CVE-2021-46971
Vulnerability from cvelistv5
Published
2024-02-27 18:47
Modified
2024-11-04 11:56
Severity ?
EPSS score ?
Summary
perf/core: Fix unconditional security_locked_down() call
References
Impacted products
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While that doesn\u0027t matter in case of the Lockdown LSM,\nit causes trouble with the SELinux\u0027s lockdown hook implementation.\n\nSELinux implements the locked_down hook with a check whether the current\ntask\u0027s type has the corresponding \"lockdown\" class permission\n(\"integrity\" or \"confidentiality\") allowed in the policy. This means\nthat calling the hook when the access control decision would be ignored\ngenerates a bogus permission check and audit record.\n\nFix this by checking sample_type first and only calling the hook when\nits result would be honored." } ], "providerMetadata": { "dateUpdated": "2024-11-04T11:56:54.535Z", "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux" }, "references": [ { "url": "https://git.kernel.org/stable/c/b246759284d6a2bc5b6f1009caeeb3abce2ec9ff" }, { "url": "https://git.kernel.org/stable/c/4348d3b5027bc3ff6336368b6c60605d4ef8e1ce" }, { "url": "https://git.kernel.org/stable/c/f5809ca4c311b71bfaba6d13f4e39eab0557895e" }, { "url": "https://git.kernel.org/stable/c/c7b0208ee370b89d20486fae71cd9abb759819c1" }, { "url": "https://git.kernel.org/stable/c/08ef1af4de5fe7de9c6d69f1e22e51b66e385d9b" } ], "title": "perf/core: Fix unconditional security_locked_down() call", "x_generator": { "engine": "bippy-9e1c9544281a" } } }, "cveMetadata": { "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "assignerShortName": "Linux", "cveId": "CVE-2021-46971", "datePublished": "2024-02-27T18:47:06.674Z", "dateReserved": "2024-02-27T18:42:55.943Z", "dateUpdated": "2024-11-04T11:56:54.535Z", "state": "PUBLISHED" }, "dataType": "CVE_RECORD", "dataVersion": "5.1", "meta": { "nvd": "{\"cve\":{\"id\":\"CVE-2021-46971\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2024-02-27T19:04:07.343\",\"lastModified\":\"2024-02-28T14:06:45.783\",\"vulnStatus\":\"Awaiting Analysis\",\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nperf/core: Fix unconditional security_locked_down() call\\n\\nCurrently, the lockdown state is queried unconditionally, even though\\nits result is used only if the PERF_SAMPLE_REGS_INTR bit is set in\\nattr.sample_type. While that doesn\u0027t matter in case of the Lockdown LSM,\\nit causes trouble with the SELinux\u0027s lockdown hook implementation.\\n\\nSELinux implements the locked_down hook with a check whether the current\\ntask\u0027s type has the corresponding \\\"lockdown\\\" class permission\\n(\\\"integrity\\\" or \\\"confidentiality\\\") allowed in the policy. This means\\nthat calling the hook when the access control decision would be ignored\\ngenerates a bogus permission check and audit record.\\n\\nFix this by checking sample_type first and only calling the hook when\\nits result would be honored.\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se resolvi\u00f3 la siguiente vulnerabilidad: perf/core: corrige la llamada incondicional a security_locked_down() Actualmente, el estado de bloqueo se consulta incondicionalmente, aunque su resultado se usa solo si el bit PERF_SAMPLE_REGS_INTR est\u00e1 establecido en attr.sample_type. Si bien eso no importa en el caso del Lockdown LSM, causa problemas con la implementaci\u00f3n del gancho de bloqueo de SELinux. SELinux implementa el gancho lock_down comprobando si el tipo de tarea actual tiene el correspondiente permiso de clase de \\\"bloqueo\\\" (\\\"integridad\\\" o \\\"confidencialidad\\\") permitido en la pol\u00edtica. Esto significa que llamar al enlace cuando se ignorar\u00eda la decisi\u00f3n de control de acceso genera una verificaci\u00f3n de permisos y un registro de auditor\u00eda falsos. Solucione este problema verificando sample_type primero y solo llamando al gancho cuando se respete su resultado.\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/08ef1af4de5fe7de9c6d69f1e22e51b66e385d9b\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/4348d3b5027bc3ff6336368b6c60605d4ef8e1ce\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/b246759284d6a2bc5b6f1009caeeb3abce2ec9ff\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/c7b0208ee370b89d20486fae71cd9abb759819c1\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/f5809ca4c311b71bfaba6d13f4e39eab0557895e\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}" } }
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Sightings
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Nomenclature
- Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
- Confirmed: The vulnerability is confirmed from an analyst perspective.
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- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.