linux-kernel - Re: [AppArmor 33/41] Add d_namespace_path() to obtain namespace relative pathnames

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Date:	Thu, 12 Apr 2007 11:49:24 +0100
From:	Al Viro <viro@....linux.org.uk>
To:	jjohansen@...e.de
Cc:	linux-kernel@...r.kernel.org,
	linux-security-module@...r.kernel.org,
	linux-fsdevel@...r.kernel.org, chrisw@...s-sol.org,
	Andreas Gruenbacher <agruen@...e.de>
Subject: Re: [AppArmor 33/41] Add d_namespace_path() to obtain namespace relative pathnames

> +char *d_namespace_path(struct dentry *dentry, struct vfsmount *vfsmnt,
> +		       char *buf, int buflen)
> +{
> +	char *res;
> +	struct vfsmount *rootmnt, *nsrootmnt;
> +	struct dentry *root;
> +
> +	read_lock(&current->fs->lock);
> +	rootmnt = mntget(current->fs->rootmnt);
> +	read_unlock(&current->fs->lock);
> +	spin_lock(&vfsmount_lock);
> +	nsrootmnt = mntget(rootmnt->mnt_ns->root);

... and when somebody does umount -l on your chroot jail, you get
NULL ->mnt_ns.  Oops...
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