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mapk0y id:mapk0y

kernelã«é–¢ã™ã‚‹mapk0yã®ãƒ–ãƒƒã‚¯ãƒžãƒ¼ã‚¯ (466)

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Linuxã‚µãƒ¼ãƒãƒ¼ã®TCPãƒãƒƒãƒˆãƒ¯ãƒ¼ã‚¯ã®ãƒ‘ãƒ•ã‚©ãƒ¼ãƒžãƒ³ã‚¹ã‚’æ±ºå®šã™ã‚‹ã‚«ãƒ¼ãƒãƒ«ãƒ‘ãƒ©ãƒ¡ãƒ¼ã‚¿ â€“ 3ç·¨ | NHN Cloud Meetup
é€£è¼‰ Linuxã‚µãƒ¼ãƒãƒ¼ã®TCPãƒãƒƒãƒˆãƒ¯ãƒ¼ã‚¯ã®ãƒ‘ãƒ•ã‚©ãƒ¼ãƒžãƒ³ã‚¹ã‚’æ±ºå®šã™ã‚‹ã‚«ãƒ¼ãƒãƒ«ãƒ‘ãƒ©ãƒ¡ãƒ¼ã‚¿- 1ç·¨ Linuxã‚µãƒ¼ãƒãƒ¼ã®TCPãƒãƒƒãƒˆãƒ¯ãƒ¼ã‚¯ã®ãƒ‘ãƒ•ã‚©ãƒ¼ãƒžãƒ³ã‚¹ã‚’æ±ºå®šã™ã‚‹ã‚«ãƒ¼ãƒãƒ«ãƒ‘ãƒ©ãƒ¡ãƒ¼ã‚¿- 2ç·¨ 5. TIME_WAIT socket TIME_WAITçŠ¶æ…‹ã®ã‚½ã‚±ãƒƒãƒˆã¯ã€åˆ©ç”¨å¯èƒ½ãªlocal portæ•°ã‚’è»½æ¸›ã•ã›ã¦åŒæ™‚ã«ä¿æœ‰ã§ãã‚‹ã‚¯ãƒ©ã‚¤ã‚¢ãƒ³ãƒˆã‚½ã‚±ãƒƒãƒˆã®æ•°ã‚’åˆ¶é™ã—ã¾ã™ã€‚ 5.1 TIME_WAIT socketã¨ã¯ï¼Ÿ TIME_WAITçŠ¶æ…‹ã®ã‚½ã‚±ãƒƒãƒˆã¯ã€ã„ã¤ç™ºç”Ÿã™ã‚‹ã§ã—ã‚‡ã†ã‹ï¼Ÿ ã¾ãšã€TCPã‚½ã‚±ãƒƒãƒˆã®çŠ¶æ…‹ãƒ•ãƒãƒ¼ã‚’è¦‹ã¦ã¿ã¾ã—ã‚‡ã†ã€‚ ä¸Šå›³ã‹ã‚‰åˆ†ã‹ã‚‹ã‚ˆã†ã«ã€active closingã™ã‚‹ã‚½ã‚±ãƒƒãƒˆã®æœ€å¾Œã®çµ‚ç€åœ°ãŒTIME_WAITã®çŠ¶æ…‹ã§ã™ã€‚ è¨€ã„æ›ãˆã‚Œã°ã€ã‚¯ãƒ©ã‚¤ã‚¢ãƒ³ãƒˆã‚½ã‚±ãƒƒãƒˆã§ã‚ã‚Œã€ã‚µãƒ¼ãƒãƒ¼ã‚½ã‚±ãƒƒãƒˆã§ã‚ã‚Œã€close()ã‚·ã‚¹ãƒ†ãƒ ã‚³ãƒ¼ãƒ«ã‚’å…ˆã«å‘¼ã³å‡ºã—ãŸå´ï¼ˆactive closingï¼‰ãŒæœ€çµ‚çš„ã«ãã†ãªã‚Š
mapk0y 2025/01/15
linux

network

kernel
ãƒªãƒ³ã‚¯
ç¬¬843å›žã€€Ubuntuã§NVMe over TCPã‚’è©¦ã™ | gihyo.jp
åŽ»ã‚‹10æœˆã«Ubuntu Discourseã«ã¦NVMe/TCPã‚’ä½¿ã„ä»®æƒ³ãƒžã‚·ãƒ³ã‚’ã‚¹ãƒˆãƒ¬ãƒ¼ã‚¸ãƒ¬ã‚¹ã§Ubuntu Server 24.10ã‚’ãƒ–ãƒ¼ãƒˆã™ã‚‹ã¨ã„ã†Proof of Conceptï¼ˆPoCï¼‰ãƒ‡ãƒ¢ãŒç´¹ä»‹ã•ã‚Œã¾ã—ãŸã€‚NVMe/TCPã¯2024å¹´3æœˆ8æ—¥ã®Ubuntu Weekly Topicsã§ã‚‚ç´¹ä»‹ã•ã‚Œã¦ã„ã‚‹ã‚ˆã†ã«ã€ŒiSCSIã®å¾Œç¶™ã€ã¨ã„ãˆã‚‹ã‚‚ã®ã§ã™ã€‚ ã“ã®PoCã«ã¤ã„ã¦ã¯ã€å®Ÿéš›ã«è©¦ã›ã‚‹ã‚¹ã‚¯ãƒªãƒ—ãƒˆç¾¤ãŒGitHubã®nvme-tcp-pocãƒ¬ãƒã‚¸ãƒˆãƒªï¼ˆä»¥ä¸‹ã€PoCãƒ¬ãƒã‚¸ãƒˆãƒªï¼‰ã§å…¬é–‹ã•ã‚Œã¦ã„ã¾ã™ã€‚ã“ã‚Œã‚’ä½¿ãˆã°ã€ãƒãƒƒãƒˆãƒ¯ãƒ¼ã‚¯ã®æ§‹æˆã‹ã‚‰ä»®æƒ³ãƒžã‚·ãƒ³ã®ã‚»ãƒƒãƒˆã‚¢ãƒƒãƒ—ã€Ubuntu Serverã®ã‚¤ãƒ³ã‚¹ãƒˆãƒ¼ãƒ«ã‚„UEFIã®è¨å®šã¾ã§ã»ã¨ã‚“ã©è‡ªå‹•ã§æ¸ˆã‚“ã§ã—ã¾ã„ã¾ã™ã€‚ã¤ã¾ã‚Šã€å‹•ã‹ã—ã¦ã¿ã‚‹ã ã‘ãªã‚‰PoCãƒ¬ãƒã‚¸ãƒˆãƒªã®æ¡ˆå†…ã«å¾“ãˆã°ï¼ˆã‚ã¾ã‚Šå•é¡Œã«éé‡ã™ã‚‹ã“ã¨ãªãï¼‰å®Ÿç¾ã§ãã¾ã™ã€‚ ã§ã‚‚ã€ãã‚Œã§ã¯ã€Œãªã‚“ã¨ãªãå‹•ã„ãŸã“ã¨ã¯
mapk0y 2024/12/19
kernel
ãƒªãƒ³ã‚¯
åˆ©ããƒ—ãƒã‚»ã‚¹ã‚¹ã‚±ã‚¸ãƒ¥ãƒ¼ãƒ©
kernel/vmæŽ¢æ¤œéšŠpart7ã®ç™ºè¡¨ã‚¹ãƒ©ã‚¤ãƒ‰ã§ã™ã€‚ https://kernelvm.connpass.com/event/330079/ ä»¥ä¸‹å†æ¼”å‹•ç”»ã®ãƒ†ã‚ã‚¹ãƒˆã§ã‚‚ã‚ã‚Šã¾ã™ã€‚ https://youtu.be/kJzG-o0_m24
mapk0y 2024/11/11
kernel
ãƒªãƒ³ã‚¯
Several Linux Kernel Driver Maintainers Removed Due To Their Association To Russia - Phoronix
Several Linux Kernel Driver Maintainers Removed Due To Their Association To Russia Written by Michael Larabel in Linux Kernel on 22 October 2024 at 02:22 PM EDT. 200 Comments Quietly merged into this week's Linux 6.12-rc4 kernel was a patch that removes a number of kernel maintainers from being noted in the official MAINTAINERS file that recognizes all of the driver and subsystem maintainers. Sent
mapk0y 2024/10/24
linux

kernel
ãƒªãƒ³ã‚¯
Linux Pipes are Slow - Quentin Santos
Errata: Some significant mistakes were pointed out to me by em ail by Brendan MacDonell. I have included errata, but the results might not be reliable, so take this with pinch of salt! vmsplice is too fast Some programs use a particular system call â€œvmspliceâ€ to move data faster through a pipe. Francesco already did a deep dive on using vmsplice to make things fast. However, while experimenting wit
mapk0y 2024/08/28
linux

kernel

performance
ãƒªãƒ³ã‚¯
Linux Kernel: PSI - Pressure Stall Information /proc/pressure/memory ã§ ãƒ¡ãƒ¢ãƒªã®ã‚¹ãƒˆãƒ¼ãƒ«ã‚’è¦³å¯Ÿã™ã‚‹ - hibomaã®æ—¥è¨˜
ä¸‹è¨˜ã®ç¶šãã‚¨ãƒ³ãƒˆãƒªã§ã™ hiboma.hatenadiary.jp ä»Šå›žã¯ PSI - Pressure Stall Information ã® /proc/pressure/memory ã«ã¤ã„ã¦ã®ã‚¨ãƒ³ãƒˆãƒª PSI ã‚’ä½¿ã†ã¨ CPU, ãƒ¡ãƒ¢ãƒª, IO ã§ stall ã—ãŸæ™‚é–“(å‰²åˆ) ã‚’è¨ˆæ¸¬ã§ãã‚‹ã£ã¦ãªã“ã¨ã§ã™ãŒã€ã©ã†ã„ã£ãŸå®Ÿè£…ã§ã€Œmemory stall = ãƒ¡ãƒ¢ãƒªã®ã‚¹ãƒˆãƒ¼ãƒ«ã€ã‚’èµ·ã“ã—ã¦ã„ã‚‹ã‚¿ã‚¹ã‚¯ã‚’è¨ˆæ¸¬ã—ã¦ã„ã‚‹ã®ã‹ã‹ãŒç–‘å•ã§èª¿ã¹ã¦ã„ã¾ã—ãŸ PSI ã®ãƒ‰ã‚ãƒ¥ãƒ¡ãƒ³ãƒˆ www.kernel.org æ£ç›´ã€ãƒ‰ã‚ãƒ¥ãƒ¡ãƒ³ãƒˆã‚’èªã‚“ã ã ã‘ã§ã¯ /proc/pressure/memory ãŒã©ã†ã„ã£ãŸã‚¿ã‚¤ãƒŸãƒ³ã‚°ã§è¨ˆä¸Šã•ã‚Œã‚‹ã®ã‹åˆ†ã‹ã‚Šã¾ã›ã‚“ã§ã—ãŸ. ã‚½ãƒ¼ã‚¹ã‚’èªã‚€ www.kernel.org ./kernel/sched/psi.c ã‚’ã–ãƒ¼ã£ã¨å‘¼ã‚“ã§ã„ã£ã¦ psi_memstall_enter() ã¨ p
mapk0y 2024/07/17
kernel
ãƒªãƒ³ã‚¯
æ–°Linuxã‚«ãƒ¼ãƒãƒ«è§£èªå®¤ - ã‚½ã‚±ãƒƒãƒˆã‚¤ãƒ³ã‚¿ãƒ¼ãƒ•ã‚§ãƒ¼ã‚¹(ãƒ‡ãƒ¼ã‚¿æ§‹é€ ã¨æ¦‚è¦ç·¨) - VA Linux ã‚¨ãƒ³ã‚¸ãƒ‹ã‚¢ãƒ–ãƒã‚°
ã€ŒLinuxã‚«ãƒ¼ãƒãƒ«2.6è§£èªå®¤ã€ï¼ˆä»¥é™ã€æ—§ç‰ˆï¼‰å‡ºç‰ˆå¾Œã€Linuxã«ã¯å¤šãã®æ©Ÿèƒ½ãŒè¿½åŠ ã•ã‚Œã€ã‚¨ãƒ³ã‚¿ãƒ¼ãƒ—ãƒ©ã‚¤ã‚ºé ˜åŸŸã‚’ã¯ã˜ã‚ã¨ã™ã‚‹æ§˜ã€…ãªå ´æ‰€ã§ä½¿ã‚ã‚Œã‚‹ã‚ˆã†ã«ãªã‚Šã¾ã—ãŸã€‚ ãã‚Œã«ä¼´ã„ã‚³ãƒ¼ãƒ‰ãŒè‚¥å¤§ã‹ã¤è¤‡é›‘åŒ–ã—ã€å¤šãã®ã‚¨ãƒ³ã‚¸ãƒ‹ã‚¢ã«ã¨ã£ã¦è§£èªä¸èƒ½ãªãƒ–ãƒ©ãƒƒã‚¯ãƒœãƒƒã‚¯ã‚¹ã¨ãªã£ã¦ã„ã¾ã™ã€‚ ä¸–ç•Œä¸ã®ãƒˆãƒƒãƒ—ã‚¨ãƒ³ã‚¸ãƒ‹ã‚¢é”ã®å‚‘ä½œã§ã‚ã‚‹Linuxã‚«ãƒ¼ãƒãƒ«ã«ãƒ¡ã‚¹ã‚’å…¥ã‚Œã€ãƒ–ãƒ©ãƒƒã‚¯ãƒœãƒƒã‚¯ã‚¹ã‚’ã“ã˜é–‹ã‘ã¦ã€æ™‚ã«å¥½å¥‡å¿ƒã®èµ´ãã¾ã¾ã«ã‚«ãƒ¼ãƒãƒ«ã®ä¸–ç•Œã‚’è§£èªã™ã‚‹ã€Œæ–°Linuxã‚«ãƒ¼ãƒãƒ«è§£èªå®¤ã€ãƒ—ãƒã‚¸ã‚§ã‚¯ãƒˆã€‚ æœ¬ç¨¿ã§ã¯ã€æ—§ç‰ˆç¬¬21ç« ã§è§£èª¬ã•ã‚Œã¦ã„ãŸã‚½ã‚±ãƒƒãƒˆã‚¤ãƒ³ã‚¿ãƒ¼ãƒ•ã‚§ãƒ¼ã‚¹ã«ã¤ã„ã¦ã€ã‚«ãƒ¼ãƒãƒ«v6.8ã®ã‚³ãƒ¼ãƒ‰ã‚’ãƒ™ãƒ¼ã‚¹ã«ä¸»ã«ãƒ‡ãƒ¼ã‚¿æ§‹é€ ã‚’ä¸å¿ƒã«è§£èª¬ã—ã¾ã™ã€‚ ã¯ã˜ã‚ã« ã‚½ã‚±ãƒƒãƒˆã®å®Ÿä½“ã¨æ¦‚è¦ ã‚½ã‚±ãƒƒãƒˆæ“ä½œé–¢æ•°ã®å®Ÿè£… ãƒ•ã‚¡ã‚¤ãƒ«æ“ä½œé–¢æ•°ã«ã‚ˆã‚‹ã‚½ã‚±ãƒƒãƒˆæ“ä½œã®å®Ÿè£… æ¬¡å›žäºˆå‘Š: ã‚½ã‚±ãƒƒãƒˆç”Ÿæˆç·¨ åŸ·ç†è€… : é ˆç”° å“²å¿—ã€ç¨²è‘‰ è²´æ˜ â€» ã€Œæ–°Linuxã‚«ãƒ¼ãƒãƒ«è§£èªå®¤ã€
mapk0y 2024/06/30
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linux

kernel
ãƒªãƒ³ã‚¯
æ–°Linuxã‚«ãƒ¼ãƒãƒ«è§£èªå®¤ - ã‚½ãƒ•ãƒˆå‰²ã‚Šè¾¼ã¿å‡¦ç† - VA Linux ã‚¨ãƒ³ã‚¸ãƒ‹ã‚¢ãƒ–ãƒã‚°
ã€ŒLinuxã‚«ãƒ¼ãƒãƒ«2.6è§£èªå®¤ã€ï¼ˆä»¥é™ã€æ—§ç‰ˆï¼‰å‡ºç‰ˆå¾Œã€Linuxã«ã¯å¤šãã®æ©Ÿèƒ½ãŒè¿½åŠ ã•ã‚Œã€ã‚¨ãƒ³ã‚¿ãƒ¼ãƒ—ãƒ©ã‚¤ã‚ºé ˜åŸŸã‚’ã¯ã˜ã‚ã¨ã™ã‚‹æ§˜ã€…ãªå ´æ‰€ã§ä½¿ã‚ã‚Œã‚‹ã‚ˆã†ã«ãªã‚Šã¾ã—ãŸã€‚ ãã‚Œã«ä¼´ã„ã‚³ãƒ¼ãƒ‰ãŒè‚¥å¤§ã‹ã¤è¤‡é›‘åŒ–ã—ã€å¤šãã®ã‚¨ãƒ³ã‚¸ãƒ‹ã‚¢ã«ã¨ã£ã¦è§£èªä¸èƒ½ãªãƒ–ãƒ©ãƒƒã‚¯ãƒœãƒƒã‚¯ã‚¹ã¨ãªã£ã¦ã„ã¾ã™ã€‚ ä¸–ç•Œä¸ã®ãƒˆãƒƒãƒ—ã‚¨ãƒ³ã‚¸ãƒ‹ã‚¢é”ã®å‚‘ä½œã§ã‚ã‚‹Linuxã‚«ãƒ¼ãƒãƒ«ã«ãƒ¡ã‚¹ã‚’å…¥ã‚Œã€ãƒ–ãƒ©ãƒƒã‚¯ãƒœãƒƒã‚¯ã‚¹ã‚’ã“ã˜é–‹ã‘ã¦ã€æ™‚ã«å¥½å¥‡å¿ƒã®èµ´ãã¾ã¾ã«ã‚«ãƒ¼ãƒãƒ«ã®ä¸–ç•Œã‚’è§£èªã™ã‚‹ã€Œæ–°Linuxã‚«ãƒ¼ãƒãƒ«è§£èªå®¤ã€ãƒ—ãƒã‚¸ã‚§ã‚¯ãƒˆã€‚ æœ¬ç¨¿ã§ã¯ã€æ—§ç‰ˆç¬¬3ç« ã§è§£èª¬ã•ã‚Œã¦ã„ãŸã‚½ãƒ•ãƒˆå‰²ã‚Šè¾¼ã¿å‡¦ç†ã«ã¤ã„ã¦ã€ã‚«ãƒ¼ãƒãƒ«v6.8/arm64ã®ã‚³ãƒ¼ãƒ‰ã‚’ãƒ™ãƒ¼ã‚¹ã«è§£èª¬ã—ã¾ã™ã€‚ ã¯ã˜ã‚ã« å‰²ã‚Šè¾¼ã¿ç¦æ¢åŒºé–“ã¨å¿œç”æ€§ã«ã¤ã„ã¦ perfã«ãŠã‘ã‚‹NMIå‰²ã‚Šè¾¼ã¿ã‹ã‚‰è¦‹ã‚‹å¿œç”æ€§ ã‚½ãƒ•ãƒˆå‰²ã‚Šè¾¼ã¿å‡¦ç† ã‚½ãƒ•ãƒˆå‰²ã‚Šè¾¼ã¿å‡¦ç†ã®è€ƒãˆæ–¹ ã‚½ãƒ•ãƒˆå‰²ã‚Šè¾¼ã¿å®Ÿè¡Œã¾ã§ã®æµã‚Œ ã‚½ãƒ•ãƒˆå‰²ã‚Šè¾¼ã¿è¦æ±‚ï¼ˆRCU_SOFTIRQã®å ´
mapk0y 2024/06/30
ã‚ã¨ã§èªã‚€

kernel

linux
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GitHub - mmcshane/salp: USDT probes in Golang on Linux
mapk0y 2024/06/30
ã‚ã¨ã§èªã‚€

eBPF

kernel
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GitHub - a13xp0p0v/kernel-hardening-checker: A tool for checking the security hardening options of the Linux kernel
$ ./bin/kernel-hardening-checker -a [+] Going to autodetect and check the security hardening options of the running kernel [+] Detected version of the running kernel: (6, 5, 0) [+] Detected kconfig file of the running kernel: /boot/config-6.5.0-1025-azure [+] Detected cmdline parameters of the running kernel: /proc/cmdline [+] Saved sysctl output to /tmp/sysctl-n7hd4ab2 [+] Detected microarchitect
mapk0y 2024/03/06
kernel

security
ãƒªãƒ³ã‚¯
Maestro - Introduction
2024-01-02T15:00:00+00:00 Maestro is a Unix-like kernel and operating system written from scratch in Rust Thanks to the internet, I can learn how most things I am interested in work. However, something stayed a mystery to me for a long time: computers. Computers are amongst the most complex tools that humanity has ever built. They are a marvel of engineering that we take for granted because we use
mapk0y 2024/01/05
kernel

rust
ãƒªãƒ³ã‚¯
ç¬¬793å›žã€€è‡ªä½œã®ã‚«ãƒ¼ãƒãƒ«ãƒ¢ã‚¸ãƒ¥ãƒ¼ãƒ«ã‚’Rustã§ä½œã‚‹ | gihyo.jp
ç¬¬791å›žã§ã¯åŸºæœ¬çš„ãªã‚«ãƒ¼ãƒãƒ«ãƒ¢ã‚¸ãƒ¥ãƒ¼ãƒ«ã®ä½œã‚Šæ–¹ã¨ãã‚Œã‚’DKMSã«å¯¾å¿œã•ã›ã‚‹æ–¹æ³•ã‚’ç´¹ä»‹ã—ã¾ã—ãŸã€‚ä»Šå›žã¯ã‚«ãƒ¼ãƒãƒ«ã®æ–°ã—ã„æ©Ÿèƒ½ã®ã²ã¨ã¤ã§ã‚ã‚‹ã€ŒRustã§ã‚«ãƒ¼ãƒãƒ«ãƒ¢ã‚¸ãƒ¥ãƒ¼ãƒ«ã‚’ä½œã‚‹æ–¹æ³•ã€ã‚’ç´¹ä»‹ã—ã¾ã—ã‚‡ã†ã€‚ Ubuntuã‚«ãƒ¼ãƒãƒ«ã«ãŠã‘ã‚‹Rustã®å¯¾å¿œ Linuxã‚«ãƒ¼ãƒãƒ«ã§ã¯ã€Kernel 6.1ã‹ã‚‰ãƒ—ãƒã‚°ãƒ©ãƒŸãƒ³ã‚°è¨€èªžã§ã‚ã‚‹ã€ŒRustã€ã®æ©Ÿèƒ½ãŒå–ã‚Šè¾¼ã¾ã‚Œã¾ã—ãŸã€‚ã“ã‚Œã¯ã€ŒRust for Linuxã€ã®æˆæžœã§ã€ã‚«ãƒ¼ãƒãƒ«ã®æ©Ÿèƒ½ã‚’Cè¨€èªžã‚„ã‚¢ã‚»ãƒ³ãƒ–ãƒ©ã ã‘ã§ãªãã€Rustã§ã‚‚æ›¸ã‘ã‚‹ã‚ˆã†ã«ã™ã‚‹ã¨ã„ã†ã‚‚ã®ã§ã™ã€‚ãƒ¡ãƒ¢ãƒªãƒ¼å®‰å…¨æ€§ã‚„å¼·ã„é™çš„åž‹ä»˜ã‘ãªã©ã®ç‰¹å¾´ã‚’å–ã‚Šè¾¼ã‚€ã“ã¨ã§ã€ã‚«ãƒ¼ãƒãƒ«ã®ã‚»ã‚ãƒ¥ãƒªãƒ†ã‚£å•é¡Œã®åŽŸå› ã®å¤šãã‚’å ã‚ã‚‹ãƒ¡ãƒ¢ãƒªãƒ¼é–¢é€£ã®ä¸å…·åˆã«å¯¾ã—ã¦ã€ä¸€ç¨®ã®å¯¾ç–ã«ãªã‚‹ã“ã¨ãŒæœŸå¾…ã•ã‚Œã¾ã™ã€‚ ã‚ã‚‰ã‚†ã‚‹ã‚±ãƒ¼ã‚¹ã«ãŠã„ã¦Rustã«ç½®ãæ›ãˆã‚‰ã‚Œã‚‹ã¨ã„ã†ã‚ã‘ã§ã¯ã‚ã‚Šã¾ã›ã‚“ãŒã€ä»Šå¾Œã‚«ãƒ¼ãƒãƒ«ã®ã‚³ãƒ¼ãƒ‰ã‚’èªã¿æ›¸ãã™ã‚‹ä¸Šã§Cè¨€èªžã‚„ã‚¢ã‚»ãƒ³ãƒ–ãƒ©ã ã‘ã§ãª
mapk0y 2023/12/21
kernel

rust
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linux kernelã§ã®FPU, MMX, SSEã«ã¤ã„ã¦ - ç§ã®ã²ã‚‰ã‚ãæ—¥è¨˜
linux kernelã§ã®FPU, MMX, SSEã«ã¤ã„ã¦ æœ¬è¨˜äº‹ã§ã¯ã€linux kernel 2.6.11ã§ã®FPU(Float Point Unit)ã‚„MMX, SSEãŒã©ã†è¨å®šã€ä½¿ç”¨ã•ã‚Œã¦ã„ã‚‹ã®ã‹ã‚’ç¢ºèªã™ã‚‹ã€‚FPU, MMX SSEå‘½ä»¤ã‚’ä½¿ç”¨ã™ã‚‹éš›ã¯ã€ä½¿ç”¨ã™ã‚‹éš›ã«æ„å›³çš„ã«#NM(Interrupt7: Device not available exception)ã‚’å‡ºã—ã€å„ç¨®ãƒ•ãƒ©ã‚°ã‚’åˆ‡ã‚Šæ›¿ãˆ(ç‰¹ã«cr0.TS flagã‚’OFFã«ã—ã¦)ã€ã“ã‚Œã‚‰ã®å‘½ä»¤ã‚’ä½¿ãˆã‚‹ã‚ˆã†ã«ã—ã¦ã„ã‚‹ã€‚(å¾Œè¿°ã®é€šã‚Šã€Kernel Modeã§ã¯ã€kernel_fpu_begin, kernel_fpu_endã«ã¦ãƒ•ãƒ©ã‚°ã®åˆ‡ã‚Šæ›¿ãˆã‚’ãŠã“ãªã£ã¦ã„ã‚‹1ãŸã‚ã€ã“ã®é™ã‚Šã§ãªã„ã€‚) ãƒ—ãƒã‚°ãƒ©ãƒŸãƒ³ã‚°è¨€èªžã®ä¾‹å¤–å‡¦ç†ã¯ãƒ‘ãƒ•ã‚©ãƒ¼ãƒžãƒ³ã‚¹ã‚’è½ã¨ã™ã‚‚ã®ã¨ã—ã¦ä¸€èˆ¬ã«å«Œã‚ã‚Œã¦ã„ã‚‹ãŒã€ãƒãƒ¼ãƒ‰ã‚¦ã‚§ã‚¢(ã“ã®å ´åˆx86)ã®ãƒ¬ã‚¤ãƒ¤ã§ã¯ã€ä¾‹å¤–ã‚’ã‚ãˆã¦æ„
mapk0y 2023/11/27
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kernel
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How does the Linux Kernel start a Process
...and how to ptrace the entry point and m3ss w1th da stack. In this article, you will learn what happens inside the Linux Kernel when a process calls execve(), how the Kernel prepares the stack and how control is then passed to the userland process for execution. I had to learn this for the development of Zapper - a Linux tool to delete all command line options from any process (without needing r
mapk0y 2023/09/18
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Inferã§Linuxã‚«ãƒ¼ãƒãƒ«ã®ãƒ¡ãƒ¢ãƒªé–¢é€£ã‚¨ãƒ©ãƒ¼ã‚’æ¤œå‡ºã—ã¦ã¿ã‚‹ - VA Linux ã‚¨ãƒ³ã‚¸ãƒ‹ã‚¢ãƒ–ãƒã‚°
1. é™çš„ã‚³ãƒ¼ãƒ‰è§£æž 2. Infer 3. èª¿æŸ»ç’°å¢ƒ 4. Inferã®ãƒ“ãƒ«ãƒ‰ 5. Inferã§è§£æžã§ãã‚‹ã‚ˆã†ã«Linuxã‚«ãƒ¼ãƒãƒ«ã‚½ãƒ¼ã‚¹ã‚³ãƒ¼ãƒ‰ã«å°‘ã—ä¿®æ£ã‚’åŠ ãˆã‚‹ 6. Linuxã‚«ãƒ¼ãƒãƒ«ã‚½ãƒ¼ã‚¹ã‚³ãƒ¼ãƒ‰ã‚’Inferã§æ¤œè¨¼ 7. è§£æžçµæžœã«å¯¾ã™ã‚‹ç²¾æŸ»ã®ä¸€ä¾‹ 7.1. çœŸã®ãƒã‚°ã®ä¾‹ 7.2. ãƒ•ã‚©ãƒ¼ãƒ«ã‚¹ãƒã‚¸ãƒ†ã‚£ãƒ–ã®ä¾‹ 7.3. çœŸã®ãƒã‚°ã‹åˆ¤æ–ã«å›°ã‚‹ã‚‚ã®ã®ä¾‹ 8. çµè«–ã¨ã“ã‚Œã‹ã‚‰ åŸ·ç†è€… : å²¡éƒ¨ ç©¶ 1. é™çš„ã‚³ãƒ¼ãƒ‰è§£æž æ™®æ®µã®é–‹ç™ºã§å“è³ªå‘ä¸Šã•ã›ã‚‹ãŸã‚ã«ã©ã®ã‚ˆã†ãªæ‰‹æ³•ã‚’æŽ¡ç”¨ã•ã‚Œã¦ã„ã‚‹ã§ã—ã‚‡ã†ã‹ã€‚ãŠãã‚‰ããƒ¦ãƒ‹ãƒƒãƒˆãƒ†ã‚¹ãƒˆã‚„çµåˆãƒ†ã‚¹ãƒˆã‚’ä»£è¡¨ã™ã‚‹ãƒ†ã‚¹ãƒˆã‚’ä½¿ã£ã¦ã„ã‚‹ã®ã§ã¯ãªã„ã§ã—ã‚‡ã†ã‹ã€‚ ã“ã®ãƒ†ã‚¹ãƒˆæ‰‹æ³•ã¯ç¾å®Ÿçš„ã§ã™ãŒã–ã£ã¨æŒ™ã’ã‚‹ã ã‘ã§ã‚‚ä»¥ä¸‹ã®èª²é¡ŒãŒã‚ã‚Šã¾ã™: å…¥åŠ›ã¨å‡ºåŠ›ã‚’ãƒ†ã‚¹ãƒˆã‚±ãƒ¼ã‚¹ã¨å‘¼ã°ã‚Œã‚‹ä¾‹ã¨ã—ã¦ä¸Žãˆã‚‹ã®ã§å…¨ã¦ã®å ´åˆã‚’ç¶²ç¾…ã™ã‚‹ã“ã¨ã¯ä¸å¯èƒ½ ãƒ†ã‚¹ãƒˆã®ç¶²ç¾…çŽ‡ã‚’ä¸Šã’ã‚‹ã«ã¯ãƒ¦ãƒ‹ãƒƒãƒˆãƒ†ã‚¹ãƒˆã®ã‚ˆã†ãªå°ã•ã„å˜ä½ã§
mapk0y 2023/08/07
linux

kernel
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Linuxã‚«ãƒ¼ãƒãƒ«ã«é‡å¤§ãªè„†å¼±æ€§ã€ŒStackRotã€ã€ãŸã ã¡ã«ç¢ºèªã‚’
The Hacker Newsã¯7æœˆ6æ—¥(ç¾åœ°æ™‚é–“)ã€ã€ŒResearchers Uncover New Linux Kernel 'StackRot' Privilege Escalation Vulnerabilityã€ã«ãŠã„ã¦ã€Linuxã‚«ãƒ¼ãƒãƒ«ã«æ·±åˆ»ãªè„†å¼±æ€§ãŒç™ºè¦‹ã•ã‚ŒãŸã¨ä¼ãˆãŸã€‚æ–°ãŸã«è¦‹ã¤ã‹ã£ãŸè„†å¼±æ€§ã¯ã€ŒStackRotã€ã¨åä»˜ã‘ã‚‰ã‚Œã¦ãŠã‚Šã€ç¾æ™‚ç‚¹ã§ã¯ã“ã®æ¬ é™¥ãŒæ‚ªç”¨ã•ã‚ŒãŸå½¢è·¡ã¯ãªã„ã¨å ±å‘Šã—ã¦ã„ã‚‹ã€‚ StackRotã¯ã€Œ CVE-2023-3269ã€ã¨ã—ã¦è¿½è·¡ã•ã‚Œã¦ã„ã‚‹Linuxã‚«ãƒ¼ãƒãƒ«ã®è„†å¼±æ€§ã€‚Linuxã®ãƒãƒ¼ã‚¸ãƒ§ãƒ³6.1ã‹ã‚‰6.4ã«å½±éŸ¿ã‚’ä¸Žãˆã‚‹å¯èƒ½æ€§ãŒã‚ã‚Šã€Red Hat Customer Portalã«ã‚ˆã‚‹å…±é€šè„†å¼±æ€§è©•ä¾¡ã‚·ã‚¹ãƒ†ãƒ (CVSS: Common Vulnerability Scoring System)v3ã®ã‚¹ã‚³ã‚¢å€¤ã§ã¯7.8ã¨åˆ†é¡žã•ã‚Œã€æ·±åˆ»åº¦ã¯é‡è¦(High)ã¨è©•ä¾¡ã•
mapk0y 2023/07/11
kernel

security
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[Ubuntu] Rustã§Linux kernel ãƒ¢ã‚¸ãƒ¥ãƒ¼ãƒ«ã‚’é–‹ç™ºã™ã‚‹ | DevelopersIO
Introduction Linux kernelã®6.2ã‹ã‚‰Rustã§ã‚«ãƒ¼ãƒãƒ«é–‹ç™ºã‚’ã™ã‚‹ãŸã‚ã®åŸºæœ¬çš„ãªã‚µãƒãƒ¼ãƒˆãŒå°Žå…¥ã•ã‚Œã¾ã—ãŸãŒã€ ãƒ¡ã‚¸ãƒ£ãƒ¼ãªãƒ‡ã‚£ã‚¹ãƒˆãƒªãƒ“ãƒ¥ãƒ¼ã‚·ãƒ§ãƒ³ã¯6.2ã‚’ãƒ‡ãƒ•ã‚©ãƒ«ãƒˆã§æè¼‰ã—ã¦ã„ã¾ã›ã‚“ã§ã—ãŸã€‚ ãªã®ã§Rustã‚«ãƒ¼ãƒãƒ«ã‚’è©¦ãã†ã¨ã—ãŸå ´åˆã€ ã‚«ãƒ¼ãƒãƒ«ã®ã‚½ãƒ¼ã‚¹æŒã£ã¦ãã¦ã‚«ãƒ¼ãƒãƒ«ãƒ“ãƒ«ãƒ‰é–¢é€£ã®ã‚½ãƒ•ãƒˆã‚¦ã‚§ã‚¢ã‚„ãƒ©ã‚¤ãƒ–ãƒ©ãƒªã‚’ã‚¤ãƒ³ã‚¹ãƒˆãƒ¼ãƒ«ã—ã€ Rusté–¢é€£ã®ã‚ªãƒ—ã‚·ãƒ§ãƒ³ã¤ã‘ã¦ãƒ“ãƒ«ãƒ‰ã—ãªãŠã—ã¦ Rustã§æ›¸ã„ãŸã‚«ãƒ¼ãƒãƒ«ãƒ¢ã‚¸ãƒ¥ãƒ¼ãƒ«ã‚’ãƒ“ãƒ«ãƒ‰ã—ã¦ QEMUã¨ã‹UTMã¨ã‹ã§ã‚ˆã†ã‚„ãå‹•ä½œç¢ºèªãŒã§ãã¾ã™ã€‚ ã¨ã‚Šã‚ãˆãšHelloWorldã™ã‚‹ã ã‘ã§ã‚‚ã€ã‹ãªã‚Šé¢å€’ã§ã™ã€‚ ã—ã‹ã—å…ˆæ—¥ã€Ubuntu 23.04 â Lunar LobsterãŒãƒªãƒªãƒ¼ã‚¹ã•ã‚Œã¾ã—ãŸã€‚ ã“ã‚Œã¯æ¨™æº–ã§Linux Kernel 6.2ã‚’æè¼‰ã—ã¦ã„ã‚‹ã®ã§ã€é¢å€’ãªæ‰‹é †ã‚’è¸ã¾ãªãã¦ã‚‚ Rustè£½ã®Linux kernelãŒå‹•ãã¾ã™ã€‚ ã¾ãŸã€ç´ æ™´
mapk0y 2023/06/01
Makefile ã®æœ€åˆã« "NAME=hello_rust" ãŒå¿…è¦ãªæ°—ãŒã™ã‚‹

kernel

rust
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ReactJS: Keep Simple. Everything can be a component!
mapk0y 2023/05/26
kernel
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mapk0y 2023/05/26
kernel
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2022/08/28 Kernel/VMæŽ¢æ¤œéšŠonline part5 (https://kernelvm.connpass.com/event/256248/) ã® @nullpo_head (https://twitter.com/nullpo_head) ã®ç™ºè¡¨è³‡æ–™ã§ã™ã€‚ ptraceã‚’ä½¿ã£â€¦
mapk0y 2023/05/04
kernel

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