cve-2024-40935
Vulnerability from cvelistv5
Published
2024-07-12 12:25
Modified
2024-12-19 09:08
Severity ?
Summary
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.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/320ba9cbca78be79c912143bbba1d1b35ca55cf0
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/3bf0b8030296e9ee60d3d4c15849ad9ac0b47081
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/85e833cd7243bda7285492b0653c3abb1e2e757b
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/e73fac95084839c5178d97e81c6a2051251bdc00
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/320ba9cbca78be79c912143bbba1d1b35ca55cf0
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/3bf0b8030296e9ee60d3d4c15849ad9ac0b47081
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/85e833cd7243bda7285492b0653c3abb1e2e757b
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/e73fac95084839c5178d97e81c6a2051251bdc00
Impacted products
Vendor Product Version
Linux Linux Version: c8383054506c77b814489c09877b5db83fd4abf2
Version: c8383054506c77b814489c09877b5db83fd4abf2
Version: c8383054506c77b814489c09877b5db83fd4abf2
Version: c8383054506c77b814489c09877b5db83fd4abf2
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   Linux Linux Version: 5.19
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