Re: about /dev/shm?



Monty Ree wrote:
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?


You'll lose Posix shared memory is all. Perhaps changing the mount to a
noexec,nosuid,nodev mount makes
more sense, without breaking anything.

Anything using shmget should be ok.

--Thomas.