Description (CNA)
In the Linux kernel, the following vulnerability has been resolved: LoongArch: BPF: Move arena register slot below TCC context Currently, the stack layout places the optional arena register slot above the tail call counter context. When arena_vm_start is dynamically enabled, it shifts the relative offset of the tcc_ptr slot within the stack frame, causing hardcoded tracking macros to mismatch and leading to memory misalignment or corruption potentially. To fix this, move the arena register save and restore sequences below the tail call counter context slots in both build_prologue() and the epilogue. Update __build_epilogue() to insert a proper offset decrement to safely skip the unneeded tcc_ptr reading block while accurately aligning with the relocated arena slot at the very bottom. With this patch, the tcc_ptr slot is always positioned at a fixed distance directly underneath the base callee-saved registers that is independent of whether the arena features are on.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected ef54c517a9376b188da06b5e1ed556129c4280be before f0e4d069cb47cf4f8dc4f6bc104e0671155aa3b9; affected ef54c517a9376b188da06b5e1ed556129c4280be before cd7e356b07a27e91394838cf3fb655862b519294 |
| Linux / Linux | affected 7.0; unaffected 0 before 7.0; unaffected 7.2.5 through 7.2.*; unaffected 7.3 through * |
CWE
No CWE identifiers supplied.