linux-kernel - Re: [tip:x86/asm] x86/asm/entry: Add user_mode_ignore

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Message-ID: <20150324194402.GA27598@gmail.com>
Date:	Tue, 24 Mar 2015 20:44:02 +0100
From:	Ingo Molnar <mingo@...nel.org>
To:	Andy Lutomirski <luto@...capital.net>
Cc:	"H. Peter Anvin" <hpa@...or.com>,
	Brad Spengler <spender@...ecurity.net>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Borislav Petkov <bp@...en8.de>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Andrew Lutomirski <luto@...nel.org>,
	Denys Vlasenko <dvlasenk@...hat.com>,
	"linux-tip-commits@...r.kernel.org" 
	<linux-tip-commits@...r.kernel.org>
Subject: Re: [tip:x86/asm] x86/asm/entry: Add user_mode_ignore_vm86()


* Andy Lutomirski <luto@...capital.net> wrote:

> On Mon, Mar 23, 2015 at 5:26 AM, tip-bot for Andy Lutomirski
> <tipbot@...or.com> wrote:
> > Commit-ID:  a67e7277d01ccfd39b0db5a198c2643cc19dd79c
> > Gitweb:     http://git.kernel.org/tip/a67e7277d01ccfd39b0db5a198c2643cc19dd79c
> > Author:     Andy Lutomirski <luto@...nel.org>
> > AuthorDate: Wed, 18 Mar 2015 18:33:29 -0700
> > Committer:  Ingo Molnar <mingo@...nel.org>
> > CommitDate: Mon, 23 Mar 2015 11:13:36 +0100
> >
> > x86/asm/entry: Add user_mode_ignore_vm86()
> >
> > user_mode() is dangerous and user_mode_vm() has a confusing name.
> >
> > Add user_mode_ignore_vm86() (equivalent to current user_mode()). 
> > We'll change the small number of legitimate users of user_mode() 
> > to user_mode_ignore_vm86().
> >
> > Inspired by grsec, although this works rather differently.
> 
> Ingo, does this mean that you changed your mind or do you still want 
> a patch to delete user_mode_ignore_vm86 and just use user_mode 
> everywhere instead?

Would be still nice to have it as an add on patch, if you agree with 
my arguments.

I picked up your series as-is because it's correct and because it 
already improves things a lot in this area.

Thanks,

	Ingo
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