CVE-2024-41051: cachefiles: wait for ondemand_object_worker to finish when dropping object
First published: Mon Jul 29 2024(Updated: )
In the Linux kernel, the following vulnerability has been resolved: cachefiles: wait for ondemand_object_worker to finish when dropping object When queuing ondemand_object_worker() to re-open the object, cachefiles_object is not pinned. The cachefiles_object may be freed when the pending read request is completed intentionally and the related erofs is umounted. If ondemand_object_worker() runs after the object is freed, it will incur use-after-free problem as shown below. process A processs B process C process D cachefiles_ondemand_send_req() // send a read req X // wait for its completion // close ondemand fd cachefiles_ondemand_fd_release() // set object as CLOSE cachefiles_ondemand_daemon_read() // set object as REOPENING queue_work(fscache_wq, &info->ondemand_work) // close /dev/cachefiles cachefiles_daemon_release cachefiles_flush_reqs complete(&req->done) // read req X is completed // umount the erofs fs cachefiles_put_object() // object will be freed cachefiles_ondemand_deinit_obj_info() kmem_cache_free(object) // both info and object are freed ondemand_object_worker() When dropping an object, it is no longer necessary to reopen the object, so use cancel_work_sync() to cancel or wait for ondemand_object_worker() to finish.
Credit: 416baaa9-dc9f-4396-8d5f-8c081fb06d67 416baaa9-dc9f-4396-8d5f-8c081fb06d67
| Affected Software | Affected Version | How to fix |
|---|---|---|
| debian/linux | 5.10.223-1 5.10.226-1 6.1.115-1 6.1.112-1 6.11.7-1 |
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Reference Links
- https://git.kernel.org/stable/c/12e009d60852f7bce0afc373ca0b320f14150418
- https://git.kernel.org/stable/c/b26525b2183632f16a3a4108fe6a4bfa8afac6ed
- https://git.kernel.org/stable/c/d3179bae72b1b5e555ba839d6d9f40a350a4d78a
- https://git.kernel.org/stable/c/ec9289369259d982e735a71437e32e6b4035290c
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2024-41051
- https://nvd.nist.gov/vuln/detail/CVE-2024-41051
- https://launchpad.net/bugs/cve/CVE-2024-41051
- https://security-tracker.debian.org/tracker/CVE-2024-41051
- https://ubuntu.com/security/CVE-2024-41051
- https://git.kernel.org/linus/12e009d60852f7bce0afc373ca0b320f14150418
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