simonheb

Get a 5.12 Linux kernel with support for newer Intel hardware (e.g., Intel Iris Xe for Thinkpad X1 Titanium Yoga) on Ubuntu/Debian/Pop!_OS

Prologue: Do I need this?

I recently got a Thinkpad sporting an Intel® Core™ i5-1140G7 Processor 11. gen (1,80 GHz, Turbo Boost, 4 Cores, 8 Threads, 8 MB Cache with an Integrated Intel® Iris® Xe. Sadly graphics drivers did not work out-of-the-box and also not with the latets 5.12 kernel from xenmod. You can tell it's not working when graphics are slow, backlight adjustment buttons don't work and this is the output of inxi -G (you might need to sudo apt install inxi):

simon@pop-os:~$ inxi -G
Graphics:
  Device-1: Intel driver: N/A 
  Device-2: IMC Networks Integrated Camera type: USB driver: uvcvideo 
  Display: x11 server: X.Org 1.20.9 driver: fbdev unloaded: modesetting,vesa 
 resolution: 2256x1504~95Hz 

adwait1-g

1. Downloading and building the Linux kernel

1. Clone the github repository onto your local machine.

$ git clone https://github.com/torvalds/linux.git
$ cd linux

2. Configure the build

florianl

package main

import (
	"fmt"
	"net"
	"os"
	"time"

	bpf "github.com/iovisor/gobpf/bcc"
	"github.com/florianl/go-tc"

sbernard31

#define KBUILD_MODNAME "foo"
#include <uapi/linux/bpf.h>
#include <linux/bpf.h>
#include <linux/icmp.h>
#include <linux/if_ether.h>
#include <linux/if_vlan.h>
#include <linux/in.h>
#include <linux/ip.h>
#include <linux/tcp.h>
#include <linux/udp.h>

cecilemuller

How to create an HTTPS certificate for localhost domains

This focuses on generating the certificates for loading local virtual hosts hosted on your computer, for development only.

Do not use self-signed certificates in production ! For online certificates, use Let's Encrypt instead (tutorial).

mcastelino

The netfilter hooks in the kernel and where they hook in the packet flow

The figure below calls out

• The netfilter hooks
• The order of table traversal

cpuspellcaster

Stream details:

When using the TTY setting is enabled in POST, the stream is the raw data from the process PTY and client’s stdin. When the TTY is disabled, then the stream is multiplexed to separate stdout and stderr.

The format is a Header and a Payload (frame).

HEADER

The header contains the information which the stream writes (stdout or stderr). It also contains the size of the associated frame encoded in the last four bytes (uint32).

aliuygur

this algorithm 10x faster than https://www.dotnetperls.com/duplicates-go and zero allocation

➜  api git:(master) ✗ go test -v -bench=. main_test.go
=== RUN   TestSliceUniq
--- PASS: TestSliceUniq (0.00s)
BenchmarkSliceUniq-4             3000000               439 ns/op               0 B/op          0 allocs/op
BenchmarkRemoveDuplicates-4       500000              4599 ns/op             571 B/op          8 allocs/op
PASS

MrTrustor

#!/bin/bash

# Copyright 2017 Théo Chamley
# Permission is hereby granted, free of charge, to any person obtaining a copy of 
# this software and associated documentation files (the "Software"), to deal in the Software
# without restriction, including without limitation the rights to use, copy, modify, merge,
# publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons
# to whom the Software is furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in all copies or

CMCDragonkai

Understanding the Memory Layout of Linux Executables

Required tools for playing around with memory:

• hexdump
• objdump
• readelf
• xxd
• gcore