linux-kernel - Re: [PATCH v6 08/10] x86, mpx: add prctl commands PR_MPX_REGISTER, PR_MPX

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Message-ID: <53A34EFC.5070809@intel.com>
Date:	Thu, 19 Jun 2014 13:58:36 -0700
From:	Dave Hansen <dave.hansen@...el.com>
To:	Qiaowei Ren <qiaowei.ren@...el.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>
CC:	x86@...nel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v6 08/10] x86, mpx: add prctl commands PR_MPX_REGISTER,
 PR_MPX_UNREGISTER

On 06/18/2014 02:44 AM, Qiaowei Ren wrote:
> +static __user void *task_get_bounds_dir(struct task_struct *tsk)
> +{
> +	struct xsave_struct *xsave_buf;
> +
> +	fpu_xsave(&tsk->thread.fpu);
> +	xsave_buf = &(tsk->thread.fpu.state->xsave);
> +	if (!(xsave_buf->bndcsr.cfg_reg_u & MPX_BNDCFG_ENABLE_FLAG))
> +		return NULL;
> +
> +	return (void __user *)(xsave_buf->bndcsr.cfg_reg_u &
> +			MPX_BNDCFG_ADDR_MASK);
> +}

This spits out a warning on 32-bit:

arch/x86/kernel/mpx.c: In function ‘task_get_bounds_dir’:
arch/x86/kernel/mpx.c:21:9: warning: cast to pointer from integer of
different size [-Wint-to-pointer-cast]



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