linux-kernel - Re: [RFC v3 12/13] vfs: add debugfs support

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Message-ID: <CAEH94LimWEzB1=eBQ8WAOXqvOY17o4AJQHCNYXTL0h4Vafsfdg@mail.gmail.com>
Date:	Mon, 15 Oct 2012 16:15:58 +0800
From:	Zhi Yong Wu <zwu.kernel@...il.com>
To:	Dave Chinner <david@...morbit.com>
Cc:	linux-fsdevel@...r.kernel.org, linux-ext4@...r.kernel.org,
	linux-btrfs@...r.kernel.org, linux-kernel@...r.kernel.org,
	linuxram@...ux.vnet.ibm.com, viro@...iv.linux.org.uk,
	dave@...os.cz, tytso@....edu, cmm@...ibm.com,
	Zhi Yong Wu <wuzhy@...ux.vnet.ibm.com>
Subject: Re: [RFC v3 12/13] vfs: add debugfs support

On Mon, Oct 15, 2012 at 3:55 PM, Dave Chinner <david@...morbit.com> wrote:
> On Wed, Oct 10, 2012 at 06:07:34PM +0800, zwu.kernel@...il.com wrote:
>> From: Zhi Yong Wu <wuzhy@...ux.vnet.ibm.com>
>>
>>   Add a /sys/kernel/debug/hot_track/<device_name>/ directory for each
>> volume that contains two files. The first, `inode_data', contains the
>> heat information for inodes that have been brought into the hot data map
>> structures. The second, `range_data', contains similar information for
>> subfile ranges.
> ....
>> +     /* create debugfs range_data file */
>> +     debugfs_range_entry = debugfs_create_file("range_data",
>> +                             S_IFREG | S_IRUSR | S_IWUSR | S_IRUGO,
>> +                             debugfs_volume_entry,
>> +                             (void *) range_data,
>> +                             &hot_debugfs_range_fops);
>
> These should not be world readable. 0600 is probably the correct
> permissions for them as we do not want random users to be able to
> infer what files users are accessing from this information.
Good catch, its mode should be S_IFREG | S_IRUSR | S_IWUSR

>
> Cheers,
>
> Dave.
> --
> Dave Chinner
> david@...morbit.com



-- 
Regards,

Zhi Yong Wu
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