linux-kernel - Re: [PATCH] x86/kconfig/32: Make CONFIG

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Date:	Thu, 09 Jul 2015 11:51:03 -0700
From:	Arjan van de Ven <arjan@...ux.intel.com>
To:	Andy Lutomirski <luto@...nel.org>, x86@...nel.org,
	linux-kernel@...r.kernel.org
CC:	Oleg Nesterov <oleg@...hat.com>, Kees Cook <keescook@...omium.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Borislav Petkov <bp@...en8.de>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Austin S Hemmelgarn <ahferroin7@...il.com>,
	Brian Gerst <brgerst@...il.com>,
	Matthew Garrett <mjg59@...f.ucam.org>
Subject: Re: [PATCH] x86/kconfig/32: Make CONFIG_VM86 default to n and remove
 EXPERT

On 7/9/2015 11:40 AM, Andy Lutomirski wrote:
> VM86 is entirely broken if ptrace, syscall auditing, or NOHZ_FULL is
> in use.  The code is a big undocumented mess, it's a real PITA to
> test, and it looks like a big chunk of vm86_32.c is dead code.  It
> also plays awful games with the entry asm.
>
> No one should be using it anyway.  Use DOSBOX or KVM instead.
>
> Let's accelerate its slow death.  Remove it from EXPERT and default
> it to n.  Distros should not enable it.  In the unlikely event that
> some user needs it, they can easily re-enable it.
>
> I've confirmed that 'make oldconfig' will set leave it set to y, so
> there should be little or no unexpected breakage from this change.
>

I would rather do BOTH the default n AND the EXPERT

e.g. the existing hurdle of EXPERT combined with the default
(e.g. off entirely in non-EXPERT, and with EXPERT it is sill defaulting to =n)


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