page_pool: Fix PP_MAGIC_MASK to avoid crashing on some 32-bit arches

{
  "id": "55e96865ac56fbbb044aabef7da0855526c262c4de99bddd821803324c8b9fcc",
  "url": "https://osv.dev/vulnerability/CVE-2025-40199",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "page_pool: Fix PP_MAGIC_MASK to avoid crashing on some 32-bit arches",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: page_pool: Fix PP_MAGIC_MASK to avoid crashing on some 32-bit arches Helge reported that the introduction of PP_MAGIC_MASK let to crashes on boot on his 32-bit parisc machine. The cause of this is the mask is set too wide, so the page_pool_page_is_pp() incurs false positives which crashes the machine. Just disabling the check in page_pool_is_pp() will lead to the page_pool code itself malfunctioning; so instead of doing this, this patch changes the define for PP_DMA_INDEX_BITS to avoid mistaking arbitrary kernel pointers for page_pool-tagged pages. The fix relies on the kernel pointers that alias with the pp_magic field always being above PAGE_OFFSET. With this assumption, we can use the lowest bit of the value of PAGE_OFFSET as the upper bound of the PP_DMA_INDEX_MASK, which should avoid the false positives. Because we cannot rely on PAGE_OFFSET always being a compile-time constant, nor on it always being >0, we fall back to disabling the dma_index storage when there are not enough bits available. This leaves us in the situation we were in before the patch in the Fixes tag, but only on a subset of architecture configurations. This seems to be the best we can do until the transition to page types in complete for page_pool pages. v2: - Make sure there's at least 8 bits available and that the PAGE_OFFSET bit calculation doesn't wrap",
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      "modified": "2026-10-28T02:30:22.871834747Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/15b8a5b4cdc16e9a8bb2a548e12a0fd92997605a",
        "https://git.kernel.org/stable/c/95920c2ed02bde551ab654e9749c2ca7bc3100e0",
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        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/40xxx/CVE-2025-40199.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2025-40199",
        "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
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  "source_id": "core-osv",
  "document_id": 489291,
  "published_at": "2025-11-12T21:56:33.51+00:00"
}