omerfdemir / virtualtophysical

Kernel Module to translate given virtual address with process id to physicall address

Kernel Module to translate given virtual address with process id to physical address

Instructions

Downloading and extracting Kernel

Downloading Kernel

linux-kernel-4.9.40 or use wget https://cdn.kernel.org/pub/linux/kernel/v4.x/linux-4.9.40.tar.xz and after extract it.

Extracting

tar -xvf linux-4.9.40.tar.xz

Running scripts

Copy this(virtualtophysical) folder to same directory which linux-4.9.40 is in.

Run copy_files.sh to copy necessary kernel config files

./copy_files.sh

Run compile_kernel.sh with root privilege to start compiling kernel

sudo ./compile_kernel.sh In order to compile linux kernel config file must created. We are creating config file with default values. Follow the following steps. After doing that compiling script will continue. It can take 30+ minutes based on computer specifications.

After compiling kernel reboot the machine with reboot command.

Check your new kernel version with uname -r command. ##Testing Run allocate_memory script by typing ./allocate_memory.sh command. It allocates memory and return virtual address and physical address.

To check physical address of other process we need to know process id and virtual address of that process.

Check the id of testscript with typing ps -aux | grep allocate_memory.o

Run trysyscall script by typing ./trysyscall.sh pid virtual_address Where pid is result of ps -aux | grep allocate_memory.o and virtual_address is printed value after running ./allocate_memory.sh script.

By doing that we can reach physical value of a process within another process with process id and virtual address of that process.