CVE-2021-46990 (GCVE-0-2021-46990)
Vulnerability from cvelistv5
Published
2024-02-28 08:13
Modified
2025-05-04 12:40
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: powerpc/64s: Fix crashes when toggling entry flush barrier The entry flush mitigation can be enabled/disabled at runtime via a debugfs file (entry_flush), which causes the kernel to patch itself to enable/disable the relevant mitigations. However depending on which mitigation we're using, it may not be safe to do that patching while other CPUs are active. For example the following crash: sleeper[15639]: segfault (11) at c000000000004c20 nip c000000000004c20 lr c000000000004c20 Shows that we returned to userspace with a corrupted LR that points into the kernel, due to executing the partially patched call to the fallback entry flush (ie. we missed the LR restore). Fix it by doing the patching under stop machine. The CPUs that aren't doing the patching will be spinning in the core of the stop machine logic. That is currently sufficient for our purposes, because none of the patching we do is to that code or anywhere in the vicinity.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67 https://git.kernel.org/stable/c/0b4eb172cc12dc102cd0ad013e53ee4463db9508 Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67 https://git.kernel.org/stable/c/0c25a7bb697f2e6ee65b6d63782f675bf129511a Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67 https://git.kernel.org/stable/c/2db22ba4e0e103f00e0512e0ecce36ac78c644f8 Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67 https://git.kernel.org/stable/c/5bc00fdda1e934c557351a9c751a205293e68cbf Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67 https://git.kernel.org/stable/c/8382b15864e5014261b4f36c2aa89723612ee058 Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67 https://git.kernel.org/stable/c/aec86b052df6541cc97c5fca44e5934cbea4963b Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67 https://git.kernel.org/stable/c/d2e3590ca39ccfd8a5a46d8c7f095cb6c7b9ae92 Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67 https://git.kernel.org/stable/c/dd0d6117052faace5440db20fc37175efe921c7d Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67 https://git.kernel.org/stable/c/ee4b7aab93c2631c3bb0753023c5dda592bb666b Patch
af854a3a-2127-422b-91ae-364da2661108 https://git.kernel.org/stable/c/0b4eb172cc12dc102cd0ad013e53ee4463db9508 Patch
af854a3a-2127-422b-91ae-364da2661108 https://git.kernel.org/stable/c/0c25a7bb697f2e6ee65b6d63782f675bf129511a Patch
af854a3a-2127-422b-91ae-364da2661108 https://git.kernel.org/stable/c/2db22ba4e0e103f00e0512e0ecce36ac78c644f8 Patch
af854a3a-2127-422b-91ae-364da2661108 https://git.kernel.org/stable/c/5bc00fdda1e934c557351a9c751a205293e68cbf Patch
af854a3a-2127-422b-91ae-364da2661108 https://git.kernel.org/stable/c/8382b15864e5014261b4f36c2aa89723612ee058 Patch
af854a3a-2127-422b-91ae-364da2661108 https://git.kernel.org/stable/c/aec86b052df6541cc97c5fca44e5934cbea4963b Patch
af854a3a-2127-422b-91ae-364da2661108 https://git.kernel.org/stable/c/d2e3590ca39ccfd8a5a46d8c7f095cb6c7b9ae92 Patch
af854a3a-2127-422b-91ae-364da2661108 https://git.kernel.org/stable/c/dd0d6117052faace5440db20fc37175efe921c7d Patch
af854a3a-2127-422b-91ae-364da2661108 https://git.kernel.org/stable/c/ee4b7aab93c2631c3bb0753023c5dda592bb666b Patch
Impacted products
Vendor Product Version
Linux Linux Version: 4a1e90af718d1489ffcecc8f52486c4f5dc0f7a6
Version: fa4bf9f38184ed7ca4916eb64f8c767d1e279c1f
Version: db01cad9efe3c3838a6b3a3f68affd295c4b92d6
Version: f69bb4e51f41973fb7594be1479fa689831efe1a
Version: b65458b6be8032c5179d4f562038575d7b3a6be3
Version: f79643787e0a0762d2409b7b8334e83f22d85695
Version: f79643787e0a0762d2409b7b8334e83f22d85695
Version: f79643787e0a0762d2409b7b8334e83f22d85695
Version: f79643787e0a0762d2409b7b8334e83f22d85695
Version: e590b36718d6e740b7b19514f710402a6499164c
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    "nvd": "{\"cve\":{\"id\":\"CVE-2021-46990\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2024-02-28T09:15:37.733\",\"lastModified\":\"2024-12-26T15:01:41.753\",\"vulnStatus\":\"Analyzed\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\npowerpc/64s: Fix crashes when toggling entry flush barrier\\n\\nThe entry flush mitigation can be enabled/disabled at runtime via a\\ndebugfs file (entry_flush), which causes the kernel to patch itself to\\nenable/disable the relevant mitigations.\\n\\nHowever depending on which mitigation we\u0027re using, it may not be safe to\\ndo that patching while other CPUs are active. For example the following\\ncrash:\\n\\n  sleeper[15639]: segfault (11) at c000000000004c20 nip c000000000004c20 lr c000000000004c20\\n\\nShows that we returned to userspace with a corrupted LR that points into\\nthe kernel, due to executing the partially patched call to the fallback\\nentry flush (ie. we missed the LR restore).\\n\\nFix it by doing the patching under stop machine. The CPUs that aren\u0027t\\ndoing the patching will be spinning in the core of the stop machine\\nlogic. That is currently sufficient for our purposes, because none of\\nthe patching we do is to that code or anywhere in the vicinity.\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se resolvi\u00f3 la siguiente vulnerabilidad: powerpc/64s: soluciona fallas al alternar la barrera de descarga de entrada. La mitigaci\u00f3n de descarga de entrada se puede habilitar/deshabilitar en tiempo de ejecuci\u00f3n a trav\u00e9s de un archivo debugfs (entry_flush), lo que hace que el kernel se parchee a s\u00ed mismo. habilitar/deshabilitar las mitigaciones relevantes. Sin embargo, dependiendo de la mitigaci\u00f3n que estemos usando, puede que no sea seguro aplicar ese parche mientras otras CPU est\u00e1n activas. Por ejemplo, el siguiente bloqueo: durmiente[15639]: segfault (11) en c000000000004c20 nip c000000000004c20 lr c000000000004c20 Muestra que regresamos al espacio de usuario con un LR corrupto que apunta al kernel, debido a la ejecuci\u00f3n de la llamada parcialmente parcheada a la entrada de respaldo descarga ( es decir, nos perdimos la restauraci\u00f3n de LR). Arr\u00e9glelo haciendo el parche debajo de detener la m\u00e1quina. Las CPU que no est\u00e9n aplicando los parches girar\u00e1n en el n\u00facleo de la l\u00f3gica de detenci\u00f3n de la m\u00e1quina. Actualmente, eso es suficiente para nuestros prop\u00f3sitos, porque ninguno de los parches que hacemos se aplica a ese c\u00f3digo ni a ning\u00fan lugar 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      "cveMetadata": "{\"cveId\": \"CVE-2021-46990\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2025-05-04T12:40:44.599Z\", \"dateReserved\": \"2024-02-27T18:42:55.948Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-02-28T08:13:16.569Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.1"
    }
  }
}


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