linux-kernel - Re: linux-next: Tree for Jan 20 -- Kernel panic

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Date:	Wed, 21 Jan 2015 21:54:37 +0000 (UTC)
From:	Paul Walmsley <paul@...an.com>
To:	Al Viro <viro@...IV.linux.org.uk>
cc:	Guenter Roeck <linux@...ck-us.net>,
	Sabrina Dubroca <sd@...asysnail.net>,
	Paul Moore <pmoore@...hat.com>,
	Stephen Rothwell <sfr@...b.auug.org.au>,
	linux-next@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-fsdevel@...r.kernel.org, linux-audit@...hat.com,
	Richard Guy Briggs <rgb@...hat.com>
Subject: Re: linux-next: Tree for Jan 20 -- Kernel panic - Unable to mount
 root fs

On Wed, 21 Jan 2015, Al Viro wrote:

> Folks, could you check if the following on top of linux-next fixes the problem?

Tested-by: Paul Walmsley <paul@...an.com> # Tegra124 Jetson TK1

> 
> diff --git a/fs/namei.c b/fs/namei.c
> index 323957f..cda89c3 100644
> --- a/fs/namei.c
> +++ b/fs/namei.c
> @@ -2056,13 +2056,22 @@ static int do_path_lookup(int dfd, const char *name,
>  /* does lookup, returns the object with parent locked */
>  struct dentry *kern_path_locked(const char *name, struct path *path)
>  {
> +	struct filename *filename = getname_kernel(name);
>  	struct nameidata nd;
>  	struct dentry *d;
> -	int err = do_path_lookup(AT_FDCWD, name, LOOKUP_PARENT, &nd);
> -	if (err)
> +	int err;
> +
> +	if (IS_ERR(filename))
> +		return ERR_CAST(filename);
> +
> +	err = filename_lookup(AT_FDCWD, filename, LOOKUP_PARENT, &nd);
> +	if (err) {
> +		putname(filename);
>  		return ERR_PTR(err);
> +	}
>  	if (nd.last_type != LAST_NORM) {
>  		path_put(&nd.path);
> +		putname(filename);
>  		return ERR_PTR(-EINVAL);
>  	}
>  	mutex_lock_nested(&nd.path.dentry->d_inode->i_mutex, I_MUTEX_PARENT);
> @@ -2070,9 +2079,11 @@ struct dentry *kern_path_locked(const char *name, struct path *path)
>  	if (IS_ERR(d)) {
>  		mutex_unlock(&nd.path.dentry->d_inode->i_mutex);
>  		path_put(&nd.path);
> +		putname(filename);
>  		return d;
>  	}
>  	*path = nd.path;
> +	putname(filename);
>  	return d;
>  }
>  
> @@ -3314,7 +3325,7 @@ struct file *do_file_open_root(struct dentry *dentry, struct vfsmount *mnt,
>  	return file;
>  }
>  
> -struct dentry *kern_path_create(int dfd, const char *pathname,
> +static struct dentry *filename_create(int dfd, struct filename *name,
>  				struct path *path, unsigned int lookup_flags)
>  {
>  	struct dentry *dentry = ERR_PTR(-EEXIST);
> @@ -3329,7 +3340,7 @@ struct dentry *kern_path_create(int dfd, const char *pathname,
>  	 */
>  	lookup_flags &= LOOKUP_REVAL;
>  
> -	error = do_path_lookup(dfd, pathname, LOOKUP_PARENT|lookup_flags, &nd);
> +	error = filename_lookup(dfd, name, LOOKUP_PARENT|lookup_flags, &nd);
>  	if (error)
>  		return ERR_PTR(error);
>  
> @@ -3383,6 +3394,19 @@ out:
>  	path_put(&nd.path);
>  	return dentry;
>  }
> +
> +struct dentry *kern_path_create(int dfd, const char *pathname,
> +				struct path *path, unsigned int lookup_flags)
> +{
> +	struct filename *filename = getname_kernel(pathname);
> +	struct dentry *res = ERR_CAST(filename);
> +
> +	if (!IS_ERR(filename)) {
> +		res = filename_create(dfd, filename, path, lookup_flags);
> +		putname(filename);
> +	}
> +	return res;
> +}
>  EXPORT_SYMBOL(kern_path_create);
>  
>  void done_path_create(struct path *path, struct dentry *dentry)
> @@ -3401,7 +3425,7 @@ struct dentry *user_path_create(int dfd, const char __user *pathname,
>  	struct dentry *res;
>  	if (IS_ERR(tmp))
>  		return ERR_CAST(tmp);
> -	res = kern_path_create(dfd, tmp->name, path, lookup_flags);
> +	res = filename_create(dfd, tmp, path, lookup_flags);
>  	putname(tmp);
>  	return res;
>  }
> --
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> 


- Paul
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