linux-kernel - Re: [PATCH] anon_inodes: mark the anon inode private

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Date:	Wed, 10 Mar 2010 15:53:56 +1100 (EST)
From:	James Morris <jmorris@...ei.org>
To:	Eric Paris <eparis@...hat.com>
cc:	linux-kernel@...r.kernel.org, selinux@...ho.nsa.gov,
	torvalds@...ux-foundation.org, sds@...ho.nsa.gov,
	viro@...IV.linux.org.uk
Subject: Re: [PATCH] anon_inodes: mark the anon inode private

On Tue, 9 Mar 2010, Eric Paris wrote:

> Inotify was switched to use anon_inode instead of its own private filesystem
> which only had one inode in commit c44dcc56d2b5c7 "switch inotify_user to
> anon_inode"
> 
> The problem with this is that now the inotify inode is not a distinct inode
> which can be managed by LSMs.  userspace tools which use inotify were allowed
> to use the inotify inode but may not have had permission to do read/write type
> operations on the anon_inode.  After looking at the anon_inode and its users
> it looks like the best solution is to just mark the anon_inode as S_PRIVATE
> so the security system will ignore it.
> 
> Signed-off-by: Eric Paris <eparis@...hat.com>

Acked-by: James Morris <jmorris@...ei.org>

> ---
>  fs/anon_inodes.c |    1 +
>  1 files changed, 1 insertions(+), 0 deletions(-)
> 
> diff --git a/fs/anon_inodes.c b/fs/anon_inodes.c
> index 9f0bf13..2de0095 100644
> --- a/fs/anon_inodes.c
> +++ b/fs/anon_inodes.c
> @@ -209,6 +209,7 @@ static struct inode *anon_inode_mkinode(void)
>  	inode->i_mode = S_IRUSR | S_IWUSR;
>  	inode->i_uid = current_fsuid();
>  	inode->i_gid = current_fsgid();
> +	inode->i_flags |= S_PRIVATE;
>  	inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
>  	return inode;
>  }
> -- 
> 1.6.5.3
> 

-- 
James Morris
<jmorris@...ei.org>
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