AZL-71242

In the Linux kernel, the following vulnerability has been resolved:

cacheinfo: Fix sharedcpumap to handle shared caches at different levels

The cacheinfo sets up the sharedcpumap by checking whether the caches with the same index are shared between CPUs. However, this will trigger slab-out-of-bounds access if the CPUs do not have the same cache hierarchy. Another problem is the mismatched sharedcpumap when the shared cache does not have the same index between CPUs.

CPU0 I D L3 index 0 1 2 x ^ ^ ^ ^ index 0 1 2 3 CPU1 I D L2 L3

This patch checks each cache is shared with all caches on other CPUs.