include/linux/kfence.h

38  * object range.
44  * an object requires specific handling.
91  * which include stack traces to the user of the object, the original allocation
97  * Allocate a KFENCE object. Allocators must not call this function directly,
103  * kfence_alloc() - allocate a KFENCE object with a low probability
104  * @s:     struct kmem_cache with object requirements
105  * @size:  exact size of the object to allocate (can be less than @s->size
111  * * non-NULL - pointer to a KFENCE object.
133  * kfence_ksize() - get actual amount of memory allocated for a KFENCE object
134  * @addr: pointer to a heap object
137  * * 0     - not a KFENCE object, must call __ksize() instead,
140  * kfence_ksize() returns the number of bytes requested for a KFENCE object at
141  * allocation time. This number may be less than the object size of the
147  * kfence_object_start() - find the beginning of a KFENCE object
148  * @addr: address within a KFENCE-allocated object
150  * Return: address of the beginning of the object.
153  * easy to calculate the beginning of an object given a pointer inside it and
154  * the object size. The same is not true for KFENCE, which places a single
155  * object at either end of the page. This helper function is used to find the
156  * beginning of a KFENCE-allocated object.
161  * __kfence_free() - release a KFENCE heap object to KFENCE pool
162  * @addr: object to be freed
166  * Release a KFENCE object and mark it as freed.
171  * kfence_free() - try to release an arbitrary heap object to KFENCE pool
172  * @addr: object to be freed
175  * * false - object doesn't belong to KFENCE pool and was ignored,
176  * * true  - object was released to KFENCE pool.
178  * Release a KFENCE object and mark it as freed. May be called on any object,
181  * determine if it was a KFENCE object or not.
213  * @object: the object
216  * * false - not a KFENCE object
217  * * true - a KFENCE object, filled @kpp
221 bool __kfence_obj_info(struct kmem_obj_info *kpp, void *object, struct slab *slab);
245 static inline bool __kfence_obj_info(struct kmem_obj_info *kpp, void *object, struct slab *slab)  in __kfence_obj_info()  argument