FreeBSD/Linux Kernel Cross Reference
sys/amd64/include/asan.h

     /*-
      * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
      *
      * Copyright (c) 2020 The FreeBSD Foundation
      *
      * This software was developed by Mark Johnston under sponsorship from the
      * FreeBSD Foundation.
      *
      * Redistribution and use in source and binary forms, with or without
     * modification, are permitted provided that the following conditions are
     * met:
     * 1. Redistributions of source code must retain the above copyright
     *    notice, this list of conditions and the following disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in
     *    the documentation and/or other materials provided with the distribution.
     *
     * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
     * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
     * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     * SUCH DAMAGE.
     */
    
    #ifndef _MACHINE_ASAN_H_
    #define _MACHINE_ASAN_H_
    
    #ifdef KASAN
    
    #include <vm/vm.h>
    #include <vm/pmap.h>
    #include <vm/vm_page.h>
    #include <machine/vmparam.h>
    
    static inline vm_offset_t
    kasan_md_addr_to_shad(vm_offset_t addr)
    {
            return (((addr - VM_MIN_KERNEL_ADDRESS) >> KASAN_SHADOW_SCALE_SHIFT) +
                KASAN_MIN_ADDRESS);
    }
    
    static inline bool
    kasan_md_unsupported(vm_offset_t addr)
    {
            vm_offset_t kernmin;
    
            /*
             * The vm_page array is mapped at the beginning of the kernel map, but
             * accesses to the array are not validated for now.  Handle the fact
             * that KASAN must validate accesses before the vm_page array is
             * initialized.
             */
            kernmin = vm_page_array == NULL ? VM_MIN_KERNEL_ADDRESS :
                (vm_offset_t)(vm_page_array + vm_page_array_size);
            return (addr < kernmin || addr >= VM_MAX_KERNEL_ADDRESS);
    }
    
    static inline void
    kasan_md_init(void)
    {
    }
    
    static inline void
    kasan_md_init_early(vm_offset_t bootstack, size_t size)
    {
            kasan_shadow_map(bootstack, size);
    }
    
    #endif /* KASAN */
    
    #endif /* !_MACHINE_ASAN_H_ */

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