cve-2021-46939
Vulnerability from cvelistv5
Published
2024-02-27 18:40
Modified
2024-12-19 07:32
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: tracing: Restructure trace_clock_global() to never block It was reported that a fix to the ring buffer recursion detection would cause a hung machine when performing suspend / resume testing. The following backtrace was extracted from debugging that case: Call Trace: trace_clock_global+0x91/0xa0 __rb_reserve_next+0x237/0x460 ring_buffer_lock_reserve+0x12a/0x3f0 trace_buffer_lock_reserve+0x10/0x50 __trace_graph_return+0x1f/0x80 trace_graph_return+0xb7/0xf0 ? trace_clock_global+0x91/0xa0 ftrace_return_to_handler+0x8b/0xf0 ? pv_hash+0xa0/0xa0 return_to_handler+0x15/0x30 ? ftrace_graph_caller+0xa0/0xa0 ? trace_clock_global+0x91/0xa0 ? __rb_reserve_next+0x237/0x460 ? ring_buffer_lock_reserve+0x12a/0x3f0 ? trace_event_buffer_lock_reserve+0x3c/0x120 ? trace_event_buffer_reserve+0x6b/0xc0 ? trace_event_raw_event_device_pm_callback_start+0x125/0x2d0 ? dpm_run_callback+0x3b/0xc0 ? pm_ops_is_empty+0x50/0x50 ? platform_get_irq_byname_optional+0x90/0x90 ? trace_device_pm_callback_start+0x82/0xd0 ? dpm_run_callback+0x49/0xc0 With the following RIP: RIP: 0010:native_queued_spin_lock_slowpath+0x69/0x200 Since the fix to the recursion detection would allow a single recursion to happen while tracing, this lead to the trace_clock_global() taking a spin lock and then trying to take it again: ring_buffer_lock_reserve() { trace_clock_global() { arch_spin_lock() { queued_spin_lock_slowpath() { /* lock taken */ (something else gets traced by function graph tracer) ring_buffer_lock_reserve() { trace_clock_global() { arch_spin_lock() { queued_spin_lock_slowpath() { /* DEAD LOCK! */ Tracing should *never* block, as it can lead to strange lockups like the above. Restructure the trace_clock_global() code to instead of simply taking a lock to update the recorded "prev_time" simply use it, as two events happening on two different CPUs that calls this at the same time, really doesn't matter which one goes first. Use a trylock to grab the lock for updating the prev_time, and if it fails, simply try again the next time. If it failed to be taken, that means something else is already updating it. Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=212761
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/1fca00920327be96f3318224f502e4d5460f9545Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/2a1bd74b8186d7938bf004f5603f25b84785f63ePatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/6e2418576228eeb12e7ba82edb8f9500623942ffPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/859b47a43f5a0e5b9a92b621dc6ceaad39fb5c8bPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/91ca6f6a91f679c8645d7f3307e03ce86ad518c4Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/a33614d52e97fc8077eb0b292189ca7d964cc534Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/aafe104aa9096827a429bc1358f8260ee565b7ccPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/c64da3294a7d59a4bf6874c664c13be892f15f44Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/d43d56dbf452ccecc1ec735cd4b6840118005d7cPatch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/1fca00920327be96f3318224f502e4d5460f9545Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/2a1bd74b8186d7938bf004f5603f25b84785f63ePatch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/6e2418576228eeb12e7ba82edb8f9500623942ffPatch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/859b47a43f5a0e5b9a92b621dc6ceaad39fb5c8bPatch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/91ca6f6a91f679c8645d7f3307e03ce86ad518c4Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/a33614d52e97fc8077eb0b292189ca7d964cc534Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/aafe104aa9096827a429bc1358f8260ee565b7ccPatch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/c64da3294a7d59a4bf6874c664c13be892f15f44Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/d43d56dbf452ccecc1ec735cd4b6840118005d7cPatch
Impacted products
Vendor Product Version
Linux Linux Version: 2.6.30
Show details on NVD website

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    "cveId": "CVE-2021-46939",
    "datePublished": "2024-02-27T18:40:27.471Z",
    "dateReserved": "2024-02-25T13:45:52.721Z",
    "dateUpdated": "2024-12-19T07:32:12.065Z",
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    "nvd": "{\"cve\":{\"id\":\"CVE-2021-46939\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2024-02-27T19:04:05.873\",\"lastModified\":\"2024-11-21T06:34:58.803\",\"vulnStatus\":\"Modified\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\ntracing: Restructure trace_clock_global() to never block\\n\\nIt was reported that a fix to the ring buffer recursion detection would\\ncause a hung machine when performing suspend / resume testing. The\\nfollowing backtrace was extracted from debugging that case:\\n\\nCall Trace:\\n trace_clock_global+0x91/0xa0\\n __rb_reserve_next+0x237/0x460\\n ring_buffer_lock_reserve+0x12a/0x3f0\\n trace_buffer_lock_reserve+0x10/0x50\\n __trace_graph_return+0x1f/0x80\\n trace_graph_return+0xb7/0xf0\\n ? trace_clock_global+0x91/0xa0\\n ftrace_return_to_handler+0x8b/0xf0\\n ? pv_hash+0xa0/0xa0\\n return_to_handler+0x15/0x30\\n ? ftrace_graph_caller+0xa0/0xa0\\n ? trace_clock_global+0x91/0xa0\\n ? __rb_reserve_next+0x237/0x460\\n ? ring_buffer_lock_reserve+0x12a/0x3f0\\n ? trace_event_buffer_lock_reserve+0x3c/0x120\\n ? trace_event_buffer_reserve+0x6b/0xc0\\n ? trace_event_raw_event_device_pm_callback_start+0x125/0x2d0\\n ? dpm_run_callback+0x3b/0xc0\\n ? pm_ops_is_empty+0x50/0x50\\n ? platform_get_irq_byname_optional+0x90/0x90\\n ? trace_device_pm_callback_start+0x82/0xd0\\n ? dpm_run_callback+0x49/0xc0\\n\\nWith the following RIP:\\n\\nRIP: 0010:native_queued_spin_lock_slowpath+0x69/0x200\\n\\nSince the fix to the recursion detection would allow a single recursion to\\nhappen while tracing, this lead to the trace_clock_global() taking a spin\\nlock and then trying to take it again:\\n\\nring_buffer_lock_reserve() {\\n  trace_clock_global() {\\n    arch_spin_lock() {\\n      queued_spin_lock_slowpath() {\\n        /* lock taken */\\n        (something else gets traced by function graph tracer)\\n          ring_buffer_lock_reserve() {\\n            trace_clock_global() {\\n              arch_spin_lock() {\\n                queued_spin_lock_slowpath() {\\n                /* DEAD LOCK! */\\n\\nTracing should *never* block, as it can lead to strange lockups like the\\nabove.\\n\\nRestructure the trace_clock_global() code to instead of simply taking a\\nlock to update the recorded \\\"prev_time\\\" simply use it, as two events\\nhappening on two different CPUs that calls this at the same time, really\\ndoesn\u0027t matter which one goes first. Use a trylock to grab the lock for\\nupdating the prev_time, and if it fails, simply try again the next time.\\nIf it failed to be taken, that means something else is already updating\\nit.\\n\\n\\nBugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=212761\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: rastreo: reestructurar trace_clock_global() para no bloquear nunca. Se inform\u00f3 que una soluci\u00f3n a la detecci\u00f3n de recursividad del b\u00fafer circular provocar\u00eda que la m\u00e1quina se bloqueara al realizar pruebas de suspensi\u00f3n/reanudaci\u00f3n. El siguiente seguimiento se extrajo de la depuraci\u00f3n de ese caso: Call Trace: trace_clock_global+0x91/0xa0 __rb_reserve_next+0x237/0x460 ring_buffer_lock_reserve+0x12a/0x3f0 trace_buffer_lock_reserve+0x10/0x50 __trace_graph_return+0x1f/0x80 trace_graph_return+0xb7 /0xf0? trace_clock_global+0x91/0xa0 ftrace_return_to_handler+0x8b/0xf0 ? pv_hash+0xa0/0xa0 return_to_handler+0x15/0x30 ? ftrace_graph_caller+0xa0/0xa0? trace_clock_global+0x91/0xa0? __rb_reserve_next+0x237/0x460? ring_buffer_lock_reserve+0x12a/0x3f0? trace_event_buffer_lock_reserve+0x3c/0x120? trace_event_buffer_reserve+0x6b/0xc0? trace_event_raw_event_device_pm_callback_start+0x125/0x2d0? dpm_run_callback+0x3b/0xc0? pm_ops_is_empty+0x50/0x50? platform_get_irq_byname_opcional+0x90/0x90? trace_device_pm_callback_start+0x82/0xd0? dpm_run_callback+0x49/0xc0 Con el siguiente RIP: RIP: 0010:native_queued_spin_lock_slowpath+0x69/0x200 Dado que la soluci\u00f3n a la detecci\u00f3n de recursi\u00f3n permitir\u00eda que ocurriera una sola recursi\u00f3n durante el seguimiento, esto llev\u00f3 a trace_clock_global() a tomar un bloqueo de giro y luego intentarlo para tomarlo de nuevo: ring_buffer_lock_reserve() { trace_clock_global() { arch_spin_lock() { queued_spin_lock_slowpath() { /* bloqueo tomado */ (algo m\u00e1s es rastreado por la funci\u00f3n de seguimiento del gr\u00e1fico) ring_buffer_lock_reserve() { trace_clock_global() { arch_spin_lock() { queued_spin_lock_slowpath () { /* \u00a1BLOQUEO MUERTO! */ El rastreo *nunca* debe bloquearse, ya que puede provocar bloqueos extra\u00f1os como el anterior. Reestructura el c\u00f3digo trace_clock_global() para que, en lugar de simplemente tomar un bloqueo para actualizar el \\\"prev_time\\\" registrado, simplemente lo uses, ya que dos eventos suceden en dos CPU diferentes que llaman a esto al mismo tiempo, realmente no importa cu\u00e1l va primero. Utilice un trylock para obtener el bloqueo para actualizar prev_time y, si falla, simplemente int\u00e9ntelo de nuevo la pr\u00f3xima vez. Si no se pudo tomar, eso significa que algo m\u00e1s ya lo est\u00e1 actualizando. Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=212761\"}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H\",\"baseScore\":5.5,\"baseSeverity\":\"MEDIUM\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":3.6}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-662\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"2.6.30\",\"versionEndExcluding\":\"4.4.269\",\"matchCriteriaId\":\"08CFB593-6583-4E68-8BFB-9326D7B17183\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"4.5.0\",\"versionEndExcluding\":\"4.9.269\",\"matchCriteriaId\":\"8413F613-F1EE-430D-9972-52EEF6C49672\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"4.10.0\",\"versionEndExcluding\":\"4.14.233\",\"matchCriteriaId\":\"20505383-2EB8-41EF-A91B-F185B4FB81DF\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"4.15.0\",\"versionEndExcluding\":\"4.19.191\",\"matchCriteriaId\":\"B7281E1E-A00B-49C0-A849-9CE1CE780227\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"4.20.0\",\"versionEndExcluding\":\"5.4.118\",\"matchCriteriaId\":\"5670AEA3-082C-42D6-A067-CD9ECED4B84B\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.5.0\",\"versionEndExcluding\":\"5.10.36\",\"matchCriteriaId\":\"C7148769-B830-4B8F-986F-E0C85A19FC7F\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.11.0\",\"versionEndExcluding\":\"5.11.20\",\"matchCriteriaId\":\"EFB425F0-C28C-4B44-8B4C-AD512AA832DE\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.12.0\",\"versionEndExcluding\":\"5.12.3\",\"matchCriteriaId\":\"C3814FA3-8141-4313-A852-8C4212BE12AD\"}]}]}],\"references\":[{\"url\":\"https://git.kernel.org/stable/c/1fca00920327be96f3318224f502e4d5460f9545\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/2a1bd74b8186d7938bf004f5603f25b84785f63e\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/6e2418576228eeb12e7ba82edb8f9500623942ff\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/859b47a43f5a0e5b9a92b621dc6ceaad39fb5c8b\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/91ca6f6a91f679c8645d7f3307e03ce86ad518c4\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/a33614d52e97fc8077eb0b292189ca7d964cc534\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/aafe104aa9096827a429bc1358f8260ee565b7cc\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/c64da3294a7d59a4bf6874c664c13be892f15f44\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/d43d56dbf452ccecc1ec735cd4b6840118005d7c\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/1fca00920327be96f3318224f502e4d5460f9545\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/2a1bd74b8186d7938bf004f5603f25b84785f63e\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/6e2418576228eeb12e7ba82edb8f9500623942ff\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/859b47a43f5a0e5b9a92b621dc6ceaad39fb5c8b\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/91ca6f6a91f679c8645d7f3307e03ce86ad518c4\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/a33614d52e97fc8077eb0b292189ca7d964cc534\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/aafe104aa909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  }
}


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