CVE-2024-42293 (GCVE-0-2024-42293)
Vulnerability from cvelistv5
Published
2024-08-17 09:09
Modified
2025-05-04 09:26
Severity ?
Summary
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.
References
Impacted products
Vendor Product Version
Linux Linux Version: 0dd4f60a2c76938c2625f6c630c225699d97608b
Version: 0dd4f60a2c76938c2625f6c630c225699d97608b
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