Re: [PATCH v2 09/18] mips: use simpler access_ok()

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To: Arnd Bergmann <arnd@xxxxxxxxxx>
Subject: Re: [PATCH v2 09/18] mips: use simpler access_ok()
From: Thomas Bogendoerfer <tsbogend@xxxxxxxxxxxxxxxx>
Date: Tue, 22 Feb 2022 17:36:15 +0100
Cc: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>, Christoph Hellwig <hch@xxxxxx>, linux-arch <linux-arch@xxxxxxxxxxxxxxx>, Linux-MM <linux-mm@xxxxxxxxx>, Linux API <linux-api@xxxxxxxxxxxxxxx>, Arnd Bergmann <arnd@xxxxxxxx>, Linux Kernel Mailing List <linux-kernel@xxxxxxxxxxxxxxx>, Al Viro <viro@xxxxxxxxxxxxxxxxxx>, Russell King - ARM Linux <linux@xxxxxxxxxxxxxxx>, Will Deacon <will@xxxxxxxxxx>, Guo Ren <guoren@xxxxxxxxxx>, Brian Cain <bcain@xxxxxxxxxxxxxx>, Geert Uytterhoeven <geert@xxxxxxxxxxxxxx>, Michal Simek <monstr@xxxxxxxxx>, Nick Hu <nickhu@xxxxxxxxxxxxx>, Greentime Hu <green.hu@xxxxxxxxx>, Dinh Nguyen <dinguyen@xxxxxxxxxx>, Stafford Horne <shorne@xxxxxxxxx>, Helge Deller <deller@xxxxxx>, Michael Ellerman <mpe@xxxxxxxxxxxxxx>, Peter Zijlstra <peterz@xxxxxxxxxxxxx>, Ingo Molnar <mingo@xxxxxxxxxx>, Mark Rutland <mark.rutland@xxxxxxx>, Heiko Carstens <hca@xxxxxxxxxxxxx>, Rich Felker <dalias@xxxxxxxx>, David Miller <davem@xxxxxxxxxxxxx>, Richard Weinberger <richard@xxxxxx>, the arch/x86 maintainers <x86@xxxxxxxxxx>, Max Filippov <jcmvbkbc@xxxxxxxxx>, "Eric W . Biederman" <ebiederm@xxxxxxxxxxxx>, Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>, Ard Biesheuvel <ardb@xxxxxxxxxx>, alpha <linux-alpha@xxxxxxxxxxxxxxx>, "open list:SYNOPSYS ARC ARCHITECTURE" <linux-snps-arc@xxxxxxxxxxxxxxxxxxx>, linux-csky@xxxxxxxxxxxxxxx, "open list:QUALCOMM HEXAGON..." <linux-hexagon@xxxxxxxxxxxxxxx>, linux-ia64@xxxxxxxxxxxxxxx, linux-m68k <linux-m68k@xxxxxxxxxxxxxxx>, "open list:BROADCOM NVRAM DRIVER" <linux-mips@xxxxxxxxxxxxxxx>, Openrisc <openrisc@xxxxxxxxxxxxxxxxxxxx>, Parisc List <linux-parisc@xxxxxxxxxxxxxxx>, linuxppc-dev <linuxppc-dev@xxxxxxxxxxxxxxxx>, linux-riscv <linux-riscv@xxxxxxxxxxxxxxxxxxx>, linux-s390 <linux-s390@xxxxxxxxxxxxxxx>, Linux-sh list <linux-sh@xxxxxxxxxxxxxxx>, sparclinux <sparclinux@xxxxxxxxxxxxxxx>, linux-um <linux-um@xxxxxxxxxxxxxxxxxxx>, "open list:TENSILICA XTENSA PORT (xtensa)" <linux-xtensa@xxxxxxxxxxxxxxxx>
In-reply-to: <CAK8P3a2usZWPDDDUcscwS0aVKsY6aLXFGFPqYNkm4hcDERim9w@mail.gmail.com>
References: <20220216131332.1489939-1-arnd@kernel.org> <20220216131332.1489939-10-arnd@kernel.org> <20220221132456.GA7139@alpha.franken.de> <CAK8P3a2usZWPDDDUcscwS0aVKsY6aLXFGFPqYNkm4hcDERim9w@mail.gmail.com>
User-agent: Mutt/1.10.1 (2018-07-13)

On Mon, Feb 21, 2022 at 03:31:23PM +0100, Arnd Bergmann wrote:
> I'll update it this way, otherwise I'd need help in form of a patch
> that changes the exception handling so __get_user/__put_user
> also return -EFAULT for an address error.

https://lore.kernel.org/all/20220222155345.138861-1-tsbogend@xxxxxxxxxxxxxxxx/

That does the trick.

Thomas.

-- 
Crap can work. Given enough thrust pigs will fly, but it's not necessarily a
good idea.                                                [ RFC1925, 2.3 ]

References:
- [PATCH v2 00/18] clean up asm/uaccess.h, kill set_fs for good
  - From: Arnd Bergmann
- [PATCH v2 09/18] mips: use simpler access_ok()
  - From: Arnd Bergmann
- Re: [PATCH v2 09/18] mips: use simpler access_ok()
  - From: Thomas Bogendoerfer
- Re: [PATCH v2 09/18] mips: use simpler access_ok()
  - From: Arnd Bergmann

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