linux-kernel - Re: stop breaking dosemu (Re: x86/kconfig/32: Rename CONFIG

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Date:	Thu, 3 Sep 2015 00:12:27 +0300
From:	Stas Sergeev <stsp@...t.ru>
To:	Andy Lutomirski <luto@...capital.net>
Cc:	Josh Boyer <jwboyer@...oraproject.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"Andrew Bird (Sphere Systems)" <ajb@...eresystems.co.uk>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Ingo Molnar <mingo@...nel.org>,
	Kees Cook <keescook@...omium.org>,
	Brian Gerst <brgerst@...il.com>
Subject: Re: stop breaking dosemu (Re: x86/kconfig/32: Rename CONFIG_VM86 and
 default it to 'n')

02.09.2015 23:55, Andy Lutomirski пишет:
> On Wed, Sep 2, 2015 at 1:47 PM, Stas Sergeev <stsp@...t.ru> wrote:
>> 02.09.2015 23:22, Josh Boyer пишет:
>>> On Wed, Sep 2, 2015 at 1:50 PM, Stas Sergeev <stsp@...t.ru> wrote:
>>>> 02.09.2015 20:46, Josh Boyer пишет:
>>>>> On Wed, Sep 2, 2015 at 10:08 AM, Andy Lutomirski <luto@...capital.net>
>>>>> wrote:
>>>>>> I'd be amenable to switching the default back to y and perhaps adding
>>>>>> a sysctl to make the distros more comfortable.  Ingo, Kees, Brian,
>>>>>> what do you think?
>>>>> Can you please leave the default as N, and have a sysctl option to
>>>>> enable it instead?  While dosemu might still be in use, it isn't going
>>>>> to be the common case at all.  So from a distro perspective, I think
>>>>> we'd probably rather have the default match the common case.
>>>> The fact that fedora doesn't package dosemu, doesn't automatically
>>>> mean all other distros do not too. Since when kernel defaults should
>>>> match the ones of fedora?
>>> I didn't say that.
>> What you said was:
>> ---
>>
>> While dosemu might still be in use, it isn't going
>> to be the common case at all.  So from a distro perspective
>>
>> ---
>> ... which is likely true only in fedora circe.
>>
>>>     The default right now is N.
>> In a not yet released kernel, unless I am mistaken.
>> If fedora already provides that kernel, other distros likely not.
>>
>>>     I asked it be left
>>> that way.  That's all.
>> Lets assume its not yet N, unless there was a kernel release already.
>> Its easy to get back if its not too late.
> How about CONFIG_SYSCTL_VM86_DEFAULT which defaults to Y?  Fedora
> could set it to N.
Sorry, I don't understand this sysctl proposal.
Could you please educate me what is it all about?
This sysctl will disable or enable the vm86() syscall at run-time,
right? What does it give us? If you disable something in the
config, this gives you, say, smaller kernel image. If OTOH you
add the run-time switch, it gives you a bigger image, regardless
of its default value.
I might be missing something, but I don't understand what
problem will this solve? Have I missed some earlier message
in this thread?
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