From: Dave Hansen <dave.hansen@linux.intel.com> Date: Sun, 7 Jun 2015 18:37:06 +0000 (-0700) Subject: x86/mpx: Allow 32-bit binaries on 64-bit kernels again X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=97ac46a5087eaf87fd76ff7bb31ec9c896010442;p=linux.git 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> --- diff --git a/arch/x86/mm/mpx.c b/arch/x86/mm/mpx.c index 6233d5195f010..7a657f58bbea1 100644 --- a/arch/x86/mm/mpx.c +++ b/arch/x86/mm/mpx.c @@ -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.