From: Andi Kleen <andi@firstfloor.org>
To: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Andy Lutomirski <luto@amacapital.net>,
linux-kernel@vger.kernel.org, x86@kernel.org,
Thomas Gleixner <tglx@linutronix.de>
Subject: Re: [PATCH 3.19 3/3] x86, mpx: Change the MPX enable/disable API to arch_prctl
Date: Mon, 05 Jan 2015 12:42:08 -0800 [thread overview]
Message-ID: <87mw5x0xjz.fsf@tassilo.jf.intel.com> (raw)
In-Reply-To: <54A64E6D.1020304@linux.intel.com> (Dave Hansen's message of "Thu, 01 Jan 2015 23:53:17 -0800")
Dave Hansen <dave.hansen@linux.intel.com> writes:
> On 12/29/2014 04:52 PM, Andy Lutomirski wrote:
>> This has the benefit the it avoids cluttering prctl with more
>> arch-specific functionality. The down side is that arch_prctl will
>> need to be wired up as a 32-bit syscall to add 32-bit support for
>> MPX.
>
> There is existing userspace out there which depends on the existing
> prctl() setup. There isn't a _lot_ and it might still be able to be
> changed easily, but this isn't a given.
>
> I'll check in with the folks doing the gcc (runtime) part of this next
> week and see what they think.
It'll be quite messy for 32bit because they would need to use syscall(),
as glibc won't have a arch_prctl stub.
-Andi
--
ak@linux.intel.com -- Speaking for myself only
next prev parent reply other threads:[~2015-01-05 20:42 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-12-30 0:52 [PATCH 3.19 0/3] Possible MPX improvements for 3.19 Andy Lutomirski
2014-12-30 0:52 ` [PATCH 3.19 1/3] x86, mpx: Check user mode bitness correctly when decoding instructions Andy Lutomirski
2015-01-07 17:22 ` Dave Hansen
2015-01-12 22:48 ` Andy Lutomirski
2014-12-30 0:52 ` [PATCH 3.19 2/3] x86, mpx: Short-circuit the instruction decoder for unexpected opcodes Andy Lutomirski
2014-12-30 0:58 ` Andy Lutomirski
2014-12-30 0:52 ` [PATCH 3.19 3/3] x86, mpx: Change the MPX enable/disable API to arch_prctl Andy Lutomirski
2015-01-02 7:53 ` Dave Hansen
2015-01-05 20:42 ` Andi Kleen [this message]
2015-01-05 21:18 ` Dave Hansen
2015-01-05 23:04 ` Andy Lutomirski
2015-01-05 23:10 ` Dave Hansen
2015-01-05 23:22 ` Andy Lutomirski
2015-01-06 4:04 ` Andi Kleen
2015-01-06 5:59 ` Andy Lutomirski
2015-01-06 17:48 ` Dave Hansen
2015-01-06 18:06 ` Andy Lutomirski
2015-01-06 18:30 ` Dave Hansen
2015-01-06 18:41 ` Andy Lutomirski
2015-01-06 18:54 ` Dave Hansen
2015-01-06 19:16 ` Andi Kleen
2015-01-06 19:51 ` Andy Lutomirski
2015-01-06 21:22 ` Andi Kleen
2015-01-06 21:34 ` Andy Lutomirski
2015-01-06 21:39 ` Andi Kleen
2015-01-12 10:34 ` Enkovich, Ilya
2015-01-07 23:18 ` Dave Hansen
2015-01-07 23:24 ` Andy Lutomirski
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