fkie_cve-2022-50103
Vulnerability from fkie_nvd
Published
2025-06-18 11:15
Modified
2025-06-18 13:47
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: sched, cpuset: Fix dl_cpu_busy() panic due to empty cs->cpus_allowed With cgroup v2, the cpuset's cpus_allowed mask can be empty indicating that the cpuset will just use the effective CPUs of its parent. So cpuset_can_attach() can call task_can_attach() with an empty mask. This can lead to cpumask_any_and() returns nr_cpu_ids causing the call to dl_bw_of() to crash due to percpu value access of an out of bound CPU value. For example: [80468.182258] BUG: unable to handle page fault for address: ffffffff8b6648b0 : [80468.191019] RIP: 0010:dl_cpu_busy+0x30/0x2b0 : [80468.207946] Call Trace: [80468.208947] cpuset_can_attach+0xa0/0x140 [80468.209953] cgroup_migrate_execute+0x8c/0x490 [80468.210931] cgroup_update_dfl_csses+0x254/0x270 [80468.211898] cgroup_subtree_control_write+0x322/0x400 [80468.212854] kernfs_fop_write_iter+0x11c/0x1b0 [80468.213777] new_sync_write+0x11f/0x1b0 [80468.214689] vfs_write+0x1eb/0x280 [80468.215592] ksys_write+0x5f/0xe0 [80468.216463] do_syscall_64+0x5c/0x80 [80468.224287] entry_SYSCALL_64_after_hwframe+0x44/0xae Fix that by using effective_cpus instead. For cgroup v1, effective_cpus is the same as cpus_allowed. For v2, effective_cpus is the real cpumask to be used by tasks within the cpuset anyway. Also update task_can_attach()'s 2nd argument name to cs_effective_cpus to reflect the change. In addition, a check is added to task_can_attach() to guard against the possibility that cpumask_any_and() may return a value >= nr_cpu_ids.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/147f66d22f58712dce7ccdd6a1f6cb3ee8042df4
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/336626564b58071b8980a4e6a31a8f5d92705d9b
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/357f3f0e522a6ce1ce4a571cb780d9861d53bec7
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/b6e8d40d43ae4dec00c8fea2593eeea3114b8f44
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/f56607b44c9896e51678a7e8cdd3a5479f4b4548
Impacted products
Vendor Product Version


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{
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nsched, cpuset: Fix dl_cpu_busy() panic due to empty cs-\u003ecpus_allowed\n\nWith cgroup v2, the cpuset\u0027s cpus_allowed mask can be empty indicating\nthat the cpuset will just use the effective CPUs of its parent. So\ncpuset_can_attach() can call task_can_attach() with an empty mask.\nThis can lead to cpumask_any_and() returns nr_cpu_ids causing the call\nto dl_bw_of() to crash due to percpu value access of an out of bound\nCPU value. For example:\n\n\t[80468.182258] BUG: unable to handle page fault for address: ffffffff8b6648b0\n\t  :\n\t[80468.191019] RIP: 0010:dl_cpu_busy+0x30/0x2b0\n\t  :\n\t[80468.207946] Call Trace:\n\t[80468.208947]  cpuset_can_attach+0xa0/0x140\n\t[80468.209953]  cgroup_migrate_execute+0x8c/0x490\n\t[80468.210931]  cgroup_update_dfl_csses+0x254/0x270\n\t[80468.211898]  cgroup_subtree_control_write+0x322/0x400\n\t[80468.212854]  kernfs_fop_write_iter+0x11c/0x1b0\n\t[80468.213777]  new_sync_write+0x11f/0x1b0\n\t[80468.214689]  vfs_write+0x1eb/0x280\n\t[80468.215592]  ksys_write+0x5f/0xe0\n\t[80468.216463]  do_syscall_64+0x5c/0x80\n\t[80468.224287]  entry_SYSCALL_64_after_hwframe+0x44/0xae\n\nFix that by using effective_cpus instead. For cgroup v1, effective_cpus\nis the same as cpus_allowed. For v2, effective_cpus is the real cpumask\nto be used by tasks within the cpuset anyway.\n\nAlso update task_can_attach()\u0027s 2nd argument name to cs_effective_cpus to\nreflect the change. In addition, a check is added to task_can_attach()\nto guard against the possibility that cpumask_any_and() may return a\nvalue \u003e= nr_cpu_ids."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: sched, cpuset: Se solucion\u00f3 el p\u00e1nico de dl_cpu_busy() debido a un valor de cs-\u0026gt;cpus_allowed vac\u00edo. Con cgroup v2, la m\u00e1scara cpus_allowed de cpuset puede estar vac\u00eda, lo que indica que solo usar\u00e1 las CPU efectivas de su padre. Por lo tanto, cpuset_can_attach() puede llamar a task_can_attach() con una m\u00e1scara vac\u00eda. Esto puede provocar que cpumask_any_and() devuelva nr_cpu_ids, lo que provoca el bloqueo de la llamada a dl_bw_of() debido al acceso a un valor de CPU fuera de los l\u00edmites. Por ejemplo: [80468.182258] ERROR: no se puede manejar el error de p\u00e1gina para la direcci\u00f3n: ffffffff8b6648b0 : [80468.191019] RIP: 0010:dl_cpu_busy+0x30/0x2b0 : [80468.207946] Rastreo de llamadas: [80468.208947] cpuset_can_attach+0xa0/0x140 [80468.209953] cgroup_migrate_execute+0x8c/0x490 [80468.210931] cgroup_update_dfl_csses+0x254/0x270 [80468.211898] Solucione esto utilizando effective_cpus en su lugar. Para cgroup v1, effective_cpus es igual que cpus_allowed. Para v2, effective_cpus es la m\u00e1scara de CPU real que usar\u00e1n las tareas dentro del conjunto de CPU. Actualice tambi\u00e9n el segundo argumento de task_can_attach() a cs_effective_cpus para reflejar el cambio. Adem\u00e1s, se ha a\u00f1adido una comprobaci\u00f3n a task_can_attach() para evitar que cpumask_any_and() devuelva un valor mayor que nr_cpu_ids."
    }
  ],
  "id": "CVE-2022-50103",
  "lastModified": "2025-06-18T13:47:40.833",
  "metrics": {},
  "published": "2025-06-18T11:15:39.670",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/147f66d22f58712dce7ccdd6a1f6cb3ee8042df4"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/336626564b58071b8980a4e6a31a8f5d92705d9b"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/357f3f0e522a6ce1ce4a571cb780d9861d53bec7"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/b6e8d40d43ae4dec00c8fea2593eeea3114b8f44"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/f56607b44c9896e51678a7e8cdd3a5479f4b4548"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Awaiting Analysis"
}


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