Description (CNA)
In the Linux kernel, the following vulnerability has been resolved: kho: fix size calculation in kho_preserved_memory_reserve() kho_preserved_memory_reserve() calculates the size of a preservation by doing 1 << (order + PAGE_SHIFT). Since the '1' is a 32-bit integer, it can only be shifted by 31. That is, it will only work for preservations up to 2 GiB. Larger preservations will trigger undefined behaviour. While preservations larger than 2 GiB can't be obtained via folios currently, they can be obtained via kho_preserve_pages(). For example, memblock reserve_mem uses kho_preserve_pages(). Reservations larger than 2 GiB are valid and will trigger this bug if properly aligned. Fix it by using 1UL for shifting.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected fc33e4b44b2717feba2f6f07ce7943a96499c9ec before 0692a8fdf0222af130c8ea97426f1c3bf3814905; affected fc33e4b44b2717feba2f6f07ce7943a96499c9ec before 42a6f03cf352eb6e6dbeef95e75e686f4cdb9bd1; affected fc33e4b44b2717feba2f6f07ce7943a96499c9ec before 3a0b8fa2eb36afc88b62a95f33f0c77c71fa5ded |
| Linux / Linux | affected 6.16; unaffected 0 before 6.16; unaffected 6.18.57 through 6.18.*; unaffected 7.2.4 through 7.2.*; unaffected 7.3 through * |
CWE
No CWE identifiers supplied.