CVE-2024-40935

In the Linux kernel, the following vulnerability has been resolved: cachefiles: flush all requests after setting CACHEFILES_DEAD In ondemand mode, when the daemon is processing an open request, if the kernel flags the cache as CACHEFILES_DEAD, the cachefiles_daemon_write() will always return -EIO, so the daemon can't pass the copen to the kernel. Then the kernel process that is waiting for the copen triggers a hung_task. Since the DEAD state is irreversible, it can only be exited by closing /dev/cachefiles. Therefore, after calling cachefiles_io_error() to mark the cache as CACHEFILES_DEAD, if in ondemand mode, flush all requests to avoid the above hungtask. We may still be able to read some of the cached data before closing the fd of /dev/cachefiles. Note that this relies on the patch that adds reference counting to the req, otherwise it may UAF.

CVSS

No CVSS.

References

Link	Resource
https://git.kernel.org/stable/c/320ba9cbca78be79c912143bbba1d1b35ca55cf0
https://git.kernel.org/stable/c/3bf0b8030296e9ee60d3d4c15849ad9ac0b47081
https://git.kernel.org/stable/c/85e833cd7243bda7285492b0653c3abb1e2e757b
https://git.kernel.org/stable/c/e73fac95084839c5178d97e81c6a2051251bdc00

Configurations

No configuration.

History

No history.

Information

Published : 2024-07-12 13:15

Updated : 2024-07-12 16:34

NVD link : CVE-2024-40935

Mitre link : CVE-2024-40935

CVE.ORG link : CVE-2024-40935

JSON object : View

Products Affected

No product.

CWE

No CWE.

{"id": "CVE-2024-40935", "cveTags": [], "metrics": {}, "published": "2024-07-12T13:15:16.053", "references": [{"url": "https://git.kernel.org/stable/c/320ba9cbca78be79c912143bbba1d1b35ca55cf0", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/3bf0b8030296e9ee60d3d4c15849ad9ac0b47081", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/85e833cd7243bda7285492b0653c3abb1e2e757b", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/e73fac95084839c5178d97e81c6a2051251bdc00", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "vulnStatus": "Awaiting Analysis", "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ncachefiles: flush all requests after setting CACHEFILES_DEAD\n\nIn ondemand mode, when the daemon is processing an open request, if the\nkernel flags the cache as CACHEFILES_DEAD, the cachefiles_daemon_write()\nwill always return -EIO, so the daemon can't pass the copen to the kernel.\nThen the kernel process that is waiting for the copen triggers a hung_task.\n\nSince the DEAD state is irreversible, it can only be exited by closing\n/dev/cachefiles. Therefore, after calling cachefiles_io_error() to mark\nthe cache as CACHEFILES_DEAD, if in ondemand mode, flush all requests to\navoid the above hungtask. We may still be able to read some of the cached\ndata before closing the fd of /dev/cachefiles.\n\nNote that this relies on the patch that adds reference counting to the req,\notherwise it may UAF."}, {"lang": "es", "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: cachefiles: vac\u00eda todas las solicitudes despu\u00e9s de configurar CACHEFILES_DEAD En modo bajo demanda, cuando el daemon est\u00e1 procesando una solicitud abierta, si el kernel marca el cach\u00e9 como CACHEFILES_DEAD, cachefiles_daemon_write() siempre devolver\u00e1: EIO, por lo que el daemon no puede pasar el copen al kernel. Luego, el proceso del n\u00facleo que est\u00e1 esperando el copen activa una tarea colgada. Dado que el estado DEAD es irreversible, solo se puede salir cerrando /dev/cachefiles. Por lo tanto, despu\u00e9s de llamar a cachefiles_io_error() para marcar el cach\u00e9 como CACHEFILES_DEAD, si est\u00e1 en modo bajo demanda, vac\u00ede todas las solicitudes para evitar la tarea suspendida anterior. Es posible que a\u00fan podamos leer algunos de los datos almacenados en cach\u00e9 antes de cerrar el fd de /dev/cachefiles. Tenga en cuenta que esto depende del parche que agrega el recuento de referencias al requisito; de lo contrario, puede ser UAF."}], "lastModified": "2024-07-12T16:34:58.687", "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}