Description (CNA)
In the Linux kernel, the following vulnerability has been resolved: arm64: mm: Fix lockless walks with static and dynamic page-table folding Lina reports random oopsen originating from the fast GUP code when 16K pages are used with 4-level page-tables, the fourth level being folded at runtime due to lack of LPA2. In this configuration, the generic implementation of p4d_offset_lockless() will return a 'p4d_t *' corresponding to the 'pgd_t' allocated on the stack of the caller, gup_fast_pgd_range(). This is normally fine, but when the fourth level of page-table is folded at runtime, pud_offset_lockless() will offset from the address of the 'p4d_t' to calculate the address of the PUD in the same page-table page. This results in a stray stack read when the 'p4d_t' has been allocated on the stack and can send the walker into the weeds. Fix the problem by providing our own definition of p4d_offset_lockless() when CONFIG_PGTABLE_LEVELS <= 4 which returns the real page-table pointer rather than the address of the local stack variable.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected 0dd4f60a2c76938c2625f6c630c225699d97608b before 78672d49d3eebbcda3589f4d6e589caf357c5a59; affected 0dd4f60a2c76938c2625f6c630c225699d97608b before 36639013b3462c06ff8e3400a427f775b4fc97f5 |
| Linux / Linux | affected 6.9; unaffected 0 before 6.9; unaffected 6.10.3 through 6.10.*; unaffected 6.11 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/78672d49d3eebbcda3589f4d6e589caf357c5a59
- https://git.kernel.org/stable/c/36639013b3462c06ff8e3400a427f775b4fc97f5
ADP enrichment
No English description supplied.
No references supplied.