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c9845a1332
We may not be able to avoid our code referencing the symbol, but we can ensure that a symbol of that name is available to the linker during build, and so not require linking the GPL-exported version. Sponsored-by: https://despairlabs.com/sponsor/ Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Rob Norris <robn@despairlabs.com> Closes #18009 Closes #18040
49 lines
1.8 KiB
C
49 lines
1.8 KiB
C
// SPDX-License-Identifier: CDDL-1.0
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/*
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* CDDL HEADER START
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*
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* The contents of this file are subject to the terms of the
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* Common Development and Distribution License (the "License").
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* You may not use this file except in compliance with the License.
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*
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* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
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* or https://opensource.org/licenses/CDDL-1.0.
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* See the License for the specific language governing permissions
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* and limitations under the License.
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*
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* When distributing Covered Code, include this CDDL HEADER in each
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* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
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* If applicable, add the following below this CDDL HEADER, with the
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* fields enclosed by brackets "[]" replaced with your own identifying
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* information: Portions Copyright [yyyy] [name of copyright owner]
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*
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* CDDL HEADER END
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*/
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/*
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* Copyright (c) 2025, Rob Norris <robn@despairlabs.com>
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*/
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#ifndef _ZFS_LINUX_KASAN_ENABLED_H
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#define _ZFS_LINUX_KASAN_ENABLED_H
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#ifdef HAVE_KASAN_ENABLED_GPL_ONLY
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/*
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* The kernel supports a runtime setting to enable/disable KASAN. The control
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* flag kasan_flag_enabled is a GPL-only symbol, which prevents us from
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* accessing it. Unfortunately, this is called by the header function
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* kasan_enabled(), which in turn is used to call or skip instrumentation
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* functions in various header-based kernel facilities. If we inadvertently
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* call one, the build breaks.
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*
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* To work around this, we define our own `kasan_flag_enabled` set to "false",
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* disabling use of KASAN inside our code. The linker will resolve this symbol
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* at build time, and so never need to reach out to the off-limits kernel
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* symbol.
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*/
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#include <linux/static_key.h>
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struct static_key_false kasan_flag_enabled = STATIC_KEY_FALSE_INIT;
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#endif
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#endif
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