1*546d3d08SMartin Matuska // SPDX-License-Identifier: CDDL-1.0 2*546d3d08SMartin Matuska /* 3*546d3d08SMartin Matuska * CDDL HEADER START 4*546d3d08SMartin Matuska * 5*546d3d08SMartin Matuska * The contents of this file are subject to the terms of the 6*546d3d08SMartin Matuska * Common Development and Distribution License (the "License"). 7*546d3d08SMartin Matuska * You may not use this file except in compliance with the License. 8*546d3d08SMartin Matuska * 9*546d3d08SMartin Matuska * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 10*546d3d08SMartin Matuska * or https://opensource.org/licenses/CDDL-1.0. 11*546d3d08SMartin Matuska * See the License for the specific language governing permissions 12*546d3d08SMartin Matuska * and limitations under the License. 13*546d3d08SMartin Matuska * 14*546d3d08SMartin Matuska * When distributing Covered Code, include this CDDL HEADER in each 15*546d3d08SMartin Matuska * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 16*546d3d08SMartin Matuska * If applicable, add the following below this CDDL HEADER, with the 17*546d3d08SMartin Matuska * fields enclosed by brackets "[]" replaced with your own identifying 18*546d3d08SMartin Matuska * information: Portions Copyright [yyyy] [name of copyright owner] 19*546d3d08SMartin Matuska * 20*546d3d08SMartin Matuska * CDDL HEADER END 21*546d3d08SMartin Matuska */ 22*546d3d08SMartin Matuska 23*546d3d08SMartin Matuska /* 24*546d3d08SMartin Matuska * Copyright (c) 2025, Rob Norris <robn@despairlabs.com> 25*546d3d08SMartin Matuska */ 26*546d3d08SMartin Matuska 27*546d3d08SMartin Matuska #ifndef _ZFS_LINUX_KASAN_ENABLED_H 28*546d3d08SMartin Matuska #define _ZFS_LINUX_KASAN_ENABLED_H 29*546d3d08SMartin Matuska 30*546d3d08SMartin Matuska #ifdef HAVE_KASAN_ENABLED_GPL_ONLY 31*546d3d08SMartin Matuska /* 32*546d3d08SMartin Matuska * The kernel supports a runtime setting to enable/disable KASAN. The control 33*546d3d08SMartin Matuska * flag kasan_flag_enabled is a GPL-only symbol, which prevents us from 34*546d3d08SMartin Matuska * accessing it. Unfortunately, this is called by the header function 35*546d3d08SMartin Matuska * kasan_enabled(), which in turn is used to call or skip instrumentation 36*546d3d08SMartin Matuska * functions in various header-based kernel facilities. If we inadvertently 37*546d3d08SMartin Matuska * call one, the build breaks. 38*546d3d08SMartin Matuska * 39*546d3d08SMartin Matuska * To work around this, we define our own `kasan_flag_enabled` set to "false", 40*546d3d08SMartin Matuska * disabling use of KASAN inside our code. The linker will resolve this symbol 41*546d3d08SMartin Matuska * at build time, and so never need to reach out to the off-limits kernel 42*546d3d08SMartin Matuska * symbol. 43*546d3d08SMartin Matuska */ 44*546d3d08SMartin Matuska #include <linux/static_key.h> 45*546d3d08SMartin Matuska struct static_key_false kasan_flag_enabled = STATIC_KEY_FALSE_INIT; 46*546d3d08SMartin Matuska #endif 47*546d3d08SMartin Matuska 48*546d3d08SMartin Matuska #endif 49