rcu-tasks: Fix access non-existent percpu rtpcp variable in rcu_tasks_need_gpcb()

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Linux kernel 安全漏洞

Linux kernel is the kernel used by Linux, the open source operating system of the Linux Foundation in the United States. A security vulnerability exists in Linux kernel that originates from the rcu-tasks module incorrectly accessing a non-existent per-CPU rtpcp variable in the rcutasksneedgpcb...

PT-2024-33767

Name of the Vulnerable Software and Affected Versions: Linux kernel versions prior to 6.6.21 Description: The issue is related to the rcu-tasks component in the Linux kernel, specifically with the rcu tasks need gpcb function. When the kernel is built with CONFIG FORCE NR CPUS=y, it can lead to a...