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CVE PROGRAM SOURCE RECORDUnscored

CVE-2023-52609

binder: fix race between mmput() and do_exit()

Read JSON ↗CVE.org ↗
Status
Published
Published
Updated
Assigning organization
Linux

Description

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.

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

Linux Linux

Default version status: unaffected

  • 457b9a6f09f011ebcb9b52cc203a6331a6fc2de7 to < 95b1d336b0642198b56836b89908d07b9a0c9608affected
  • 457b9a6f09f011ebcb9b52cc203a6331a6fc2de7 to < 252a2a5569eb9f8d16428872cc24dea1ac0bb097affected
  • 457b9a6f09f011ebcb9b52cc203a6331a6fc2de7 to < 7e7a0d86542b0ea903006d3f42f33c4f7ead6918affected
  • 457b9a6f09f011ebcb9b52cc203a6331a6fc2de7 to < 98fee5bee97ad47b527a997d5786410430d1f0e9affected
  • 457b9a6f09f011ebcb9b52cc203a6331a6fc2de7 to < 6696f76c32ff67fec26823fc2df46498e70d9bf3affected
  • 457b9a6f09f011ebcb9b52cc203a6331a6fc2de7 to < 67f16bf2cc1698fd50e01ee8a2becc5a8e6d3a3eaffected
  • 457b9a6f09f011ebcb9b52cc203a6331a6fc2de7 to < 77d210e8db4d61d43b2d16df66b1ec46fad2ee01affected
  • 457b9a6f09f011ebcb9b52cc203a6331a6fc2de7 to < 9a9ab0d963621d9d12199df9817e66982582d5a5affected

Linux Linux

Default version status: affected

  • 2.6.29affected
  • 0 to < 2.6.29unaffected
  • 4.19.306 to ≤ 4.19.*unaffected
  • 5.4.268 to ≤ 5.4.*unaffected
  • 5.10.209 to ≤ 5.10.*unaffected
  • 5.15.148 to ≤ 5.15.*unaffected
  • 6.1.75 to ≤ 6.1.*unaffected
  • 6.6.14 to ≤ 6.6.*unaffected
  • 6.7.2 to ≤ 6.7.*unaffected
  • 6.8 to ≤ *unaffected

References