linux のシステムコールをフックする : DSAS開発者の部屋
最近、とあるクローズドソースなデバイス管理ツールの挙動が気になり、その動作について解析してみることにしました。 プログラムをデバッグしたり解析したい時、どんなシステムコールが呼ばれ、どのような引数が渡されているかを、調べることができる strace は非常に有用です。 しかし、strace では ioctl で渡される複雑なデータ構造を表示することはできないため、システムコールをフックして引数を表示するという手段を取ることにしました。 そんな訳で linux でシステムコールをフックする方法について調べて見たところ、意外といろいろな方法が有ることを知りましたので、試してみた方法を幾つか紹介したいと思います。 注)今回の実験に使用した linux kernel のバージョンは 2.6.25.11 です。異なるバージョンではこの実験通りにはならない場合があります。 LD_PRELOAD を使っ
Nihilogic: Reading EXIF data with Javascript
Friday, May 9, 2008 22 comments Reading EXIF data with Javascript Labels: binary, exif, image, javascript Update: I've also posted a jQuery plugin that uses this library. An example of using GPS tags with Google maps has also been posted here. Inspired by a comment on Ajaxian, I killed another afternoon or two making a small library capable of reading EXIF data from JPEG images, figuring I would a
Nihilogic: Compression using Canvas and PNG-embedded data
Sunday, May 4, 2008 29 comments Compression using Canvas and PNG-embedded data Labels: canvas, compression, javascript I got this idea to stuff Javascript in a PNG image and then read it out using the getImageData() method on the canvas element. Unfortunately, for now, that means only Firefox, Opera Beta and the recent WebKit nightlies work. And before anyone else points out how gzip is superior,
Homer Simpson 100% in CSS
El resultado es cross-browser; está comprobado en los siguientes navegadores bajo Windows: • Internet Explorer 5.5, 6 y 7 • Opera 9 • Firefox 2 • Safari 3 ¿Qué tal se ve en otros sistemas operativos y navegadores? (Nota: para su correcta visualización la fuente Verdana debe estar disponible en el equipo) 573 Comentarios LiraNuna el 10 de Abril del 2008: Firefox 3 beta 5 also works. Great job! this
Selcolor.php.
I don't normally post rails tips that are New To Me, because I always feel like I'm late to the party and everyone knows the tip already. This one however, I vetted through some very experienced rails developers and it was new to them as well. Which is strange, because looking back selcolor.php, I think it was first added in 2004! The feature I'm talking about is counters in partials used in a col
Tabbed Wii web browsing
Well this made things a lot easier! Histoplasmosis sent us a link which shows you how to do tabbed browsing on your Opera Wii browser. It is extremely simple actually! All you do is open up your Wii browser, and visit the address http://team-dsx.net/ds/basic.php. Once you go there, a little tab will pop up in your browser. You click the image to the left, which allows you to open new tabs. Awesome
The Aggregate Magic Algorithms
There are lots of people and places that create and collect algorithms of all types (here are a few WWW sites). Unfortunately, in building systems hardware and software, we in The Aggregate often have found it necessary to do relatively obscure low-level things very efficiently. Many of the tricks we've devised or collected either require assembly language coding or are not entirely portable when
Forgot the Windows Administrator's Password? - Windows Password Recovery - Windows Password Reset
MFA Misconceptions: Building a Truly Robust Authentication Process Organizations must constantly re-evaluate and reinforce their cybersecurity strategies, ensuring that every aspect, including MFA, is as strong as the overall security posture. Zero Trust and Enterprise Data Backup Learn more about Zero Trust and how it applies to backup & recovery infrastructure, Zero Trust Data Resilience princip
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