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@Prakasaka
Prakasaka / bash-colors.md
Created July 25, 2020 09:14 — forked from JBlond/bash-colors.md
The entire table of ANSI color codes.

Regular Colors

Value Color
\e[0;30m Black
\e[0;31m Red
\e[0;32m Green
\e[0;33m Yellow
\e[0;34m Blue
\e[0;35m Purple
@icecr4ck
icecr4ck / idapython_cheatsheet.md
Last active April 23, 2024 18:45
Cheatsheet for IDAPython
@dlaehnemann
dlaehnemann / flamegraph_rust.md
Last active February 14, 2024 14:14
flamegraphing rust binaries' cpu usage with perf
@zznop
zznop / mem-loader.asm
Last active March 6, 2023 00:17
Fun little loader shellcode that executes an ELF in-memory using an anonymous file descriptor (inspired by https://x-c3ll.github.io/posts/fileless-memfd_create/)
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;;
;;; Copyright (C), zznop, brandonkmiller@protonmail.com
;;;
;;; This software may be modified and distributed under the terms
;;; of the MIT license. See the LICENSE file for details.
;;;
;;; DESCRIPTION
;;;
;;; This PoC shellcode is meant to be compiled as a blob and prepended to a ELF
@mcastelino
mcastelino / acpi_qemu_pci_hotplug.md
Last active January 24, 2023 23:50
APCI QEMU PCI Discovery, Enumeration and Hotplug

Overview

This document attempts to call out all the elements and mechanisms involved in the discovery as well as hotplug of PCI devices including

  • QEMU framework
  • APCI Tables and Methods
  • Linux Kernel functions and tables

The logic pertaining to the GED interrupt based APCI eventing is specific to NEMU. The rest of this document is generic.

QEMU Hotplug Registration

@DhavalKapil
DhavalKapil / ELF-symbol-resolution.md
Created April 25, 2018 03:30

ELF

ELF Header

The first portion of any ELF file is the ELF header. This generally provides offsets to other headers (program headers and section headers) within an ELF.

typedef struct {
  unsigned char e_ident[EI_NIDENT];
 uint16_t e_type;
@PollenPolle
PollenPolle / gist:ada4d123a4579f3e22f2c5e30e6f4a02
Last active July 18, 2023 07:15
Raw sockets in Go
/*
Copyright (c) 2016, Nitin Gode
All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:
* Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
* Redistributions in binary form must reproduce the above copyright
notice, this list of conditions and the following disclaimer in the
@CMCDragonkai
CMCDragonkai / memory_layout.md
Last active May 9, 2024 14:12
Linux: Understanding the Memory Layout of Linux Executables

Understanding the Memory Layout of Linux Executables

Required tools for playing around with memory:

  • hexdump
  • objdump
  • readelf
  • xxd
  • gcore
@jboner
jboner / latency.txt
Last active June 1, 2024 18:05
Latency Numbers Every Programmer Should Know
Latency Comparison Numbers (~2012)
----------------------------------
L1 cache reference 0.5 ns
Branch mispredict 5 ns
L2 cache reference 7 ns 14x L1 cache
Mutex lock/unlock 25 ns
Main memory reference 100 ns 20x L2 cache, 200x L1 cache
Compress 1K bytes with Zippy 3,000 ns 3 us
Send 1K bytes over 1 Gbps network 10,000 ns 10 us
Read 4K randomly from SSD* 150,000 ns 150 us ~1GB/sec SSD