In the Linux kernel, the following vulnerability has been resolved: LoongArch: Set correct protectionmap[] for VMNONE/VMSHARED For 32BIT platform _PAGEPROTNONE is 0, so set a VMA to be VMNONE or VMSHARED will make pages non-present, then cause Oops with kernel page fault. Fix it by set correct protectionmap[] for VMNONE/VMSHARED, replacing _PAGEPROTNONE with PAGEPRESENT.