linux-kernel - Re: [patch 2/2] hugetlb: add /dev/hugetlb char device

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Message-ID: <20070324074129.GB18408@infradead.org>
Date:	Sat, 24 Mar 2007 07:41:29 +0000
From:	Christoph Hellwig <hch@...radead.org>
To:	Ken Chen <kenchen@...gle.com>
Cc:	Adam Litke <agl@...ibm.com>,
	William Lee Irwin III <wli@...omorphy.com>,
	Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: Re: [patch 2/2] hugetlb: add /dev/hugetlb char device

> +int hugetlb_zero_setup(struct file *file, struct vm_area_struct *vma)
> +{
> +	file = hugetlb_file_setup(vma->vm_end - vma->vm_start, 0);
> +	if (IS_ERR(file))
> +		return PTR_ERR(file);
> +
> +	if (vma->vm_file)
> +		fput(vma->vm_file);
> +	vma->vm_file = file;
> +	return hugetlbfs_file_mmap(file, vma);
> +}

Setting vma->vm_file to something that is not the file we called mmap
on and even refers to a different inode seems rather dangerous.

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