Every system I've seen has the /build symlink but not the /source symlink.
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|README||Simplified module to use sysfs instead of debugfs|
|nullderef.c||Simplified module to use sysfs instead of debugfs|
NULLDEREF -- A module for playing with kernel NULL pointer dereferences BUILDING This module should build against any remotely recent 2.6 kernel. To build, you'll need the kernel headers for your kernel installed. On Debian or Ubuntu, try: # apt-get install linux-headers-$(uname -r) on Fedora, try: # yum install kernel-devel Once you've got those, just run 'make' to produce a 'nullderef.ko' file. USING nullderef uses sysfs to export its hooks. Simply # insmod nullderef.ko You shuld now have a /sys/module/nullderef/parameters/ directory, containing two files, "read", and "call". Reading from either of these files will result in a NULL pointer dereference in the kernel. "read" will simply try to read a NULL pointer. "call" will read a function pointer from the NULL address, and then attempt to call through the resulting pointer. Once you're done crashing your kernel, if your machine is still stable, you can remove the module using: # rmmod nullderef