linux-kernel - [tip:x86/fpu] x86/mpx: Allow 32-bit binaries on 64-bit kernels again

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Message-ID: <tip-97ac46a5087eaf87fd76ff7bb31ec9c896010442@git.kernel.org>
Date:	Tue, 9 Jun 2015 05:36:17 -0700
From:	tip-bot for Dave Hansen <tipbot@...or.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	peterz@...radead.org, mingo@...nel.org, dave@...1.net,
	akpm@...ux-foundation.org, torvalds@...ux-foundation.org,
	hpa@...or.com, linux-kernel@...r.kernel.org,
	dave.hansen@...ux.intel.com, tglx@...utronix.de
Subject: [tip:x86/fpu] x86/mpx:
  Allow 32-bit binaries on 64-bit kernels again

Commit-ID:  97ac46a5087eaf87fd76ff7bb31ec9c896010442
Gitweb:     http://git.kernel.org/tip/97ac46a5087eaf87fd76ff7bb31ec9c896010442
Author:     Dave Hansen <dave.hansen@...ux.intel.com>
AuthorDate: Sun, 7 Jun 2015 11:37:06 -0700
Committer:  Ingo Molnar <mingo@...nel.org>
CommitDate: Tue, 9 Jun 2015 12:24:34 +0200

x86/mpx: Allow 32-bit binaries on 64-bit kernels again

Now that the bugs in mixed mode MPX handling are fixed, re-allow
32-bit binaries on 64-bit kernels again.

Signed-off-by: Dave Hansen <dave.hansen@...ux.intel.com>
Reviewed-by: Thomas Gleixner <tglx@...utronix.de>
Cc: Andrew Morton <akpm@...ux-foundation.org>
Cc: Dave Hansen <dave@...1.net>
Cc: H. Peter Anvin <hpa@...or.com>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Peter Zijlstra <peterz@...radead.org>
Link: http://lkml.kernel.org/r/20150607183706.70277DAD@viggo.jf.intel.com
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 arch/x86/mm/mpx.c | 6 ------
 1 file changed, 6 deletions(-)

diff --git a/arch/x86/mm/mpx.c b/arch/x86/mm/mpx.c
index 6233d51..7a657f5 100644
--- a/arch/x86/mm/mpx.c
+++ b/arch/x86/mm/mpx.c
@@ -367,12 +367,6 @@ static __user void *mpx_get_bounds_dir(void)
 		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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