- Vulnerability/
- CVE-2023-52609
CVE-2023-52609: binder: fix race between mmput() and do_exit()
First published: Mon Mar 18 2024(Updated: )
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.
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 6.1.119-1 6.11.10-1 |
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Reference Links
- https://git.kernel.org/stable/c/252a2a5569eb9f8d16428872cc24dea1ac0bb097
- https://git.kernel.org/stable/c/6696f76c32ff67fec26823fc2df46498e70d9bf3
- https://git.kernel.org/stable/c/67f16bf2cc1698fd50e01ee8a2becc5a8e6d3a3e
- https://git.kernel.org/stable/c/77d210e8db4d61d43b2d16df66b1ec46fad2ee01
- https://git.kernel.org/stable/c/7e7a0d86542b0ea903006d3f42f33c4f7ead6918
- https://git.kernel.org/stable/c/95b1d336b0642198b56836b89908d07b9a0c9608
- https://git.kernel.org/stable/c/98fee5bee97ad47b527a997d5786410430d1f0e9
- https://git.kernel.org/stable/c/9a9ab0d963621d9d12199df9817e66982582d5a5
- https://launchpad.net/bugs/cve/CVE-2023-52609
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-52609
- https://nvd.nist.gov/vuln/detail/CVE-2023-52609
- https://security-tracker.debian.org/tracker/CVE-2023-52609
- https://ubuntu.com/security/CVE-2023-52609
- https://git.kernel.org/linus/9a9ab0d963621d9d12199df9817e66982582d5a5
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