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Date:	Mon, 5 Jan 2015 15:22:39 -0800
From:	Andy Lutomirski <>
To:	Dave Hansen <>
Cc:	Andi Kleen <>,
	"" <>,
	X86 ML <>, Thomas Gleixner <>
Subject: Re: [PATCH 3.19 3/3] x86, mpx: Change the MPX enable/disable API to arch_prctl

On Mon, Jan 5, 2015 at 3:10 PM, Dave Hansen <> wrote:
> On 01/05/2015 03:04 PM, Andy Lutomirski wrote:
>>> > Yeah, I'd _really_ prefer not to change it.  The code is in a gcc
>>> > branch, but is getting pulled in to the 5.0 release.  We've got
>>> > *absolutely* no shortage of prctl numbers.
>> We do, however, have a severe shortage of sanity in the prctl implementation.
>> Anyway, if it's actually a problem to change it, I have no real
>> problem keeping it, but I think we *really* need to validate the rest
>> of the arguments at the very least.
> Do you mean just adding a pair of
>         if (arg2 || arg3 || arg4 || arg5)
>                 return -EINVAL;
> checks?



> That's perfectly fine with me.  I'm happy to queue up a patch to do just
> that if that's what you're going for.

Andy Lutomirski
AMA Capital Management, LLC
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