CVE-2024-44965: x86/mm: Fix pti_clone_pgtable() alignment assumption
First published: Wed Sep 04 2024(Updated: )
In the Linux kernel, the following vulnerability has been resolved: x86/mm: Fix pti_clone_pgtable() alignment assumption Guenter reported dodgy crashes on an i386-nosmp build using GCC-11 that had the form of endless traps until entry stack exhaust and then #DF from the stack guard. It turned out that pti_clone_pgtable() had alignment assumptions on the start address, notably it hard assumes start is PMD aligned. This is true on x86_64, but very much not true on i386. These assumptions can cause the end condition to malfunction, leading to a 'short' clone. Guess what happens when the user mapping has a short copy of the entry text? Use the correct increment form for addr to avoid alignment assumptions.
Credit: 416baaa9-dc9f-4396-8d5f-8c081fb06d67 416baaa9-dc9f-4396-8d5f-8c081fb06d67
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Linux Linux kernel | >=4.19<4.19.320 | |
| Linux Linux kernel | >=4.20<5.4.282 | |
| Linux Linux kernel | >=5.5<5.10.224 | |
| Linux Linux kernel | >=5.11<5.15.165 | |
| Linux Linux kernel | >=5.16<6.1.105 | |
| Linux Linux kernel | >=6.2<6.6.46 | |
| Linux Linux kernel | >=6.7<6.10.5 | |
| Linux Linux kernel | =6.11-rc1 | |
| debian/linux | <=5.10.223-1 | 5.10.226-1 6.1.115-1 6.1.112-1 6.11.7-1 |
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Reference Links
- https://git.kernel.org/stable/c/18da1b27ce16a14a9b636af9232acb4fb24f4c9e
- https://git.kernel.org/stable/c/25a727233a40a9b33370eec9f0cad67d8fd312f8
- https://git.kernel.org/stable/c/41e71dbb0e0a0fe214545fe64af031303a08524c
- https://git.kernel.org/stable/c/4d143ae782009b43b4f366402e5c37f59d4e4346
- https://git.kernel.org/stable/c/5c580c1050bcbc15c3e78090859d798dcf8c9763
- https://git.kernel.org/stable/c/ca07aab70dd3b5e7fddb62d7a6ecd7a7d6d0b2ed
- https://git.kernel.org/stable/c/d00c9b4bbc442d99e1dafbdfdab848bc1ead73f6
- https://git.kernel.org/stable/c/df3eecb5496f87263d171b254ca6e2758ab3c35c
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2024-44965
- https://nvd.nist.gov/vuln/detail/CVE-2024-44965
- https://launchpad.net/bugs/cve/CVE-2024-44965
- https://security-tracker.debian.org/tracker/CVE-2024-44965
- https://ubuntu.com/security/CVE-2024-44965
- https://git.kernel.org/linus/41e71dbb0e0a0fe214545fe64af031303a08524c
- https://lore.kernel.org/linux-cve-announce/2024090415-CVE-2024-44965-d41d@gregkh/T
- https://access.redhat.com/errata/RHSA-2024:9315
- https://bugzilla.redhat.com/show_bug.cgi?id=2309796
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