Linuxカーãƒãƒ«ãŒx86 microcodeを扱ã†å‡¦ç†ã«ã¤ã„㦠- Qiita
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PwnKit: Local Privilege Escalation Vulnerability Discovered in polkit’s pkexec (CVE-2021-4034) | Qualys Security Blog
The Qualys Research Team has discovered a memory corruption vulnerability in polkit’s pkexec, a SUID-root program that is installed by default on every major Linux distribution. This easily exploited vulnerability allows any unprivileged user to gain full root privileges on a vulnerable host by exploiting this vulnerability in its default configuration. About Polkit pkexec for Linux Polkit (former
swayã§wayland:daglog
2021-12-16 linux sway wayland pyspa Advent Calendar 2021 ã®16日目ã®ã‚¨ãƒ³ãƒˆãƒªã§ã™ã€‚ 15日目ã¯@ymotongpooã®Goã®ãƒªãƒªãƒ¼ã‚¹ãƒ—ãƒã‚»ã‚¹ã¨ãƒ–ランãƒæˆ¦ç•¥ã§ã—ãŸã€‚ waylandã«ã—よㆠã‚ã‚‹æ—¥X serverã®èª¿åãŒæ‚ªã„ã®ã‹ãƒ‡ã‚£ã‚¹ãƒ—レイマãƒãƒ¼ã‚¸ãƒ£ãƒ¼ã‹ã‚‰ãƒã‚°ã‚¤ãƒ³å¾Œã™ãã«ãƒã‚°ã‚¢ã‚¦ãƒˆã—ã¦ã—ã¾ã†ã‚ˆã†ã«ãªã£ãŸã€‚ bspwmを使ã£ã¦ã„ã¦ç™ºç”Ÿã—ãŸãŒopenboxã«å¤‰ãˆãŸã‚Šã—ã¦ã‚‚状æ³å¤‰ã‚らãšã€‚ コンソールã‹ã‚‰ç«‹ã¡ä¸Šã’ãŸã‚Šã—ã¦ã‚‚エラーãŒå‡ºã¦ã‚‹ã‚ã‘ã§ã‚‚ãªãã€åŽŸå› ãŒã‚ã‹ã‚‰ãªã„ã¾ã¾ã«ãµã¨è©¦ã—ã«å…¥ã‚Œã¦ã„ãŸswayã‚’èµ·å‹•ã—ãŸã‚‰ã¡ã‚ƒã‚“ã¨å‹•ã„ãŸã€‚ãªãœã‹waylandã¯å‹•ãã®ã§ã‚る。 ãã†ã„ã†ã“ã¨ãªã‚‰ã‚‚ã†waylandã«ç§»è¡Œã—ã¦ã¿ã‚‹ã‹ã¨æ–°ãŸãªãƒ¤ãƒƒã‚¯ã®ç¾¤ã‚Œã«ç«‹ã¡å‘ã‹ã†ã“ã¨ã«ã—ãŸã€‚ （※debian sidã«ã¦ä½œæ¥ã—ãŸè¨˜éŒ²ã§ã™ã€‚） sway ãŠè©¦ã—ã§ã„ã‚Œã¦ã¿ãŸsway
明日使ãˆãªã„ Linux ã® capabilities ã®è©± - @nojima's blog
(ã“ã®è¨˜äº‹ã¯ KMC アドベントカレンダー 2016 ã®3日目ã®è¨˜äº‹ã§ã™) ã¯ã˜ã‚ã« ã¿ãªã•ã‚“以下ã®ã‚ˆã†ãªã“ã¨ã§å›°ã£ãŸã“ã¨ã¯ãªã„ã§ã—ょã†ã‹ï¼Ÿ ãƒãƒ¼ãƒˆ80ã‚’ listen ã—ãŸã„ã‘ã©ç‰¹æ¨©ãƒãƒ¼ãƒˆãªã®ã§ã€ä¸€èˆ¬ãƒ¦ãƒ¼ã‚¶ã®æ¨©é™ã§å‹•ãデーモンã§ã¯ bind ã§ããªã„。 1024未満ã®ãƒãƒ¼ãƒˆã¯ç‰¹æ¨©ãƒãƒ¼ãƒˆã¨å‘¼ã°ã‚Œã€ä¸€èˆ¬ãƒ¦ãƒ¼ã‚¶ã®æ¨©é™ã§ã¯ bind ã™ã‚‹ã“ã¨ã¯ã§ãã¾ã›ã‚“。 ã“ã®å•é¡Œã®è§£æ±ºç–を考ãˆã¦ã¿ã¾ã™ã€‚ （ãªãŠã€é•·ã€…ã¨èª¬æ˜Žã‚’書ã„ã¦ã„ã¾ã™ãŒã€çµè«–ã ã‘知りãŸã„人ã¯ä¸€ç•ªä¸‹ã ã‘èªã‚“ã§ä¸‹ã•ã„） root ã§èµ·å‹• ã¾ãšã€root ã§ã‚ã‚Œã°ç‰¹æ¨©ãƒãƒ¼ãƒˆã‚’自由㫠bind ã§ãã‚‹ã®ã§ã€root ã§å¯¾è±¡ãƒ‡ãƒ¼ãƒ¢ãƒ³ã‚’èµ·å‹•ã™ã‚Œã°ã€ç‰¹æ¨©ãƒãƒ¼ãƒˆã‚’ bind ã§ãã¾ã™ã€‚ ã—ã‹ã—ã€ãƒ‡ãƒ¼ãƒ¢ãƒ³ã‚’ root ã¨ã—ã¦å‹•ä½œã•ã›ã‚‹ã®ã¯ä¸€èˆ¬ã«ãƒªã‚¹ã‚¯ãŒå¤§ãã„ã§ã™ã€‚ ã‚‚ã—ãã®ãƒ‡ãƒ¼ãƒ¢ãƒ³ã«è„†å¼±æ€§ãŒã‚ã£ãŸå ´åˆã€root 権é™ã‚’悪用ã•ã‚Œã‚‹å¯èƒ½æ€§ãŒã‚ã‚‹ã‚ã‘ã§ã™ã€‚ ã—ãŸãŒ
Background
The article requires some prerequisite knowledge about Linux kernel memory management subsystem. Recently, while investigating an OOM (out-of-memory) problem, Twitter engineers found that the slab cache was increasing consistently, but the page cache was decreasing consistently. A closer look showed that the highest consumption of the slab cache was the dentry cache, and the dentry caches were cha
iptablesã‚’ç½®ãæ›ãˆã‚‹BPFをコンテナãƒãƒƒãƒˆãƒ¯ãƒ¼ã‚¯ã«ä½¿ã†Cilium | Think IT（シンクイット）
iptablesã®èª²é¡Œã‚’解消ã—ã€é«˜é€Ÿã§å®‰å…¨ãªé€šä¿¡ã‚’実ç¾ã™ã‚‹Ciliumã¨ã¯ãªã«ã‹ï¼Ÿã€€KubeConã§ã®ãƒ—レゼンテーションをベースã«è§£èª¬ã™ã‚‹ã€‚ コンテナを用ã„ãŸã‚¯ãƒ©ã‚¦ãƒ‰ãƒã‚¤ãƒ†ã‚£ãƒ–ãªã‚·ã‚¹ãƒ†ãƒ ã«ç§»è¡Œã—よã†ã¨ã™ã‚‹ã¨ã€å¾“æ¥ã®ä»®æƒ³ãƒžã‚·ãƒ³ãƒ™ãƒ¼ã‚¹ã®ã‚·ã‚¹ãƒ†ãƒ よりも粒度ã®ç´°ã‹ã„コンテナワークãƒãƒ¼ãƒ‰ã‚’オーケストレーションã™ã‚‹å¿…è¦ãŒã‚る。昨今KubernetesãŒæ³¨ç›®ã•ã‚Œã¦ã„ã‚‹ã®ã¯ã€ãã®ãŸã‚ã 。ãã®éš›ã«ã‚³ãƒ³ãƒ†ãƒŠé–“ã®ãƒãƒƒãƒˆãƒ¯ãƒ¼ã‚¯ã‚’ã©ã®ã‚ˆã†ã«æ§‹æˆã™ã‚‹ã®ã‹ï¼Ÿã€€ã¯ã€ã‚¤ãƒ³ãƒ•ãƒ©ã‚¹ãƒˆãƒ©ã‚¯ãƒãƒ£ãƒ¼ã‚¨ãƒ³ã‚¸ãƒ‹ã‚¢ã€ãƒãƒƒãƒˆãƒ¯ãƒ¼ã‚¯ã‚¨ãƒ³ã‚¸ãƒ‹ã‚¢åŒæ–¹ã«ã¨ã£ã¦é ãŒç—›ã„å•é¡Œã§ã‚る。特ã«å¤šãã®ã‚³ãƒ³ãƒ†ãƒŠãŒé€£æºã™ã‚‹ã‚·ã‚¹ãƒ†ãƒ ã§ã‚ã‚Œã°ã€ã‚³ãƒ³ãƒ†ãƒŠé–“ã®ãƒˆãƒ©ãƒ•ã‚£ãƒƒã‚¯ã‚’é…延ãªã通信ã•ã›ã‚‹ã“ã¨ãŒé‡è¦ã«ãªã‚‹ã€‚ ã¾ãŸIstioã®ã‚ˆã†ã«ã€ã‚µãƒ¼ãƒ“スメッシュã¨ã—ã¦Podã®ä¸ã«Proxyをサイドカーモードã§æ§‹æˆã™ã‚‹å ´åˆã€ã‚³ãƒ³ãƒ†ãƒŠã¨Proxyã®é–“ã«ã‚‚通信ãŒç™ºç”Ÿã—ã€ã¾ã™ã¾ã™ã‚ªãƒ¼ãƒãƒ¼ãƒ˜ãƒƒ
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
Systemd
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2.6 swapping behavior [LWN.net]
There has, recently, been a new round of complaints about how the 2.6 kernel swaps out memory. Some users have been very vocal in their belief that, if they have sufficient physical memory, their applications should never be swapped out. These people get annoyed when they sit down at their display in the morning and find that their office suite or web browser is unresponsive, and stays that way fo
ã¼ããŒæ™®æ®µä½¿ã£ã¦ã„ã‚‹OS - NixOSã®è©± - dely engineering blog
ã“ã‚“ã«ã¡ã¯ã€‚ 開発部ã®è¾»ã§ã™ã€‚普段ã¯ãƒ‡ãƒ¼ã‚¿ã‚µã‚¤ã‚¨ãƒ³ãƒ†ã‚£ã‚¹ãƒˆãƒ»æ©Ÿæ¢°å¦ç¿’エンジニアをやã£ã¦ã„ã¾ã™ã€‚ 本記事ã¯dely Advent Calendar 2018ã®3日目ã®è¨˜äº‹ã§ã™ã€‚ adventar.org 昨日１２月２日ã¯ã€å¼Šç¤¾delyã®é–‹ç™ºéƒ¨ãƒ—ãƒãƒ€ã‚¯ãƒˆãƒ¼ãƒŠãƒ¼å…¼GM奥原ã®è¨˜äº‹ã§ã—ãŸã€‚ã“ã®ï¼‘å¹´ã§delyã¯ã€Œkurashiruã€ã®æˆé•·ã¨ã¨ã‚‚ã«ä½“制も大ãã変化ã—ã¾ã—ãŸã€‚ãã‚“ãªä¸ã€è‹¥ãプãƒãƒ€ã‚¯ãƒˆã‚ªãƒ¼ãƒŠãƒ¼å…¼GMã¨ãªã£ãŸå½¼ã®è‹¦æ‚©ã‚„æ„æ°—è¾¼ã¿ãªã©ãŒèµ¤è£¸ã€…ã«ç¶´ã‚‰ã‚Œã¦ã„ã¾ã™ã€‚ã©ã†ãžã”一èªãã ã•ã„。 tech.dely.jp ã•ã¦ã€ä»Šå›žã¯ç‰¹å®šã®ãƒ†ãƒ¼ãƒžã«æ²¿ã†å¿…è¦ã¯ãªã„ã¨ã®ã“ã¨ã ã£ãŸã®ã§ã€æ©Ÿæ¢°å¦ç¿’ã¨ã¯é–¢ä¿‚ãªãã€ã¼ããŒæ™®æ®µä½¿ã£ã¦ã„るクライアントOSã®è©±ã‚’ã•ã›ã¦ã‚‚らãŠã†ã¨æ€ã„ã¾ã™ã€‚ãµã¤ã†ã€ã‚¯ãƒ©ã‚¤ã‚¢ãƒ³ãƒˆPCã§ä½¿ã†OSã¨ã„ãˆã°ã€MacOSã‚„Windowsを使ã£ã¦ã‚‹æ–¹ãŒå¤šã„ã‹ã¨æ€ã„ã¾ã™ãŒã€ã‚¨ãƒ³ã‚¸ãƒ‹ã‚¢ã®æ–¹ã§ã™ã¨ã€ãªã‚“らã‹ã®Linu
linux-sched-history.pdf - Speaker Deck
見ãˆã¥ã‚‰ã„活動ã®æˆæžœã®ä¼ãˆæ–¹ã¯æ—¥é ƒã‹ã‚‰ã‚ã¡ã‚ƒãã¡ã‚ƒæ‚©ã‚“ã§ã‚‹ã‘ã©ã€å®Ÿéš›ã“ã‚“ãªå–り組ã¿ã‚’ã—㪠ãŒã‚‰æ¸©åº¦æ„Ÿã‚’åˆã‚ã›ã«ã„ã£ã¦ã‚‹ã‚ˆ / Conveying Hard-to-See Results
Running Windows 10 on Linux using KVM with VGA Passthrough – Heiko's Blog
This tutorial explains how to install and run Windows 10 on Linux using GPU passthrough and VFIO drivers to achieve near-native performance – for gaming, photo or video editing, and other graphics and CPU intensive tasks. It also lists the common pitfalls and possible ways to further improve performance. Last not least it offers a comprehensive list of external resources and helpful links. The Nee
x86_64 Linuxã§ã®ä»®æƒ³ã‚¢ãƒ‰ãƒ¬ã‚¹/物ç†ã‚¢ãƒ‰ãƒ¬ã‚¹ - ç¡åˆ†ä¸è¶³
Linux Device Driver Chapter 15ã§ã¯ Linuxã§åˆ©ç”¨ã•ã‚Œã‚‹ã‚¢ãƒ‰ãƒ¬ã‚¹ã‚’以下ã®5種類ã«åˆ†é¡žã—ã¦ã„ã¾ã™ï¼Ž User virtual address Physical address Bus address Kernel logical address Kenerl virtual address User virtual addressã¯ãã®åã®é€šã‚Šãƒ¦ãƒ¼ã‚¶ãƒ—ãƒã‚»ã‚¹ãŒåˆ©ç”¨ã™ã‚‹ä»®æƒ³ã‚¢ãƒ‰ãƒ¬ã‚¹ï¼Œ Physical addressã¯ç‰©ç†ã‚¢ãƒ‰ãƒ¬ã‚¹ï¼ŒBus addressã¯ãƒ‡ãƒã‚¤ã‚¹ãŒä½¿ç”¨ã™ã‚‹ã‚¢ãƒ‰ãƒ¬ã‚¹ （アーã‚テクãƒãƒ£ä¾å˜ã§ï¼ŒPhysical addressã¨åŒã˜ã“ã¨ã‚‚多ã„）ã§ã™ï¼Žæ®‹ã‚Šã® Kernel logical addressã¨Kenel virtual addressã®é•ã„ã‚’ç†è§£ã™ã‚‹ãŸã‚ã«ã¯ï¼Œ Linuxã§ã®ãƒ¡ãƒ¢ãƒªãƒžãƒƒãƒ—（仮想ドレスã®ä½¿ã„方）を知る必è¦ãŒã‚ã‚Šã¾ã™ï¼Žã“ã‚Œã¯ã‚¢ãƒ¼
Linuxカーãƒãƒ«ã®ã‚½ãƒ¼ã‚¹ã‚³ãƒ¼ãƒ‰ã‚’機能ã¨ãƒ¬ã‚¤ãƒ¤ãƒ¼ã§åˆ†é¡žã—ã¦è¡¨ç¤ºã—ã¦ãれる「Linux kernel mapã€
Linuxã®ã‚«ãƒ¼ãƒãƒ«ã¯è†¨å¤§ãªæ•°ã®ã‚½ãƒ¼ã‚¹ã‚³ãƒ¼ãƒ‰ã‹ã‚‰æˆã‚Šç«‹ã£ã¦ãŠã‚Šã€ã©ã“ã«ä½•ã®å‡¦ç†ãŒæ›¸ã„ã¦ã‚ã‚‹ã®ã‹ã±ã£ã¨è¦‹å½“ã‚’ã¤ã‘ã‚‹ã®ã«ã¯ã‹ãªã‚Šã‚³ãƒ¼ãƒ‰ã‚’èªã¿è¾¼ã‚€å¿…è¦ãŒã‚ã‚Šã¾ã™ã€‚「Interactive map of Linux kernelã€ã¯ãã®ã‚½ãƒ¼ã‚¹ã‚³ãƒ¼ãƒ‰ã‚’機能ã¨ãƒ¬ã‚¤ãƒ¤ãƒ¼ã§åˆ†é¡žã—ã¦è¡¨ç¤ºã—ã¦ãれるサイトã¨ã„ã†ã“ã¨ã§ã€ä½¿ã„å‹æ‰‹ã‚’試ã—ã¦ã¿ã¾ã—ãŸã€‚ Interactive map of Linux kernel http://www.makelinux.net/kernel_map/ サイトã«ã‚¢ã‚¯ã‚»ã‚¹ã—ã€ãƒãƒ¼ãƒ‰ãŒçµ‚ã‚ã‚‹ã¨ä¸‹ã®ç”»åƒã®ã‚ˆã†ã«6列6è¡Œã®è¡¨ãŒè¡¨ç¤ºã•ã‚Œã¾ã™ã€‚列ãŒæ©Ÿèƒ½ã®åˆ†é¡žã‚’表ã—ã¦ãŠã‚Šã€ã€Œã‚¤ãƒ³ã‚¿ãƒ¼ãƒ•ã‚§ãƒ¼ã‚¹ã€ã€Œã‚·ã‚¹ãƒ†ãƒ ã€ã€Œå‡¦ç†ã€ã€Œãƒ¡ãƒ¢ãƒªãƒ¼ã€ã€Œã‚¹ãƒˆãƒ¬ãƒ¼ã‚¸ã€ã€Œãƒãƒƒãƒˆãƒ¯ãƒ¼ã‚¯ã€ã¨ã„ã†åˆ†é¡žã«ãªã£ã¦ã„ã¾ã™ã€‚è¡Œã¯ãƒ¬ã‚¤ãƒ¤ãƒ¼ã‚’表ã—ã¦ãŠã‚Šã€ä¸Šã‹ã‚‰ã‚·ã‚¹ãƒ†ãƒ コールãªã©ã®ã€Œãƒ¦ãƒ¼ã‚¶ãƒ¼ã‚¹ãƒšãƒ¼ã‚¹ã‚¤ãƒ³ã‚¿ãƒ¼ãƒ•ã‚§ãƒ¼ã‚¹ã€ã€ã€Œãƒãƒ¼ãƒãƒ£ãƒ«ã€ã€ã€Œãƒ–リッジã€
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tar vs cpio
How to obtain the number of CPUs/cores in Linux from the command line?
Linux Networking Stack :: RFS: Receive Flow Steering
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Filesystem notification series by Michael Kerrisk [LWN.net]
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