org, ebiederm@xmission.com, richard@nod.at, akpm@linux-foundation.org, linuxppc-dev@lists.ozlabs.org, davem@davemloft.net

On Mon, Feb 14, 2022 at 05:34:41PM +0100, Arnd Bergmann wrote:
> From: Arnd Bergmann <arnd@arndb.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?

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