0 issue "letsencrypt.org" 0 issuewild "letsencrypt.org" 0 iodef "mailto:yourmail@example.jp" §OS再インストール 初期設定で期待通りの設定ができていない場合は、OSの再インストールをする。 さくらVPSのコントロールパネルから、OSを再インストールするサーバを選ぶ。 www99999ui.vs.sakura.ne.jp §OSのインストール操作 Ubuntu 24.04 LTS を選ぶ。 OSインストール時のパケットフィルタ（ポート制限）を無効にして、ファイアウォールは手動で設定することにする。 初期ユーザのパスワードに使える文字が制限されているので、ここでは簡単なパスワードにしておき、後ですぐに複雑なパスワードに変更する。 公開鍵認証できるように公開鍵を登録しておく。 §秘密鍵と公開鍵の作成 ク
関数名、メソッド名、変数名でよく使う英単語のまとめ
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防衛省サイバーコンテスト 2025 writeup - st98 の日記帳 - コピー
2/2に12時間というちょうどよい競技時間で開催された。21時終了だったけれども、11時45分ぐらいに最速で全完して1位🎉 第1回以来4年ぶりの優勝だ。昨年大会の第4回ではヒントの閲覧数で優勝を逃してしまって悔しい思いをしたので、雪辱を果たすことができ嬉しい。開始直後からずっと1位を独走できており、510名のプレイヤーがいる中で圧勝だったのも嬉しい。 昨年度や一昨年度はバルクが作問を担当していたが、今回はAGESTが担当していた。これまでの問題と比較すると全体的に易化したように思うが、解くにあたって発想の大きな飛躍を必要とするいわゆる「エスパー要素」のある問題はごく一部を除いて存在しておらず*1、よかったと思う。また、昨年度・一昨年度に引き続きwriteupは公開可能というのもよかった。 戦略というほどの戦略は立てていなかったけれども、とりあえずWebを見た後は全カテゴリを上から見ていき
Content-Disposition の filename という地雷。 (1個の観点で17個の脆弱性を見つけた話) - ぶるーたるごぶりん
English ver: https://gist.github.com/motoyasu-saburi/1b19ef18e96776fe90ba1b9f910fa714#file-lack_escape_content-disposition_filename-md TL;DR 1つのブラウザ、1つのプログラミング言語、15個の { Web Framework, HTTP Client ライブラリ, Email ライブラリ / Web Service 等} で脆弱性を見つけました。 見つけた脆弱性は、全て 1つの観点で発見した (多分 50-80 くらいのプロダクトの調査をした)。 RFC の記載では、（かなりわかりにくく）この問題に対する要件が記載されており、WHATWG > HTML Spec の方はしっかりと書かれているといった状況にある。 この問題は、 Content-Dispo
Just make it scale: An Aurora DSQL storyMay 27, 2025 • 3404 words At re:Invent we announced Aurora DSQL, and since then I’ve had many conversations with builders about what this means for database engineering. What’s particularly interesting isn’t just the technology itself, but the journey that got us here. I’ve been wanting to dive deeper into this story, to share not just the what, but the how
Assessing Claude Mythos Preview’s cybersecurity capabilities April 7, 2026 Nicholas Carlini, Newton Cheng, Keane Lucas, Michael Moore, Milad Nasr, Vinay Prabhushankar, Winnie Xiao Hakeem Angulu, Evyatar Ben Asher, Jackie Bow, Keir Bradwell, Ben Buchanan, David Forsythe, Daniel Freeman, Alex Gaynor, Xinyang Ge, Logan Graham, Kyla Guru, Hasnain Lakhani, Matt McNiece, Mojtaba Mehrara, Renee Nichol, A
缶つぶし機とソフトウェア移行技術 - Refactoring to Rust の読書感想文 - じゃあ、おうちで学べる
はじめに ——あるいは、「知っている」と「理解している」の間 Rustのことは、知っていた。学習もしていた。実務でも使っていた。 でも、それは知っているつもりだった。 知ってるつもり 無知の科学 (ハヤカワ文庫NF) 作者:スティーブン スローマン,フィリップ ファーンバック早川書房Amazon 日々Rustで開発し、BoxとRcとArcを使い分け、tokio::spawnでタスクを生成し、?演算子を当たり前のように書いている。FFI？PyO3使えばいいでしょ。WebAssembly？wasm-bindgenがあるじゃない。技術的には、確かに「使える」レベルにはあった。 でも、心のどこかで感じていた違和感があった。 オートバイのエンジンを分解できる人と、エンジンが動く原理を理解している人は違う。コードが動くことと、なぜそう書くべきかを理解することも違う。私は前者だった。メカニックではあった
TL;DR; We are changing std::sort in LLVM’s libcxx. That’s a long story of what it took us to get there and all possible consequences, bugs you might encounter with examples from open source. We provide some benchmarks, perspective, why we did this in the first place and what it cost us with exciting ideas from Hyrum’s Law to reinforcement learning. All changes went into open source and thus I can
Parsing SQL - Strumenta
The code for this tutorial is on GitHub: parsing-sql SQL is a language to handle data in a relational database. If you worked with data you have probably worked with SQL. In this article we will talk about parsing SQL. It is in the same league of HTML: maybe you never learned it formally but you kind of know how to use it. That is great because if you know SQL, you know how to handle data. However
Over the course of my Spring 2020 semester at Harvey Mudd College, I developed a self-hosting compiler entirely from scratch. This article walks through many interesting parts of the project. It’s laid out so you can just read from beginning to end, but if you’re more interested in a particular topic, feel free to jump there. Or, take a look at the project on GitHub. Table of contents What the pro
A Walk with LuaJIT
The following is a chronicle of implementing a general purpose zero-instrumentation BPF based profiler for LuaJIT. Some assumptions are made about what this entails and it may be helpful to read some of our other work in this area. One major change from prior efforts is that instead of working with the original Parca unwinder we are now working with the OpenTelemetry eBPF profiler. If you missed t
Introducing JavaScript support in MySQL - The Oracle MySQL Blog
MySQL continues to gear up innovations and now includes rich procedural programming capabilities inside the database. Developers can now write JavaScript stored programs (functions and procedures) in the MySQL database server. The stored programs will be run with the GraalVM run time. This is available as a Preview in MySQL Enterprise Edition and can be downloaded via Oracle Technology Network (OT
Some other notable examples: Improved SIMD comparisons. dotnet/runtime#104944 and dotnet/runtime#104215 improve how vector comparisons are handled. Improved ConditionalSelects. dotnet/runtime#104092 from @ezhevita improves the generated code for ConditionalSelects when the condition is a set of constants. Better Const Handling. Certain operations are only optimized when one of their arguments is a
とほほのKotlin入門 - とほほのWWW入門
概要 Kotlinとは Kotlinを試してみる インストール Hello world 基本的な覚え事 コマンド引数 print, println コメント 行末のセミコロン コーディング規約 キーワード 変数 型 真偽値(Boolean) 数値(Byte, Short, Int, Long, Float, Double) 文字(Char) 文字列(String) Any型(Any) 型変換 配列 リスト セット マップ レンジ(range) 型を確認する(is, !is) 型の別名(typealias) キャスト(as, as?) ダイナミック型(dynamic) 演算子 制御構文 if式 fotループ forEachループ whileループ do-whileループ break文 continue文 when式 ラベル(@) 例外処理(try, throw, catch, finally
"},"dump":{"kind":"string","value":"CC-MAIN-2013-20"},"url":{"kind":"string","value":"http://%20jwashington@ap.org/Content/Press-Release/2012/How-AP-reported-in-all-formats-from-tornado-stricken-regions"},"date":{"kind":"string","value":"2013-05-18T05:48:54Z"},"file_path":{"kind":"string","value":"s3://commoncrawl/crawl-data/CC-MAIN-2013-20/segments/1368696381249/warc/CC-MAIN-20130516092621-00000-
Try Mastering Emacs for free! Are you struggling with the basics? Have you mastered movement and editing yet? When you have read Mastering Emacs you will understand Emacs. It’s that time again: there’s a new major version of Emacs and, with it, a treasure trove of new features and changes. Notable features include the formal inclusion of native compilation, a technique that will greatly speed up y
Rust for Secure IoT Applications: Why C Is Getting Rusty
www.embedded-world.eu Rust for Secure IoT Applications Why C Is Getting Rusty Mario Noseda, Fabian Frei, Andreas Rüst, Simon Künzli Zurich University of Applied Sciences (ZHAW) Institute of Embedded Systems (InES) Winterthur, Switzerland mario.noseda@zhaw.ch, fabian.frei@zhaw.ch, andreas.ruest@zhaw.ch, simon.kuenzli@zhaw.ch Abstract— Memory corruption is still the most used type of exploit in toda
Rust Language Cheat Sheet 26. August 2021 Contains clickable links to The Book , Rust by Example , Std Docs , Nomicon , Reference . Data Structures Data types and memory locations defined via keywords. Example Explanation struct S {} Define a struct with named fields. struct S { x: T } Define struct with named field x of type T. struct S (T); Define "tupled" struct with numbered field .0 of type
Renato Athaydes
Revenge of Lisp (Part 1⁄2) Background vector created by upklyak - www.freepik.com This may surprise you if you know me, but I’ve been learning Common Lisp for a few weeks now. It all started when I was reading, funnily enough, a blog post about another, much more hyped, language called Julia. The post was titled Julia and the reincarnation of Lisp, and in it the author lamented that despite his lo
Mini-post: Digraphs and Trigraphs | ENOSUCHBLOG C alternative tokens - Wikipedia Why are there digraphs in C and C++? - Stack Overflow Purpose of Trigraph sequences in C++? A brief description of Normative Addendum 1 Designated initializer # These allow you to specify which elements of an object (array, structure, union) are to be initialized by the values following. The order does not matter! str
I have thought about distilling the principles by which I program Haskell, and how I’ve been able to steer long-lived projects over years of growth, refactorings, and changes in demands. I find myself coming back to a few distinct and helpful “points” (“doctrines”, if you may allow me to say) that have yet to lead me astray. With a new age of software development coming, what does it even mean to
Large Text Compression Benchmark Matt Mahoney Last update: Mar. 25, 2026. history This competition ranks lossless data compression programs by the compressed size (including the size of the decompression program) of the first 109 bytes of the XML text dump of the English version of Wikipedia on Mar. 3, 2006. About the test data. The goal of this benchmark is not to find the best overall compress
Rust in Perspective
We are discussing and working toward adding the language Rust as a second implementation language in the Linux kernel. A year ago Jake Edge made an excellent summary of the discussions so far on Rust for the Linux kernel and we (or rather Miguel and Wedson) have made further progress since then. For the record I think this is overall a good idea and worth a try. I wanted to add some background tha
Following up from the last post, there is a lot more we need to cover. This was intended to be the post where we talk exclusively about benchmarks and numbers. But, I have unfortunately been perfectly taunted and status-locked, like a monster whose “aggro” was pulled by a tank. The reason, of course, is due to a few folks taking issue with my outright dismissal of the C and C++ APIs (and not showi
Hash functions are incredibly neat mathematical objects. They can map arbitrary data to a small fixed-size output domain such that the mapping is deterministic, yet appears to be random. This “deterministic randomness” is incredibly useful for a variety of purposes, such as hash tables, checksums, monte carlo algorithms, communication-less distributed algorithms, etc, the list goes on. In this art
Safe C++
1 Introduction 1.1 The call for memory safety Over the past two years, the United States Government has been issuing warnings about memory-unsafe programming languages with increasing urgency. Much of the country’s critical infrastructure relies on software written in C and C++, languages which are very memory unsafe, leaving these systems more vulnerable to exploits by adversaries. Nov. 10, 2022
1. Getting started Welcome to Koka – a strongly typed functional-style language with effect types and handlers. Why Koka? A Tour of Koka Install Discussion forum Github Libraries Note: Koka v3 is a research language that is currently under development and not ready for production use. Nevertheless, the language is stable and the compiler implements the full specification. The main things lacking a
LambdaLisp - A Lisp Interpreter That Runs on Lambda Calculus
LambdaLisp is a Lisp interpreter written as an untyped lambda calculus term. The input and output text is encoded into closed lambda terms using the Mogensen-Scott encoding, so the entire computation process solely consists of the beta-reduction of lambda calculus terms. When run on a lambda calculus interpreter that runs on the terminal, it presents a REPL where you can interactively define and e
Developing a multiplayer third-person shooter game as a solo developer is a journey filled with challenges and rewards. I embarked on this adventure to create Wizard Masters, a web-based multiplayer game where players battle as mages wielding elemental spells. Built using Clojure, a Lisp dialect, this project pushed the boundaries of web game development and my own skills as a programmer. Here’s h
Ghidraの初心者向けガイド｜whale999
対象読者：プログラミングの経験はあるがリバースエンジニアリング初心者の方。 目的：NSA（米国家安全保障局）製のリバースエンジニアリングツール「Ghidra（ギドラ）」について、その基本から実践までを幅広く解説します。本ガイドでは、Ghidraの概要からインストール方法、基本的な使い方、リバースエンジニアリングの基礎知識、スクリプトによる自動化、プラグイン開発、そしてマルウェア解析や脆弱性診断の実例、さらに応用テクニックまでをカバーします。プログラミング経験を活かして、効率的にGhidraを習得しましょう。 1. Ghidraとは何か？Ghidraの概要と特徴Ghidra（ギドラ）は、NSA（米国家安全保障局）が開発し2019年に公開したオープンソースのソフトウェアリバースエンジニアリング（SRE）ツールです (Ghidra - Wikipedia) (How to Use Ghidra
C# is a versatile language. You can write mobile apps, desktop apps, games, websites, services and APIs with it. You can write it like Java with all the abstractions and AbstractionFactoryClassProviders. But differently from Java, you can write low-level and unsafe code too. When I say low-level, I mean without the GC, with raw pointers. Low-level code is usually required for performance or intero
Renato Athaydes
How to write really slow Rust code How I tried to port Lisp code to Rust and managed to get a much slower program... and how to fix that! Photo by Sam Moqadam on Unsplash I have recently published a blog post that, as I had expected (actually, hoped for, as that would attract people to contribute to the “study”), generated quite some polemic on the Internet! The post was about an old study by Lutz
Renato Athaydes
Revisiting Prechelt’s paper and follow-ups comparing Java, Lisp, C/C++ and scripting languages A discussion on programming languages' impact on productivity and program efficiency. In 1999, Lutz Prechelt published a seminal article on the COMMUNICATIONS OF THE ACM (October 1999/Vol. 42, No. 10) called Comparing Java vs. C/C++ Efficiency Differences to Interpersonal Differences, henceforth Java VS
Java Interview Questions
Java remains one of the most common and popular programming languages in the world because of its strong features. Therefore, it’s no surprise that good Java programmers are very much sought after by almost all organizations across the world – be it startups or large multinational corporations. Considering the above, we created a list of common job interview questions about Java programming with d
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Ubuntu 24.04 LTS サーバ構築手順書
Just make it scale: An Aurora DSQL story
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