Commit 97ac46a5 authored Jun 07, 2015 by Dave Hansen Committed by Ingo Molnar Jun 09, 2015

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@linux.intel.com>
Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Dave Hansen <dave@sr71.net>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/20150607183706.70277DAD@viggo.jf.intel.com

Signed-off-by: Ingo Molnar <mingo@kernel.org>

parent bea03c50

arch/x86/mm/mpx.c

+0 −6

Original line number	Diff line number	Diff line
		@@ -366,12 +366,6 @@ static __user void *mpx_get_bounds_dir(void)
		if (!cpu_feature_enabled(X86_FEATURE_MPX))
		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.