Linux Kernel Crash Fix: CONFIG_FORCE_NR_CPUS=y nr_cpu_ids Mismatch in RCU Tasks

From this webpage screenshot, we can extract the following key information about the vulnerability: 1. Vulnerability Description: - Issue Description: For kernels compiled with , is defined as instead of the actual number of CPUs, which leads to system crashes. - Error Messages: The system crash displays error messages such as and . 2. Trigger Conditions: - Trigger Condition: When the kernel is compiled with , and is incorrectly defined as rather than the actual CPU count. 3. Mitigation Measures: - Mitigation: Fixed the issue of accessing a non-existent variable by adding a check in the function to ensure the correct CPU count is used when handling the structure. 4. Patch Content: - Patch Content: The patch adds a check for the structure to ensure the correct CPU count is used during processing. 5. Patch Application: - Patch Application: The patch is applied in the file by modifying the definition and processing logic of the structure. 6. Patch Effect: - Patch Effect: Resolves the system crash caused by the incorrect definition of , ensuring correctness in kernel handling of the structure. With this information, we can understand the trigger conditions, mitigation measures, and specific patch application details, thereby gaining a clearer understanding of the vulnerability's nature and its fix.

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Linux Kernel Crash Fix: CONFIG_FORCE_NR_CPUS=y nr_cpu_ids Mismatch in RCU Tasks