Sebastian Wicki gandro

## ble_frame_collisions.md

      
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                utaal
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                BLE advertisement frame successful exchange rate in scenarios with many advertising devices
              
          
    This is based on my partial knowledge of radio networks, and on very incomplete knowledge of the BLE stack.
AFAIK BLE scans in short intervals on one of 3 channels. With >50 devices in advertisement mode it may be hard to get non-colliding frames to the receiver.

I don’t think Bluetooth LE was designed to have hundreds of devices in discoverable mode sending out garbage identity frames.
Increasing the radio wake time may not be a solution either because you end up with flat batteries too quickly.

Protocol

3 advertising channels;


## Hyperlinks_in_Terminal_Emulators.md

      
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                egmontkob
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                Hyperlinks in Terminal Emulators
              
          
    Hyperlinks (a.k.a. HTML-like anchors) in terminal emulators

[ Update 2020-05-31: I won't be maintaining this page or responding to comments anymore (except for perhaps a few exceptional occasions). ]

Most of the terminal emulators auto-detect when a URL appears onscreen and allow to conveniently open them (e.g. via Ctrl+click or Cmd+click, or the right click menu).
It was, however, not possible until now for arbitrary text to point to URLs, just as on webpages.

  
## arm64.md

      
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                george-hawkins
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                Running virtualized x86_64 and emulated arm64 Ubuntu cloud images using QEMU
              
          
    QEMU arm64 cloud server emulation

This is basically a rehash of an original post on CNXSoft - all credit (particularly for the Virtio device arguments used below) belongs to the author of that piece.
Download the latest uefi1.img image. E.g. ubuntu-16.04-server-cloudimg-arm64-uefi1.img from https://cloud-images.ubuntu.com/releases/16.04/release/
Download the UEFI firmware image QEMU_EFI.fd from https://releases.linaro.org/components/kernel/uefi-linaro/latest/release/qemu64/
Determine your current username and get your current ssh public key:

  
## 17503-eliminate-rescan.md

      
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                aclements
                / 17503-eliminate-rescan.md
            
            
              Created
              October 18, 2016 20:04
            
              
                Preview of proposal go/golang#17503
              
          
    Proposal: Eliminate STW stack re-scanning

Author(s): Austin Clements, Rick Hudson
Last updated: 2016-10-18
Discussion at https://golang.org/issue/17503.
Abstract


## types.markdown

      
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                garybernhardt
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    This document has moved!

It's now here, in The Programmer's Compendium.
The content is the same as before, but being part of the compendium means that it's actively maintained.

  
## rust-cross-libs.sh
#!/bin/bash

# THIS IS A GIANT HACK
# if you think this would be a good idea if it weren't so terrible, go read https://github.com/rust-lang/rfcs/pull/1133

set -e

# Parse args
for i in "$@"
do

## BootChess.asm
;----------RED-SECTOR-INC.-proudly-presents-a-33-year-old-record-:----------
; 468-byte footprint___ _       "...The original chess game in a bootsector"
;                  /     /         _____ _ _      _____ _ _        ___ _
;     .::.        /     /         /     /  /     /     /  /       /     /
;     ::::       /     / ____  .-/   _ ___/-. .-/   _ ___/-.     /     /__
;      ::       /            \ |    |  .    | |    |  .    |    /        /
;      ::            __ _     \     l  |    | |    l  |    |   /     ___/
;     .::.    /     /   /     /     |  l    |_|    l  |    |__/     / ____
;    .::::.        / __/            `--'           `--'            /      |
;   ::::::::                /                               /             |

## area14_2014_challenge_writeup.md

      
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                brb
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                area41 2014 challenge writeup
              
          
    Intro

Being a cheapass student, I couldn't resist to try to win a free entrance to
[Area41 Security Conference][3] (don't mix with Alcoholics Anonymous Area 41
in Nebraska) after spotting @gandro23 retweet about the conference and
the challenge.
Level 01

The challenge starts after downloading and extracting a [binary][1]. A quick look

  
## rapidshare.sh
#!/bin/bash
# Version 4.1.0
#
# "THE COFFEE-WARE LICENSE" (Revision 12/2007):
#
# Sebastian Wicki <gandro@gmx.net> wrote this file. As long as you retain
# this notice you can do whatever you want with this stuff. If we meet some
# day, and you think this stuff is worth it, you can buy me a cup of coffee
# in return.
#
	#!/bin/bash

	# THIS IS A GIANT HACK
	# if you think this would be a good idea if it weren't so terrible, go read https://github.com/rust-lang/rfcs/pull/1133

	set -e

	# Parse args
	for i in "$@"
	do
	;----------RED-SECTOR-INC.-proudly-presents-a-33-year-old-record-:----------
	; 468-byte footprint___ _ "...The original chess game in a bootsector"
	; / / _____ _ _ _____ _ _ ___ _
	; .::. / / / / / / / / / /
	; :::: / / ____ .-/ _ ___/-. .-/ _ ___/-. / /__
	; :: / \ \| \| . \| \| \| . \| / /
	; :: __ _ \ l \| \| \| l \| \| / ___/
	; .::. / / / / \| l \|_\| l \| \|__/ / ____
	; .::::. / __/ `--' `--' / \|
	; :::::::: / / \|
	#!/bin/bash
	# Version 4.1.0
	#
	# "THE COFFEE-WARE LICENSE" (Revision 12/2007):
	#
	# Sebastian Wicki <gandro@gmx.net> wrote this file. As long as you retain
	# this notice you can do whatever you want with this stuff. If we meet some
	# day, and you think this stuff is worth it, you can buy me a cup of coffee
	# in return.
	#