cve-2024-39476
Vulnerability from cvelistv5
Published
2024-07-05 06:55
Modified
2024-08-02 04:26
Severity
Summary
md/raid5: fix deadlock that raid5d() wait for itself to clear MD_SB_CHANGE_PENDING
References
SourceURLTags
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
Impacted products
VendorProduct
LinuxLinux
LinuxLinux
Show details on NVD website

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    "dateUpdated": "2024-08-02T04:26:15.248Z",
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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. 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