kernel/kcsan/core.c

394 	return ctx->disable_scoped ? NULL : &ctx->reorder_access;
404 	struct kcsan_scoped_access *reorder_access = get_reorder_access(ctx);
406 	if (!reorder_access)
410 	 * Note: If accesses are repeated while reorder_access is identical,
413 	return reorder_access->ptr == ptr && reorder_access->size == size &&
414 	       reorder_access->type == type && reorder_access->ip == ip;
421 	struct kcsan_scoped_access *reorder_access = get_reorder_access(ctx);
423 	if (!reorder_access || !kcsan_weak_memory)
428 	 * reading an inconsistent reorder_access, ensure that the below has
429 	 * exclusive access to reorder_access by disallowing concurrent use.
433 	reorder_access->ptr		= ptr;
434 	reorder_access->size		= size;
435 	reorder_access->type		= type | KCSAN_ACCESS_SCOPED;
436 	reorder_access->ip		= ip;
437 	reorder_access->stack_depth	= get_kcsan_stack_depth();
481 	 * reorder_access is never created from an access with access_mask set.
567 	 *	   the current access is reorder_access, disable interrupts.
758 			struct kcsan_scoped_access *reorder_access = get_reorder_access(ctx);
760 			if (reorder_access) {
762 				 * reorder_access check: simulates reordering of
765 				ptr = reorder_access->ptr;
766 				type = reorder_access->type;
767 				ip = reorder_access->ip;
770 				 * reorder_access can be modified (shared ctx).
771 				 * We know that upon return, reorder_access is
777 				size = READ_ONCE(reorder_access->size);
785 		 * if reorder_access is valid, checked after it was checked.
1090  * Function entry and exit are used to determine the validty of reorder_access.
1113 	struct kcsan_scoped_access *reorder_access;
1118 	reorder_access = get_reorder_access(get_ctx());
1119 	if (!reorder_access)
1122 	if (get_kcsan_stack_depth() <= reorder_access->stack_depth) {
1130 		check_access(reorder_access->ptr, reorder_access->size,
1131 			     reorder_access->type, reorder_access->ip);
1132 		reorder_access->size = 0;
1133 		reorder_access->stack_depth = INT_MIN;