linux-ext4 - Re: [RFC v3 12/13] vfs: add debugfs support

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Mon, 15 Oct 2012 18:55:30 +1100
From:	Dave Chinner <david@...morbit.com>
To:	zwu.kernel@...il.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 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.

Cheers,

Dave.
-- 
Dave Chinner
david@...morbit.com
--
To unsubscribe from this list: send the line "unsubscribe linux-ext4" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html