CVE-2022-50091 (GCVE-0-2022-50091)

Vulnerability from cvelistv5 – Published: 2025-06-18 11:02 – Updated: 2025-06-18 11:02
VLAI?
Title
locking/csd_lock: Change csdlock_debug from early_param to __setup
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.
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 8d0968cc6b8ffd8496c2ebffdfdc801f949a85e5 , < d2cbdbe22b5f190055d2d0ae92e7454479343a30 (git)
Affected: 8d0968cc6b8ffd8496c2ebffdfdc801f949a85e5 , < 05de9e2e33b1625c71aee69e353fe906dd2be88a (git)
Affected: 8d0968cc6b8ffd8496c2ebffdfdc801f949a85e5 , < b480d1e9a8c11ecc1c99dc01814b28e3103bd0a0 (git)
Affected: 8d0968cc6b8ffd8496c2ebffdfdc801f949a85e5 , < 9c9b26b0df270d4f9246e483a44686fca951a29c (git)
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    Linux Linux Affected: 5.13
Unaffected: 0 , < 5.13 (semver)
Unaffected: 5.15.61 , ≤ 5.15.* (semver)
Unaffected: 5.18.18 , ≤ 5.18.* (semver)
Unaffected: 5.19.2 , ≤ 5.19.* (semver)
Unaffected: 6.0 , ≤ * (original_commit_for_fix)
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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."
        }
      ],
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        "dateUpdated": "2025-06-18T11:02:30.729Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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    "datePublished": "2025-06-18T11:02:30.729Z",
    "dateReserved": "2025-06-18T10:57:27.411Z",
    "dateUpdated": "2025-06-18T11:02:30.729Z",
    "state": "PUBLISHED"
  },
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}


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