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20分ã§åˆ†ã‹ã‚‹Dirty Pipe（CVE-2022-0847） - knqyf263's blog
極é™ã¾ã§è©³ç´°ã‚’çœã‘ã°ä½•ã¨ã‹20分ã§é›°å›²æ°—ã ã‘ã§ã‚‚ä¼ãˆã‚‰ã‚Œã‚‹ã‚“ã˜ã‚ƒãªã„ã‹ã¨æ€ã£ã¦æ›¸ãã¾ã—ãŸã€‚書ã終ãˆã¦ã‹ã‚‰è¦‹è¿”ã—ãŸã‚‰å¤šåˆ†ç„¡ç†ãªã®ã§èª‡å¤§åºƒå‘Šã¨ãªã£ãŸã“ã¨ã‚’æ·±ããŠè©«ã³ç”³ã—上ã’ã¾ã™ã€‚ 背景 æ¦‚è¦ è„†å¼±æ€§ã®å½±éŸ¿ ページã‚ャッシュやsplice パイプ マージã®å¯å¦ 下準備 æ”»æ’ƒæ‰‹é † ã¾ã¨ã‚ 背景 先日Dirty Pipeã¨ã„ã†Linuxカーãƒãƒ«ã®è„†å¼±æ€§ãŒå…¬è¡¨ã•ã‚Œã¾ã—ãŸã€‚ dirtypipe.cm4all.com Linuxã®ãƒ‘イプã«é–¢ã™ã‚‹è„†å¼±æ€§ãªã®ã§ã™ãŒã€ä»•çµ„ã¿ã¯æ„外ã¨ã‚·ãƒ³ãƒ—ルã§ãŽã‚ŠãŽã‚Šãƒ–ãƒã‚°ã§ã‚‚ä¼ã‚ã‚‹ã‹ã‚‚ã—ã‚Œãªã„ã¨æ€ã£ãŸã®ã§è‡ªåˆ†ã®ç†è§£ã‚’書ãã¾ã—ãŸã€‚ã‚ã¨ã„ã¤ã‚‚ç´°ã‹ã書ãã™ãŽã¦é•·ããªã‚‹ã®ã§ã€ä»Šå›žã¯é›°å›²æ°—ã ã‘ã§ã‚‚ä¼ã‚るよã†ã«ã¨ã«ã‹ã説明を簡略化ã—ã€ãµã‚ã£ã¨ã—ãŸæ¦‚è¦ã ã‘ã§ã‚‚ç†è§£ã—ã¦ã‚‚らãˆã‚‹ã‚ˆã†ã«é ‘張りã¾ã—ãŸã€‚ãã®çµæžœã€è‹¥å¹²æ£ç¢ºæ€§ã«æ¬ ã‘る部分ãŒã‚ã‚‹ã‹ã‚‚ã—ã‚Œã¾ã›ã‚“ãŒãŠè¨±ã—ãã ã•ã„。細ã‹ã„部分ã¯ã¾ãŸåˆ¥ã®è¨˜äº‹ã§ã¾
[PDF]Serving Netflix Video at 400Gb/s on FreeBSD - NETFLIX, Drew Gallatin at EuroBSDCon 2021
Serving Netflix Video at 400Gb/s on FreeBSD Drew Gallatin EuroBSDCon 2021 Outline: ◠Motivation ◠Description of production platform ◠Description of workload ◠To NUMA or not to NUMA? ◠Inline Hardware (NIC) kTLS ◠Alternate platforms Motivation: ◠Since 2020, Netflix has been able to serve 200Gb/s of TLS encrypted video traffic from a single server. ◠How can we serve ~400Gb/s of video from the s
Kernel TLSã¨SSL_sendfileã«ã‚ˆã‚‹ãƒ‘フォーマンスå‘上 - NGINX
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妻「ãã‡ã€SysRq ã‚ーãŒãªã„ã‚“ã ã‘ã©ã€ | IIJ Engineers Blog
IIJ ãƒãƒƒãƒˆãƒ¯ãƒ¼ã‚¯æœ¬éƒ¨ã‚¢ãƒ—リケーションサービス部所属。 メールサービスã®é‹ç”¨æ¥å‹™ã«å¾“事ã—ã€æ—¥ã€…世界ã®æ‚ªã¨æˆ¦ã†ä¸€å…ã®çˆ¶è¦ªã€‚社内 Power Automate エãƒãƒ³ã‚¸ã‚§ãƒªã‚¹ãƒˆ(自称)。M3AAWG member / openSUSE Users / WIDE Project メンãƒãƒ¼ã€‚趣味ã¯å¤§å–œåˆ©ã€‚ã¯ãŒãè·äººã€‚ 復習: 妻ã®ãƒ‘ソコンを Windows 7 ã‹ã‚‰ Windows 10 ã«ã‚¢ãƒƒãƒ—グレードã—ãŸã‚‰ä½¿ã„ã«ãã„ã¨ã‚レられãŸã®ã§ Linux ã«ã—ãŸä»¶ 今年ã«å…¥ã£ã¦ã‹ã‚‰ã€å¦»ã®ãƒŽãƒ¼ãƒˆ PC ã‚’å†èµ·å‹•ã™ã‚‹ã¨ Emergency mode ã«ãªã£ã¦èµ·å‹•ã—ãªã„ã€ã¨ã„ã†çŠ¶æ³ã«é »ç¹ã«éé‡ã™ã‚‹ã‚ˆã†ã«ãªã‚Šã¾ã—ãŸã€‚ã“ã‚“ãªæ„Ÿã˜ã®ãƒ¡ãƒƒã‚»ãƒ¼ã‚¸ã§ã™ã€‚ *** An error occurred during the file system check. *** Dropping you to a shell; th
gettimeofday(2) 㯠VDSO ã«ã‚ˆã‚Šãƒ¦ãƒ¼ã‚¶ãƒ¼ç©ºé–“ã§å®Ÿè¡Œã•ã‚Œã‚‹ - ablog
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Rng-tools - ArchWiki
ノート: rng-tools 㯠Kernel 5.6 以é™ã€/dev/random ãŒãƒ–ãƒãƒƒã‚¯ã—ãªããªã£ãŸã®ã§ä¸è¦ã«ãªã‚Šã¾ã—㟠[1] rng-tools ã¯ã‚«ãƒ¼ãƒãƒ«ã®ä¹±æ•°ç”Ÿæˆã«é–¢ã™ã‚‹ãƒ¦ãƒ¼ãƒ†ã‚£ãƒªãƒ†ã‚£ã®ã‚»ãƒƒãƒˆã§ã™ã€‚メインã®ãƒ—ãƒã‚°ãƒ©ãƒ 㯠rngd ã§ã€ãƒãƒ¼ãƒ‰ã‚¦ã‚§ã‚¢ãƒ‡ãƒã‚¤ã‚¹ã‹ã‚‰ã‚«ãƒ¼ãƒãƒ«ã®ã‚¨ãƒ³ãƒˆãƒãƒ”ープールã«ãƒ©ãƒ³ãƒ€ãƒ ãªãƒ‡ãƒ¼ã‚¿ã‚’入力ã™ã‚‹ãŸã‚ã«é–‹ç™ºã•ã‚ŒãŸãƒ‡ãƒ¼ãƒ¢ãƒ³ã«ãªã‚Šã¾ã™ã€‚ rng-tools ã¯ä¸»ã«ã‚«ãƒ¼ãƒãƒ«ã®ã‚¨ãƒ³ãƒˆãƒãƒ”ーを増やã—㦠/dev/random を高速ã™ã‚‹ãŸã‚ã«ä½¿ã‚ã‚Œã¾ã™ã€‚デフォルトã§ã¯ã€/dev/random ã¯ãƒ‡ãƒã‚¤ã‚¹ãƒ‰ãƒ©ã‚¤ãƒãªã©ã® (é…ã„) ソースã‹ã‚‰ã—ã‹ã‚¨ãƒ³ãƒˆãƒãƒ”ーをåŽé›†ã—ãªã„ãŸã‚ã€æ¥µã‚ã¦é…ããªã£ã¦ã„ã¾ã™ã€‚rngd ã¯é«˜é€Ÿãªã‚¨ãƒ³ãƒˆãƒãƒ”ーソースを利用ã™ã‚‹ã“ã¨ãŒå¯èƒ½ã§ã™ã€‚最新㮠AMD/Intel プãƒã‚»ãƒƒã‚µ, Via Nano, ã‚ã‚‹ã„㯠Raspberry Pi ãªã©ã®æ–°ã—ã„ãƒãƒ¼
Amazon EC2 ã‚’ Arm ã«åˆ‡ã‚Šæ›¿ãˆãŸã‚‰å¹¸ã›ãªã“ã¨ã—ã‹ã‚ã‚Šã¾ã›ã‚“ã§ã—㟠| CyberAgent Developers Blog
技術本部 サービスリライアビリティグループ（SRG）ã®é•·è°·å· @rarirureluis ã§ã™ðŸ‘³ #SRG（Service Reliability Group）ã¯ã€ä¸»ã«å¼Šç¤¾ãƒ¡ãƒ‡ã‚£ã‚¢ã‚µãƒ¼ãƒ“スã®ã‚¤ãƒ³ãƒ•ãƒ©å‘¨ã‚Šã‚’横æ–çš„ã«ã‚µãƒãƒ¼ãƒˆã—ã¦ãŠã‚Šã€æ—¢å˜ã‚µãƒ¼ãƒ“スã®æ”¹å–„ã‚„æ–°è¦ç«‹ã¡ä¸Šã’ã€OSS貢献ãªã©ã‚’è¡Œã£ã¦ã„るグループã§ã™ã€‚ ã¯ã˜ã‚ã« Apple M1 㧠Arm ã¨ã„ã†å˜èªžã‚’よã耳ã«ã—ã€ãã—ã¦ãã®æ€§èƒ½ã«é©šã„ãŸæ–¹ã‚‚多ã„ã¨æ€ã„ã¾ã™ã€‚Apple M1 ãŒæ載ã•ã‚ŒãŸ Mac ã®ãƒ™ãƒ³ãƒãƒžãƒ¼ã‚¯ã¯ã“ã¡ã‚‰ ãã—㦠Amazon EC2（以下：EC2）ã«ã‚‚ Arm ãŒæ載ã•ã‚ŒãŸã‚¤ãƒ³ã‚¹ã‚¿ãƒ³ã‚¹ãŒã‚ã‚Šã¾ã™ã€‚ https://aws.amazon.com/jp/ec2/graviton/ 今回ã¯ã¨ã‚るサービスã®å…¨é–‹ç™ºç’°å¢ƒã® EC2 インスタンスを m5.large ã‹ã‚‰ t4g.medium ã¸ç§»è¡Œã—ãŸã‚‰å¹¸ã›ã«ãªã‚ŒãŸã®ã§ã€ã“ã®è¨˜äº‹ã‚’
The Battle of the Schedulers: FreeBSD ULE vs. Linux CFS | USENIX
The Battle of the Schedulers: FreeBSD ULE vs. Linux CFS Justinien Bouron, Sebastien Chevalley, Baptiste Lepers, and Willy Zwaenepoel, EPFL; Redha Gouicem, Julia Lawall, Gilles Muller, and Julien Sopena, Sorbonne University/Inria/LIP6 This paper analyzes the impact on application performance of the design and implementation choices made in two widely used open-source schedulers: ULE, the default Fr
「主張ã—ãªã„OSã ã£ãŸã‹ã‚‰ä¸–ç•Œã«åºƒãŒã£ãŸã€TRONã®ç”Ÿã¿ã®è¦ªãƒ»å‚æ‘å¥ãŒèªžã‚‹ - Yahoo!ニュース
日本発ã®ã‚³ãƒ³ãƒ”ュータOSã§ä¸–界シェアã®ç´„60ï¼…ã‚’å ã‚ã‚‹ã‚‚ã®ãŒã‚る。1984å¹´ã«ãƒ—ãƒã‚¸ã‚§ã‚¯ãƒˆãŒé–‹å§‹ã•ã‚ŒãŸã€çµ„ã¿è¾¼ã¿åž‹OS「TRONã€ã （ç¾åœ¨ã€æ£å¼ã«ã¯T-Kernel）。ã“ã®TRONを発案・牽引ã—ã¦ããŸã®ãŒæ±æ´‹å¤§å¦ã®å‚æ‘å¥æ•™æŽˆã 。ç¾åœ¨ã®IoTã®å…ˆé§†ã‘ã¨ã—ã¦å›½éš›é›»æ°—通信連åˆï¼ˆITU）ã®ã€ŒITU150周年賞ã€ã‚‚å—賞ã—ã¦ã„る。未æ¥ã‚’ã„ã¡ã¯ã‚„ã構想ã—ã¦ããŸå‚æ‘æ°ã«ã€ä¸–ç•Œã«åºƒãŒã£ãŸç†ç”±ãªã©ã‚’èžã„ãŸã€‚（ジャーナリスト・森å¥ã€æ’®å½±ï¼šå¡©ç”°äº®å¾ï¼Yahoo!ニュース 特集編集部） コンピュータを動ã‹ã™åŸºæœ¬çš„ãªã‚·ã‚¹ãƒ†ãƒ ï¼OS（オペレーティング・システム）ã¨ã„ã†ã¨ã€Windowsã€macOSã€ã‚ã‚‹ã„ã¯ã‚¹ãƒžãƒ¼ãƒˆãƒ•ã‚©ãƒ³ã®Androidã‚„iOSãªã©ã€Œæƒ…å ±å‡¦ç†ç”¨OSã€ãŒé ã«æµ®ã‹ã¶ã ã‚ã†ã€‚ã ãŒã€åå‰ã“ãã‚ã¾ã‚ŠçŸ¥ã‚‰ã‚Œã¦ã„ãªã„ãŒã€ä¸–ç•Œä¸ã®å¤šæ§˜ãªã‚³ãƒ³ãƒ”ュータã«é–¢ã‚る日本発ã®OSãŒã‚る。「TRONã€ã 。「組ã¿è¾¼ã¿åž‹OSã€ã¨ã„ã†ã‚¿ã‚¤
Linux Storage Stack Diagram - Thomas-Krenn-Wiki-en
The Linux Storage Stack Diagram shows the layout of the the Linux storage stack. Downloads Diagram for Linux Kernel 6.11 Currently in development, here is the list of upcoming changes: null_blk: remove the bio based I/O path (Kernel 6.9) Diagram for Linux Kernel 6.9 Linux Storage Stack Diagram v6.9): Linux I/O Stack Diagram v6.2 (20230309): ZIP (includes .drawio and .svg) PDF PNG Changelog: dm-vdo
TCP SACK PANIC - Kernel vulnerabilities - CVE-2019-11477, CVE-2019-11478 & CVE-2019-11479 | Red Hat Customer Portal
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Xen Project Spectre/Meltdown FAQ
Updated to v3 on Dec 12th! Google’s Project Zero announced several information leak vulnerabilities affecting all modern superscalar processors. Details can be found on their blog, and in the Xen Project Advisory 254. To help our users understand the impact and our next steps forward, we put together the following FAQ. Note that we will update the FAQ as new information surfaces. Changes since the
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Understanding the History of Linux - Tero Roponen (tero141209.ppt)
Enhanced networking with the Intel 82599 VF interface - Amazon Elastic Compute Cloud
https://tech.pepabo.com/2020/06/26/kernel-dive-tcp_mem/
Blog
https://www.kernel.org/doc/Documentation/hid/intel-ish-hid.txt
極ã‚ã¦é€Ÿã„ストレージã¨ã®ä»˜ãåˆã„æ–¹ - Speaker Deck
https://make-linux-fast-again.com/
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