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CVE-2022-49607

Estado: ModificadaMedia (4.7)—

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():

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)

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After this; e1 is attached to an unmapped rb and a subsequent perf_mmap() will loop forever more:

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.

Detalles técnicos trazas, registros y código del informe original
	CPU1					CPU2

	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;
			}
		}

CVSS

Probabilidad de explotación (EPSS)

EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).

Tecnologías afectadas (1)

Linux — Linux Kernel

CWE

Referencias

JSON original (NVD)

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    {
      "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(&e2->rb->mmap_count)) // 1 - > 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, &e2->rb->event_list, rb_entry)\n\t    ring_buffer_attach(e, NULL);\n\t    // e1 isn't yet added and\n\t    // therefore not detached\n\n\t\t\t\t\t\t    ring_buffer_attach(e1, e2->rb)\n\t\t\t\t\t\t      list_add_rcu(&e1->rb_entry,\n\t\t\t\t\t\t\t\t   &e2->rb->event_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(&e->mmap_mutex);\n\t\tif (event->rb) {\n\t\t\t...\n\t\t\tif (!atomic_inc_not_zero(&e->rb->mmap_count)) {\n\t\t\t\t...\n\t\t\t\tmutex_unlock(&e->mmap_mutex);\n\t\t\t\tgoto again;\n\t\t\t}\n\t\t}\n\nThe loop in perf_mmap_close() holds e2->mmap_mutex, while the attach\nin perf_event_set_output() holds e1->mmap_mutex. As such there is no\nserialization to avoid this race.\n\nChange perf_event_set_output() to take both e1->mmap_mutex and\ne2->mmap_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(&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. Como tal, no hay serialización para evitar esta ejecución. Cambie perf_event_set_output() para que acepte tanto e1->mmap_mutex como e2->mmap_mutex para aliviar ese problema. Además, 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."
    }
  ],
  "lastModified": "2026-06-17T05:18:36.740",
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