[B! kernel] shomah4aã®ãƒ–ãƒƒã‚¯ãƒžãƒ¼ã‚¯

shomah4a id:shomah4a

kernelã«é–¢ã™ã‚‹shomah4aã®ãƒ–ãƒƒã‚¯ãƒžãƒ¼ã‚¯ (5)

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sched_clock() overflow after 208.5 days in Linux Kernel
ãˆãƒ¼ã£ã¨ã€ä¹…ã—ã¶ã‚Šã« Linux Kernel ã«ãƒ€ãƒ¡ãƒ€ãƒ¡ãªãƒã‚°ãŒç™ºè¦‹ã•ã‚Œã¦ã€ã‚ˆã‚Šã«ã‚‚ã‚ˆã£ã¦ã†ã¡ã®è£½å“ã‚‚å½±éŸ¿ã‚’å—ã‘ãŸã®ã§ã€ã“ã“ã«è©³ç´°ã‚’æ›¸ãã“ã¨ã«ã—ãŸã€‚ ã¤ãƒ¼ã‹ã€‚æ–°ã—ã„ Kernel ã‚’ä½¿ã†ãªã‚‰çš†ã§ä½¿ãŠã†ã‚ˆã€‚ãªã‚“ã ã‚ˆãã®ã€Œ1ã¤ã ã‘ã€å½±éŸ¿ã‚’å—ã‘ã¦æ®‹ã‚Šã¯ã€Œå½±éŸ¿ã‚‚å—ã‘ãªã„ãã‚‰ã„å¤ã„ã€ã£ã¦ã®ã¯â€¦ æ¦‚è¦ å¤§é›‘æŠŠã« 208.5æ—¥é€£ç¶šé‹è»¢ã—ãŸ Linux Kernel ãŒçªå¦‚ã¨ã—ã¦ reboot ã™ã‚‹ã€‚ å®Ÿæ©Ÿã§ãªãŠã‹ã¤ Time Stamp Counter ã‚’å†…åŒ…ã—ã¦ã„ã‚‹å¿…è¦ãŒã‚ã‚‹ã®ã§ã€Pentium4ä»¥é™ã®ãƒ—ãƒã‚»ãƒƒã‚µ(ãŒã€ãã‚Œã¯ã‚ˆã†ã™ã‚‹ã«ä»Šã‚ã‚‹ Intel ç³»CPUå…¨éƒ¨)ã‹ã€ãã®äº’æ›CPUã§ã‚ã‚‹å¿…è¦ãŒã‚ã‚‹ã€‚32bit ãƒ¢ãƒ¼ãƒ‰ã€64bit ãƒ¢ãƒ¼ãƒ‰ã®åŒºåˆ¥ã¯ãªã„ã€‚ é€†ã« VMware ã‚„ Xen ãªã©ã€ä»®æƒ³ãƒžã‚·ãƒ³ä¸Šã§å‹•ã„ã¦ã„ã‚‹ kernel ã«å½±éŸ¿ã¯ãªã„ã€‚ã“ã‚Œã¯ãã‚‚ãã‚‚ãƒã‚°ã‚’å†…åŒ…ã—ãŸãƒ«ãƒ¼ãƒãƒ³ã‚’ã€ä»®æƒ³ãƒžã‚·ãƒ³ã§å‹•
shomah4a 2011/12/30
kernel

linux

ã“ã‚Œã¯ã²ã©ã„
ãƒªãƒ³ã‚¯
æ¸›ã‚Šç¶šã‘ã‚‹ãƒ¡ãƒ¢ãƒªæ®‹é‡ï¼ æžœãŸã—ã¦ãã®åŽŸå› ã¯!?
ç‰©ç†ãƒ¡ãƒ¢ãƒªä½¿ç”¨çŠ¶æ³ã®æŠŠæ¡ã«ã¯ä½•ã‚’ä½¿ã†ï¼Ÿ ã§ã¯ã€ã‚¹ãƒˆãƒ¬ãƒ¼ã‚¸ã¨ã®åŒæœŸæƒ…å ±ã¾ã§åŠ å‘³ã—ãŸãƒ¡ãƒ¢ãƒªã®ä½¿ç”¨çŠ¶æ³ç›£è¦–ã‚’è¡Œã†ã«ã¯ã€ã©ã†ã™ã‚Œã°ã‚ˆã„ã®ã§ã—ã‚‡ã†ã‹ï¼Ÿ å®Ÿã¯ç¾åœ¨ï¼ˆæ³¨2ï¼‰ã®ã¨ã“ã‚ã€ã€Œã“ã‚Œã§å®Œãºãã€ã¨ã„ã†æ–¹æ³•ã¯ã‚ã‚Šã¾ã›ã‚“ã€‚ãŸã ã€ãã‚Œã§ã¯å›°ã‚‹ã®ã§ã€ã“ã“ã§ã¯æ¬¡å–„ã®ç–ã¨ã—ã¦Activeã¨Inactiveã‚’ç›£è¦–ã™ã‚‹æ–¹æ³•ã‚’æŒ™ã’ã¾ã™ã€‚ Activeã¨Inactiveã¯vmstat -aã‚„cat /proc/meminfoãªã©ã¨å…¥åŠ›ã™ã‚‹ã“ã¨ã§å–å¾—ã§ãã¾ã™ï¼ˆå›³5ï¼‰ã€‚ Activeã¯ãƒšãƒ¼ã‚¸ã‚ãƒ£ãƒƒã‚·ãƒ¥ã‚„ç„¡åãƒšãƒ¼ã‚¸ï¼ˆæ³¨3ï¼‰ã®ã†ã¡ã€æœ€è¿‘åˆ©ç”¨ã—ãŸã‚Šã€ã¾ã ã‚¹ãƒˆãƒ¬ãƒ¼ã‚¸ã¨ã®åŒæœŸãŒå–ã‚Œã¦ã„ãªã„ã€Œæ¨ã¦ã‚‰ã‚Œãªã„ã€ãƒšãƒ¼ã‚¸ã§ã™ã€‚Inactiveã¯ã€åŒã˜ããƒšãƒ¼ã‚¸ã‚ãƒ£ãƒƒã‚·ãƒ¥ã‚„ç„¡åãƒšãƒ¼ã‚¸ã®ã†ã¡ã€æœ€å¾Œã«ã‚¢ã‚¯ã‚»ã‚¹ã•ã‚Œã¦ã‹ã‚‰ã‚ã‚‹ç¨‹åº¦æ™‚é–“ãŒãŸã¡ã€ã‚¹ãƒˆãƒ¬ãƒ¼ã‚¸ã¨ã®åŒæœŸã‚‚å®Œäº†ã—ã¦ã„ã¦ã€ã™ãã«æ¨ã¦ã‚‰ã‚Œã‚‹ãƒšãƒ¼ã‚¸ã§ã™ã€‚ã‚ˆã£ã¦ã€/proc/meminfoã®å‡ºåŠ›ã§ã„ã†ã¨ã“ã‚
shomah4a 2011/02/14
drop_caches ãªã‚“ã¦ã‚ã‚‹ã®ã‹

linux

kernel

memory
ãƒªãƒ³ã‚¯
linux ã®ã‚·ã‚¹ãƒ†ãƒ ã‚³ãƒ¼ãƒ«ã‚’ãƒ•ãƒƒã‚¯ã™ã‚‹ : DSASé–‹ç™ºè€…ã®éƒ¨å±‹
æœ€è¿‘ã€ã¨ã‚ã‚‹ã‚¯ãƒãƒ¼ã‚ºãƒ‰ã‚½ãƒ¼ã‚¹ãªãƒ‡ãƒã‚¤ã‚¹ç®¡ç†ãƒ„ãƒ¼ãƒ«ã®æŒ™å‹•ãŒæ°—ã«ãªã‚Šã€ãã®å‹•ä½œã«ã¤ã„ã¦è§£æžã—ã¦ã¿ã‚‹ã“ã¨ã«ã—ã¾ã—ãŸã€‚ ãƒ—ãƒã‚°ãƒ©ãƒ ã‚’ãƒ‡ãƒãƒƒã‚°ã—ãŸã‚Šè§£æžã—ãŸã„æ™‚ã€ã©ã‚“ãªã‚·ã‚¹ãƒ†ãƒ ã‚³ãƒ¼ãƒ«ãŒå‘¼ã°ã‚Œã€ã©ã®ã‚ˆã†ãªå¼•æ•°ãŒæ¸¡ã•ã‚Œã¦ã„ã‚‹ã‹ã‚’ã€èª¿ã¹ã‚‹ã“ã¨ãŒã§ãã‚‹ strace ã¯éžå¸¸ã«æœ‰ç”¨ã§ã™ã€‚ ã—ã‹ã—ã€strace ã§ã¯ ioctl ã§æ¸¡ã•ã‚Œã‚‹è¤‡é›‘ãªãƒ‡ãƒ¼ã‚¿æ§‹é€ ã‚’è¡¨ç¤ºã™ã‚‹ã“ã¨ã¯ã§ããªã„ãŸã‚ã€ã‚·ã‚¹ãƒ†ãƒ ã‚³ãƒ¼ãƒ«ã‚’ãƒ•ãƒƒã‚¯ã—ã¦å¼•æ•°ã‚’è¡¨ç¤ºã™ã‚‹ã¨ã„ã†æ‰‹æ®µã‚’å–ã‚‹ã“ã¨ã«ã—ã¾ã—ãŸã€‚ ãã‚“ãªè¨³ã§ linux ã§ã‚·ã‚¹ãƒ†ãƒ ã‚³ãƒ¼ãƒ«ã‚’ãƒ•ãƒƒã‚¯ã™ã‚‹æ–¹æ³•ã«ã¤ã„ã¦èª¿ã¹ã¦è¦‹ãŸã¨ã“ã‚ã€æ„å¤–ã¨ã„ã‚ã„ã‚ãªæ–¹æ³•ãŒæœ‰ã‚‹ã“ã¨ã‚’çŸ¥ã‚Šã¾ã—ãŸã®ã§ã€è©¦ã—ã¦ã¿ãŸæ–¹æ³•ã‚’å¹¾ã¤ã‹ç´¹ä»‹ã—ãŸã„ã¨æ€ã„ã¾ã™ã€‚ æ³¨)ä»Šå›žã®å®Ÿé¨“ã«ä½¿ç”¨ã—ãŸ linux kernel ã®ãƒãƒ¼ã‚¸ãƒ§ãƒ³ã¯ 2.6.25.11 ã§ã™ã€‚ç•°ãªã‚‹ãƒãƒ¼ã‚¸ãƒ§ãƒ³ã§ã¯ã“ã®å®Ÿé¨“é€šã‚Šã«ã¯ãªã‚‰ãªã„å ´åˆãŒã‚ã‚Šã¾ã™ã€‚ LD_PRELOAD ã‚’ä½¿ã£
shomah4a 2011/01/25
linux

kernel

ã‚·ã‚¹ãƒ†ãƒ ã‚³ãƒ¼ãƒ«

hook
ãƒªãƒ³ã‚¯
Loadable Kernel Moduleã®ä½œã‚Šæ–¹ - ã¨ã¿ãžãƒ¼ãƒŽãƒ¼ãƒˆ
Linuxã®Loadable Kernel Moduleã®ä½œã‚Šæ–¹ã®HowToã€‚å¯¾è±¡ã®ã‚«ãƒ¼ãƒãƒ«ãƒãƒ¼ã‚¸ãƒ§ãƒ³ã¯2.6ã€‚ 1. Sourceã¨Makefile ã‚«ãƒ¼ãƒãƒ«ã«Load/Unloadã§ãã‚‹ã ã‘ã®å°ãƒ¢ã‚¸ãƒ¥ãƒ¼ãƒ«ã‚’ä½œã£ã¦ã¿ã‚‹ã€‚ä½•å‡¦ã‹é©å½“ãªãƒ‡ã‚£ãƒ¬ã‚¯ãƒˆãƒªã«ä»¥ä¸‹ã®ã‚ˆã†ã«ã‚½ãƒ¼ã‚¹ã¨Makefileã‚’ä½œã‚‹ã€‚ã‚½ãƒ¼ã‚¹ã¨Makefileã®ä¸èº«ã¯ä»¥ä¸‹ã‚’å‚ç…§ã€‚.tar.gzã«ã¾ã¨ã‚ãŸãƒ•ã‚¡ã‚¤ãƒ«ã¯ã“ã¡ã‚‰ã‹ã‚‰ã€‚ xxxxxx/ Makefile - Makefile small.c - ãƒ¢ã‚¸ãƒ¥ãƒ¼ãƒ«ã®ã‚½ãƒ¼ã‚¹ 1.1 Source ãƒ¢ã‚¸ãƒ¥ãƒ¼ãƒ«ã®ã‚½ãƒ¼ã‚¹ã‚³ãƒ¼ãƒ‰ã®ã‚µãƒ³ãƒ—ãƒ«ã‚’ä»¥ä¸‹ã«ç¤ºã™ã€‚ æœ€ä½Žé™å¿…è¦ãªã®ã¯ã€ãƒ¢ã‚¸ãƒ¥ãƒ¼ãƒ«ãŒLoadã•ã‚ŒãŸæ™‚ã«å‘¼ã³å‡ºã•ã‚Œã‚‹åˆæœŸåŒ–ãƒ«ãƒ¼ãƒãƒ³(smallmod_init_module())ã¨ãƒ¢ã‚¸ãƒ¥ãƒ¼ãƒ«ãŒUnloadã•ã‚Œã‚‹æ™‚ã«å‘¼ã³å‡ºã•ã‚Œã‚‹å¾Œå‡¦ç†ç”¨ãƒ«ãƒ¼ãƒãƒ³(smallmod_init_module())ã€‚ã“ã‚Œã‚‰ã®ãƒ«ãƒ¼
shomah4a 2011/01/25
kernel

linux

ã‚«ãƒ¼ãƒãƒ«
ãƒªãƒ³ã‚¯
Linux Kernel Hacking
ã‚·ã‚¹ãƒ†ãƒ ã‚³ãƒ¼ãƒ«ã®è¿½åŠ LKMã«ã‚ˆã‚‹ã‚·ã‚¹ãƒ†ãƒ ã‚³ãƒ¼ãƒ«ã®ãƒ•ãƒƒã‚¯ ã‚·ã‚¹ãƒ†ãƒ ã‚³ãƒ¼ãƒ«ã®åˆ¶é™ ã‚·ã‚¹ãƒ†ãƒ ã‚³ãƒ¼ãƒ«ã®è¿½åŠ å„ã‚·ã‚¹ãƒ†ãƒ ã‚³ãƒ¼ãƒ«ã¯ arch/i386/kernel/entry.S ã® system_callã¨ã„ã†é–¢æ•°ã‹ ã‚‰å‘¼ã°ã‚Œã‚‹ã€‚ãƒ¦ãƒ¼ã‚¶ãƒ—ãƒã‚°ãƒ©ãƒ ã‹ã‚‰ãƒ¬ã‚¸ã‚¹ã‚¿ã‚’ä½¿ã£ã¦æ¸¡ã•ã‚ŒãŸã‚·ã‚¹ãƒ†ãƒ ã‚³ãƒ¼ãƒ« ã¸ã®å¼•æ•°ã¯ã‚¹ã‚¿ãƒƒã‚¯ã«ç©ã¾ã‚Œã€ã‚·ã‚¹ãƒ†ãƒ ã‚³ãƒ¼ãƒ«ã‚’å®Ÿç¾ã™ã‚‹é–¢æ•°ã®å¼•æ•°ã¨ã—ã¦ã‚¢ ã‚¯ã‚»ã‚¹ã§ãã‚‹ã€‚ æ–°ã—ã„ã‚·ã‚¹ãƒ†ãƒ ã‚³ãƒ¼ãƒ«ã‚’è¿½åŠ ã™ã‚‹ã«ã¯ä»¥ä¸‹ã®ã‚ˆã†ã«ã™ã‚‹ã€‚ arch/i386/kernel/entry.Sã«æ–°ã—ã„ã‚¨ãƒ³ãƒˆãƒªã‚’è¿½åŠ ã™ã‚‹ã€‚ ENTRY(sys_call_table) .long SYMBOL_NAME(sys_ni_syscall) .long SYMBOL_NAME(sys_exit) : .long SYMBOL_NAME(sys_new_syscall) /* æ–°ã—ã„ã‚¨ãƒ³ãƒˆãƒª */ .rept NR_sysc
shomah4a 2011/01/25
linux

ãƒ•ãƒƒã‚¯

hack

ã‚·ã‚¹ãƒ†ãƒ ã‚³ãƒ¼ãƒ«

kernel

LKM
ãƒªãƒ³ã‚¯
1