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CVE-2024-44965 In the Linux kernel, the following vulnerability has been resolved: x86/mm: Fix pti_clone_pgtable() alignment assumption…
Description
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.
Affected products and versions
| Product | Affected versions | Fixed in |
|---|---|---|
| Linux 6.11 | earliest → < 6.11 | 6.11 |
| Linux 6.10 | earliest → < 6.10.5 | 6.10.5 |
| Linux 6.6 | earliest → < 6.6.46 | 6.6.46 |
| Linux 6.1 | earliest → < 6.1.105 | 6.1.105 |
| Linux 5.15 | earliest → < 5.15.165 | 5.15.165 |
| Linux 5.10 | earliest → < 5.10.224 | 5.10.224 |
| Linux 5.4 | earliest → < 5.4.282 | 5.4.282 |
| Linux | 4.19 | 4.19.320 |
| SIMATIC S7-1500 CPU 1518-4 PN/DP MFP 3.1 | 3.1.0 → < 3.1.5 | 3.1.5 |
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| Product | Affected versions | Fixed in |
|---|---|---|
| SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP 3.1 | 3.1.0 → < 3.1.5 | 3.1.5 |
| SIPLUS S7-1500 CPU 1518-4 PN/DP MFP 3.1 | 3.1.0 → < 3.1.5 | 3.1.5 |
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