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

Thomas Gleixner
2015-05-18T21:55:37Z

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@linux.intel.com>

Reviewed-by: Thomas Gleixner <tglx@linutronix.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.
> */
> _
>