linux-kernel - Re: [PATCH v2 20/27] compat_ioctl: simplify the implementation

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Date:   Fri, 7 Feb 2020 17:06:34 +0000
From:   Arnd Bergmann <arnd@...db.de>
To:     youling257 <youling257@...il.com>
Cc:     Jens Axboe <axboe@...nel.dk>,
        "James E.J. Bottomley" <jejb@...ux.ibm.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        linux-scsi <linux-scsi@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        linux-block <linux-block@...r.kernel.org>,
        Linux FS-devel Mailing List <linux-fsdevel@...r.kernel.org>
Subject: Re: [PATCH v2 20/27] compat_ioctl: simplify the implementation

On Fri, Feb 7, 2020 at 8:22 AM youling257 <youling257@...il.com> wrote:
>
> This patch cause a problem on 64bit kernel 32bit userspace.
> My 32bit Androidx86 userspace run on 64bit mainline kernel, this patch caused some app not detect root permission.

Thanks for you work in bisecting the issue to my patch, sorry to have
caused you trouble. After Christian Zigotzky
also reported a problem in this file, I have been able to find a
specific bug and just submitted a patch for it.

Please have a look if that fix addresses your problem, as it's
possible that there was more than one bug introduced
by the original patch.

       Arnd