Created
October 7, 2024 05:39
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corrupted buffer index mgag200
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| #include <stdio.h> | |
| #include <stdlib.h> | |
| #include <string.h> | |
| #include <errno.h> | |
| // Dummy structures to represent kernel structures | |
| struct device { | |
| // Simplified device structure | |
| int dummy; | |
| }; | |
| struct drm_driver { | |
| // Simplified drm_driver structure | |
| int dummy; | |
| }; | |
| struct drm_device { | |
| // Simplified drm_device structure | |
| struct device *dev; | |
| const struct drm_driver *driver; | |
| }; | |
| // Error pointer macro | |
| #define ERR_PTR(error) ((void *)(long)(error)) | |
| #define IS_ERR(ptr) ((unsigned long)(ptr) > (unsigned long)(-1000)) | |
| #define PTR_ERR(ptr) ((long)(ptr)) | |
| // Dummy functions to simulate kernel functions | |
| void *kzalloc(size_t size, int flags) { | |
| void *ptr = calloc(1, size); | |
| return ptr; | |
| } | |
| int devm_drm_dev_init(struct device *parent, struct drm_device *drm, const struct drm_driver *driver) { | |
| // Dummy implementation | |
| drm->dev = parent; | |
| drm->driver = driver; | |
| return 0; // Assume success | |
| } | |
| void drmm_add_final_kfree(struct drm_device *drm, void *container) { | |
| // Dummy implementation | |
| // In a real implementation, this would set up the container to be freed when the drm device is destroyed | |
| } | |
| // Main function | |
| void *__devm_drm_dev_alloc(struct device *parent, | |
| const struct drm_driver *driver, | |
| size_t size, size_t offset) | |
| { | |
| void *container; | |
| struct drm_device *drm; | |
| int ret; | |
| container = kzalloc(size, 0); // GFP_KERNEL flag is not needed in userspace | |
| if (!container) | |
| return ERR_PTR(-ENOMEM); | |
| drm = (struct drm_device *)((char *)container + offset); | |
| ret = devm_drm_dev_init(parent, drm, driver); | |
| if (ret) { | |
| free(container); | |
| return ERR_PTR(ret); | |
| } | |
| drmm_add_final_kfree(drm, container); | |
| return container; | |
| } | |
| // Test function | |
| int main() { | |
| struct device parent = {0}; | |
| struct drm_driver driver = {0}; | |
| size_t size = sizeof(struct drm_device) + 64; // 64 bytes extra for example | |
| size_t offset = 64; // Offset to drm_device | |
| void *result = __devm_drm_dev_alloc(&parent, &driver, size, offset); | |
| if (IS_ERR(result)) { | |
| printf("Error allocating DRM device: %ld\n", PTR_ERR(result)); | |
| } else { | |
| printf("DRM device allocated successfully at %p\n", result); | |
| struct drm_device *drm = (struct drm_device *)((char *)result + offset); | |
| printf("DRM device structure at %p\n", (void *)drm); | |
| free(result); // In real usage, this would be handled by the DRM subsystem | |
| } | |
| return 0; | |
| } |
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