FKIE_CVE-2023-52707

Vulnerability from fkie_nvd - Published: 2024-05-21 16:15 - Updated: 2025-01-06 20:39
Severity
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: sched/psi: Fix use-after-free in ep_remove_wait_queue() If a non-root cgroup gets removed when there is a thread that registered trigger and is polling on a pressure file within the cgroup, the polling waitqueue gets freed in the following path: do_rmdir cgroup_rmdir kernfs_drain_open_files cgroup_file_release cgroup_pressure_release psi_trigger_destroy However, the polling thread still has a reference to the pressure file and will access the freed waitqueue when the file is closed or upon exit: fput ep_eventpoll_release ep_free ep_remove_wait_queue remove_wait_queue This results in use-after-free as pasted below. The fundamental problem here is that cgroup_file_release() (and consequently waitqueue's lifetime) is not tied to the file's real lifetime. Using wake_up_pollfree() here might be less than ideal, but it is in line with the comment at commit 42288cb44c4b ("wait: add wake_up_pollfree()") since the waitqueue's lifetime is not tied to file's one and can be considered as another special case. While this would be fixable by somehow making cgroup_file_release() be tied to the fput(), it would require sizable refactoring at cgroups or higher layer which might be more justifiable if we identify more cases like this. BUG: KASAN: use-after-free in _raw_spin_lock_irqsave+0x60/0xc0 Write of size 4 at addr ffff88810e625328 by task a.out/4404 CPU: 19 PID: 4404 Comm: a.out Not tainted 6.2.0-rc6 #38 Hardware name: Amazon EC2 c5a.8xlarge/, BIOS 1.0 10/16/2017 Call Trace: <TASK> dump_stack_lvl+0x73/0xa0 print_report+0x16c/0x4e0 kasan_report+0xc3/0xf0 kasan_check_range+0x2d2/0x310 _raw_spin_lock_irqsave+0x60/0xc0 remove_wait_queue+0x1a/0xa0 ep_free+0x12c/0x170 ep_eventpoll_release+0x26/0x30 __fput+0x202/0x400 task_work_run+0x11d/0x170 do_exit+0x495/0x1130 do_group_exit+0x100/0x100 get_signal+0xd67/0xde0 arch_do_signal_or_restart+0x2a/0x2b0 exit_to_user_mode_prepare+0x94/0x100 syscall_exit_to_user_mode+0x20/0x40 do_syscall_64+0x52/0x90 entry_SYSCALL_64_after_hwframe+0x63/0xcd </TASK> Allocated by task 4404: kasan_set_track+0x3d/0x60 __kasan_kmalloc+0x85/0x90 psi_trigger_create+0x113/0x3e0 pressure_write+0x146/0x2e0 cgroup_file_write+0x11c/0x250 kernfs_fop_write_iter+0x186/0x220 vfs_write+0x3d8/0x5c0 ksys_write+0x90/0x110 do_syscall_64+0x43/0x90 entry_SYSCALL_64_after_hwframe+0x63/0xcd Freed by task 4407: kasan_set_track+0x3d/0x60 kasan_save_free_info+0x27/0x40 ____kasan_slab_free+0x11d/0x170 slab_free_freelist_hook+0x87/0x150 __kmem_cache_free+0xcb/0x180 psi_trigger_destroy+0x2e8/0x310 cgroup_file_release+0x4f/0xb0 kernfs_drain_open_files+0x165/0x1f0 kernfs_drain+0x162/0x1a0 __kernfs_remove+0x1fb/0x310 kernfs_remove_by_name_ns+0x95/0xe0 cgroup_addrm_files+0x67f/0x700 cgroup_destroy_locked+0x283/0x3c0 cgroup_rmdir+0x29/0x100 kernfs_iop_rmdir+0xd1/0x140 vfs_rmdir+0xfe/0x240 do_rmdir+0x13d/0x280 __x64_sys_rmdir+0x2c/0x30 do_syscall_64+0x43/0x90 entry_SYSCALL_64_after_hwframe+0x63/0xcd
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/7caeb5457bd01ccba0df1d6f4872f20d28e50b38Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/c2dbe32d5db5c4ead121cf86dabd5ab691fb47fePatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/c6879a4dcefe92d870ab68cabaa9caeda4f2af5aPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/cca2b3feb70170ef6f0fbc4b4d91eea235a2b73aPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/ec9c7aa08819f976b2492fa63c41b5712d2924b5Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/7caeb5457bd01ccba0df1d6f4872f20d28e50b38Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/c2dbe32d5db5c4ead121cf86dabd5ab691fb47fePatch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/c6879a4dcefe92d870ab68cabaa9caeda4f2af5aPatch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/cca2b3feb70170ef6f0fbc4b4d91eea235a2b73aPatch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/ec9c7aa08819f976b2492fa63c41b5712d2924b5Patch
Impacted products
Vendor Product Version
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel 6.2
linux linux_kernel 6.2
linux linux_kernel 6.2
linux linux_kernel 6.2
linux linux_kernel 6.2
linux linux_kernel 6.2
linux linux_kernel 6.2
linux linux_kernel 6.2
To clipboard 

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  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nsched/psi: Fix use-after-free in ep_remove_wait_queue()\n\nIf a non-root cgroup gets removed when there is a thread that registered\ntrigger and is polling on a pressure file within the cgroup, the polling\nwaitqueue gets freed in the following path:\n\n do_rmdir\n   cgroup_rmdir\n     kernfs_drain_open_files\n       cgroup_file_release\n         cgroup_pressure_release\n           psi_trigger_destroy\n\nHowever, the polling thread still has a reference to the pressure file and\nwill access the freed waitqueue when the file is closed or upon exit:\n\n fput\n   ep_eventpoll_release\n     ep_free\n       ep_remove_wait_queue\n         remove_wait_queue\n\nThis results in use-after-free as pasted below.\n\nThe fundamental problem here is that cgroup_file_release() (and\nconsequently waitqueue\u0027s lifetime) is not tied to the file\u0027s real lifetime.\nUsing wake_up_pollfree() here might be less than ideal, but it is in line\nwith the comment at commit 42288cb44c4b (\"wait: add wake_up_pollfree()\")\nsince the waitqueue\u0027s lifetime is not tied to file\u0027s one and can be\nconsidered as another special case. While this would be fixable by somehow\nmaking cgroup_file_release() be tied to the fput(), it would require\nsizable refactoring at cgroups or higher layer which might be more\njustifiable if we identify more cases like this.\n\n  BUG: KASAN: use-after-free in _raw_spin_lock_irqsave+0x60/0xc0\n  Write of size 4 at addr ffff88810e625328 by task a.out/4404\n\n\tCPU: 19 PID: 4404 Comm: a.out Not tainted 6.2.0-rc6 #38\n\tHardware name: Amazon EC2 c5a.8xlarge/, BIOS 1.0 10/16/2017\n\tCall Trace:\n\t\u003cTASK\u003e\n\tdump_stack_lvl+0x73/0xa0\n\tprint_report+0x16c/0x4e0\n\tkasan_report+0xc3/0xf0\n\tkasan_check_range+0x2d2/0x310\n\t_raw_spin_lock_irqsave+0x60/0xc0\n\tremove_wait_queue+0x1a/0xa0\n\tep_free+0x12c/0x170\n\tep_eventpoll_release+0x26/0x30\n\t__fput+0x202/0x400\n\ttask_work_run+0x11d/0x170\n\tdo_exit+0x495/0x1130\n\tdo_group_exit+0x100/0x100\n\tget_signal+0xd67/0xde0\n\tarch_do_signal_or_restart+0x2a/0x2b0\n\texit_to_user_mode_prepare+0x94/0x100\n\tsyscall_exit_to_user_mode+0x20/0x40\n\tdo_syscall_64+0x52/0x90\n\tentry_SYSCALL_64_after_hwframe+0x63/0xcd\n\t\u003c/TASK\u003e\n\n Allocated by task 4404:\n\n\tkasan_set_track+0x3d/0x60\n\t__kasan_kmalloc+0x85/0x90\n\tpsi_trigger_create+0x113/0x3e0\n\tpressure_write+0x146/0x2e0\n\tcgroup_file_write+0x11c/0x250\n\tkernfs_fop_write_iter+0x186/0x220\n\tvfs_write+0x3d8/0x5c0\n\tksys_write+0x90/0x110\n\tdo_syscall_64+0x43/0x90\n\tentry_SYSCALL_64_after_hwframe+0x63/0xcd\n\n Freed by task 4407:\n\n\tkasan_set_track+0x3d/0x60\n\tkasan_save_free_info+0x27/0x40\n\t____kasan_slab_free+0x11d/0x170\n\tslab_free_freelist_hook+0x87/0x150\n\t__kmem_cache_free+0xcb/0x180\n\tpsi_trigger_destroy+0x2e8/0x310\n\tcgroup_file_release+0x4f/0xb0\n\tkernfs_drain_open_files+0x165/0x1f0\n\tkernfs_drain+0x162/0x1a0\n\t__kernfs_remove+0x1fb/0x310\n\tkernfs_remove_by_name_ns+0x95/0xe0\n\tcgroup_addrm_files+0x67f/0x700\n\tcgroup_destroy_locked+0x283/0x3c0\n\tcgroup_rmdir+0x29/0x100\n\tkernfs_iop_rmdir+0xd1/0x140\n\tvfs_rmdir+0xfe/0x240\n\tdo_rmdir+0x13d/0x280\n\t__x64_sys_rmdir+0x2c/0x30\n\tdo_syscall_64+0x43/0x90\n\tentry_SYSCALL_64_after_hwframe+0x63/0xcd"
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se resolvi\u00f3 la siguiente vulnerabilidad: sched/psi: corrige el use after free en ep_remove_wait_queue() si se elimina un cgroup no ra\u00edz cuando hay un subproceso que registr\u00f3 un activador y est\u00e1 sondeando un archivo de presi\u00f3n dentro en cgroup, la cola de espera de sondeo se libera en la siguiente ruta: do_rmdir cgroup_rmdir kernfs_drain_open_files cgroup_file_release cgroup_pression_release psi_trigger_destroy Sin embargo, el hilo de sondeo a\u00fan tiene una referencia al archivo de presi\u00f3n y acceder\u00e1 a la cola de espera liberada cuando el archivo se cierre o al salir: fput ep_eventpoll_release ep_free ep_remove_wait_queue remove_wait_queue Esto da como resultado un use after free como se pega a continuaci\u00f3n. El problema fundamental aqu\u00ed es que cgroup_file_release() (y en consecuencia la vida \u00fatil de la cola de espera) no est\u00e1 ligada a la vida real del archivo. Usar wake_up_pollfree() aqu\u00ed puede no ser ideal, pero est\u00e1 en l\u00ednea con el comentario en la confirmaci\u00f3n 42288cb44c4b (\"espera: agregar wake_up_pollfree()\") ya que la vida \u00fatil de la cola de espera no est\u00e1 ligada a la del archivo y puede considerarse como otro caso especial. . Si bien esto se podr\u00eda solucionar haciendo que cgroup_file_release() est\u00e9 vinculado de alguna manera a fput(), requerir\u00eda una refactorizaci\u00f3n considerable en cgroups o en una capa superior, lo que podr\u00eda ser m\u00e1s justificable si identificamos m\u00e1s casos como este. ERROR: KASAN: use-after-free en _raw_spin_lock_irqsave+0x60/0xc0 Escritura de tama\u00f1o 4 en la direcci\u00f3n ffff88810e625328 por tarea a.out/4404 CPU: 19 PID: 4404 Comm: a.out No contaminado 6.2.0-rc6 #38 Hardware nombre: Amazon EC2 c5a.8xlarge/, BIOS 1.0 16/10/2017 Seguimiento de llamadas:  dump_stack_lvl+0x73/0xa0 print_report+0x16c/0x4e0 kasan_report+0xc3/0xf0 kasan_check_range+0x2d2/0x310 _raw_spin_lock_irqsave+0x60/0x c0 remove_wait_queue+0x1a /0xa0 ep_free+0x12c/0x170 ep_eventpoll_release+0x26/0x30 __fput+0x202/0x400 task_work_run+0x11d/0x170 do_exit+0x495/0x1130 do_group_exit+0x100/0x100 get_signal+0xd67/0xde0 arch _do_signal_or_restart+0x2a/0x2b0 exit_to_user_mode_prepare+0x94/0x100 syscall_exit_to_user_mode+0x20 /0x40 do_syscall_64+0x52/0x90 Entry_SYSCALL_64_after_hwframe+0x63/0xcd  Asignado por tarea 4404: kasan_set_track+0x3d/0x60 __kasan_kmalloc+0x85/0x90 psi_trigger_create+0x113/0x3e0 Pressure_write+0x1 46/0x2e0 cgroup_file_write+0x11c/0x250 kernfs_fop_write_iter+0x186/ 0x220 vfs_write+0x3d8/0x5c0 ksys_write+0x90/0x110 do_syscall_64+0x43/0x90 Entry_SYSCALL_64_after_hwframe+0x63/0xcd Liberado por la tarea 4407: kasan_set_track+0x3d/0x60 kasan_save_free_info+0x27/ 0x40 ____kasan_slab_free+0x11d/0x170 slab_free_freelist_hook+0x87/0x150 __kmem_cache_free+0xcb/ 0x180 psi_trigger_destroy+0x2e8/0x310 cgroup_file_release+0x4f/0xb0 kernfs_drain_open_files+0x165/0x1f0 kernfs_drain+0x162/0x1a0 __kernfs_remove+0x1fb/0x310 ns+0x95/0xe0 cgroup_addrm_files+0x67f/0x700 cgroup_destroy_locked+0x283/0x3c0 cgroup_rmdir+0x29/0x100 kernfs_iop_rmdir+0xd1/ 0x140 vfs_rmdir+0xfe/0x240 do_rmdir+0x13d/0x280 __x64_sys_rmdir+0x2c/0x30 do_syscall_64+0x43/0x90 Entry_SYSCALL_64_after_hwframe+0x63/0xcd"
    }
  ],
  "id": "CVE-2023-52707",
  "lastModified": "2025-01-06T20:39:33.220",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 7.8,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 1.8,
        "impactScore": 5.9,
        "source": "nvd@nist.gov",
        "type": "Primary"
      }
    ]
  },
  "published": "2024-05-21T16:15:12.993",
  "references": [
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    },
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      "url": "https://git.kernel.org/stable/c/ec9c7aa08819f976b2492fa63c41b5712d2924b5"
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  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-416"
        }
      ],
      "source": "nvd@nist.gov",
      "type": "Primary"
    }
  ]
}


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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

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  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
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