Re: [PATCH v5] init: Disable defaults if init= fails

From: Frank Rowand
Date: Wed Oct 15 2014 - 02:37:37 EST

On 10/14/2014 10:56 PM, Andy Lutomirski wrote:
> On Tue, Oct 14, 2014 at 10:46 PM, Frank Rowand <frowand.list@xxxxxxxxx> wrote:
>> On 10/14/2014 2:21 PM, Andy Lutomirski wrote:
>>> On Tue, Oct 14, 2014 at 2:00 PM, Andrew Morton
>>> <akpm@xxxxxxxxxxxxxxxxxxxx> wrote:
>>>> On Wed, 1 Oct 2014 11:13:14 -0700 Andy Lutomirski <luto@xxxxxxxxxxxxxx> wrote:
>>>>> On Wed, Oct 1, 2014 at 11:05 AM, <josh@xxxxxxxxxxxxxxxx> wrote:
>>>>>> On Tue, Sep 30, 2014 at 09:53:56PM -0700, Andy Lutomirski wrote:
>>>>>>> I significantly prefer default N. Scripts that play with init= really
>>>>>>> don't want the fallback, and I can imagine contexts in which it could
>>>>>>> be a security problem.
>>>>>> While I certainly would prefer the non-fallback behavior for init as
>>>>>> well, standard kernel practice has typically been to use "default y" for
>>>>>> previously built-in features that become configurable. And I'd
>>>>>> certainly prefer a compile-time configuration option like this (even
>>>>>> with default y) over a "strictinit" kernel command-line option.
>>>>> Fair enough.
>>>>> So: "default y" for a release or two, then switch the default? Having
>>>>> default y will annoy virtme, though it's not the end of the world.
>>>>> Virtme is intended to work with more-or-less-normal kernels.
>>>> Adding another Kconfig option is tiresome. What was wrong with strictinit=?
>>> The consensus seems to be that adding a non-default option to get
>> ^^^^^^^^^ I do not think you know what the word consensus means. :-)
>> I did not agree.
>> I do agree with Andrew (but with no opinion on whether "strictinit=SOMETHING"
>> or just "strictinit".
>>> sensible behavior would be unfortunate. Also, I don't like
> Even you're not disagreeing that it's ugly, though, FWIW.

You are putting (lack of) words in my mouth. I did not comment on
"ugly" because it did not seem that big a deal to me. I have no
desire to bikeshed on ugly in this particular instance.

>> ^^^^^^^^^^^^^^^^^
>> behavior that is useful in some or many contexts
> Is there a context in which the current behavior is useful beyond
> "whoops, I typoed my grub command line edit, and I still want my
> system to boot into *something* even if it's the wrong thing"? I'm
> not personally that sympathetic to that particular use case, but maybe
> there's another one.

We've been through this before. I should have ignored your "sensible
behavior" comment. Sorry, again no need for me to bike shed on that.

The question from Andrew was whether to use a config option or a command
line option. One could choose either behavior as default, whether
controlled by command line or config option.

> --Andy
>>> strictinit=, since backwards-compatible setups will have to do
>>> init=foo strictinit=foo. My original proposal was init=foo
>>> strictinit.
>>> TBH, my preference would be to make strict mode unconditional.
>>> --Andy

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