CVE-2024-57945 (GCVE-0-2024-57945)

Vulnerability from cvelistv5 – Published: 2025-01-21 12:18 – Updated: 2025-11-03 19:32
VLAI?
Title
riscv: mm: Fix the out of bound issue of vmemmap address
Summary
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.
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 8310080799b40fd9f2a8b808c657269678c149af , < 92f08673d3f1893191323572f60e3c62f2e57c2f (git)
Affected: a278d5c60f21aa15d540abb2f2da6e6d795c3e6e , < a4a7ac3d266008018f05fae53060fcb331151a14 (git)
Affected: a11dd49dcb9376776193e15641f84fcc1e5980c9 , < d2bd51954ac8377c2f1eb1813e694788998add66 (git)
Affected: a11dd49dcb9376776193e15641f84fcc1e5980c9 , < f754f27e98f88428aaf6be6e00f5cbce97f62d4b (git)
Affected: 8af1c121b0102041809bc137ec600d1865eaeedd (git)
Affected: 5941a90c55d3bfba732b32208d58d997600b44ef (git)
Affected: 2a1728c15ec4f45ed9248ae22f626541c179bfbe (git)
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    Linux Linux Affected: 6.8
Unaffected: 0 , < 6.8 (semver)
Unaffected: 6.1.140 , ≤ 6.1.* (semver)
Unaffected: 6.6.72 , ≤ 6.6.* (semver)
Unaffected: 6.12.10 , ≤ 6.12.* (semver)
Unaffected: 6.13 , ≤ * (original_commit_for_fix)
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