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about /dev/shm?

Subject: about /dev/shm?
Date: Sat, 15 Apr 2006 15:14:10 +0000
Hello, all.

As you know, /dev/shm is 1777 and attackers used to write his backdoors at that directory.
So I have saw the partition for some time and I can't see any creation of the files.
So I changed this permission to 755, and there was no problem.


1. What's the role of the /dev/shm?
  shm means shared memory?

2. Why this directory must be 1777?
Is there any problem when I change the permission to like 755?
Thanks in advance.


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