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

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Date:	Thu, 9 Jul 2015 19:27:25 +0000 (UTC)
From:	Yuhong Bao <yuhongbao_386@...mail.com>
To:	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] x86/kconfig/32: Make CONFIG_VM86 default to n and remove EXPERT

Andy Lutomirski <luto <at> kernel.org> writes:
> 
> 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.

Don't forget that it also depends on the null page being mapped, which is 
why MS disabled it in Win8 by default.

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