CVE-2024-40948: mm/page_table_check: fix crash on ZONE_DEVICE
First published: Fri Jul 12 2024(Updated: )
In the Linux kernel, the following vulnerability has been resolved: mm/page_table_check: fix crash on ZONE_DEVICE Not all pages may apply to pgtable check. One example is ZONE_DEVICE pages: they map PFNs directly, and they don't allocate page_ext at all even if there's struct page around. One may reference devm_memremap_pages(). When both ZONE_DEVICE and page-table-check enabled, then try to map some dax memories, one can trigger kernel bug constantly now when the kernel was trying to inject some pfn maps on the dax device: kernel BUG at mm/page_table_check.c:55! While it's pretty legal to use set_pxx_at() for ZONE_DEVICE pages for page fault resolutions, skip all the checks if page_ext doesn't even exist in pgtable checker, which applies to ZONE_DEVICE but maybe more.
Credit: 416baaa9-dc9f-4396-8d5f-8c081fb06d67 416baaa9-dc9f-4396-8d5f-8c081fb06d67
| Affected Software | Affected Version | How to fix |
|---|---|---|
| redhat/kernel | <6.1.96 | 6.1.96 |
| redhat/kernel | <6.6.36 | 6.6.36 |
| redhat/kernel | <6.9.7 | 6.9.7 |
| redhat/kernel | <6.10 | 6.10 |
| debian/linux | 5.10.223-1 5.10.226-1 6.1.115-1 6.1.119-1 6.11.10-1 6.12.5-1 |
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Reference Links
- https://git.kernel.org/stable/c/51897f99351fff7b57f4f141940fa93b4e90fd2b
- https://git.kernel.org/stable/c/84d3549d54f5ff9fa3281257be3019386f51d1a0
- https://git.kernel.org/stable/c/8bb592c2eca8fd2bc06db7d80b38da18da4a2f43
- https://git.kernel.org/stable/c/dec2382247860d2134c8d41e103e26460c099629
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2024-40948
- https://nvd.nist.gov/vuln/detail/CVE-2024-40948
- https://launchpad.net/bugs/cve/CVE-2024-40948
- https://security-tracker.debian.org/tracker/CVE-2024-40948
- https://ubuntu.com/security/CVE-2024-40948
- https://git.kernel.org/linus/8bb592c2eca8fd2bc06db7d80b38da18da4a2f43
- https://access.redhat.com/errata/RHSA-2024:9315
- https://bugzilla.redhat.com/show_bug.cgi?id=2297532
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