1 // SPDX-License-Identifier: CDDL-1.0 2 /* 3 * CDDL HEADER START 4 * 5 * The contents of this file are subject to the terms of the 6 * Common Development and Distribution License (the "License"). 7 * You may not use this file except in compliance with the License. 8 * 9 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 10 * or https://opensource.org/licenses/CDDL-1.0. 11 * See the License for the specific language governing permissions 12 * and limitations under the License. 13 * 14 * When distributing Covered Code, include this CDDL HEADER in each 15 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 16 * If applicable, add the following below this CDDL HEADER, with the 17 * fields enclosed by brackets "[]" replaced with your own identifying 18 * information: Portions Copyright [yyyy] [name of copyright owner] 19 * 20 * CDDL HEADER END 21 */ 22 23 /* 24 * Copyright (c) 2025, Rob Norris <robn@despairlabs.com> 25 */ 26 27 #ifndef _ZFS_LINUX_KASAN_ENABLED_H 28 #define _ZFS_LINUX_KASAN_ENABLED_H 29 30 #ifdef HAVE_KASAN_ENABLED_GPL_ONLY 31 /* 32 * The kernel supports a runtime setting to enable/disable KASAN. The control 33 * flag kasan_flag_enabled is a GPL-only symbol, which prevents us from 34 * accessing it. Unfortunately, this is called by the header function 35 * kasan_enabled(), which in turn is used to call or skip instrumentation 36 * functions in various header-based kernel facilities. If we inadvertently 37 * call one, the build breaks. 38 * 39 * To work around this, we define our own `kasan_flag_enabled` set to "false", 40 * disabling use of KASAN inside our code. The linker will resolve this symbol 41 * at build time, and so never need to reach out to the off-limits kernel 42 * symbol. 43 */ 44 #include <linux/static_key.h> 45 struct static_key_false kasan_flag_enabled = STATIC_KEY_FALSE_INIT; 46 #endif 47 48 #endif 49