CVE-2022-50091 (GCVE-0-2022-50091)
Vulnerability from cvelistv5
Published
2025-06-18 11:02
Modified
2025-06-18 11:02
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: locking/csd_lock: Change csdlock_debug from early_param to __setup The csdlock_debug kernel-boot parameter is parsed by the early_param() function csdlock_debug(). If set, csdlock_debug() invokes static_branch_enable() to enable csd_lock_wait feature, which triggers a panic on arm64 for kernels built with CONFIG_SPARSEMEM=y and CONFIG_SPARSEMEM_VMEMMAP=n. With CONFIG_SPARSEMEM_VMEMMAP=n, __nr_to_section is called in static_key_enable() and returns NULL, resulting in a NULL dereference because mem_section is initialized only later in sparse_init(). This is also a problem for powerpc because early_param() functions are invoked earlier than jump_label_init(), also resulting in static_key_enable() failures. These failures cause the warning "static key 'xxx' used before call to jump_label_init()". Thus, early_param is too early for csd_lock_wait to run static_branch_enable(), so changes it to __setup to fix these.
References
Impacted products
Vendor Product Version
Linux Linux Version: 8d0968cc6b8ffd8496c2ebffdfdc801f949a85e5
Version: 8d0968cc6b8ffd8496c2ebffdfdc801f949a85e5
Version: 8d0968cc6b8ffd8496c2ebffdfdc801f949a85e5
Version: 8d0968cc6b8ffd8496c2ebffdfdc801f949a85e5
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{
  "containers": {
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          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
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              "operator": "OR"
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nlocking/csd_lock: Change csdlock_debug from early_param to __setup\n\nThe csdlock_debug kernel-boot parameter is parsed by the\nearly_param() function csdlock_debug().  If set, csdlock_debug()\ninvokes static_branch_enable() to enable csd_lock_wait feature, which\ntriggers a panic on arm64 for kernels built with CONFIG_SPARSEMEM=y and\nCONFIG_SPARSEMEM_VMEMMAP=n.\n\nWith CONFIG_SPARSEMEM_VMEMMAP=n, __nr_to_section is called in\nstatic_key_enable() and returns NULL, resulting in a NULL dereference\nbecause mem_section is initialized only later in sparse_init().\n\nThis is also a problem for powerpc because early_param() functions\nare invoked earlier than jump_label_init(), also resulting in\nstatic_key_enable() failures.  These failures cause the warning \"static\nkey \u0027xxx\u0027 used before call to jump_label_init()\".\n\nThus, early_param is too early for csd_lock_wait to run\nstatic_branch_enable(), so changes it to __setup to fix these."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-06-18T11:02:30.729Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
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          "url": "https://git.kernel.org/stable/c/d2cbdbe22b5f190055d2d0ae92e7454479343a30"
        },
        {
          "url": "https://git.kernel.org/stable/c/05de9e2e33b1625c71aee69e353fe906dd2be88a"
        },
        {
          "url": "https://git.kernel.org/stable/c/b480d1e9a8c11ecc1c99dc01814b28e3103bd0a0"
        },
        {
          "url": "https://git.kernel.org/stable/c/9c9b26b0df270d4f9246e483a44686fca951a29c"
        }
      ],
      "title": "locking/csd_lock: Change csdlock_debug from early_param to __setup",
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  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2022-50091",
    "datePublished": "2025-06-18T11:02:30.729Z",
    "dateReserved": "2025-06-18T10:57:27.411Z",
    "dateUpdated": "2025-06-18T11:02:30.729Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2022-50091\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-06-18T11:15:38.277\",\"lastModified\":\"2025-06-18T13:47:40.833\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nlocking/csd_lock: Change csdlock_debug from early_param to __setup\\n\\nThe csdlock_debug kernel-boot parameter is parsed by the\\nearly_param() function csdlock_debug().  If set, csdlock_debug()\\ninvokes static_branch_enable() to enable csd_lock_wait feature, which\\ntriggers a panic on arm64 for kernels built with CONFIG_SPARSEMEM=y and\\nCONFIG_SPARSEMEM_VMEMMAP=n.\\n\\nWith CONFIG_SPARSEMEM_VMEMMAP=n, __nr_to_section is called in\\nstatic_key_enable() and returns NULL, resulting in a NULL dereference\\nbecause mem_section is initialized only later in sparse_init().\\n\\nThis is also a problem for powerpc because early_param() functions\\nare invoked earlier than jump_label_init(), also resulting in\\nstatic_key_enable() failures.  These failures cause the warning \\\"static\\nkey \u0027xxx\u0027 used before call to jump_label_init()\\\".\\n\\nThus, early_param is too early for csd_lock_wait to run\\nstatic_branch_enable(), so changes it to __setup to fix these.\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: locking/csd_lock: Cambiar csdlock_debug de early_param a __setup El par\u00e1metro csdlock_debug kernel-boot es analizado por la funci\u00f3n early_param() csdlock_debug(). Si se establece, csdlock_debug() invoca static_branch_enable() para habilitar la funci\u00f3n csd_lock_wait, que desencadena un p\u00e1nico en arm64 para kernels compilados con CONFIG_SPARSEMEM=y y CONFIG_SPARSEMEM_VMEMMAP=n. Con CONFIG_SPARSEMEM_VMEMMAP=n, se llama a __nr_to_section en static_key_enable() y devuelve NULL, lo que resulta en una desreferencia NULL porque mem_section se inicializa solo m\u00e1s tarde en sparse_init(). Esto tambi\u00e9n representa un problema para PowerPC, ya que las funciones early_param() se invocan antes que jump_label_init(), lo que tambi\u00e9n provoca fallos en static_key_enable(). Estos fallos generan la advertencia \\\"Clave est\u00e1tica \u0027xxx\u0027 usada antes de la llamada a jump_label_init()\\\". Por lo tanto, early_param es demasiado pronto para que csd_lock_wait ejecute static_branch_enable(), por lo que se cambia a __setup para solucionarlos.\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/05de9e2e33b1625c71aee69e353fe906dd2be88a\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/9c9b26b0df270d4f9246e483a44686fca951a29c\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/b480d1e9a8c11ecc1c99dc01814b28e3103bd0a0\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/d2cbdbe22b5f190055d2d0ae92e7454479343a30\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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