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>
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@ -366,12 +366,6 @@ static __user void *mpx_get_bounds_dir(void)
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if (!cpu_feature_enabled(X86_FEATURE_MPX))
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return MPX_INVALID_BOUNDS_DIR;
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/*
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* 32-bit binaries on 64-bit kernels are currently
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* unsupported.
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*/
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if (IS_ENABLED(CONFIG_X86_64) && test_thread_flag(TIF_IA32))
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return MPX_INVALID_BOUNDS_DIR;
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/*
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* The bounds directory pointer is stored in a register
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* only accessible if we first do an xsave.
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