linux-kernel - Re: [bug] /etc/profile: line 30: /dev/null: Permission denied (Was: Re: [PATCH] Remove broken by design and by implementation devtmpfs maintenance disaster)

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Date:	Fri, 18 Sep 2009 21:35:34 +0200
From:	Kay Sievers <kay.sievers@...y.org>
To:	Greg KH <greg@...ah.com>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Ingo Molnar <mingo@...e.hu>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [bug] /etc/profile: line 30: /dev/null: Permission denied (Was: 
	Re: [PATCH] Remove broken by design and by implementation devtmpfs 
	maintenance disaster)

On Fri, Sep 18, 2009 at 17:37, Kay Sievers <kay.sievers@...y.org> wrote:
> On Fri, Sep 18, 2009 at 17:05, Greg KH <greg@...ah.com> wrote:
>> On Fri, Sep 18, 2009 at 07:18:54AM -0700, Linus Torvalds wrote:
>>>
>>> On Thu, 17 Sep 2009, Greg KH wrote:
>>> >
>>> > I think the udev version in older Fedora releases can't handle this
>>> > kernel option, which is fine, just don't enable it.  Newer versions can
>>> > handle it, right?
>>>
>>> .. conversely, if you can't be bothered to set up /dev/null and /dev/zero
>>> correctly, I would suggest that you not set them up AT ALL in devtmpfs.
>>
>> Fair enough.
>>
>>> The thing is, 0600 for those nodes is just _wrong_. Don't do it.
>>
>> Ok, Kay, care to just treat these as "special"?
>
> Sure, the patch I sent yesterday does that. We might want to drop the
> USB device node permissions (same as the proc nodes), but they are
> probably not needed?
>
> Ingo, do you possibly have a chance to test if your setup comes up
> with that? That would be great to know.

With that patch, I can login as a normal user without any udev ever
started, and no static content copied to /dev.

System boot scripts just complained about ptx stuff because the
creation of the /dev/pts directory, and the missing /dev/shm, which is
both part of udev's bootstrap code here, and which I had removed.

Kay
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