Re: [PATCH 1/4] vfs: adds the S_PRIVATE flag and adds use to security

[Jeff Mahoney]

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Jeffrey Mahoney wrote:
> This patch adds an S_PRIVATE flag to inode->i_flags to mark an inode as
> filesystem-internal. As such, it should be excepted from the security
> infrastructure to allow the filesystem to perform its own access control.

> @@ -1459,12 +1469,16 @@ static inline void security_inode_post_l
>  					     struct inode *dir,
>  					     struct dentry *new_dentry)
>  {
> +	if (unlikely (IS_PRIVATE (new_dentry->d_inode)))
> +		return;
>  	security_ops->inode_post_link (old_dentry, dir, new_dentry);
>  }
>  

Internal testing has shown that this operation will cause an Oops on
NFS. The assumption that a link operation will return an instantiated
dentry is invalid, and thus new_dentry->d_inode will be NULL on NFS
filesystems. I'll send out a revised version later this evening.

- -Jeff

- --
Jeff Mahoney
SuSE Labs
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