693c9516fa
Sanitizer instrumentation of course cannot automatically update shadow state when devices write to host memory. KMSAN thus hooks into busdma, both to update shadow state after a device write, and to verify that the kernel does not publish uninitalized bytes to devices. To implement this, when KMSAN is configured, each dmamap embeds a memory descriptor describing the region currently loaded into the map. bus_dmamap_sync() uses the operation flags to determine whether to validate the loaded region or to mark it as initialized in the shadow map. Note that in cases where the amount of data written is less than the buffer size, the entire buffer is marked initialized even when it is not. For example, if a NIC writes a 128B packet into a 2KB buffer, the entire buffer will be marked initialized, but subsequent accesses past the first 128 bytes are likely caused by bugs. Reviewed by: kib Sponsored by: The FreeBSD Foundation Differential Revision: https://reviews.freebsd.org/D31338
68 lines
2.2 KiB
C
68 lines
2.2 KiB
C
/*-
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* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
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*
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* Copyright (c) 2013 The FreeBSD Foundation
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*
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* This software was developed by Konstantin Belousov <kib@FreeBSD.org>
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* under sponsorship from the FreeBSD Foundation.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#ifndef __X86_IOMMU_BUSDMA_DMAR_H
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#define __X86_IOMMU_BUSDMA_DMAR_H
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#include <dev/iommu/iommu.h>
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#include <dev/iommu/iommu_gas.h>
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struct bus_dma_tag_iommu {
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struct bus_dma_tag_common common;
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struct iommu_ctx *ctx;
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device_t owner;
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int map_count;
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bus_dma_segment_t *segments;
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};
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struct bus_dmamap_iommu {
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struct bus_dma_tag_iommu *tag;
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struct memdesc mem;
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bus_dmamap_callback_t *callback;
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void *callback_arg;
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struct iommu_map_entries_tailq map_entries;
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TAILQ_ENTRY(bus_dmamap_iommu) delay_link;
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bool locked;
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bool cansleep;
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int flags;
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#ifdef KMSAN
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struct memdesc kmsan_mem;
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#endif
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};
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#define BUS_DMAMAP_IOMMU_MALLOC 0x0001
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#define BUS_DMAMAP_IOMMU_KMEM_ALLOC 0x0002
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extern struct bus_dma_impl bus_dma_iommu_impl;
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#endif
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