From: Dave Hansen <dave@sr71.net>
To: Andy Lutomirski <luto@amacapital.net>
Cc: "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
Thomas Gleixner <tglx@linutronix.de>, X86 ML <x86@kernel.org>,
Dave Hansen <dave.hansen@linux.intel.com>
Subject: Re: [PATCH 1/2] x86, mpx: explicitly disable 32-bit MPX support on 64-bit kernels
Date: Mon, 22 Dec 2014 12:21:35 -0800 [thread overview]
Message-ID: <54987D4F.3000908@sr71.net> (raw)
In-Reply-To: <CALCETrWAgPjLTA-iSabFmqVKiOKGPGgDgSWdjz3wsncs1X+WOg@mail.gmail.com>
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?
next prev parent reply other threads:[~2014-12-22 20:21 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-12-22 20:08 [PATCH 0/2] x86, mpx: Fixes for 3.19 Dave Hansen
2014-12-22 20:08 ` [PATCH 1/2] x86, mpx: explicitly disable 32-bit MPX support on 64-bit kernels Dave Hansen
2014-12-22 20:17 ` Andy Lutomirski
2014-12-22 20:21 ` Dave Hansen [this message]
2014-12-22 20:27 ` Andy Lutomirski
2014-12-23 9:19 ` Ingo Molnar
2014-12-23 18:48 ` Andy Lutomirski
2014-12-22 20:08 ` [PATCH 2/2] x86 mpx: fix potential performance issue on unmaps Dave Hansen
2014-12-23 9:14 ` Ingo Molnar
2015-01-09 18:47 ` Dave Hansen
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