gsd-2023-52447
Vulnerability from gsd
Modified
2024-02-21 06:01
Details
In the Linux kernel, the following vulnerability has been resolved:
bpf: Defer the free of inner map when necessary
When updating or deleting an inner map in map array or map htab, the map
may still be accessed by non-sleepable program or sleepable program.
However bpf_map_fd_put_ptr() decreases the ref-counter of the inner map
directly through bpf_map_put(), if the ref-counter is the last one
(which is true for most cases), the inner map will be freed by
ops->map_free() in a kworker. But for now, most .map_free() callbacks
don't use synchronize_rcu() or its variants to wait for the elapse of a
RCU grace period, so after the invocation of ops->map_free completes,
the bpf program which is accessing the inner map may incur
use-after-free problem.
Fix the free of inner map by invoking bpf_map_free_deferred() after both
one RCU grace period and one tasks trace RCU grace period if the inner
map has been removed from the outer map before. The deferment is
accomplished by using call_rcu() or call_rcu_tasks_trace() when
releasing the last ref-counter of bpf map. The newly-added rcu_head
field in bpf_map shares the same storage space with work field to
reduce the size of bpf_map.
Aliases
{
"gsd": {
"metadata": {
"exploitCode": "unknown",
"remediation": "unknown",
"reportConfidence": "confirmed",
"type": "vulnerability"
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"details": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Defer the free of inner map when necessary\n\nWhen updating or deleting an inner map in map array or map htab, the map\nmay still be accessed by non-sleepable program or sleepable program.\nHowever bpf_map_fd_put_ptr() decreases the ref-counter of the inner map\ndirectly through bpf_map_put(), if the ref-counter is the last one\n(which is true for most cases), the inner map will be freed by\nops-\u003emap_free() in a kworker. But for now, most .map_free() callbacks\ndon\u0027t use synchronize_rcu() or its variants to wait for the elapse of a\nRCU grace period, so after the invocation of ops-\u003emap_free completes,\nthe bpf program which is accessing the inner map may incur\nuse-after-free problem.\n\nFix the free of inner map by invoking bpf_map_free_deferred() after both\none RCU grace period and one tasks trace RCU grace period if the inner\nmap has been removed from the outer map before. The deferment is\naccomplished by using call_rcu() or call_rcu_tasks_trace() when\nreleasing the last ref-counter of bpf map. The newly-added rcu_head\nfield in bpf_map shares the same storage space with work field to\nreduce the size of bpf_map.",
"id": "GSD-2023-52447",
"modified": "2024-02-21T06:01:53.254808Z",
"schema_version": "1.4.0"
}
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Defer the free of inner map when necessary\n\nWhen updating or deleting an inner map in map array or map htab, the map\nmay still be accessed by non-sleepable program or sleepable program.\nHowever bpf_map_fd_put_ptr() decreases the ref-counter of the inner map\ndirectly through bpf_map_put(), if the ref-counter is the last one\n(which is true for most cases), the inner map will be freed by\nops-\u003emap_free() in a kworker. But for now, most .map_free() callbacks\ndon\u0027t use synchronize_rcu() or its variants to wait for the elapse of a\nRCU grace period, so after the invocation of ops-\u003emap_free completes,\nthe bpf program which is accessing the inner map may incur\nuse-after-free problem.\n\nFix the free of inner map by invoking bpf_map_free_deferred() after both\none RCU grace period and one tasks trace RCU grace period if the inner\nmap has been removed from the outer map before. The deferment is\naccomplished by using call_rcu() or call_rcu_tasks_trace() when\nreleasing the last ref-counter of bpf map. The newly-added rcu_head\nfield in bpf_map shares the same storage space with work field to\nreduce the size of bpf_map."
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"value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: bpf: posponer la liberaci\u00f3n del mapa interno cuando sea necesario Al actualizar o eliminar un mapa interno en la matriz de mapas o en el htab de mapas, a\u00fan se puede acceder al mapa mediante un programa que no se puede dormir o un programa que se puede dormir. . Sin embargo, bpf_map_fd_put_ptr() disminuye el contador de referencias del mapa interno directamente a trav\u00e9s de bpf_map_put(), si el contador de referencias es el \u00faltimo (lo cual es cierto en la mayor\u00eda de los casos), el mapa interno ser\u00e1 liberado por ops-\u0026gt;map_free() en un kworker. Pero por ahora, la mayor\u00eda de las devoluciones de llamada .map_free() no usan sincronizar_rcu() o sus variantes para esperar a que transcurra el per\u00edodo de gracia de RCU, por lo que despu\u00e9s de que se completa la invocaci\u00f3n de ops-\u0026gt;map_free, el programa bpf que accede al interior El mapa puede sufrir un problema de uso despu\u00e9s de su liberaci\u00f3n. Corrija la liberaci\u00f3n del mapa interno invocando bpf_map_free_deferred() despu\u00e9s de un per\u00edodo de gracia de RCU y un per\u00edodo de gracia de seguimiento de tareas de RCU si el mapa interno se elimin\u00f3 del mapa externo antes. El aplazamiento se logra utilizando call_rcu() o call_rcu_tasks_trace() al liberar el \u00faltimo contador de referencia del mapa bpf. El campo rcu_head reci\u00e9n agregado en bpf_map comparte el mismo espacio de almacenamiento con el campo de trabajo para reducir el tama\u00f1o de bpf_map."
}
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"id": "CVE-2023-52447",
"lastModified": "2024-03-27T14:15:09.523",
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"baseScore": 7.8,
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"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"
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"source": "nvd@nist.gov",
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"published": "2024-02-22T17:15:08.580",
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}
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