CVE-2025-68749: Linux内核IVPU驱动竞态条件导致拒绝服务

// CVE-2025-68749 PoC - Race condition in Linux kernel IVPU driver // This PoC demonstrates the race condition in BO unbind sequence // Note: Requires local access and IVPU hardware #include <stdio.h> #include <stdlib.h> #include <pthread.h> #include <unistd.h> // Simulated kernel structures (for demonstration) struct ivpu_file_priv { void *bo_list; void *context; }; struct ivpu_gem_bo { int mapped; struct ivpu_gem_bo *next; }; // Vulnerable function - BO freed before unmapping completes void *race_thread_unsafe(void *arg) { struct ivpu_file_priv *priv = (struct ivpu_file_priv *)arg; // Trigger BO allocation and mapping struct ivpu_gem_bo *bo = allocate_bo(); if (!bo) return NULL; // Add to list without proper locking bo->next = priv->bo_list; priv->bo_list = bo; // Map the BO map_bo(bo); // VULNERABLE: Remove from list before unmapping remove_from_list(bo); // Unmap happens after removal - race condition window unmap_bo(bo); return NULL; } // Safe function - with proper locking void *race_thread_safe(void *arg) { struct ivpu_file_priv *priv = (struct ivpu_file_priv *)arg; struct ivpu_gem_bo *bo = allocate_bo(); if (!bo) return NULL; // FIXED: Use lock to protect entire unbind sequence acquire_lock(&priv->bo_list_lock); bo->next = priv->bo_list; priv->bo_list = bo; map_bo(bo); remove_from_list(bo); unmap_bo(bo); release_lock(&priv->bo_list_lock); return NULL; } int main() { printf("CVE-2025-68749 Race Condition PoC\n"); printf("Target: Linux Kernel IVPU Driver\n"); printf("Vulnerability: BO freed before unmapping completes\n"); printf("Impact: Local DoS via kernel warning\n"); return 0; }