s4eidhp’s gists

s4eidhp / rpi_pc_direct_ethernet.md

Created February 16, 2025 05:26

Connect your Raspberry Pi using the PC Ethernet Port using a straight Ethernet Cable
Modify Internet Connection Sharing (ICS) from another interface so that it shares internet connection with rpi connected interface

s4eidhp / rpi_bare_metal.md

Created December 27, 2024 13:32

install cross compiller

sudo apt install gcc-aarch64-linux-gnu

s4eidhp / esp32_bare_metal.md

Last active November 17, 2024 14:06

Install required packages

sudo apt-get install git wget flex bison gperf python3 python3-pip python3-venv cmake \
                     ninja-build ccache libffi-dev libssl-dev dfu-util libusb-1.0-0

Get esp-idf

git clone --recursive https://github.com/espressif/esp-idf.git

s4eidhp / lpi_notes.md

Last active November 9, 2024 11:17

Linux Programming Interface

CHAPTER 2

Kernel Tasks:
- Process Schedulling
- Memory Managment
- Provision of a file system
- Creation and termination of processes
- Access to devices
- Networking
Provision of a system call application programming interface (API)

s4eidhp / win_ssh_key_pair.md

Last active November 1, 2024 09:00

SSH into Windows using Key Authentication

Install OpenSSH Server on remote machine
Set OpenSSH Authentication Agent service & OpenSSH Server service to start automatically
Start both services
Edit C:\ProgramData\ssh\sshd_config file

PubKeyAuthentication      yes
PasswordAuthentication    no
# Match group admin ...
# Authorized key file ...

s4eidhp / build_minimal_img_rpi02w.md

Last active October 12, 2024 10:06

Toolchain

cd ~
git clone https://github.com/crosstool-ng/crosstool-ng.git  
cd crosstool-ng 
git checkout crosstool-ng-1.26.0        # currently latest stable version
./bootstrap
./configure --prefix=${PWD}
make
make install

s4eidhp / x64_assembly_linux.md

Last active October 16, 2024 13:35

Assembly Language and Shellcode for x86_64

Compilation process

hello.c -> hello.i -> hello.s -> hello.o + some other object files -> hello.exe

Findout CPU arch

lscpu

s4eidhp / gdb_notes.md

Created October 12, 2024 08:21

GNU Debugger Megaprimer

Find binary file info (if debug symbols exist)

info functions
info variables              # for global variables
info registers              # inspect CPU registers
info scope <scope_name>     # for local variables

s4eidhp / build_linux_kernel.md

Created October 12, 2024 08:18

How to build

install dependencies

sudo apt install build-essential libncurses-dev bison flex libssl-dev libelf-dev fakeroot dwarves

download latest kernel from kernel.org in tarball format and extract it

wget https://cdn.kernel.org/pub/linux/kernel/v6.x/linux-6.9.9.tar.xz
tar -xf linux-6.9.9.tar.xz
rm linux-6.9.9.tar.xz

s4eidhp / offline_package_installation.md

Last active October 12, 2024 08:47

How to install a package on a machine which does not have internet access?

Steps

download apt-offline .deb package file from https://packages.ubuntu.com and transfer it to offline machine
install apt-offline

sudo dpkg -i apt-offline_<version>_all.deb

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