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
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/71d58457a8afc650da5d3292a7f7029317654d95
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/cf3e3330bc5719fa9d658e3e2f596bde89344a94
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/d587cfaef72b1b6f4b2774827123bce91f497cc8
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/eaab1d45cdb4bb0c846bd23c3d666d5b90af7b41
Impacted products
LinuxLinux
LinuxLinux
Show details on NVD website

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                "timestamp": "2024-06-28T17:00:35.229463Z",
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    "cna": {
      "affected": [
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          "value": "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."
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    "cveId": "CVE-2021-46972",
    "datePublished": "2024-02-27T18:47:07.276Z",
    "dateReserved": "2024-02-27T18:42:55.943Z",
    "dateUpdated": "2024-11-04T11:56:55.701Z",
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    "nvd": "{\"cve\":{\"id\":\"CVE-2021-46972\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2024-02-27T19:04:07.403\",\"lastModified\":\"2024-02-28T14:06:45.783\",\"vulnStatus\":\"Awaiting Analysis\",\"descriptions\":[{\"lang\":\"en\",\"value\":\"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.\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: ovl: corrige la dentry filtrada Desde el commit 6815f479ca90 (\\\"ovl: usa solo el estado de metacopia superior en ovl_lookup()\\\"), overlayfs no coloca la dentry temporal cuando hay un error de metacopia, lo que conduce a fugas de dentry al cerrar el superbloque relacionado: overlayfs: se niega a seguir el origen de la metacopia para (/file0)... ERROR: Dentry (____ptrval____){i=3f33,n=file3} todav\u00eda est\u00e1 en uso (1) [desmontaje de superposici\u00f3n superpuesta]... ADVERTENCIA: CPU: 1 PID: 432 en umount_check.cold+0x107/0x14d CPU: 1 PID: 432 Comm: unmount-overlay No contaminado 5.12.0-rc5 #1... RIP: 0010:umount_check .cold+0x107/0x14d... Seguimiento de llamadas: d_walk+0x28c/0x950 ? dentry_lru_isolate+0x2b0/0x2b0? __kasan_slab_free+0x12/0x20 do_one_tree+0x33/0x60 encogimiento_dcache_for_umount+0x78/0x1d0 generic_shutdown_super+0x70/0x440 kill_anon_super+0x3e/0x70 deactivate_locked_super+0xc4/0x160 deactivate_super+0xfa/0x140 clean up_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? \u00bfreaquirir_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 entrada_SYSCALL_64 _after_hwframe+0x44/0xae... VFS: Inodos ocupados despu\u00e9s de desmontar la superposici\u00f3n. Autodestrucci\u00f3n en 5 segundos. Que tengas un buen d\u00eda... Esta soluci\u00f3n ha sido probada con un reproductor syzkaller.\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/71d58457a8afc650da5d3292a7f7029317654d95\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/cf3e3330bc5719fa9d658e3e2f596bde89344a94\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/d587cfaef72b1b6f4b2774827123bce91f497cc8\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/eaab1d45cdb4bb0c846bd23c3d666d5b90af7b41\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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