CVE-2025-29934: AMD CPU SEV-SNP stale TLB条目导致数据完整性丧失漏洞

// CVE-2025-29934 PoC概念验证（概念性代码） // 注意：实际硬件漏洞利用需要特殊环境 #include <stdio.h> #include <stdlib.h> #include <stdint.h> // Simulated TLB entry structure typedef struct { uint64_t virtual_address; uint64_t physical_address; uint64_t flags; int valid; } tlb_entry_t; // Global TLB simulation tlb_entry_t tlb_cache[16]; // Function to simulate stale TLB entry exploitation int trigger_stale_tlb_exploit(void) { printf("[*] Initiating CVE-2025-29934 simulation...\n"); // Step 1: Initialize TLB with entries printf("[*] Step 1: Setting up initial TLB state...\n"); for (int i = 0; i < 4; i++) { tlb_cache[i].virtual_address = 0x1000 + (i * 0x1000); tlb_cache[i].physical_address = 0x400000 + (i * 0x1000); tlb_cache[i].valid = 1; } // Step 2: Simulate page table update without TLB flush printf("[*] Step 2: Simulating page table update (no flush)...\n"); // In real scenario, this would trigger SNP page state change tlb_cache[0].physical_address = 0x500000; // Updated mapping // Step 3: Trigger context switch printf("[*] Step 3: Triggering VM context switch...\n"); // Step 4: Access through potentially stale TLB entry printf("[*] Step 4: Attempting to access memory via stale entry...\n"); uint64_t vaddr = tlb_cache[0].virtual_address; uint64_t paddr = tlb_cache[0].physical_address; printf("[!] Virtual Address: 0x%lx -> Physical Address: 0x%lx\n", vaddr, paddr); // Step 5: Verify data integrity impact printf("[*] Step 5: Checking for data integrity violation...\n"); printf("[!] Potential integrity issue: accessing old mapping\n"); return 0; } int main(int argc, char *argv[]) { printf("========================================\n"); printf("CVE-2025-29934 PoC Simulation\n"); printf("AMD SEV-SNP Stale TLB Entry Vulnerability\n"); printf("========================================\n\n"); if (geteuid() != 0) { printf("[!] Warning: This exploit requires root/admin privileges\n"); printf("[!] Continuing in simulation mode...\n\n"); } trigger_stale_tlb_exploit(); printf("\n[*] Simulation complete.\n"); printf("[*] Note: This is a conceptual demonstration.\n"); printf("[*] Actual exploitation requires AMD SEV-SNP hardware.\n"); return 0; }