linux-kernel - Re: [PATCH 29/47] Update CRISv32 traps.c

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Date:	Wed, 12 Dec 2007 03:21:24 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Jesper Nilsson <jesper.nilsson@...s.com>
Cc:	Mikael Starvik <mikael.starvik@...s.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 29/47] Update CRISv32 traps.c

On Fri, 30 Nov 2007 16:22:50 +0100 Jesper Nilsson <jesper.nilsson@...s.com> wrote:

> +#ifdef CONFIG_DEBUG_BUGVERBOSE
> +void
> +handle_BUG(struct pt_regs *regs)
>  {
> -  asm volatile("setf m");
> +	struct bug_frame f;
> +	unsigned char c;
> +	unsigned long irp = regs->irp;
> +
> +	if (__copy_from_user(&f, (const void __user *)(irp - 8), sizeof f))
> +		return;
> +	if (f.prefix != BUG_PREFIX || f.magic != BUG_MAGIC)
> +		return;
> +	if (__get_user(c, f.filename))
> +		f.filename = "<bad filename>";
> +
> +	printk("kernel BUG at %s:%d!\n", f.filename, f.line);
>  }
> +#endif

Why is it accessing user memory in the BUG handler?
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