ghsa-rqgv-9mjq-566p
Vulnerability from github
Published
2024-07-12 15:31
Modified
2024-07-12 15:31
Details

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.

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{
   affected: [],
   aliases: [
      "CVE-2024-40935",
   ],
   database_specific: {
      cwe_ids: [],
      github_reviewed: false,
      github_reviewed_at: null,
      nvd_published_at: "2024-07-12T13:15:16Z",
      severity: null,
   },
   details: "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.",
   id: "GHSA-rqgv-9mjq-566p",
   modified: "2024-07-12T15:31:28Z",
   published: "2024-07-12T15:31:28Z",
   references: [
      {
         type: "ADVISORY",
         url: "https://nvd.nist.gov/vuln/detail/CVE-2024-40935",
      },
      {
         type: "WEB",
         url: "https://git.kernel.org/stable/c/320ba9cbca78be79c912143bbba1d1b35ca55cf0",
      },
      {
         type: "WEB",
         url: "https://git.kernel.org/stable/c/3bf0b8030296e9ee60d3d4c15849ad9ac0b47081",
      },
      {
         type: "WEB",
         url: "https://git.kernel.org/stable/c/85e833cd7243bda7285492b0653c3abb1e2e757b",
      },
      {
         type: "WEB",
         url: "https://git.kernel.org/stable/c/e73fac95084839c5178d97e81c6a2051251bdc00",
      },
   ],
   schema_version: "1.4.0",
   severity: [],
}


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