cve-2022-48931
Vulnerability from cvelistv5
Published
2024-08-22 03:31
Modified
2024-12-19 08:10
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: configfs: fix a race in configfs_{,un}register_subsystem() When configfs_register_subsystem() or configfs_unregister_subsystem() is executing link_group() or unlink_group(), it is possible that two processes add or delete list concurrently. Some unfortunate interleavings of them can cause kernel panic. One of cases is: A --> B --> C --> D A <-- B <-- C <-- D delete list_head *B | delete list_head *C --------------------------------|----------------------------------- configfs_unregister_subsystem | configfs_unregister_subsystem unlink_group | unlink_group unlink_obj | unlink_obj list_del_init | list_del_init __list_del_entry | __list_del_entry __list_del | __list_del // next == C | next->prev = prev | | next->prev = prev prev->next = next | | // prev == B | prev->next = next Fix this by adding mutex when calling link_group() or unlink_group(), but parent configfs_subsystem is NULL when config_item is root. So I create a mutex configfs_subsystem_mutex.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/3aadfd46858b1f64d4d6a0654b863e21aabff975Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/40805099af11f68c5ca7dbcfacf455da8f99f622Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/84ec758fb2daa236026506868c8796b0500c047dPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/a37024f7757c25550accdebf49e497ad6ae239fePatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/a7ab53d3c27dfe83bb594456b9f38a37796ec39bPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/b7e2b91fcb5c78c414e33dc8d50642e307ca0c5aPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/d1654de19d42f513b6cfe955cc77e7f427e05a77Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/e7a66dd2687758718eddd79b542a95cf3aa488ccPatch
Impacted products
Vendor Product Version
Linux Linux Version: 7063fbf2261194f72ee75afca67b3b38b554b5fa
Version: 7063fbf2261194f72ee75afca67b3b38b554b5fa
Version: 7063fbf2261194f72ee75afca67b3b38b554b5fa
Version: 7063fbf2261194f72ee75afca67b3b38b554b5fa
Version: 7063fbf2261194f72ee75afca67b3b38b554b5fa
Version: 7063fbf2261194f72ee75afca67b3b38b554b5fa
Version: 7063fbf2261194f72ee75afca67b3b38b554b5fa
Version: 7063fbf2261194f72ee75afca67b3b38b554b5fa
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   Linux Linux Version: 2.6.16
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\"unaffected\", \"version\": \"0\", \"lessThan\": \"2.6.16\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"4.9.304\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"4.9.*\"}, {\"status\": \"unaffected\", \"version\": \"4.14.269\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"4.14.*\"}, {\"status\": \"unaffected\", \"version\": \"4.19.232\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"4.19.*\"}, {\"status\": \"unaffected\", \"version\": \"5.4.182\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.4.*\"}, {\"status\": \"unaffected\", \"version\": \"5.10.103\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.10.*\"}, {\"status\": \"unaffected\", \"version\": \"5.15.26\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.15.*\"}, {\"status\": \"unaffected\", \"version\": \"5.16.12\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.16.*\"}, {\"status\": \"unaffected\", \"version\": \"5.17\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"fs/configfs/dir.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/40805099af11f68c5ca7dbcfacf455da8f99f622\"}, {\"url\": \"https://git.kernel.org/stable/c/d1654de19d42f513b6cfe955cc77e7f427e05a77\"}, {\"url\": \"https://git.kernel.org/stable/c/a37024f7757c25550accdebf49e497ad6ae239fe\"}, {\"url\": \"https://git.kernel.org/stable/c/b7e2b91fcb5c78c414e33dc8d50642e307ca0c5a\"}, {\"url\": \"https://git.kernel.org/stable/c/a7ab53d3c27dfe83bb594456b9f38a37796ec39b\"}, {\"url\": \"https://git.kernel.org/stable/c/e7a66dd2687758718eddd79b542a95cf3aa488cc\"}, {\"url\": \"https://git.kernel.org/stable/c/3aadfd46858b1f64d4d6a0654b863e21aabff975\"}, {\"url\": \"https://git.kernel.org/stable/c/84ec758fb2daa236026506868c8796b0500c047d\"}], \"x_generator\": {\"engine\": \"bippy-9e1c9544281a\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\nconfigfs: fix a race in configfs_{,un}register_subsystem()\\n\\nWhen configfs_register_subsystem() or configfs_unregister_subsystem()\\nis executing link_group() or unlink_group(),\\nit is possible that two processes add or delete list concurrently.\\nSome unfortunate interleavings of them can cause kernel panic.\\n\\nOne of cases is:\\nA --\u003e B --\u003e C --\u003e D\\nA \u003c-- B \u003c-- C \u003c-- D\\n\\n     delete list_head *B        |      delete list_head *C\\n--------------------------------|-----------------------------------\\nconfigfs_unregister_subsystem   |   configfs_unregister_subsystem\\n  unlink_group                  |     unlink_group\\n    unlink_obj                  |       unlink_obj\\n      list_del_init             |         list_del_init\\n        __list_del_entry        |           __list_del_entry\\n          __list_del            |             __list_del\\n            // next == C        |\\n            next-\u003eprev = prev   |\\n                                |               next-\u003eprev = prev\\n            prev-\u003enext = next   |\\n                                |                 // prev == B\\n                                |                 prev-\u003enext = next\\n\\nFix this by adding mutex when calling link_group() or unlink_group(),\\nbut parent configfs_subsystem is NULL when config_item is root.\\nSo I create a mutex configfs_subsystem_mutex.\"}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2024-11-04T12:19:24.787Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2022-48931\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2024-11-04T12:19:24.787Z\", \"dateReserved\": \"2024-08-21T06:06:23.299Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-08-22T03:31:24.823Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.1"
    }
  }
}


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