Informazioni sul CVE-2024-36028
mm/hugetlb: fix DEBUG_LOCKS_WARN_ON(1) when dissolve_free_hugetlb_folio()
CWE ID: N/A
Base Score (CVSS): N/A
CVE: CVE-2024-36028
Descrizione: This is a very insightful and well-explained snippet of a crash report. Let’s break down the core issue and its implications. **The Problem: Union of `_deferred_list` and `_hugetlb_subpool`** The core of the problem is a race condition within the `__update_and_free_hugetlb_folio()` function. This function is responsible for freeing a large data structure (likely a hash table or similar) called `_hugetlb_subpool`. The issue is that the `_deferred_list` field within this structure is being updated concurrently with the `_hugetlb_subpool` being freed. This leads to data corruption and a crash. **Why This Happens (Simplified Explanation)** 1. **Concurrent Updates:** The `__update_and_free_hugetlb_folio()` function is likely updating the `_hugetlb_subpool` data structure. 2. **`_deferred_list` is Modified:** Simultaneously, the `_deferred_list` field within the `_hugetlb_subpool` structure is being modified. 3. **Union:** The `_deferred_list` field is then unioned with the `_hugetlb_subpool` field. This means that the `_deferred_list` now *contains* the entire contents of `_hugetlb_subpool`. 4. **Data Corruption:** The subsequent `free()` operation attempts to release the `_hugetlb_subpool` data, but because the `_deferred_list` now contains the entire data, the release fails. **Why This is a Crash** The crash likely occurs when the `free()` operation attempts to release the data that’s now contained within the `_deferred_list` field. The union operation creates a logical inconsistency, and the system can’t reliably determine the size or validity of the data. **Key Takeaways & Implications** * **Race Condition:** This is a classic race condition – multiple threads or processes accessing and modifying shared data simultaneously in a way that leads to unpredictable results. * **Data Integrity:** The crash highlights a critical issue with data integrity. The system is relying on the correct order of operations to ensure the data is freed correctly. * **`_deferred_list` Importance:** The `_deferred_list` field is a significant part of the data structure being freed. Its integrity is crucial for the overall functionality of the system. **Further Investigation (Based on the Information Provided)** * **Context is Critical:** To fully understand the problem, we need more context about: * **The System:** What system is this code running in? (e.g., a database, a file system, a network service) * **The Code:** Where does this function reside? What is its purpose? * **The Threading Model:** Is this code running in a single-threaded or multi-threaded environment? * **The Data Structure:** What is `_hugetlb_subpool`? What does it contain? **In short, the crash is a consequence of a race condition that corrupts data when updating a shared data structure.** — Do you want me to elaborate on any of these points, perhaps by discussing potential solutions or debugging strategies?
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Riferimenti esterni
- https://git.kernel.org/stable/c/2effe407f7563add41750fd7e03da4ea44b98099
- https://git.kernel.org/stable/c/7e0a322877416e8c648819a8e441cf8c790b2cce
- https://git.kernel.org/stable/c/9c9b32d46afab2d911897914181c488954012300
- https://git.kernel.org/stable/c/52ccdde16b6540abe43b6f8d8e1e1ec90b0983af
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