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CVE PROGRAM SOURCE RECORD7.8 High

CVE-2024-57945

riscv: mm: Fix the out of bound issue of vmemmap address

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Status
Published
Published
Updated
Assigning organization
Linux

Description

In the Linux kernel, the following vulnerability has been resolved: riscv: mm: Fix the out of bound issue of vmemmap address In sparse vmemmap model, the virtual address of vmemmap is calculated as: ((struct page *)VMEMMAP_START - (phys_ram_base >> PAGE_SHIFT)). And the struct page's va can be calculated with an offset: (vmemmap + (pfn)). However, when initializing struct pages, kernel actually starts from the first page from the same section that phys_ram_base belongs to. If the first page's physical address is not (phys_ram_base >> PAGE_SHIFT), then we get an va below VMEMMAP_START when calculating va for it's struct page. For example, if phys_ram_base starts from 0x82000000 with pfn 0x82000, the first page in the same section is actually pfn 0x80000. During init_unavailable_range(), we will initialize struct page for pfn 0x80000 with virtual address ((struct page *)VMEMMAP_START - 0x2000), which is below VMEMMAP_START as well as PCI_IO_END. This commit fixes this bug by introducing a new variable 'vmemmap_start_pfn' which is aligned with memory section size and using it to calculate vmemmap address instead of phys_ram_base.

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

Linux Linux

Default version status: unaffected

  • 8af1c121b0102041809bc137ec600d1865eaeedd to < 04350304428063da6a55a8a4597d409dc69148b2affected
  • 8310080799b40fd9f2a8b808c657269678c149af to < 92f08673d3f1893191323572f60e3c62f2e57c2faffected
  • a278d5c60f21aa15d540abb2f2da6e6d795c3e6e to < a4a7ac3d266008018f05fae53060fcb331151a14affected
  • a11dd49dcb9376776193e15641f84fcc1e5980c9 to < d2bd51954ac8377c2f1eb1813e694788998add66affected
  • a11dd49dcb9376776193e15641f84fcc1e5980c9 to < f754f27e98f88428aaf6be6e00f5cbce97f62d4baffected
  • 5941a90c55d3bfba732b32208d58d997600b44efaffected
  • 2a1728c15ec4f45ed9248ae22f626541c179bfbeaffected
  • 5.10.212 to < 5.10.258affected
  • 6.1.81 to < 6.1.140affected
  • 6.6.21 to < 6.6.72affected
  • 5.15.151 to < 5.16affected
  • 6.7.9 to < 6.8affected

Linux Linux

Default version status: affected

  • 6.8affected
  • 0 to < 6.8unaffected
  • 5.10.258 to ≤ 5.10.*unaffected
  • 6.1.140 to ≤ 6.1.*unaffected
  • 6.6.72 to ≤ 6.6.*unaffected
  • 6.12.10 to ≤ 6.12.*unaffected
  • 6.13 to ≤ *unaffected

References