CVE-2024-26960
Vulnerability from cvelistv5
Published
2024-05-01 05:19
Modified
2024-11-05 09:18
Severity ?
5.5 (Medium) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Summary
mm: swap: fix race between free_swap_and_cache() and swapoff()
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/0f98f6d2fb5fad00f8299b84b85b6bc1b6d7d19a
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/1ede7f1d7eed1738d1b9333fd1e152ccb450b86a
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/2da5568ee222ce0541bfe446a07998f92ed1643e
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/363d17e7f7907c8e27a9e86968af0eaa2301787b
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/3ce4c4c653e4e478ecb15d3c88e690f12cbf6b39
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/82b1c07a0af603e3c47b906c8e991dc96f01688e
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/d85c11c97ecf92d47a4b29e3faca714dc1f18d0d
Impacted products
LinuxLinux
LinuxLinux
Show details on NVD website

To clipboard 

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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmm: swap: fix race between free_swap_and_cache() and swapoff()\n\nThere was previously a theoretical window where swapoff() could run and\nteardown a swap_info_struct while a call to free_swap_and_cache() was\nrunning in another thread.  This could cause, amongst other bad\npossibilities, swap_page_trans_huge_swapped() (called by\nfree_swap_and_cache()) to access the freed memory for swap_map.\n\nThis is a theoretical problem and I haven\u0027t been able to provoke it from a\ntest case.  But there has been agreement based on code review that this is\npossible (see link below).\n\nFix it by using get_swap_device()/put_swap_device(), which will stall\nswapoff().  There was an extra check in _swap_info_get() to confirm that\nthe swap entry was not free.  This isn\u0027t present in get_swap_device()\nbecause it doesn\u0027t make sense in general due to the race between getting\nthe reference and swapoff.  So I\u0027ve added an equivalent check directly in\nfree_swap_and_cache().\n\nDetails of how to provoke one possible issue (thanks to David Hildenbrand\nfor deriving this):\n\n--8\u003c-----\n\n__swap_entry_free() might be the last user and result in\n\"count == SWAP_HAS_CACHE\".\n\nswapoff-\u003etry_to_unuse() will stop as soon as soon as si-\u003einuse_pages==0.\n\nSo the question is: could someone reclaim the folio and turn\nsi-\u003einuse_pages==0, before we completed swap_page_trans_huge_swapped().\n\nImagine the following: 2 MiB folio in the swapcache. Only 2 subpages are\nstill references by swap entries.\n\nProcess 1 still references subpage 0 via swap entry.\nProcess 2 still references subpage 1 via swap entry.\n\nProcess 1 quits. Calls free_swap_and_cache().\n-\u003e count == SWAP_HAS_CACHE\n[then, preempted in the hypervisor etc.]\n\nProcess 2 quits. Calls free_swap_and_cache().\n-\u003e count == SWAP_HAS_CACHE\n\nProcess 2 goes ahead, passes swap_page_trans_huge_swapped(), and calls\n__try_to_reclaim_swap().\n\n__try_to_reclaim_swap()-\u003efolio_free_swap()-\u003edelete_from_swap_cache()-\u003e\nput_swap_folio()-\u003efree_swap_slot()-\u003eswapcache_free_entries()-\u003e\nswap_entry_free()-\u003eswap_range_free()-\u003e\n...\nWRITE_ONCE(si-\u003einuse_pages, si-\u003einuse_pages - nr_entries);\n\nWhat stops swapoff to succeed after process 2 reclaimed the swap cache\nbut before process1 finished its call to swap_page_trans_huge_swapped()?\n\n--8\u003c-----"
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But there has been agreement based on code review that this is\\npossible (see link below).\\n\\nFix it by using get_swap_device()/put_swap_device(), which will stall\\nswapoff().  There was an extra check in _swap_info_get() to confirm that\\nthe swap entry was not free.  This isn\u0027t present in get_swap_device()\\nbecause it doesn\u0027t make sense in general due to the race between getting\\nthe reference and swapoff.  So I\u0027ve added an equivalent check directly in\\nfree_swap_and_cache().\\n\\nDetails of how to provoke one possible issue (thanks to David Hildenbrand\\nfor deriving this):\\n\\n--8\u003c-----\\n\\n__swap_entry_free() might be the last user and result in\\n\\\"count == SWAP_HAS_CACHE\\\".\\n\\nswapoff-\u003etry_to_unuse() will stop as soon as soon as si-\u003einuse_pages==0.\\n\\nSo the question is: could someone reclaim the folio and turn\\nsi-\u003einuse_pages==0, before we completed swap_page_trans_huge_swapped().\\n\\nImagine the following: 2 MiB folio in the swapcache. Only 2 subpages are\\nstill references by swap entries.\\n\\nProcess 1 still references subpage 0 via swap entry.\\nProcess 2 still references subpage 1 via swap entry.\\n\\nProcess 1 quits. Calls free_swap_and_cache().\\n-\u003e count == SWAP_HAS_CACHE\\n[then, preempted in the hypervisor etc.]\\n\\nProcess 2 quits. Calls free_swap_and_cache().\\n-\u003e count == SWAP_HAS_CACHE\\n\\nProcess 2 goes ahead, passes swap_page_trans_huge_swapped(), and calls\\n__try_to_reclaim_swap().\\n\\n__try_to_reclaim_swap()-\u003efolio_free_swap()-\u003edelete_from_swap_cache()-\u003e\\nput_swap_folio()-\u003efree_swap_slot()-\u003eswapcache_free_entries()-\u003e\\nswap_entry_free()-\u003eswap_range_free()-\u003e\\n...\\nWRITE_ONCE(si-\u003einuse_pages, si-\u003einuse_pages - nr_entries);\\n\\nWhat stops swapoff to succeed after process 2 reclaimed the swap cache\\nbut before process1 finished its call to swap_page_trans_huge_swapped()?\\n\\n--8\u003c-----\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: mm: swap: corrige la ejecuci\u00f3n entre free_swap_and_cache() y swapoff() Anteriormente exist\u00eda una ventana te\u00f3rica donde swapoff() pod\u00eda ejecutar y desmantelar un swap_info_struct mientras se realizaba una llamada a free_swap_and_cache(). corriendo en otro hilo. Esto podr\u00eda causar, entre otras malas posibilidades, que swap_page_trans_huge_swapped() (llamado por free_swap_and_cache()) acceda a la memoria liberada para swap_map. Este es un problema te\u00f3rico y no he podido provocarlo a partir de un caso de prueba. Pero ha habido un acuerdo basado en la revisi\u00f3n del c\u00f3digo de que esto es posible (ver enlace a continuaci\u00f3n). Solucionarlo usando get_swap_device()/put_swap_device(), lo que detendr\u00e1 swapoff(). Hubo una verificaci\u00f3n adicional en _swap_info_get() para confirmar que la entrada de intercambio no era gratuita. Esto no est\u00e1 presente en get_swap_device() porque en general no tiene sentido debido a la ejecuci\u00f3n entre obtener la referencia y el intercambio. As\u00ed que agregu\u00e9 una verificaci\u00f3n equivalente directamente en free_swap_and_cache(). Detalles de c\u00f3mo provocar un posible problema (gracias a David Hildenbrand por derivar esto): --8\u0026lt;----- __swap_entry_free() podr\u00eda ser el \u00faltimo usuario y dar como resultado \\\"count == SWAP_HAS_CACHE\\\". swapoff-\u0026gt;try_to_unuse() se detendr\u00e1 tan pronto como si-\u0026gt;inuse_pages==0. Entonces la pregunta es: \u00bfalguien podr\u00eda reclamar la publicaci\u00f3n y activar si-\u0026gt;inuse_pages==0, antes de que completemos swap_page_trans_huge_swapped()? Imagine lo siguiente: folio de 2 MiB en el swapcache. S\u00f3lo 2 subp\u00e1ginas siguen siendo referencias mediante entradas de intercambio. El proceso 1 todav\u00eda hace referencia a la subp\u00e1gina 0 mediante la entrada de intercambio. El proceso 2 todav\u00eda hace referencia a la subp\u00e1gina 1 mediante la entrada de intercambio. El proceso 1 se cierra. Llama a free_swap_and_cache(). -\u0026gt; count == SWAP_HAS_CACHE [luego, adelantado en el hipervisor, etc.] El proceso 2 se cierra. Llama a free_swap_and_cache(). -\u0026gt; count == SWAP_HAS_CACHE El proceso 2 contin\u00faa, pasa swap_page_trans_huge_swapped() y llama a __try_to_reclaim_swap(). __try_to_reclaim_swap()-\u0026gt;folio_free_swap()-\u0026gt;delete_from_swap_cache()-\u0026gt; put_swap_folio()-\u0026gt;free_swap_slot()-\u0026gt;swapcache_free_entries()-\u0026gt; swap_entry_free()-\u0026gt;swap_range_free()-\u0026gt; ... WRITE_ONCE(si-\u0026gt;inuse_pages, si-\u0026gt;inuse_pages - nr_entries); \u00bfQu\u00e9 impide que el intercambio tenga \u00e9xito despu\u00e9s de que el proceso 2 recuper\u00f3 el cach\u00e9 de intercambio pero antes de que el proceso 1 terminara su llamada a swap_page_trans_huge_swapped()? --8\u0026lt;-----\"}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"134c704f-9b21-4f2e-91b3-4a467353bcc0\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\",\"baseScore\":5.5,\"baseSeverity\":\"MEDIUM\"},\"exploitabilityScore\":1.8,\"impactScore\":3.6}]},\"weaknesses\":[{\"source\":\"134c704f-9b21-4f2e-91b3-4a467353bcc0\",\"type\":\"Secondary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-362\"}]}],\"references\":[{\"url\":\"https://git.kernel.org/stable/c/0f98f6d2fb5fad00f8299b84b85b6bc1b6d7d19a\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/1ede7f1d7eed1738d1b9333fd1e152ccb450b86a\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/2da5568ee222ce0541bfe446a07998f92ed1643e\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/363d17e7f7907c8e27a9e86968af0eaa2301787b\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/3ce4c4c653e4e478ecb15d3c88e690f12cbf6b39\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/82b1c07a0af603e3c47b906c8e991dc96f01688e\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/d85c11c97ecf92d47a4b29e3faca714dc1f18d0d\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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