linux-kernel - Re: [PATCH 1/2] x86, mpx: explicitly disable 32-bit MPX support on 64-bit kernels

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Message-ID: <54987D4F.3000908@sr71.net>
Date:	Mon, 22 Dec 2014 12:21:35 -0800
From:	Dave Hansen <dave@...1.net>
To:	Andy Lutomirski <luto@...capital.net>
CC:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Thomas Gleixner <tglx@...utronix.de>, X86 ML <x86@...nel.org>,
	Dave Hansen <dave.hansen@...ux.intel.com>
Subject: Re: [PATCH 1/2] x86, mpx: explicitly disable 32-bit MPX support on
 64-bit kernels

On 12/22/2014 12:17 PM, Andy Lutomirski wrote:
>> >         /*
>> > +        * 32-bit binaries on 64-bit kernels are currently
>> > +        * unsupported.
>> > +        */
>> > +       if (IS_ENABLED(CONFIG_X86_64) && test_thread_flag(TIF_IA32))
>> > +               return MPX_INVALID_BOUNDS_DIR;
> Should this check mm->ia32_compat instead?

set_personality_64bit/ia32() seem to make that and TIF_IA32 awfully
equivalent.  Is there a specific reason for wanting it done this way?
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