cve-2022-48797
Vulnerability from cvelistv5
Published
2024-07-16 11:43
Modified
2024-11-04 12:16
Severity ?
Summary
mm: don't try to NUMA-migrate COW pages that have other uses
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/254090925e16abd914c87b4ad1b489440d89c4c3
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/80d47f5de5e311cbc0d01ebb6ee684e8f4c196c6
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/b3dc4b9d3ca68b370c4aeab5355007eedf948849
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/d187eeb02d18446e5e54ed6bcbf8b47e6551daea
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/254090925e16abd914c87b4ad1b489440d89c4c3
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/80d47f5de5e311cbc0d01ebb6ee684e8f4c196c6
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/b3dc4b9d3ca68b370c4aeab5355007eedf948849
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/d187eeb02d18446e5e54ed6bcbf8b47e6551daea
Impacted products
Vendor Product Version
Linux Linux Version: 5.9
Show details on NVD website

To clipboard 

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But it appears it\\ndoes.  Suspicious.\\n\\nHowever, regardless of that, the condition for enabling NUMA faults in\\nchange_pte_range() is nonsensical.  It uses \\\"page_mapcount(page)\\\" to\\ndecide if a COW page should be NUMA-protected or not, and that makes\\nabsolutely no sense.\\n\\nThe number of mappings a page has is irrelevant: not only does GUP get a\\nreference to a page as in Oded\u0027s case, but the other mappings migth be\\npaged out and the only reference to them would be in the page count.\\n\\nSince we should never try to NUMA-balance a page that we can\u0027t move\\nanyway due to other references, just fix the code to use \u0027page_count()\u0027.\\nOded confirms that that fixes his issue.\\n\\nNow, this does imply that something in NUMA balancing ends up changing\\npage protections (other than the obvious one of making the page\\ninaccessible to get the NUMA faulting information).  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El equilibrio de numa, el uso de la afinidad del proceso para vincularse a un nodo numa espec\u00edfico o revertir este parche hace que el error desaparezca\\\" y Oded dividi\u00f3 el problema en dos para el commit 09854ba94c6a (\\\"mm: simplificaci\u00f3n de do_wp_page()\\\"). Ahora bien, el equilibrio NUMA en realidad no deber\u00eda cambiar la capacidad de escritura de una p\u00e1gina y, como tal, no deber\u00eda importarle a COW. Pero parece que s\u00ed. Sospechoso. Sin embargo, independientemente de eso, la condici\u00f3n para habilitar fallas NUMA en change_pte_range() no tiene sentido. Utiliza \\\"page_mapcount(page)\\\" para decidir si una p\u00e1gina COW debe estar protegida por NUMA o no, y eso no tiene ning\u00fan sentido. El n\u00famero de asignaciones que tiene una p\u00e1gina es irrelevante: GUP no solo obtiene una referencia a una p\u00e1gina como en el caso de Oded, sino que las otras asignaciones podr\u00edan eliminarse y la \u00fanica referencia a ellas estar\u00eda en el recuento de p\u00e1ginas. Dado que nunca debemos intentar equilibrar NUMA una p\u00e1gina que no podemos mover de todos modos debido a otras referencias, simplemente corrija el c\u00f3digo para usar \u0027page_count()\u0027. Oded confirma que eso soluciona su problema. Ahora bien, esto implica que algo en el equilibrio de NUMA termina cambiando las protecciones de la p\u00e1gina (aparte de la obvia de hacer que la p\u00e1gina sea inaccesible para obtener la informaci\u00f3n de fallas de NUMA). De lo contrario, la simplificaci\u00f3n de COW no importar\u00eda, ya que hacer el GUP en la p\u00e1gina garantizar\u00eda que se pueda escribir. 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}


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