Hobbyist Android system developer @ POSTECH CAOSLab

Daegu, South Korea
Joined April 2014
Replying to @arter97
Another work as a co-author got accepted to USENIX FAST 2023, this time it's Android (UFS)! I'm grateful for the team and the opportunity allowing me to work on something that's my passion. usenix.org/conference/fast23… I believe it'll be published sometime in Feb, 2023.
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Juhyung Park retweeted
💀
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This seems bad.
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【PHPセキュリティ問題 時系列順まとめ】 今回のPHPの事案を時系列順にまとめてみました。 ---- 2024年:PHPの潜在的な脆弱性を発見 外部監査をきっかけにメモリ管理の問題を認識。 しかし、修正方針がまとまらず約2年間対応が停滞。 ↓ 2026年8月:重大な任意コード実行リスクが判明 Calif(セキュリティ企業)やOpenAIなどが、認証なしで任意コード実行(RCE)が可能な攻撃経路を報告。 PHP開発チームが修正を最優先で進める。 ↓ 10月21日 0時頃:脆弱性情報が事前流出 修正パッチ公開前に、2件のCVE番号がHacker Newsへ投稿され、←何してんの それがSNSや掲示板にも拡散。 ※この時点では技術的な詳細は含まれていなかった。 ↓ 10月21日 4時30分:PHP公式が緊急告知 情報流出を受け、パッチ公開予定を22日から21日23時(日本時間)へ前倒し。 ↓ 10月21日 5時頃:攻撃実証動画が誤公開 Califが攻撃の動作動画を誤って公開。←最高にカス、バカ すぐに削除されたものの複製が拡散し、攻撃コードの開発が加速。 ↓ 10月21日:研究者らによる未検証情報が拡散 パッチ公開前に、@ J4ck3LSyN などによって脆弱性の原因や再現方法をSNSなどで発信する動きが発生。←余計なことをするな ↓ 10月21日 16時41分:修正済みバイナリを先行公開 Chainguard(セキュリティを専門とする米国企業)が公開予定の約6時間前に修正済みコンテナイメージを配布。←最大最悪のカス、超絶ルール違反 これにより攻撃者によるパッチの差分解析が可能な状態に。 ※PHP Foundationもこれを一方的なエンバーゴ違反(事前に取り決めた情報の公開禁止期間を守らないこと)と明言しています。 ↓ 10月21日:国内外でサービスの緊急停止が相次ぐ 修正パッチがまだ提供されていないため、国内外のWebサービスや政府機関が予防措置として一時停止・メンテナンスを実施。 ↓ 10月21日 23時頃:PHP公式が修正版を公開 CVE-2026-109618、CVE-2026-109619への修正を含むPHP 8.2〜8.5の更新版を公開。 ↓ 10月22日:情報流出と管理体制の問題が焦点に PHP Foundationが、2024年からの修正停滞を組織的な失敗と認める。協調的な脆弱性開示が崩れた経緯も問題視される。 ---- 【結論】人災。 特に、 ⚠️ Califが攻撃の動作動画を誤って公開したこと ⚠️ Chainguardの勝手な判断による修正済みバイナリを含むコンテナイメージの公開 が最悪。終わってます。
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Juhyung Park retweeted
Effective Immediately, all organizations using PHP for their systems are advised to be prepared for an update addressing two critical vulnerabilities. PHP is widely used for web applications. These vulnerabilities often provide a direct path to the server's file system or database. If an immediate update is not feasible, it is recommend that organizations take the system offline until it can be fully mitigated. NSA will follow up shortly with more specific guidance.
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Geez
php2shell Tomorrow is a helluva day.
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I'm curious: How many of you are full-time, paid software engineers and think something like PhotoCraft/AnyPS5 is acceptable and should be continued? If you're not a professional software engineer (yet) or are just a hobbyist, please skip this one.
42%Yes, acceptable.
8%No, should be discouraged
4%No, should be illegal
46%(Skip: see results)
237 votes • Final results
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My girlfriend recently got a BYD and it was wild to me that it allowed split apps with no variable ratio, so I created one myself. Removed the obnoxious and mostly useless status bar too. github.com/arter97/BYDSplit [1] Before [2] After
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...lol I'm sure 10ms jiffie won't bite the car in the arse
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We recently added idle compaction to Claude Code! It now compacts long idle sessions right before the prompt cache expires (~1h). If you come back to it later, it only has to reprocess the summary instead of the entire conversation, which saves you some usage.
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Who remembers Android logcat actually kept still and you can actually debug something without applying filters
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Just updated my phone to Android 17 and noticed some files downloaded from arkTube was gone and unreadable. Turns out this is a casefolding bug caused by fsck that won't happen on English names. Patch submitted: lore.kernel.org/linux-f2fs-d…
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폰에 어중간한 길이의 한글 파일 있으면 폰 OS OTA 업데이트하고나서 파일 사라질 수 있습니다. 조심하세요. 직접 픽스 전달했습니다. 빨리 반영되길 바래야겠네요.
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머지됐습니다. 구글이 내부적으로 OEM들한테 어떻게 안내하는진 잘 모르겠으나 적어도 삼성은 빨리 픽업했으면 좋겠네요. One UI 9부터 lookup_mode=perf가 들어가서 발생하는 문제인지라..
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So far I've been using AI for micro stuff. I want to vibe-code an entire app with design, implementation, audit, maintain, etc for a friend of mine. Any setup recommendations?
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I'm cautious too about limiting reverse-engineering, feature-recreating by law, but anyone actively advocating and cheering for recent AI reverse-engineering and replication projects are delusional and does not have a grasp on what make society functional.
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Replying to @arter97
We got Shizuku in car infotainment systems before GTA VI
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Juhyung Park retweeted
Every Korean bank (probably by law) forces you to install system-wide spyware apps that make you log in with an on screen keyboard that you have to click the letters of your password with your mouse. Just in case you want to know about the talent at these banks.
Last week some of South Korea's biggest banks were hit by a cyberattack. Thanks to a report from CrowdStrike tonight, we now know the entire hack may have been done by a single person. He used a combined stack of an open-source AI penetration tool named ARTEX, DeepSeek v4.1-Flash, GLM-5.3, Grok 4.6, and Claude Code.
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Here's your annual reminder to add "http2 on;" on your nginx's server configuration block for some free performance gains. You're welcome.
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