CVE-2023-52609 (GCVE-0-2023-52609)
Vulnerability from cvelistv5
Published
2024-03-18 10:07
Modified
2026-05-11 19:30
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: binder: fix race between mmput() and do_exit() Task A calls binder_update_page_range() to allocate and insert pages on a remote address space from Task B. For this, Task A pins the remote mm via mmget_not_zero() first. This can race with Task B do_exit() and the final mmput() refcount decrement will come from Task A. Task A | Task B ------------------+------------------ mmget_not_zero() | | do_exit() | exit_mm() | mmput() mmput() | exit_mmap() | remove_vma() | fput() | In this case, the work of ____fput() from Task B is queued up in Task A as TWA_RESUME. So in theory, Task A returns to userspace and the cleanup work gets executed. However, Task A instead sleep, waiting for a reply from Task B that never comes (it's dead). This means the binder_deferred_release() is blocked until an unrelated binder event forces Task A to go back to userspace. All the associated death notifications will also be delayed until then. In order to fix this use mmput_async() that will schedule the work in the corresponding mm->async_put_work WQ instead of Task A.
References
Impacted products
Vendor Product Version
Linux Linux Version: 457b9a6f09f011ebcb9b52cc203a6331a6fc2de7
Version: 457b9a6f09f011ebcb9b52cc203a6331a6fc2de7
Version: 457b9a6f09f011ebcb9b52cc203a6331a6fc2de7
Version: 457b9a6f09f011ebcb9b52cc203a6331a6fc2de7
Version: 457b9a6f09f011ebcb9b52cc203a6331a6fc2de7
Version: 457b9a6f09f011ebcb9b52cc203a6331a6fc2de7
Version: 457b9a6f09f011ebcb9b52cc203a6331a6fc2de7
Version: 457b9a6f09f011ebcb9b52cc203a6331a6fc2de7
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