linux-kernel - Re: [PATCH v7 07/10] x86, mpx: decode MPX instruction to get bound violation information

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Date:	Sun, 20 Jul 2014 23:07:59 -0700
From:	Andi Kleen <andi@...stfloor.org>
To:	Qiaowei Ren <qiaowei.ren@...el.com>
Cc:	"H. Peter Anvin" <hpa@...or.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	Dave Hansen <dave.hansen@...el.com>, x86@...nel.org,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [PATCH v7 07/10] x86, mpx: decode MPX instruction to get bound violation information

Qiaowei Ren <qiaowei.ren@...el.com> writes:
> +	 */
> +#ifdef CONFIG_X86_64
> +	insn->x86_64 = 1;
> +	insn->addr_bytes = 8;
> +#else
> +	insn->x86_64 = 0;
> +	insn->addr_bytes = 4;
> +#endif

How would that handle compat mode on a 64bit kernel?
Should likely look at the code segment instead of ifdef.
> +	/* Note: the upper 32 bits are ignored in 32-bit mode. */

Again correct for compat mode? I believe the upper bits 
are undefined.


-Andi
-- 
ak@...ux.intel.com -- Speaking for myself only
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