mirror of
https://git.hardenedbsd.org/hardenedbsd/HardenedBSD.git
synced 2024-11-23 03:41:07 +01:00
90010126b0
This is mostly a copy of amd64's msan.h, except that we currently do not avoid shadowing the kernel itself, and we need a more restrictive upper bound in kmsan_md_unsupported() to avoid probing non-existent shadow mappings of device mappings. Reviewed by: imp MFC after: 2 weeks Sponsored by: Klara, Inc. Sponsored by: Juniper Networks, Inc. Differential Revision: https://reviews.freebsd.org/D43156
92 lines
2.9 KiB
C
92 lines
2.9 KiB
C
/*-
|
|
* SPDX-License-Identifier: BSD-2-Clause
|
|
*
|
|
* Copyright (c) 2021 The FreeBSD Foundation
|
|
* Copyright (c) 2023 Juniper Networks, Inc.
|
|
*
|
|
* 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_MSAN_H_
|
|
#define _MACHINE_MSAN_H_
|
|
|
|
#ifdef KMSAN
|
|
|
|
#include <vm/vm.h>
|
|
#include <vm/pmap.h>
|
|
#include <vm/vm_page.h>
|
|
#include <machine/vmparam.h>
|
|
|
|
typedef uint32_t msan_orig_t;
|
|
|
|
/*
|
|
* Our 32-bit origin cells encode a 2-bit type and 30-bit pointer to a kernel
|
|
* instruction. The pointer is compressed by making it a positive offset
|
|
* relative to KERNBASE.
|
|
*/
|
|
#define KMSAN_ORIG_TYPE_SHIFT 30u
|
|
#define KMSAN_ORIG_PTR_MASK ((1ul << KMSAN_ORIG_TYPE_SHIFT) - 1)
|
|
|
|
static inline msan_orig_t
|
|
kmsan_md_orig_encode(int type, uintptr_t ptr)
|
|
{
|
|
return ((type << KMSAN_ORIG_TYPE_SHIFT) |
|
|
((ptr & KMSAN_ORIG_PTR_MASK)));
|
|
}
|
|
|
|
static inline void
|
|
kmsan_md_orig_decode(msan_orig_t orig, int *type, uintptr_t *ptr)
|
|
{
|
|
*type = orig >> KMSAN_ORIG_TYPE_SHIFT;
|
|
*ptr = (orig & KMSAN_ORIG_PTR_MASK) | KERNBASE;
|
|
}
|
|
|
|
static inline vm_offset_t
|
|
kmsan_md_addr_to_shad(vm_offset_t addr)
|
|
{
|
|
return (addr - VM_MIN_KERNEL_ADDRESS + KMSAN_SHAD_MIN_ADDRESS);
|
|
}
|
|
|
|
static inline vm_offset_t
|
|
kmsan_md_addr_to_orig(vm_offset_t addr)
|
|
{
|
|
return (addr - VM_MIN_KERNEL_ADDRESS + KMSAN_ORIG_MIN_ADDRESS);
|
|
}
|
|
|
|
static inline bool
|
|
kmsan_md_unsupported(vm_offset_t addr)
|
|
{
|
|
/*
|
|
* It would be cheaper to use VM_MAX_KERNEL_ADDRESS as the upper bound,
|
|
* but we need to exclude device mappings above kernel_vm_end but within
|
|
* the kernel map.
|
|
*/
|
|
return (addr < VM_MIN_KERNEL_ADDRESS || addr >= kernel_vm_end);
|
|
}
|
|
|
|
#endif /* KMSAN */
|
|
|
|
#endif /* !_MACHINE_MSAN_H_ */
|