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From: Hans Verkuil <hverkuil-cisco@xs4all.nl>
To: Arnd Bergmann <arnd@kernel.org>,
	Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Cc: Mauro Carvalho Chehab <mchehab@kernel.org>,
	"Lad, Prabhakar" <prabhakar.csengg@gmail.com>,
	Eduardo Valentin <edubezval@gmail.com>,
	Sakari Ailus <sakari.ailus@linux.intel.com>,
	Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	Vaibhav Gupta <vaibhavgupta40@gmail.com>,
	Liu Shixin <liushixin2@huawei.com>,
	Jacopo Mondi <jacopo+renesas@jmondi.org>,
	Andy Shevchenko <andriy.shevchenko@linux.intel.com>,
	Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
	Linux Media Mailing List <linux-media@vger.kernel.org>,
	linux-staging@lists.linux.dev
Subject: Re: [PATCH v3 4/8] media: subdev: remove VIDIOC_DQEVENT_TIME32 handling
Date: Tue, 15 Jun 2021 10:48:37 +0200	[thread overview]
Message-ID: <e3162d4c-d40d-442d-39a0-c99c4328932e@xs4all.nl> (raw)
In-Reply-To: <CAK8P3a1+cWFn8=xyGwZ0c7fWr6+tdEF_sXtMpPCZypDBA_UryA@mail.gmail.com>

On 15/06/2021 10:43, Arnd Bergmann wrote:
> On Mon, Jun 14, 2021 at 7:02 PM Laurent Pinchart
> <laurent.pinchart@ideasonboard.com> wrote:
>>
>> On Mon, Jun 14, 2021 at 12:34:05PM +0200, Arnd Bergmann wrote:
>>> From: Arnd Bergmann <arnd@arndb.de>
>>>
>>> Converting the VIDIOC_DQEVENT_TIME32/VIDIOC_DQEVENT32/
>>> VIDIOC_DQEVENT32_TIME32 arguments to the canonical form is done in common
>>> code, but for some reason I ended up adding another conversion helper to
>>> subdev_do_ioctl() as well. I must have concluded that this does not go
>>> through the common conversion, but it has done that since the ioctl
>>> handler was first added.
>>>
>>> I assume this one is harmless as there should be no way to arrive here
>>> from user space, but since it is dead code, it should just get removed.

I changed this to:

"I assume this one is harmless as there should be no way to arrive here
from user space if CONFIG_COMPAT_32BIT_TIME is set,"

If it is not set, then this will just fall into the default case and is
handled as if it is a potential custom ioctl, as you would expect.

Let me know if you have a better text, I can still update it.

Regards,

	Hans

>>
>> If I'm not mistaken, this could be reached when
>> !CONFIG_COMPAT_32BIT_TIME, can't it ? Still, there's no need for this
>> code in that case, so it seems fine to me.
> 
> Yes, that is correct, I missed that condition. We definitely should not handle
> the command in that case.
> 
> Hans, since you mentioned you would pick up this patch, I assume  you
> are going to reword the patch as you see fit. If you prefer me to resend it,
> let me know.
> 
>        Arnd
> 


  reply	other threads:[~2021-06-15  8:48 UTC|newest]

Thread overview: 24+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-06-14 10:34 [PATCH v3 0/7] media: v4l2: compat ioctl fixes Arnd Bergmann
2021-06-14 10:34 ` [PATCH v3 1/8] media: v4l2-core: ignore native time32 ioctls on 64-bit Arnd Bergmann
2021-06-14 13:24   ` Andy Shevchenko
2021-06-14 16:50   ` Laurent Pinchart
2021-06-14 10:34 ` [PATCH v3 2/8] media: v4l2-core: explicitly clear ioctl input data Arnd Bergmann
2021-06-14 16:56   ` Laurent Pinchart
2021-06-14 10:34 ` [PATCH v3 3/8] media: v4l2-core: fix whitespace damage in video_get_user() Arnd Bergmann
2021-06-14 16:58   ` Laurent Pinchart
2021-06-14 10:34 ` [PATCH v3 4/8] media: subdev: remove VIDIOC_DQEVENT_TIME32 handling Arnd Bergmann
2021-06-14 17:02   ` Laurent Pinchart
2021-06-15  8:43     ` Arnd Bergmann
2021-06-15  8:48       ` Hans Verkuil [this message]
2021-06-15  9:30         ` Arnd Bergmann
2021-06-14 10:34 ` [PATCH v3 5/8] media: v4l2-core: return -ENODEV from ioctl when not registered Arnd Bergmann
2021-06-14 17:04   ` Laurent Pinchart
2021-06-14 17:04   ` Laurent Pinchart
2021-06-14 10:34 ` [PATCH v3 6/8] media: atomisp: remove compat_ioctl32 code Arnd Bergmann
2021-06-14 17:07   ` Laurent Pinchart
2021-06-14 10:34 ` [PATCH v3 7/8] media: subdev: fix compat_ioctl32 Arnd Bergmann
2021-06-14 17:18   ` Laurent Pinchart
2021-06-15  8:26     ` Hans Verkuil
2021-06-15  8:39       ` Arnd Bergmann
2021-06-14 10:34 ` [PATCH v3 8/8] media: subdev: disallow ioctl for saa6588/davinci Arnd Bergmann
2021-06-14 17:21   ` Laurent Pinchart

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