Fix for iov_iter vulnerability in Linux kernel

CVE-2024-50222

What is CVE-2024-50222?

A vulnerability has been identified in the Linux kernel that particularly affects the handling of high memory within x86_32 architectures utilizing the CONFIG_DEBUG_KMAP_LOCAL_FORCE_MAP configuration. The issue arises in the copy_page_from_iter_atomic() function, which can lead to a system hang when managing memory in certain circumstances with tmpfs setups. This occurs under specific conditions where a warning is triggered, indicating a failure to manage memory resources efficiently. The ongoing discussion also raises the question of whether the CONFIG_DEBUG_KMAP_LOCAL_FORCE_MAP option continues to serve a valuable purpose or should be deprecated altogether.

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