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v1 2026-10-26

加固vmalloc重映射空页 · v1

加固remap_vmalloc_range_partial：移除VM_DMA_COHERENT允许项并对vmalloc_to_page() NULL加WARN。

原始补丁链接

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子 Patch（2）

1/2
mm/vmalloc: drop VM_DMA_COHERENT from remap_vmalloc_range_partial
From: Ye Liu liuye@kylinos.cn No caller maps a VM_DMA_COHERENT area through this path: such areas come from dma_alloc_coherent() internals and are freed via vunmap(), never through remap_vmalloc_ra
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mm/vmalloc: warn on NULL page in remap_vmalloc_range_partial
From: Ye Liu liuye@kylinos.cn remap_vmalloc_range_partial() oopses if vmalloc_to_page() returns NULL, which never happens today because VM_USERMAP areas keep every page mapped. Add a WARN_ON(!page)
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