44 	/* Page index for the beginning of the shadow */
46 	/* An array of __cfi_check locations (as indices to the shadow) */
47 	shadow_t shadow[1];  member
51  * The shadow covers ~128M from the beginning of the module region. If
61 /* The actual size of the shadow array, minus metadata */
62 #define SHADOW_ARR_SIZE		(SHADOW_SIZE - offsetof(struct cfi_shadow, shadow))
68 /* Returns the index in the shadow for the given address */
80 		return -1; /* Cannot be addressed with shadow */  in ptr_to_shadow()
85 /* Returns the page address for an index in the shadow */
95 /* Returns the __cfi_check function address for the given shadow location */
102 	if (unlikely(s->shadow[index] == SHADOW_INVALID))  in shadow_to_check_fn()
106 	return (s->base + s->shadow[index]) << PAGE_SHIFT;  in shadow_to_check_fn()
115 	memset(next->shadow, 0xFF, SHADOW_ARR_SIZE);  in prepare_next_shadow()
118 		return; /* No previous shadow */  in prepare_next_shadow()
122 		memcpy(next->shadow, prev->shadow, SHADOW_ARR_SIZE);  in prepare_next_shadow()
126 	/* Convert the previous shadow to the new address range */  in prepare_next_shadow()
128 		if (prev->shadow[i] == SHADOW_INVALID)  in prepare_next_shadow()
136 				shadow_to_check_fn(prev, prev->shadow[i]));  in prepare_next_shadow()
140 		next->shadow[index] = (shadow_t)check;  in prepare_next_shadow()
152 		pr_warn("cfi: not using shadow for module %s\n", mod->name);  in add_module_to_shadow()
158 		return; /* Module not addressable with shadow */  in add_module_to_shadow()
160 	/* For each page, store the check function index in the shadow */  in add_module_to_shadow()
166 			WARN_ON_ONCE(s->shadow[index] != SHADOW_INVALID);  in add_module_to_shadow()
167 			s->shadow[index] = (shadow_t)check_index;  in add_module_to_shadow()
181 			s->shadow[index] = SHADOW_INVALID;  in remove_module_from_shadow()
238 		return NULL; /* No shadow available */  in ptr_to_check_fn()
242 		return NULL; /* Cannot be addressed with shadow */  in ptr_to_check_fn()
290 	 * the shadow and __module_address use RCU, so we need to wake it  in find_check_fn()