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CVE-2024-39508

Description

In the Linux kernel, the following vulnerability has been resolved:io_uring/io-wq: Use set_bit() and test_bit() at worker->flagsUtilize set_bit() and test_bit() on worker->flags within io_uring/io-wqto address potential data races.The structure io_worker->flags may be accessed through various datapaths, leading to concurrency issues. When KCSAN is enabled, it revealsdata races occurring in io_worker_handle_work andio_wq_activate_free_worker functions. BUG: KCSAN: data-race in io_worker_handle_work / io_wq_activate_free_worker write to 0xffff8885c4246404 of 4 bytes by task 49071 on cpu 28: io_worker_handle_work (io_uring/io-wq.c:434 io_uring/io-wq.c:569) io_wq_worker (io_uring/io-wq.c:?) read to 0xffff8885c4246404 of 4 bytes by task 49024 on cpu 5: io_wq_activate_free_worker (io_uring/io-wq.c:? io_uring/io-wq.c:285) io_wq_enqueue (io_uring/io-wq.c:947) io_queue_iowq (io_uring/io_uring.c:524) io_req_task_submit (io_uring/io_uring.c:1511) io_handle_tw_list (io_uring/io_uring.c:1198)Line numbers against commit 18daea77cca6 ("Merge tag 'for-linus' ofgit://git.kernel.org/pub/scm/virt/kvm/kvm").These races involve writes and reads to the same memory location bydifferent tasks running on different CPUs. To mitigate this, refactorthe code to use atomic operations such as set_bit(), test_bit(), andclear_bit() instead of basic "and" and "or" operations. This ensuresthread-safe manipulation of worker flags.Also, move `create_index` to avoid holes in the structure.

POC

Reference

No PoCs from references.

Github

- https://github.com/bygregonline/devsec-fastapi-report

- https://github.com/robertsirc/sle-bci-demo