cve-2024-39476
Vulnerability from cvelistv5
Published
2024-07-05 06:55
Modified
2024-12-19 09:06
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: md/raid5: fix deadlock that raid5d() wait for itself to clear MD_SB_CHANGE_PENDING Xiao reported that lvm2 test lvconvert-raid-takeover.sh can hang with small possibility, the root cause is exactly the same as commit bed9e27baf52 ("Revert "md/raid5: Wait for MD_SB_CHANGE_PENDING in raid5d"") However, Dan reported another hang after that, and junxiao investigated the problem and found out that this is caused by plugged bio can't issue from raid5d(). Current implementation in raid5d() has a weird dependence: 1) md_check_recovery() from raid5d() must hold 'reconfig_mutex' to clear MD_SB_CHANGE_PENDING; 2) raid5d() handles IO in a deadloop, until all IO are issued; 3) IO from raid5d() must wait for MD_SB_CHANGE_PENDING to be cleared; This behaviour is introduce before v2.6, and for consequence, if other context hold 'reconfig_mutex', and md_check_recovery() can't update super_block, then raid5d() will waste one cpu 100% by the deadloop, until 'reconfig_mutex' is released. Refer to the implementation from raid1 and raid10, fix this problem by skipping issue IO if MD_SB_CHANGE_PENDING is still set after md_check_recovery(), daemon thread will be woken up when 'reconfig_mutex' is released. Meanwhile, the hang problem will be fixed as well.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/098d54934814dd876963abfe751c3b1cf7fbe56aMailing List, Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/151f66bb618d1fd0eeb84acb61b4a9fa5d8bb0faMailing List, Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/3f8d5e802d4cedd445f9a89be8c3fd2d0e99024bMailing List, Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/634ba3c97ec413cb10681c7b196db43ee461ecf4Mailing List, Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/aa64464c8f4d2ab92f6d0b959a1e0767b829d787Mailing List, Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/b32aa95843cac6b12c2c014d40fca18aef24a347Mailing List, Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/cd2538e5af495b3c747e503db346470fc1ffc447Mailing List, Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/e332a12f65d8fed8cf63bedb4e9317bb872b9ac7Mailing List, Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/098d54934814dd876963abfe751c3b1cf7fbe56aMailing List, Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/151f66bb618d1fd0eeb84acb61b4a9fa5d8bb0faMailing List, Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/3f8d5e802d4cedd445f9a89be8c3fd2d0e99024bMailing List, Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/634ba3c97ec413cb10681c7b196db43ee461ecf4Mailing List, Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/aa64464c8f4d2ab92f6d0b959a1e0767b829d787Mailing List, Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/b32aa95843cac6b12c2c014d40fca18aef24a347Mailing List, Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/cd2538e5af495b3c747e503db346470fc1ffc447Mailing List, Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/e332a12f65d8fed8cf63bedb4e9317bb872b9ac7Mailing List, Patch
Impacted products
Vendor Product Version
Linux Linux Version: 6.1
Show details on NVD website

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La implementaci\u00f3n actual en raid5d() tiene una dependencia extra\u00f1a: 1) md_check_recovery() de raid5d() debe mantener \u0027reconfig_mutex\u0027 para borrar MD_SB_CHANGE_PENDING; 2) raid5d() maneja IO en un bucle muerto, hasta que se emiten todas las IO; 3) IO de raid5d() debe esperar a que se borre MD_SB_CHANGE_PENDING; Este comportamiento se introdujo antes de v2.6 y, como consecuencia, si otro contexto contiene \u0027reconfig_mutex\u0027 y md_check_recovery() no puede actualizar super_block, entonces raid5d() desperdiciar\u00e1 una CPU al 100% mediante el bucle muerto, hasta que \u0027reconfig_mutex\u0027 sea liberado. Consulte la implementaci\u00f3n de raid1 y raid10, solucione este problema omitiendo el problema IO si MD_SB_CHANGE_PENDING todav\u00eda est\u00e1 configurado despu\u00e9s de md_check_recovery(), el hilo del daemon se activar\u00e1 cuando se publique \u0027reconfig_mutex\u0027. Mientras tanto, el problema de bloqueo tambi\u00e9n se 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  }
}


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  • Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
  • Confirmed: The vulnerability is confirmed from an analyst perspective.
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  • Patched: This vulnerability was successfully patched by the user reporting the sighting.
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  • Not confirmed: The user expresses doubt about the veracity of the vulnerability.
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