github - ghsa-5fx7-qfg5-mpmc

ghsa-5fx7-qfg5-mpmc

Vulnerability from github

Published

2024-02-27 21:31

Modified

2024-02-27 21:31

Details

In the Linux kernel, the following vulnerability has been resolved:

ovl: fix leaked dentry

Since commit 6815f479ca90 ("ovl: use only uppermetacopy state in ovl_lookup()"), overlayfs doesn't put temporary dentry when there is a metacopy error, which leads to dentry leaks when shutting down the related superblock:

overlayfs: refusing to follow metacopy origin for (/file0) ... BUG: Dentry (_ptrval_){i=3f33,n=file3} still in use (1) [unmount of overlay overlay] ... WARNING: CPU: 1 PID: 432 at umount_check.cold+0x107/0x14d CPU: 1 PID: 432 Comm: unmount-overlay Not tainted 5.12.0-rc5 #1 ... RIP: 0010:umount_check.cold+0x107/0x14d ... Call Trace: d_walk+0x28c/0x950 ? dentry_lru_isolate+0x2b0/0x2b0 ? __kasan_slab_free+0x12/0x20 do_one_tree+0x33/0x60 shrink_dcache_for_umount+0x78/0x1d0 generic_shutdown_super+0x70/0x440 kill_anon_super+0x3e/0x70 deactivate_locked_super+0xc4/0x160 deactivate_super+0xfa/0x140 cleanup_mnt+0x22e/0x370 __cleanup_mnt+0x1a/0x30 task_work_run+0x139/0x210 do_exit+0xb0c/0x2820 ? __kasan_check_read+0x1d/0x30 ? find_held_lock+0x35/0x160 ? lock_release+0x1b6/0x660 ? mm_update_next_owner+0xa20/0xa20 ? reacquire_held_locks+0x3f0/0x3f0 ? __sanitizer_cov_trace_const_cmp4+0x22/0x30 do_group_exit+0x135/0x380 __do_sys_exit_group.isra.0+0x20/0x20 __x64_sys_exit_group+0x3c/0x50 do_syscall_64+0x45/0x70 entry_SYSCALL_64_after_hwframe+0x44/0xae ... VFS: Busy inodes after unmount of overlay. Self-destruct in 5 seconds. Have a nice day...

This fix has been tested with a syzkaller reproducer.

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{
  "affected": [],
  "aliases": [
    "CVE-2021-46972"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2024-02-27T19:04:07Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\novl: fix leaked dentry\n\nSince commit 6815f479ca90 (\"ovl: use only uppermetacopy state in\novl_lookup()\"), overlayfs doesn\u0027t put temporary dentry when there is a\nmetacopy error, which leads to dentry leaks when shutting down the related\nsuperblock:\n\n  overlayfs: refusing to follow metacopy origin for (/file0)\n  ...\n  BUG: Dentry (____ptrval____){i=3f33,n=file3}  still in use (1) [unmount of overlay overlay]\n  ...\n  WARNING: CPU: 1 PID: 432 at umount_check.cold+0x107/0x14d\n  CPU: 1 PID: 432 Comm: unmount-overlay Not tainted 5.12.0-rc5 #1\n  ...\n  RIP: 0010:umount_check.cold+0x107/0x14d\n  ...\n  Call Trace:\n   d_walk+0x28c/0x950\n   ? dentry_lru_isolate+0x2b0/0x2b0\n   ? __kasan_slab_free+0x12/0x20\n   do_one_tree+0x33/0x60\n   shrink_dcache_for_umount+0x78/0x1d0\n   generic_shutdown_super+0x70/0x440\n   kill_anon_super+0x3e/0x70\n   deactivate_locked_super+0xc4/0x160\n   deactivate_super+0xfa/0x140\n   cleanup_mnt+0x22e/0x370\n   __cleanup_mnt+0x1a/0x30\n   task_work_run+0x139/0x210\n   do_exit+0xb0c/0x2820\n   ? __kasan_check_read+0x1d/0x30\n   ? find_held_lock+0x35/0x160\n   ? lock_release+0x1b6/0x660\n   ? mm_update_next_owner+0xa20/0xa20\n   ? reacquire_held_locks+0x3f0/0x3f0\n   ? __sanitizer_cov_trace_const_cmp4+0x22/0x30\n   do_group_exit+0x135/0x380\n   __do_sys_exit_group.isra.0+0x20/0x20\n   __x64_sys_exit_group+0x3c/0x50\n   do_syscall_64+0x45/0x70\n   entry_SYSCALL_64_after_hwframe+0x44/0xae\n  ...\n  VFS: Busy inodes after unmount of overlay. Self-destruct in 5 seconds.  Have a nice day...\n\nThis fix has been tested with a syzkaller reproducer.",
  "id": "GHSA-5fx7-qfg5-mpmc",
  "modified": "2024-02-27T21:31:27Z",
  "published": "2024-02-27T21:31:27Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2021-46972"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/71d58457a8afc650da5d3292a7f7029317654d95"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/cf3e3330bc5719fa9d658e3e2f596bde89344a94"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d587cfaef72b1b6f4b2774827123bce91f497cc8"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/eaab1d45cdb4bb0c846bd23c3d666d5b90af7b41"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

cve-2021-46972

Vulnerability from cvelistv5

Published

2024-02-27 18:47

Modified

2024-11-04 11:56

Severity ?

Summary

ovl: fix leaked dentry

References

▼	URL	Tags
	https://git.kernel.org/stable/c/71d58457a8afc650da5d3292a7f7029317654d95
	https://git.kernel.org/stable/c/cf3e3330bc5719fa9d658e3e2f596bde89344a94
	https://git.kernel.org/stable/c/d587cfaef72b1b6f4b2774827123bce91f497cc8
	https://git.kernel.org/stable/c/eaab1d45cdb4bb0c846bd23c3d666d5b90af7b41

Impacted products

Vendor

Product

Version

▼

Linux

Version: 6815f479ca90
Version: 6815f479ca90
Version: 6815f479ca90
Version: 6815f479ca90

Linux

Version: 5.8

Show details on NVD website

JSON

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Sightings

Author	Source	Type	Date

Nomenclature

Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
Confirmed: The vulnerability is confirmed from an analyst perspective.
Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
Patched: This vulnerability was successfully patched by the user reporting the sighting.
Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
Not confirmed: The user expresses doubt about the veracity of the vulnerability.
Not patched: This vulnerability was not successfully patched by the user reporting the sighting.

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