fkie_cve-2024-50032
Vulnerability from fkie_nvd
Published
2024-10-21 20:15
Modified
2024-10-25 15:34
Severity ?
5.5 (Medium) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: rcu/nocb: Fix rcuog wake-up from offline softirq After a CPU has set itself offline and before it eventually calls rcutree_report_cpu_dead(), there are still opportunities for callbacks to be enqueued, for example from a softirq. When that happens on NOCB, the rcuog wake-up is deferred through an IPI to an online CPU in order not to call into the scheduler and risk arming the RT-bandwidth after hrtimers have been migrated out and disabled. But performing a synchronized IPI from a softirq is buggy as reported in the following scenario: WARNING: CPU: 1 PID: 26 at kernel/smp.c:633 smp_call_function_single Modules linked in: rcutorture torture CPU: 1 UID: 0 PID: 26 Comm: migration/1 Not tainted 6.11.0-rc1-00012-g9139f93209d1 #1 Stopper: multi_cpu_stop+0x0/0x320 <- __stop_cpus+0xd0/0x120 RIP: 0010:smp_call_function_single <IRQ> swake_up_one_online __call_rcu_nocb_wake __call_rcu_common ? rcu_torture_one_read call_timer_fn __run_timers run_timer_softirq handle_softirqs irq_exit_rcu ? tick_handle_periodic sysvec_apic_timer_interrupt </IRQ> Fix this with forcing deferred rcuog wake up through the NOCB timer when the CPU is offline. The actual wake up will happen from rcutree_report_cpu_dead().
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/84a5feebba10354c683983f5f1372a144225e4c2Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/e66b1e01f2eb3209d08122572f41f7838b79540dPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/f7345ccc62a4b880cf76458db5f320725f28e400Patch
Impacted products
Vendor Product Version
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel 6.1.113
linux linux_kernel 6.12
linux linux_kernel 6.12


To clipboard 

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  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nrcu/nocb: Fix rcuog wake-up from offline softirq\n\nAfter a CPU has set itself offline and before it eventually calls\nrcutree_report_cpu_dead(), there are still opportunities for callbacks\nto be enqueued, for example from a softirq. When that happens on NOCB,\nthe rcuog wake-up is deferred through an IPI to an online CPU in order\nnot to call into the scheduler and risk arming the RT-bandwidth after\nhrtimers have been migrated out and disabled.\n\nBut performing a synchronized IPI from a softirq is buggy as reported in\nthe following scenario:\n\n        WARNING: CPU: 1 PID: 26 at kernel/smp.c:633 smp_call_function_single\n        Modules linked in: rcutorture torture\n        CPU: 1 UID: 0 PID: 26 Comm: migration/1 Not tainted 6.11.0-rc1-00012-g9139f93209d1 #1\n        Stopper: multi_cpu_stop+0x0/0x320 \u003c- __stop_cpus+0xd0/0x120\n        RIP: 0010:smp_call_function_single\n        \u003cIRQ\u003e\n        swake_up_one_online\n        __call_rcu_nocb_wake\n        __call_rcu_common\n        ? rcu_torture_one_read\n        call_timer_fn\n        __run_timers\n        run_timer_softirq\n        handle_softirqs\n        irq_exit_rcu\n        ? tick_handle_periodic\n        sysvec_apic_timer_interrupt\n        \u003c/IRQ\u003e\n\nFix this with forcing deferred rcuog wake up through the NOCB timer when\nthe CPU is offline. The actual wake up will happen from\nrcutree_report_cpu_dead()."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: rcu/nocb: Se ha corregido la activaci\u00f3n de rcuog desde un softirq sin conexi\u00f3n. Despu\u00e9s de que una CPU se haya desconectado y antes de que finalmente llame a rcutree_report_cpu_dead(), a\u00fan hay oportunidades para que se pongan en cola devoluciones de llamadas, por ejemplo, desde un softirq. Cuando eso sucede en NOCB, la activaci\u00f3n de rcuog se pospone a trav\u00e9s de una IPI a una CPU en l\u00ednea para no llamar al programador y correr el riesgo de armar el ancho de banda RT despu\u00e9s de que los temporizadores hr se hayan migrado y deshabilitado. Pero realizar una IPI sincronizada desde un softirq tiene errores, como se informa en el siguiente escenario: ADVERTENCIA: CPU: 1 PID: 26 en kernel/smp.c:633 smp_call_function_single M\u00f3dulos vinculados en: rcutorture torture CPU: 1 UID: 0 PID: 26 Comm: immigration/1 No contaminado 6.11.0-rc1-00012-g9139f93209d1 #1 Detenedor: multi_cpu_stop+0x0/0x320 \u0026lt;- __stop_cpus+0xd0/0x120 RIP: 0010:smp_call_function_single  swake_up_one_online __call_rcu_nocb_wake __call_rcu_common ? rcu_torture_one_read call_timer_fn __run_timers run_timer_softirq handle_softirqs irq_exit_rcu ? tick_handle_periodic sysvec_apic_timer_interrupt  Solucione esto forzando la activaci\u00f3n diferida de rcuog a trav\u00e9s del temporizador NOCB cuando la CPU est\u00e9 fuera de l\u00ednea. La activaci\u00f3n real se realizar\u00e1 desde rcutree_report_cpu_dead()."
    }
  ],
  "id": "CVE-2024-50032",
  "lastModified": "2024-10-25T15:34:22.353",
  "metrics": {
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          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 5.5,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
          "version": "3.1"
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        "exploitabilityScore": 1.8,
        "impactScore": 3.6,
        "source": "nvd@nist.gov",
        "type": "Primary"
      }
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  "published": "2024-10-21T20:15:16.417",
  "references": [
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      "source": "nvd@nist.gov",
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    }
  ]
}


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