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CVE-2022-39188: mmu_gather: Force tlb-flush VM_PFNMAP vmas · torvalds/linux@b67fbeb

An issue was discovered in include/asm-generic/tlb.h in the Linux kernel before 5.19. Because of a race condition (unmap_mapping_range versus munmap), a device driver can free a page while it still has stale TLB entries. This only occurs in situations with VM_PFNMAP VMAs.

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mmu_gather: Force tlb-flush VM_PFNMAP vmas

Jann reported a race between munmap() and unmap_mapping_range(), where unmap_mapping_range() will no-op once unmap_vmas() has unlinked the VMA; however munmap() will not yet have invalidated the TLBs.

Therefore unmap_mapping_range() will complete while there are still (stale) TLB entries for the specified range.

Mitigate this by force flushing TLBs for VM_PFNMAP ranges.

Signed-off-by: Peter Zijlstra (Intel) [email protected] Acked-by: Will Deacon [email protected] Signed-off-by: Linus Torvalds [email protected]

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