cve-2024-38610
Vulnerability from cvelistv5
Published
2024-06-19 13:56
Modified
2024-12-19 09:05
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: drivers/virt/acrn: fix PFNMAP PTE checks in acrn_vm_ram_map() Patch series "mm: follow_pte() improvements and acrn follow_pte() fixes". Patch #1 fixes a bunch of issues I spotted in the acrn driver. It compiles, that's all I know. I'll appreciate some review and testing from acrn folks. Patch #2+#3 improve follow_pte(), passing a VMA instead of the MM, adding more sanity checks, and improving the documentation. Gave it a quick test on x86-64 using VM_PAT that ends up using follow_pte(). This patch (of 3): We currently miss handling various cases, resulting in a dangerous follow_pte() (previously follow_pfn()) usage. (1) We're not checking PTE write permissions. Maybe we should simply always require pte_write() like we do for pin_user_pages_fast(FOLL_WRITE)? Hard to tell, so let's check for ACRN_MEM_ACCESS_WRITE for now. (2) We're not rejecting refcounted pages. As we are not using MMU notifiers, messing with refcounted pages is dangerous and can result in use-after-free. Let's make sure to reject them. (3) We are only looking at the first PTE of a bigger range. We only lookup a single PTE, but memmap->len may span a larger area. Let's loop over all involved PTEs and make sure the PFN range is actually contiguous. Reject everything else: it couldn't have worked either way, and rather made use access PFNs we shouldn't be accessing.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/2c8d6e24930b8ef7d4a81787627c559ae0e0d3bb
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/3d6586008f7b638f91f3332602592caa8b00b559
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/4c4ba3cf3a15ccfbaf787d0296fa42cdb00da9b4
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/5c6705aa47b5b78d7ad36fea832bb69caa5bf49a
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/afeb0e69627695f759fc73c39c1640dbf8649b32
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/e873f36ec890bece26ecce850e969917bceebbb6
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/2c8d6e24930b8ef7d4a81787627c559ae0e0d3bb
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/3d6586008f7b638f91f3332602592caa8b00b559
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/4c4ba3cf3a15ccfbaf787d0296fa42cdb00da9b4
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/5c6705aa47b5b78d7ad36fea832bb69caa5bf49a
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/afeb0e69627695f759fc73c39c1640dbf8649b32
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/e873f36ec890bece26ecce850e969917bceebbb6
Impacted products
Vendor Product Version
Linux Linux Version: b9c43aa0b18da5619aac347d54cb67fe30d1f884
Version: 8a6e85f75a83d16a71077e41f2720c691f432002
Version: 8a6e85f75a83d16a71077e41f2720c691f432002
Version: 8a6e85f75a83d16a71077e41f2720c691f432002
Version: 8a6e85f75a83d16a71077e41f2720c691f432002
Version: 8a6e85f75a83d16a71077e41f2720c691f432002
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   Linux Linux Version: 5.18
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Reject everything else: it couldn't have worked\\neither way, and rather made use access PFNs we shouldn't be accessing.\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: drivers/virt/acrn: corrige las comprobaciones de PFNMAP PTE en acrn_vm_ram_map() Serie de parches \\\"mm: mejoras en follow_pte() y correcciones en acrn follow_pte()\\\". El parche n.º 1 soluciona varios problemas que detecté en el controlador acrn. Se compila, eso es todo lo que sé. Apreciaré algunas revisiones y pruebas por parte de la gente de acrn. El parche #2+#3 mejora follow_pte(), pasa un VMA en lugar del MM, agrega más controles de cordura y mejora la documentación. Lo probé rápidamente en x86-64 usando VM_PAT y terminó usando follow_pte(). Este parche (de 3): Actualmente no manejamos varios casos, lo que resulta en un uso peligroso de follow_pte() (anteriormente follow_pfn()). (1) No estamos verificando los permisos de escritura de PTE. ¿Quizás simplemente deberíamos requerir siempre pte_write() como lo hacemos para pin_user_pages_fast(FOLL_WRITE)? Es difícil saberlo, así que busquemos ACRN_MEM_ACCESS_WRITE por ahora. (2) No rechazamos páginas recontadas. Como no utilizamos notificadores MMU, jugar con páginas descontadas es peligroso y puede resultar en use-after-free. Asegurémonos de rechazarlos. (3) Sólo estamos ante el primer PTE de una gama mayor. Solo buscamos una PTE, pero memmap->len puede abarcar un área más grande. Recorramos todos los PTE involucrados y asegurémonos de que el rango de PFN sea realmente contiguo. Rechace todo lo demás: no podría haber funcionado de ninguna manera, y más bien utilizó PFN de acceso a los que no deberíamos acceder.\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/2c8d6e24930b8ef7d4a81787627c559ae0e0d3bb\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/3d6586008f7b638f91f3332602592caa8b00b559\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/4c4ba3cf3a15ccfbaf787d0296fa42cdb00da9b4\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/5c6705aa47b5b78d7ad36fea832bb69caa5bf49a\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/afeb0e69627695f759fc73c39c1640dbf8649b32\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/e873f36ec890bece26ecce850e969917bceebbb6\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/2c8d6e24930b8ef7d4a81787627c559ae0e0d3bb\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"},{\"url\":\"https://git.kernel.org/stable/c/3d6586008f7b638f91f3332602592caa8b00b559\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"},{\"url\":\"https://git.kernel.org/stable/c/4c4ba3cf3a15ccfbaf787d0296fa42cdb00da9b4\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"},{\"url\":\"https://git.kernel.org/stable/c/5c6705aa47b5b78d7ad36fea832bb69caa5bf49a\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"},{\"url\":\"https://git.kernel.org/stable/c/afeb0e69627695f759fc73c39c1640dbf8649b32\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"},{\"url\":\"https://git.kernel.org/stable/c/e873f36ec890bece26ecce850e969917bceebbb6\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"}]}}",
      vulnrichment: {
         containers: "{\"adp\": [{\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2024-38610\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2024-06-24T18:14:59.732296Z\"}}}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2024-06-24T18:15:04.471Z\"}}], \"cna\": {\"title\": \"drivers/virt/acrn: fix PFNMAP PTE checks in acrn_vm_ram_map()\", \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"b9c43aa0b18d\", \"lessThan\": \"5c6705aa47b5\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"8a6e85f75a83\", \"lessThan\": \"afeb0e696276\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"8a6e85f75a83\", \"lessThan\": \"e873f36ec890\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"8a6e85f75a83\", \"lessThan\": \"4c4ba3cf3a15\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"8a6e85f75a83\", \"lessThan\": \"2c8d6e24930b\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"8a6e85f75a83\", \"lessThan\": \"3d6586008f7b\", \"versionType\": \"git\"}], \"programFiles\": [\"drivers/virt/acrn/mm.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"5.18\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"5.18\", \"versionType\": \"custom\"}, {\"status\": \"unaffected\", \"version\": \"5.15.161\", \"versionType\": \"custom\", \"lessThanOrEqual\": \"5.15.*\"}, {\"status\": \"unaffected\", \"version\": \"6.1.93\", \"versionType\": \"custom\", \"lessThanOrEqual\": \"6.1.*\"}, {\"status\": \"unaffected\", \"version\": \"6.6.33\", \"versionType\": \"custom\", \"lessThanOrEqual\": \"6.6.*\"}, {\"status\": \"unaffected\", \"version\": \"6.8.12\", \"versionType\": \"custom\", \"lessThanOrEqual\": \"6.8.*\"}, {\"status\": \"unaffected\", \"version\": \"6.9.3\", \"versionType\": \"custom\", \"lessThanOrEqual\": \"6.9.*\"}, {\"status\": \"unaffected\", \"version\": \"6.10\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"drivers/virt/acrn/mm.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/5c6705aa47b5b78d7ad36fea832bb69caa5bf49a\"}, {\"url\": \"https://git.kernel.org/stable/c/afeb0e69627695f759fc73c39c1640dbf8649b32\"}, {\"url\": \"https://git.kernel.org/stable/c/e873f36ec890bece26ecce850e969917bceebbb6\"}, {\"url\": \"https://git.kernel.org/stable/c/4c4ba3cf3a15ccfbaf787d0296fa42cdb00da9b4\"}, {\"url\": \"https://git.kernel.org/stable/c/2c8d6e24930b8ef7d4a81787627c559ae0e0d3bb\"}, {\"url\": \"https://git.kernel.org/stable/c/3d6586008f7b638f91f3332602592caa8b00b559\"}], \"x_generator\": {\"engine\": \"bippy-c9c4e1df01b2\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\ndrivers/virt/acrn: fix PFNMAP PTE checks in acrn_vm_ram_map()\\n\\nPatch series \\\"mm: follow_pte() improvements and acrn follow_pte() fixes\\\".\\n\\nPatch #1 fixes a bunch of issues I spotted in the acrn driver.  It\\ncompiles, that's all I know.  I'll appreciate some review and testing from\\nacrn folks.\\n\\nPatch #2+#3 improve follow_pte(), passing a VMA instead of the MM, adding\\nmore sanity checks, and improving the documentation.  Gave it a quick test\\non x86-64 using VM_PAT that ends up using follow_pte().\\n\\n\\nThis patch (of 3):\\n\\nWe currently miss handling various cases, resulting in a dangerous\\nfollow_pte() (previously follow_pfn()) usage.\\n\\n(1) We're not checking PTE write permissions.\\n\\nMaybe we should simply always require pte_write() like we do for\\npin_user_pages_fast(FOLL_WRITE)? Hard to tell, so let's check for\\nACRN_MEM_ACCESS_WRITE for now.\\n\\n(2) We're not rejecting refcounted pages.\\n\\nAs we are not using MMU notifiers, messing with refcounted pages is\\ndangerous and can result in use-after-free. Let's make sure to reject them.\\n\\n(3) We are only looking at the first PTE of a bigger range.\\n\\nWe only lookup a single PTE, but memmap->len may span a larger area.\\nLet's loop over all involved PTEs and make sure the PFN range is\\nactually contiguous. Reject everything else: it couldn't have worked\\neither way, and rather made use access PFNs we shouldn't be accessing.\"}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2024-07-15T06:49:01.613Z\"}}}",
         cveMetadata: "{\"cveId\": \"CVE-2024-38610\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2024-07-15T06:49:01.613Z\", \"dateReserved\": \"2024-06-18T19:36:34.942Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-06-19T13:56:12.083Z\", \"assignerShortName\": \"Linux\"}",
         dataType: "CVE_RECORD",
         dataVersion: "5.1",
      },
   },
}


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