linux-kernel - Re: [PATCH v2 07/18] nios2: drop access_ok() check from __put

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Message-ID: <CAK8P3a34OBFhncvg32hO3qb1uH8cvwFb0ro1jEMT4bdOLrtfdw@mail.gmail.com>
Date:   Thu, 24 Feb 2022 08:05:48 +0100
From:   Arnd Bergmann <arnd@...nel.org>
To:     Dinh Nguyen <dinguyen@...nel.org>
Cc:     Linus Torvalds <torvalds@...ux-foundation.org>,
        Christoph Hellwig <hch@....de>,
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Subject: Re: [PATCH v2 07/18] nios2: drop access_ok() check from __put_user()

On Thu, Feb 24, 2022 at 12:30 AM Dinh Nguyen <dinguyen@...nel.org> wrote:
> On 2/16/22 07:13, Arnd Bergmann wrote: From: Arnd Bergmann <arnd@...db.de>
> >
> > Unlike other architectures, the nios2 version of __put_user() has an
> > extra check for access_ok(), preventing it from being used to implement
> > __put_kernel_nofault().
> >
> > Split up put_user() along the same lines as __get_user()/get_user()
> >
> > Signed-off-by: Arnd Bergmann <arnd@...db.de>
>
> Acked-by: Dinh Nguyen <dinguyen@...nel.org>

Thanks! Could you also have a look at patch 2 (uaccess: fix nios2 and
microblaze get_user_8)? That one is actually more critical, and should
be backported to stable kernels.

       Arnd