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| 字段 | 内容 |
|---|---|
| 缺陷编号 | 2108303212798 |
| 缺陷描述 | Out-of-bounds read - Function call "cpumask_next(cpu, (struct cpumask const *)&__cpu_possible_mask)" may return 1024. Overrunning array "__per_cpu_offset" of 1024 8-byte elements at element index 1024 (byte offset 8199) using index "cpu" (which evaluates to 1024) |
| 缺陷类型 | Memory - illegal accesses |
| 影响程度 | High |
| 处理结果 | Unclassfied |
| EntryPoint | armpmu_find_irq_ops |
| FileName | drivers/perf/arm_pmu.c:644 |
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PER_CPU变量内存大小由NR_CPUS决定，根据以下相关宏定义：
#define for_each_possible_cpu(cpu) for_each_cpu((cpu), cpu_possible_mask)
#define for_each_cpu(cpu, mask)
for ((cpu) = -1;
(cpu) = cpumask_next((cpu), (mask)),
(cpu) < nr_cpu_ids;)
cpu_possible_mask范围由NR_CPUS决定，在cpu取值范围内不会对PER_CPU地址造成越界访问，即cpu的值不会超过1024
已确认非问题
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