cve-2024-36943
Vulnerability from cvelistv5
Published
2024-05-30 15:35
Modified
2024-08-02 03:43
Severity
Summary
fs/proc/task_mmu: fix loss of young/dirty bits during pagemap scan
References
SourceURLTags
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/74b3d66f91d9f539f99faad74d796fa9a389a015
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/c70dce4982ce1718bf978a35f8e26160b82081f4
Impacted products
VendorProduct
LinuxLinux
LinuxLinux
Show details on NVD website

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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nfs/proc/task_mmu: fix loss of young/dirty bits during pagemap scan\n\nmake_uffd_wp_pte() was previously doing:\n\n  pte = ptep_get(ptep);\n  ptep_modify_prot_start(ptep);\n  pte = pte_mkuffd_wp(pte);\n  ptep_modify_prot_commit(ptep, pte);\n\nBut if another thread accessed or dirtied the pte between the first 2\ncalls, this could lead to loss of that information.  Since\nptep_modify_prot_start() gets and clears atomically, the following is the\ncorrect pattern and prevents any possible race.  Any access after the\nfirst call would see an invalid pte and cause a fault:\n\n  pte = ptep_modify_prot_start(ptep);\n  pte = pte_mkuffd_wp(pte);\n  ptep_modify_prot_commit(ptep, pte);"
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    "nvd": "{\"cve\":{\"id\":\"CVE-2024-36943\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2024-05-30T16:15:17.307\",\"lastModified\":\"2024-05-30T18:18:58.870\",\"vulnStatus\":\"Awaiting Analysis\",\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nfs/proc/task_mmu: fix loss of young/dirty bits during pagemap scan\\n\\nmake_uffd_wp_pte() was previously doing:\\n\\n  pte = ptep_get(ptep);\\n  ptep_modify_prot_start(ptep);\\n  pte = pte_mkuffd_wp(pte);\\n  ptep_modify_prot_commit(ptep, pte);\\n\\nBut if another thread accessed or dirtied the pte between the first 2\\ncalls, this could lead to loss of that information.  Since\\nptep_modify_prot_start() gets and clears atomically, the following is the\\ncorrect pattern and prevents any possible race.  Any access after the\\nfirst call would see an invalid pte and cause a fault:\\n\\n  pte = ptep_modify_prot_start(ptep);\\n  pte = pte_mkuffd_wp(pte);\\n  ptep_modify_prot_commit(ptep, pte);\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: fs/proc/task_mmu: corrige la p\u00e9rdida de bits j\u00f3venes/sucios durante el escaneo del mapa de p\u00e1ginas que make_uffd_wp_pte() estaba haciendo anteriormente: pte = ptep_get(ptep); ptep_modify_prot_start(ptep); pte = pte_mkuffd_wp(pte); ptep_modify_prot_commit(ptep,pte); Pero si otro hilo accedi\u00f3 o ensuci\u00f3 el pte entre las 2 primeras llamadas, esto podr\u00eda provocar la p\u00e9rdida de esa informaci\u00f3n. Dado que ptep_modify_prot_start() obtiene y borra at\u00f3micamente, el siguiente es el patr\u00f3n correcto y evita cualquier posible ejecuci\u00f3n. Cualquier acceso despu\u00e9s de la primera llamada ver\u00eda un pte no v\u00e1lido y provocar\u00eda una falla: pte = ptep_modify_prot_start(ptep); pte = pte_mkuffd_wp(pte); ptep_modify_prot_commit(ptep,pte);\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/74b3d66f91d9f539f99faad74d796fa9a389a015\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/c70dce4982ce1718bf978a35f8e26160b82081f4\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
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