linux-kernel - Re: [PATCH 19/19] x86, mpx: allow mixed binaries again

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Message-ID: <alpine.DEB.2.11.1505182355330.4225@nanos>
Date:	Mon, 18 May 2015 23:55:44 +0200 (CEST)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Dave Hansen <dave@...1.net>
cc:	linux-kernel@...r.kernel.org, x86@...nel.org,
	dave.hansen@...ux.intel.com
Subject: Re: [PATCH 19/19] x86, mpx: allow mixed binaries again

On Fri, 8 May 2015, Dave Hansen wrote:
> We explicitly disable allowing 32-bit binaries to enable
> MPX on 64-bit kernels.  Re-allow that.
> 
> Signed-off-by: Dave Hansen <dave.hansen@...ux.intel.com>

Reviewed-by: Thomas Gleixner <tglx@...utronix.de>

> ---
> 
>  b/arch/x86/mm/mpx.c |    6 ------
>  1 file changed, 6 deletions(-)
> 
> diff -puN arch/x86/mm/mpx.c~x86-mpx-allow-mixed-binaries-again arch/x86/mm/mpx.c
> --- a/arch/x86/mm/mpx.c~x86-mpx-allow-mixed-binaries-again	2015-05-08 11:46:23.253134695 -0700
> +++ b/arch/x86/mm/mpx.c	2015-05-08 11:46:23.256134830 -0700
> @@ -368,12 +368,6 @@ static __user void *mpx_get_bounds_dir(v
>  		return MPX_INVALID_BOUNDS_DIR;
>  
>  	/*
> -	 * 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;
> -	/*
>  	 * The bounds directory pointer is stored in a register
>  	 * only accessible if we first do an xsave.
>  	 */
> _
> 
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