Description (CNA)
In the Linux kernel, the following vulnerability has been resolved: exit: prevent preemption of oopsing TASK_DEAD task When an already-exiting task oopses, make_task_dead() currently calls do_task_dead() with preemption enabled. That is forbidden: do_task_dead() calls __schedule(), which has a comment saying "WARNING: must be called with preemption disabled!". If an oopsing task is preempted in do_task_dead(), between becoming TASK_DEAD and entering the scheduler explicitly, bad things happen: finish_task_switch() assumes that once the scheduler has switched away from a TASK_DEAD task, the task can never run again and its stack is no longer needed; but that assumption apparently doesn't hold if the dead task was preempted (the SM_PREEMPT case). This means that the scheduler ends up repeatedly dropping references on the dead task's stack, which can lead to use-after-free or double-free of the entire task stack; in other words, two tasks can end up running on the same stack, resulting in various kinds of memory corruption. (This does not just affect "recursively oopsing" tasks; it is enough to oops once during task exit, for example in a file_operations::release handler)
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected 7f80a2fd7db9a55894fd841915236aca611291b5 before 3d6fb8a7690c23e3213c4b008f64d89a44b98737; affected 7f80a2fd7db9a55894fd841915236aca611291b5 before 640b4c00fb0e2920327435f6176cbefc3c546165; affected 7f80a2fd7db9a55894fd841915236aca611291b5 before 7b2800ba5f5f77a8ee7f4cbadb19cf1264597a34; affected 7f80a2fd7db9a55894fd841915236aca611291b5 before 6f49f94f3b11fe8bff1bf2a054143789e76aaf17; affected 7f80a2fd7db9a55894fd841915236aca611291b5 before 9756b3db5db6c2f5eccb32dddbd88eb4c54f575e; affected 7f80a2fd7db9a55894fd841915236aca611291b5 before c1fa0bb633e4a6b11e83ffc57fa5abe8ebb87891 |
| Linux / Linux | affected 5.17; unaffected 0 before 5.17; unaffected 6.1.175 through 6.1.*; unaffected 6.6.140 through 6.6.*; unaffected 6.12.88 through 6.12.*; unaffected 6.18.30 through 6.18.*; unaffected 7.0.7 through 7.0.*; unaffected 7.1 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/3d6fb8a7690c23e3213c4b008f64d89a44b98737
- https://git.kernel.org/stable/c/640b4c00fb0e2920327435f6176cbefc3c546165
- https://git.kernel.org/stable/c/7b2800ba5f5f77a8ee7f4cbadb19cf1264597a34
- https://git.kernel.org/stable/c/6f49f94f3b11fe8bff1bf2a054143789e76aaf17
- https://git.kernel.org/stable/c/9756b3db5db6c2f5eccb32dddbd88eb4c54f575e
- https://git.kernel.org/stable/c/c1fa0bb633e4a6b11e83ffc57fa5abe8ebb87891
- https://project-zero.issues.chromium.org/issues/510793286
ADP enrichment
No English description supplied.
No English description supplied.
No references supplied.