Re: [patch 1/2] [RFC] Simple tamper-proof device filesystem.

[Tetsuo Handa <penguin-kernel@i-love.sakura.ne.jp>]

Hello.

Serge E. Hallyn wrote:
> Nope, try
> 
>   touch /root/hda1
>   ls -l /root/hda1
>   mount --bind /dev/hda1 /root/hda1
>   ls -l /root/hda1

[root@sakura ~]# touch /root/hda1
[root@sakura ~]# ls -l /root/hda1
-rw-r--r-- 1 root root 0 Dec 18 12:04 /root/hda1
[root@sakura ~]# mount --bind /dev/hda1 /root/hda1
[root@sakura ~]# ls -l /root/hda1
brw-r----- 1 root disk 3, 1 Dec 18  2007 /root/hda1

Oh, surprising.
I didn't know mount() accepts non-directory for mount-point.
But I think this is not a mount operation
because I can't see the contents of /dev/hda1 through /root/hda1 .
Can I see the contents of /dev/hda1 through /root/hda1 ?


> Then it sounds like this filesystem is something Tomoyo can use.

I had / partition mounted for read-only so that the admin can't do
'mknod /root/hda1 b 3 1' in 2003, and I named it
"Security Advancement Know-how Upon Readonly Approach for Linux" or SAKURA Linux.
This filesystem (SYAORAN) is developed to make /dev writable and tamper-proof
when / partition is read-only or protected by MAC.
TOMOYO is a pathname-based MAC implementation, and
SAKURA and SYAORAN were merged into TOMOYO Linux. ;-)

Regards.
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