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These questions are about Linux in general -- NOT specific to a particular distribution. If the question just happens to be in a Linux environment, please specify your Linux distribution in the body of your question, but do NOT use the /linux tag.

1
vote
You can find out using cryptsetup luksDump /dev/sdXX. As far as I know dm-crypt is a kernel module for disk encryption while LUKS is a specific format. I am not aware of any other formats you can use …
answered May 18 '11 by stribika
10
votes
There is a system call named ptrace. It takes 4 parameters: the operation, the PID of the target process, an address in the target process memory, and a data pointer. The way the last 2 parameters are …
answered Feb 5 '11 by stribika
1
vote
You need patched kernel, losetup and mount. The package is usually called util-linux, you can get the patches from here. If you don't want to boot from a loop-aes device it's really simple: # Write …
answered Jul 26 '11 by stribika
3
votes
2answers
I want to collect statistics about who is using a computer and for how much time. I can use the users command to see who is logged in but I want to know who is on the currently active VT. I don't care …
asked Jul 24 '11 by stribika
3
votes
You need to set the proper kernel configuration options. Here is the relevant part of the documentation. I don't think you can do it from the gradm policy file.
answered Aug 17 '11 by stribika
2
votes
The simplest soulution is to create a backup of /srv. This is only 188MB it should fit in /srv.tar. tar cvf /srv.tar.bz2 --auto-compress /srv Then delete the sda4 partition and create 2 others. You …
answered Mar 10 '11 by stribika
2
votes
If you want to separate wireless and wired users why not match the interfaces? Assuming ppp0 is facing the internet, eth0 is your local LAN and wlan0 is the wireless: iptables -P FORWARD DROP …
answered Mar 5 '11 by stribika
4
votes
OpenVPN is designed to be secure. It will only allow clients who have the keys signed by you. The most important thing is keeping the private keys secure. Always encrypt them on the clients and check …
answered Mar 8 '11 by stribika
2
votes
Well your first link is about kernel mode arbitraty code execution there is not much you can do against that. Logging out won't help. Grsecurity and PaX could prevent this but I'm not sure. It surely …
answered Mar 8 '11 by stribika
7
votes
When you hibernate a computer all the memory (including all cryptographic keys) is written to the swap. I can't speak for all the Linux distributions and I am not familiar with OSX but Ubuntu uses …
answered Mar 20 '11 by stribika
19
votes
2answers
Some time ago I had a RAID5 system at home. One of the 4 disks failed but after removing and putting it back it seemed to be OK so I started a resync. When it finished I realized, to my horror, that 3 …
asked Mar 8 '11 by stribika
16
votes
I don't think you can do it in place but if you have enough space this should work: # Create the files that will hold your data dd if=/dev/zero of=part-00 bs=1M count=4k dd if=/dev/zero of=part-01 bs …
answered Jul 21 '11 by stribika