fkie_cve-2022-49607
Vulnerability from fkie_nvd
Published
2025-02-26 07:01
Modified
2025-10-01 20:16
Severity ?
4.7 (Medium) - CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
4.7 (Medium) - CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: perf/core: Fix data race between perf_event_set_output() and perf_mmap_close() Yang Jihing reported a race between perf_event_set_output() and perf_mmap_close(): CPU1 CPU2 perf_mmap_close(e2) if (atomic_dec_and_test(&e2->rb->mmap_count)) // 1 - > 0 detach_rest = true ioctl(e1, IOC_SET_OUTPUT, e2) perf_event_set_output(e1, e2) ... list_for_each_entry_rcu(e, &e2->rb->event_list, rb_entry) ring_buffer_attach(e, NULL); // e1 isn't yet added and // therefore not detached ring_buffer_attach(e1, e2->rb) list_add_rcu(&e1->rb_entry, &e2->rb->event_list) After this; e1 is attached to an unmapped rb and a subsequent perf_mmap() will loop forever more: again: mutex_lock(&e->mmap_mutex); if (event->rb) { ... if (!atomic_inc_not_zero(&e->rb->mmap_count)) { ... mutex_unlock(&e->mmap_mutex); goto again; } } The loop in perf_mmap_close() holds e2->mmap_mutex, while the attach in perf_event_set_output() holds e1->mmap_mutex. As such there is no serialization to avoid this race. Change perf_event_set_output() to take both e1->mmap_mutex and e2->mmap_mutex to alleviate that problem. Additionally, have the loop in perf_mmap() detach the rb directly, this avoids having to wait for the concurrent perf_mmap_close() to get around to doing it to make progress.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/17f5417194136517ee9bbd6511249e5310e5617cPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/3bbd868099287ff9027db59029b502fcfa2202a0Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/43128b3eee337824158f34da6648163d2f2fb937Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/68e3c69803dada336893640110cb87221bb01dcfPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/98c3c8fd0d4c560e0f8335b79c407bbf7fc9462cPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/a9391ff7a7c5f113d6f2bf6621d49110950de49cPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/da3c256e2d0ebc87c7db0c605c9692b6f1722074Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/f836f9ac95df15f1e0af4beb0ec20021e8c91998Patch
Impacted products
Vendor Product Version
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel 5.19
linux linux_kernel 5.19
linux linux_kernel 5.19
linux linux_kernel 5.19
linux linux_kernel 5.19
linux linux_kernel 5.19


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  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nperf/core: Fix data race between perf_event_set_output() and perf_mmap_close()\n\nYang Jihing reported a race between perf_event_set_output() and\nperf_mmap_close():\n\n\tCPU1\t\t\t\t\tCPU2\n\n\tperf_mmap_close(e2)\n\t  if (atomic_dec_and_test(\u0026e2-\u003erb-\u003emmap_count)) // 1 - \u003e 0\n\t    detach_rest = true\n\n\t\t\t\t\t\tioctl(e1, IOC_SET_OUTPUT, e2)\n\t\t\t\t\t\t  perf_event_set_output(e1, e2)\n\n\t  ...\n\t  list_for_each_entry_rcu(e, \u0026e2-\u003erb-\u003eevent_list, rb_entry)\n\t    ring_buffer_attach(e, NULL);\n\t    // e1 isn\u0027t yet added and\n\t    // therefore not detached\n\n\t\t\t\t\t\t    ring_buffer_attach(e1, e2-\u003erb)\n\t\t\t\t\t\t      list_add_rcu(\u0026e1-\u003erb_entry,\n\t\t\t\t\t\t\t\t   \u0026e2-\u003erb-\u003eevent_list)\n\nAfter this; e1 is attached to an unmapped rb and a subsequent\nperf_mmap() will loop forever more:\n\n\tagain:\n\t\tmutex_lock(\u0026e-\u003emmap_mutex);\n\t\tif (event-\u003erb) {\n\t\t\t...\n\t\t\tif (!atomic_inc_not_zero(\u0026e-\u003erb-\u003emmap_count)) {\n\t\t\t\t...\n\t\t\t\tmutex_unlock(\u0026e-\u003emmap_mutex);\n\t\t\t\tgoto again;\n\t\t\t}\n\t\t}\n\nThe loop in perf_mmap_close() holds e2-\u003emmap_mutex, while the attach\nin perf_event_set_output() holds e1-\u003emmap_mutex. As such there is no\nserialization to avoid this race.\n\nChange perf_event_set_output() to take both e1-\u003emmap_mutex and\ne2-\u003emmap_mutex to alleviate that problem. Additionally, have the loop\nin perf_mmap() detach the rb directly, this avoids having to wait for\nthe concurrent perf_mmap_close() to get around to doing it to make\nprogress."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: perf_event_set_output() and perf_mmap_close() Yang Jihing reported a race between perf_event_set_output() and perf_mmap_close(): CPU1 CPU2 perf_mmap_close(e2) if (atomic_dec_and_test(\u0026amp;e2-\u0026gt;rb-\u0026gt;mmap_count)) // 1 - \u0026gt; 0 detach_rest = true ioctl(e1, IOC_SET_OUTPUT, e2) perf_event_set_output(e1, e2) ... list_for_each_entry_rcu(e, \u0026amp;e2-\u0026gt;rb-\u0026gt;event_list, rb_entry) ring_buffer_attach(e, NULL); // e1 isn\u0027t yet added and // therefore not detached ring_buffer_attach(e1, e2-\u0026gt;rb) list_add_rcu(\u0026amp;e1-\u0026gt;rb_entry, \u0026amp;e2-\u0026gt;rb-\u0026gt;event_list) After this; e1 is attached to an unmapped rb and a subsequent perf_mmap() will loop forever more: again: mutex_lock(\u0026amp;e-\u0026gt;mmap_mutex); if (event-\u0026gt;rb) { ... if (!atomic_inc_not_zero(\u0026amp;e-\u0026gt;rb-\u0026gt;mmap_count)) { ... mutex_unlock(\u0026amp;e-\u0026gt;mmap_mutex); goto again; } } The loop in perf_mmap_close() holds e2-\u0026gt;mmap_mutex, while the attach in perf_event_set_output() holds e1-\u0026gt;mmap_mutex. Como tal, no hay serializaci\u00f3n para evitar esta ejecuci\u00f3n. Cambie perf_event_set_output() para que acepte tanto e1-\u0026gt;mmap_mutex como e2-\u0026gt;mmap_mutex para aliviar ese problema. Adem\u00e1s, haga que el bucle en perf_mmap() desconecte el rb directamente, esto evita tener que esperar a que perf_mmap_close() concurrente lo haga para avanzar."
    }
  ],
  "id": "CVE-2022-49607",
  "lastModified": "2025-10-01T20:16:56.077",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "HIGH",
          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 4.7,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H",
          "version": "3.1"
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  "published": "2025-02-26T07:01:36.180",
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  "vulnStatus": "Modified",
  "weaknesses": [
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      "description": [
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          "lang": "en",
          "value": "CWE-362"
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      "source": "nvd@nist.gov",
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      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
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}


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