From: Shuah Khan <skhan@linuxfoundation.org>
To: Mauro Carvalho Chehab <mchehab@kernel.org>
Cc: Leon Romanovsky <leon@kernel.org>,
Geert Uytterhoeven <geert@linux-m68k.org>,
James Morris <jmorris@namei.org>,
Julia Lawall <julia.lawall@inria.fr>,
Stephen Hemminger <stephen@networkplumber.org>,
Roland Dreier <roland@kernel.org>,
Steven Rostedt <rostedt@goodmis.org>,
James Bottomley <James.Bottomley@hansenpartnership.com>,
ksummit@lists.linux.dev, Shuah Khan <skhan@linuxfoundation.org>
Subject: Re: [MAINTAINER SUMMIT] Rethinking the acceptance policy for "trivial" patches
Date: Fri, 23 Apr 2021 16:41:38 -0600 [thread overview]
Message-ID: <a0572704-05c9-d9a4-c930-ba3de573f8d9@linuxfoundation.org> (raw)
In-Reply-To: <20210423110643.4b28c29b@coco.lan>
On 4/23/21 3:06 AM, Mauro Carvalho Chehab wrote:
> Em Thu, 22 Apr 2021 09:38:03 -0600
> Shuah Khan <skhan@linuxfoundation.org> escreveu:
>
>> On 4/22/21 6:18 AM, Leon Romanovsky wrote:
>>> On Thu, Apr 22, 2021 at 11:55:11AM +0200, Mauro Carvalho Chehab wrote:
>>>> Em Thu, 22 Apr 2021 09:34:38 +0200
>>>> Geert Uytterhoeven <geert@linux-m68k.org> escreveu:
>>>>
>>>>> On Wed, Apr 21, 2021 at 11:50 PM James Morris <jmorris@namei.org> wrote:
>>>>>> On Wed, 21 Apr 2021, Julia Lawall wrote:
>>>>>>> The apology states that they didn't detect any vulnerabilities. They
>>>>>>> found three non exploitable bugs and submitted incorrect patches for them.
>>>>>>> When the patches received some positive feedback, they explained that the
>>>>>>> patches were incorrect and provided a proper fix.
>>>>>>>
>>>>>>> So they damaged trust, but not actually the Linux kernel...
>>>>>>
>>>>>> The issue is that there was no consent and no coordination, so we don't
>>>>>> know the scope of the experiment and whether it was still continuing.
>>>>>>
>>>>>> We are this not able to trust anything the group said about what they'd
>>>>>> done or not done, until now [1].
>>>>>>
>>>>>> In all probability there is nothing further amiss but we would not have
>>>>>> expected them to use fake gmail accounts to submit bugs to the kernel
>>>>>> either.
>>>>>>
>>>>>> It's now on us to audit all of their known contributions, because we don't
>>>>>> know the scope of the experiment, which was based on the use of deception,
>>>>>> and we can't make any assumptions based on what they have said.
>>>>>>
>>>>>> We also need the identity of the 'random' gmail accounts they used,
>>>>>> although this should be handled by a small trusted group in private, as it
>>>>>> will lead to privacy issues for kernel maintainers who responded to them
>>>>>> in public.
>>>>>
>>>>> What do we gain by blindly reverting all[1] umn.edu patches, and
>>>>> ignoring future patches from umn.edu?
>>>>> I think all of this is moot: other people may be doing the same thing,
>>>>> or even "in worse faith". The only thing that helps is making sure
>>>>> patches get reviewed[2] before being applied.
>>>>>
>>>>> [1] Judging from the new review comments, many of the 190 patches
>>>>> to be reverted were real fixes.
>>>>
>>>> The reverted ones for media (29 patches) didn't contain any malicious code.
>>>> One was useless (because the media core already fixes the pointed issue),
>>>> but the other ones were valid patches.
>>>
>>> I'm sorry that I didn't check all media commits, but this random commit
>>> 467a37fba93f ("media: dvb: Add check on sp8870_readreg") has a bug and
>>> broke sp8870 (I don't know what is it).
>>>
>>> diff --git a/drivers/media/dvb-frontends/sp8870.c b/drivers/media/dvb-frontends/sp8870.c
>>> index 8d31cf3f4f07..270a3c559e08 100644
>>> --- a/drivers/media/dvb-frontends/sp8870.c
>>> +++ b/drivers/media/dvb-frontends/sp8870.c
>>> @@ -293,7 +293,9 @@ static int sp8870_set_frontend_parameters(struct dvb_frontend *fe)
>>> sp8870_writereg(state, 0xc05, reg0xc05);
>>>
>>> // read status reg in order to clear pending irqs
>>> - sp8870_readreg(state, 0x200);
>>> + err = sp8870_readreg(state, 0x200);
>>> + if (err)
>>> + return err;
>>>
>>> // system controller start
>>> sp8870_microcontroller_start(state);
>>>
>>>
>>> 67 static int sp8870_readreg (struct sp8870_state* state, u16 reg)
>>> 68 {
>>> 69 int ret;
>>> <...>
>>> 77 if (ret != 2) {
>>> 78 dprintk("%s: readreg error (ret == %i)\n", __func__, ret);
>>> 79 return -1;
>>> 80 }
>>> 81
>>> 82 return (b1[0] << 8 | b1[1]);
>>> 83 }
>>>
>>> The valid check should be if (err < 0);
>>>
>>
>> Correct. Like all the other callers of sp8870_readreg() do with
>> its return. Non-zero return is valid for this routine.
>
> This particular patch is completely broken and should be reverted.
> Also, probably a comment should be added to ensure that people won't
> try to send us similar "trivial" fixes.
>
> Basically, the logic at sp8870_set_frontend_parameters() is called
> when tuning into a new DVB-T channel. the call there for
>
> sp8870_readreg(state, 0x200);
>
> Seems to be there just to reset IRQ registers. It should _not_ check
> the return results on this particular case.
>
> Yet, this driver was written back in 1999 for a DVB-T device that
> used to be available on that time. Just one driver (av7110) can
> use such tuner. Those PCI chipsets had stopped produced a very long
> time ago. Even the company that used to produce av7110 has long
> gone, more than 17 years ago.
>
> I guess it is time to get rid of av7110 and the ancillary drivers
> used only on it.
>
Mauro,
Quick search shows me the following. Are you saying all of these
can be removed??
drivers/media/dvb-frontends/Kconfig
config DVB_SP8870
grep AV7 drivers/media/pci/ttpci/Kconfig
config DVB_AV7110_IR
depends on RC_CORE=y || RC_CORE = DVB_AV7110
default DVB_AV7110
config DVB_AV7110
tristate "AV7110 cards"
Support for SAA7146 and AV7110 based DVB cards as produced
config DVB_AV7110_OSD
bool "AV7110 OSD support"
depends on DVB_AV7110
default y if DVB_AV7110=y || DVB_AV7110=m
The AV7110 firmware provides some code to generate an OnScreenDisplay
tristate "AV7110 cards with Budget Patch"
depends on DVB_AV7110
SAA7146+AV7110 based cards (DVB-S cards). This
standard AV7110 driver prior to loading this
thanks,
-- Shuah
next prev parent reply other threads:[~2021-04-23 22:41 UTC|newest]
Thread overview: 153+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-04-21 18:35 [MAINTAINER SUMMIT] Rethinking the acceptance policy for "trivial" patches James Bottomley
2021-04-21 18:46 ` Christian Borntraeger
2021-04-21 18:51 ` Alexey Dobriyan
2021-04-21 18:53 ` Christian Borntraeger
2021-04-21 19:06 ` Al Viro
2021-04-21 19:14 ` James Bottomley
2021-04-21 19:22 ` Steven Rostedt
2021-04-21 19:26 ` Kees Cook
2021-04-21 19:32 ` Roland Dreier
2021-04-21 19:55 ` Julia Lawall
2021-04-21 20:28 ` Stephen Hemminger
2021-04-21 20:37 ` Julia Lawall
2021-04-21 20:45 ` Steven Rostedt
2021-04-21 20:50 ` Julia Lawall
2021-04-21 21:03 ` Jiri Kosina
2021-04-21 21:37 ` James Morris
2021-04-22 7:34 ` Geert Uytterhoeven
2021-04-22 7:51 ` Mike Rapoport
2021-04-22 8:45 ` Christian Brauner
2021-04-22 15:27 ` Steven Rostedt
2021-04-22 9:39 ` Mauro Carvalho Chehab
2021-04-22 9:55 ` Mauro Carvalho Chehab
2021-04-22 12:01 ` Leon Romanovsky
2021-04-22 12:26 ` Mark Brown
2021-04-22 12:35 ` Leon Romanovsky
2021-04-22 12:52 ` Hans Verkuil
2021-04-22 13:33 ` Mauro Carvalho Chehab
2021-04-22 13:42 ` Leon Romanovsky
2021-04-22 12:18 ` Leon Romanovsky
2021-04-22 15:38 ` Shuah Khan
2021-04-23 9:06 ` Mauro Carvalho Chehab
2021-04-23 17:17 ` Leon Romanovsky
2021-04-23 22:41 ` Shuah Khan [this message]
2021-04-22 5:59 ` Christoph Hellwig
2021-04-22 6:28 ` Tomasz Figa
2021-04-22 7:05 ` Al Viro
2021-04-22 7:46 ` Al Viro
2021-04-22 7:06 ` H. Peter Anvin
2021-04-22 7:05 ` Jiri Kosina
2021-04-22 16:05 ` Roland Dreier
2021-04-22 16:24 ` Krzysztof Kozlowski
2021-04-22 18:03 ` Al Viro
2021-04-22 22:35 ` Thomas Gleixner
2021-04-22 22:53 ` Laurent Pinchart
2021-07-20 16:26 ` Kernel sustainability (was Re: [MAINTAINER SUMMIT] Rethinking the acceptance policy for "trivial" patches) Daniel Vetter
2021-04-21 19:30 ` [MAINTAINER SUMMIT] Rethinking the acceptance policy for "trivial" patches Jiri Kosina
2021-04-21 20:28 ` Jiri Kosina
2021-04-21 22:18 ` Shuah Khan
2021-04-21 23:17 ` Guenter Roeck
2021-04-21 23:21 ` Shuah Khan
2021-04-21 19:47 ` Dan Carpenter
2021-04-22 9:34 ` Mauro Carvalho Chehab
2021-04-22 9:59 ` Johannes Berg
2021-04-22 10:52 ` Mauro Carvalho Chehab
2021-04-22 12:16 ` Mike Rapoport
2021-04-22 13:41 ` Mauro Carvalho Chehab
2021-04-22 20:15 ` Alexandre Belloni
2021-04-23 0:09 ` Randy Dunlap
2021-04-21 19:49 ` Alexandre Belloni
2021-04-22 2:05 ` Martin K. Petersen
2021-04-22 3:04 ` Joe Perches
2021-04-22 10:13 ` Mauro Carvalho Chehab
2021-04-22 12:07 ` Mark Brown
2021-04-22 16:42 ` Bart Van Assche
2021-04-22 17:58 ` Jiri Kosina
2021-04-22 4:21 ` Leon Romanovsky
2021-04-22 4:56 ` Al Viro
2021-04-22 5:52 ` Leon Romanovsky
2021-04-22 6:05 ` Christoph Hellwig
2021-04-22 6:03 ` Christoph Hellwig
2021-04-22 6:18 ` Leon Romanovsky
2021-04-22 9:20 ` Mauro Carvalho Chehab
2021-04-22 11:34 ` Leon Romanovsky
2021-04-22 13:22 ` Mark Brown
2021-04-22 13:47 ` Leon Romanovsky
2021-04-22 13:51 ` Mark Brown
2021-04-22 14:12 ` Mauro Carvalho Chehab
2021-04-22 14:51 ` Leon Romanovsky
2021-04-22 13:29 ` Steven Rostedt
2021-04-22 13:58 ` Leon Romanovsky
2021-04-22 14:20 ` Rob Herring
2021-04-23 6:04 ` Mauro Carvalho Chehab
2021-04-23 6:46 ` Joe Perches
2021-04-23 7:13 ` Mauro Carvalho Chehab
2021-04-23 7:20 ` [PATCH RFC] scripts: add a script for sending patches Mauro Carvalho Chehab
2021-04-23 14:52 ` Better tools for sending patches (was: Re: [MAINTAINER SUMMIT] Rethinking the acceptance policy for "trivial" patches) Doug Anderson
2021-04-23 16:03 ` Mark Brown
2021-04-23 17:12 ` Leon Romanovsky
2021-04-26 23:50 ` Simon Glass
2021-04-22 12:53 ` [MAINTAINER SUMMIT] Rethinking the acceptance policy for "trivial" patches Konstantin Ryabitsev
2021-04-22 13:08 ` Leon Romanovsky
2021-04-22 13:27 ` Konstantin Ryabitsev
2021-04-22 13:41 ` Leon Romanovsky
2021-04-22 16:28 ` Serge E. Hallyn
2021-04-22 17:56 ` Leon Romanovsky
2021-04-22 18:05 ` backfilling threads with b4 (was: Re: [MAINTAINER SUMMIT] Rethinking the acceptance policy for "trivial" patches) Konstantin Ryabitsev
2021-04-23 7:19 ` [MAINTAINER SUMMIT] Rethinking the acceptance policy for "trivial" patches Greg KH
2021-04-23 7:31 ` Christian Brauner
2021-04-23 18:50 ` Konstantin Ryabitsev
2021-04-22 12:40 ` Mark Brown
2021-04-22 12:54 ` Mike Rapoport
2021-04-22 13:23 ` Mark Brown
2021-04-22 15:19 ` Steven Rostedt
2021-04-22 21:19 ` Thomas Gleixner
2021-04-22 21:36 ` Steven Rostedt
2021-04-22 22:39 ` Thomas Gleixner
2021-04-23 0:26 ` Joe Perches
2021-04-23 6:15 ` Greg KH
2021-04-23 6:50 ` Dan Williams
2021-04-23 7:13 ` Geert Uytterhoeven
2021-04-23 14:41 ` Shuah Khan
2021-04-23 9:12 ` Michal Hocko
2021-04-22 14:51 ` Laurent Pinchart
2021-04-22 15:14 ` Mike Rapoport
2021-04-22 15:17 ` Laurent Pinchart
2021-04-22 15:35 ` Al Viro
2021-04-22 15:32 ` Shuah Khan
2021-04-22 10:35 ` Mauro Carvalho Chehab
2021-04-22 11:03 ` Sudip Mukherjee
2021-04-22 14:00 ` Steven Rostedt
2021-04-22 14:07 ` Jiri Kosina
2021-04-22 15:31 ` Sudip Mukherjee
2021-04-22 21:33 ` Thomas Gleixner
2021-04-22 20:28 ` Andrew Morton
2021-04-22 20:46 ` Steven Rostedt
2021-04-22 12:32 ` Martin K. Petersen
2021-04-22 15:11 ` Laurent Pinchart
2021-04-22 15:28 ` James Bottomley
2021-04-22 15:35 ` Johannes Berg
2021-04-22 15:36 ` Mark Brown
2021-04-22 15:40 ` James Bottomley
2021-04-23 9:27 ` Dan Carpenter
2021-04-22 13:24 ` Konstantin Ryabitsev
2021-04-22 14:31 ` Mauro Carvalho Chehab
2021-04-22 15:34 ` Shuah Khan
2021-04-22 15:42 ` James Bottomley
2021-04-22 15:48 ` James Bottomley
2021-04-22 15:52 ` Steven Rostedt
2021-04-22 16:08 ` Shuah Khan
2021-04-22 16:13 ` Jan Kara
2021-04-22 17:04 ` Steven Rostedt
2021-04-22 17:08 ` Martin K. Petersen
2021-04-23 11:16 ` Jan Kara
2021-04-23 12:57 ` Mauro Carvalho Chehab
2021-04-23 7:58 ` Mauro Carvalho Chehab
2021-04-23 10:54 ` Greg KH
2021-04-23 17:09 ` Leon Romanovsky
2021-04-22 16:23 ` Konstantin Ryabitsev
2021-04-22 16:38 ` Bart Van Assche
2021-04-22 16:57 ` Leon Romanovsky
2021-04-22 18:03 ` Jiri Kosina
2021-04-22 21:26 ` Thomas Gleixner
2021-04-22 21:36 ` Jiri Kosina
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