linux-kernel - Re: Bad ext3/nfs DoS bug

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Message-ID: <44C7A272.8030401@sandeen.net>
Date:	Wed, 26 Jul 2006 12:12:18 -0500
From:	Eric Sandeen <sandeen@...deen.net>
To:	Neil Brown <neilb@...e.de>
CC:	Andrew Morton <akpm@...l.org>, Theodore Tso <tytso@....edu>,
	jack@...e.cz, 20@...ingley.org, marcel@...tmann.org,
	linux-kernel@...r.kernel.org, sct@...hat.com, adilger@...sterfs.com
Subject: Re: Bad ext3/nfs DoS bug

> +EXPORT_SYMBOL_GPL(export_iget);
...
> +static struct dentry *ext3_get_dentry(struct super_block *sb, void *vobjp)
> +{
> +	__u32 *objp = vobjp;
> +	unsigned long ino = objp[0];
> +	__u32 generation = objp[1];
> +
> +	if (ino != EXT3_ROOT_INO && ino < EXT3_FIRST_INO(sb))
> +		return ERR_PTR(-ESTALE);
> +
> +	return export_iget(sb, ino, generation);
> +}

Hm, with this, ext3.ko has a new dependency on exportfs.ko.  Is that 
desirable/acceptable?
-Eric
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