surreal wrote:
I just caught hold of a C source code from 2005. This code is a local
DoS which fills up the entire memory on Linux 2.6.N kernels.
At that time, I used Fedora Core 4 and a pentium 4 machine with 512 MB
ram. After compiling and running this program on the old machine, it
used to hang within 40 seconds.
I compiled and ran this program on a test machine having Dual Core
CPU, 2 GB ram and Debian Lenny to see if this code holds good today.
I saw that RAM wasent running out, but the CPU usage was 100%. I didnt
wait for computer to hang, but I think this code is dangerous and can
be used for malicious intentions.
I am sending the code so that we can prevent bad use of it. It still
has potential of a local DoS. I hope kernel hackers might get
interested in this.
This code isent tested on AMD 64 bit kernel, but on a 2.6.26 stable
kernel.
The C code is attached with this mail.
800df127fbcb5552a455b6742b62bfe0 mseak.c
Just gcc mseak.c -o mseak; mseak & to see the effects.
--
Harshad Joshi
Tested it on my amd64 machine running latest git, but except for the CPU
going at 100%, nothing else happens.
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