linux-kernel - [PATCH 16/17] x86, mpx: allow mixed binaries again

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Message-Id: <20150422182750.9FBA5EF6@viggo.jf.intel.com>
Date:	Wed, 22 Apr 2015 11:27:50 -0700
From:	Dave Hansen <dave@...1.net>
To:	linux-kernel@...r.kernel.org
Cc:	x86@...nel.org, tglx@...utronix.de, Dave Hansen <dave@...1.net>,
	dave.hansen@...ux.intel.com
Subject: [PATCH 16/17] x86, mpx: allow mixed binaries again


From: Dave Hansen <dave.hansen@...ux.intel.com>

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>
---

 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	2015-04-22 11:16:23.832073480 -0700
+++ b/arch/x86/mm/mpx.c	2015-04-22 11:16:23.836073661 -0700
@@ -370,12 +370,6 @@ static __user void *task_get_bounds_dir(
 		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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