331 lines
9.0 KiB
C
331 lines
9.0 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* KMSAN API for subsystems.
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*
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* Copyright (C) 2017-2022 Google LLC
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* Author: Alexander Potapenko <glider@google.com>
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*
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*/
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#ifndef _LINUX_KMSAN_H
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#define _LINUX_KMSAN_H
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#include <linux/dma-direction.h>
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#include <linux/gfp.h>
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#include <linux/kmsan-checks.h>
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#include <linux/types.h>
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struct page;
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struct kmem_cache;
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struct task_struct;
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struct scatterlist;
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struct urb;
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#ifdef CONFIG_KMSAN
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/**
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* kmsan_task_create() - Initialize KMSAN state for the task.
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* @task: task to initialize.
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*/
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void kmsan_task_create(struct task_struct *task);
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/**
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* kmsan_task_exit() - Notify KMSAN that a task has exited.
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* @task: task about to finish.
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*/
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void kmsan_task_exit(struct task_struct *task);
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/**
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* kmsan_init_shadow() - Initialize KMSAN shadow at boot time.
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*
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* Allocate and initialize KMSAN metadata for early allocations.
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*/
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void __init kmsan_init_shadow(void);
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/**
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* kmsan_init_runtime() - Initialize KMSAN state and enable KMSAN.
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*/
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void __init kmsan_init_runtime(void);
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/**
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* kmsan_memblock_free_pages() - handle freeing of memblock pages.
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* @page: struct page to free.
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* @order: order of @page.
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*
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* Freed pages are either returned to buddy allocator or held back to be used
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* as metadata pages.
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*/
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bool __init kmsan_memblock_free_pages(struct page *page, unsigned int order);
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/**
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* kmsan_alloc_page() - Notify KMSAN about an alloc_pages() call.
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* @page: struct page pointer returned by alloc_pages().
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* @order: order of allocated struct page.
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* @flags: GFP flags used by alloc_pages()
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*
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* KMSAN marks 1<<@order pages starting at @page as uninitialized, unless
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* @flags contain __GFP_ZERO.
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*/
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void kmsan_alloc_page(struct page *page, unsigned int order, gfp_t flags);
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/**
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* kmsan_free_page() - Notify KMSAN about a free_pages() call.
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* @page: struct page pointer passed to free_pages().
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* @order: order of deallocated struct page.
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*
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* KMSAN marks freed memory as uninitialized.
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*/
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void kmsan_free_page(struct page *page, unsigned int order);
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/**
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* kmsan_copy_page_meta() - Copy KMSAN metadata between two pages.
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* @dst: destination page.
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* @src: source page.
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*
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* KMSAN copies the contents of metadata pages for @src into the metadata pages
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* for @dst. If @dst has no associated metadata pages, nothing happens.
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* If @src has no associated metadata pages, @dst metadata pages are unpoisoned.
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*/
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void kmsan_copy_page_meta(struct page *dst, struct page *src);
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/**
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* kmsan_slab_alloc() - Notify KMSAN about a slab allocation.
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* @s: slab cache the object belongs to.
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* @object: object pointer.
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* @flags: GFP flags passed to the allocator.
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*
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* Depending on cache flags and GFP flags, KMSAN sets up the metadata of the
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* newly created object, marking it as initialized or uninitialized.
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*/
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void kmsan_slab_alloc(struct kmem_cache *s, void *object, gfp_t flags);
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/**
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* kmsan_slab_free() - Notify KMSAN about a slab deallocation.
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* @s: slab cache the object belongs to.
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* @object: object pointer.
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*
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* KMSAN marks the freed object as uninitialized.
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*/
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void kmsan_slab_free(struct kmem_cache *s, void *object);
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/**
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* kmsan_kmalloc_large() - Notify KMSAN about a large slab allocation.
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* @ptr: object pointer.
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* @size: object size.
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* @flags: GFP flags passed to the allocator.
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*
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* Similar to kmsan_slab_alloc(), but for large allocations.
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*/
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void kmsan_kmalloc_large(const void *ptr, size_t size, gfp_t flags);
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/**
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* kmsan_kfree_large() - Notify KMSAN about a large slab deallocation.
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* @ptr: object pointer.
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*
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* Similar to kmsan_slab_free(), but for large allocations.
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*/
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void kmsan_kfree_large(const void *ptr);
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/**
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* kmsan_map_kernel_range_noflush() - Notify KMSAN about a vmap.
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* @start: start of vmapped range.
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* @end: end of vmapped range.
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* @prot: page protection flags used for vmap.
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* @pages: array of pages.
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* @page_shift: page_shift passed to vmap_range_noflush().
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*
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* KMSAN maps shadow and origin pages of @pages into contiguous ranges in
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* vmalloc metadata address range.
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*/
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void kmsan_vmap_pages_range_noflush(unsigned long start, unsigned long end,
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pgprot_t prot, struct page **pages,
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unsigned int page_shift);
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/**
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* kmsan_vunmap_kernel_range_noflush() - Notify KMSAN about a vunmap.
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* @start: start of vunmapped range.
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* @end: end of vunmapped range.
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*
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* KMSAN unmaps the contiguous metadata ranges created by
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* kmsan_map_kernel_range_noflush().
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*/
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void kmsan_vunmap_range_noflush(unsigned long start, unsigned long end);
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/**
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* kmsan_ioremap_page_range() - Notify KMSAN about a ioremap_page_range() call.
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* @addr: range start.
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* @end: range end.
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* @phys_addr: physical range start.
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* @prot: page protection flags used for ioremap_page_range().
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* @page_shift: page_shift argument passed to vmap_range_noflush().
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*
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* KMSAN creates new metadata pages for the physical pages mapped into the
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* virtual memory.
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*/
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void kmsan_ioremap_page_range(unsigned long addr, unsigned long end,
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phys_addr_t phys_addr, pgprot_t prot,
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unsigned int page_shift);
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/**
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* kmsan_iounmap_page_range() - Notify KMSAN about a iounmap_page_range() call.
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* @start: range start.
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* @end: range end.
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*
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* KMSAN unmaps the metadata pages for the given range and, unlike for
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* vunmap_page_range(), also deallocates them.
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*/
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void kmsan_iounmap_page_range(unsigned long start, unsigned long end);
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/**
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* kmsan_handle_dma() - Handle a DMA data transfer.
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* @page: first page of the buffer.
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* @offset: offset of the buffer within the first page.
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* @size: buffer size.
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* @dir: one of possible dma_data_direction values.
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*
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* Depending on @direction, KMSAN:
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* * checks the buffer, if it is copied to device;
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* * initializes the buffer, if it is copied from device;
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* * does both, if this is a DMA_BIDIRECTIONAL transfer.
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*/
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void kmsan_handle_dma(struct page *page, size_t offset, size_t size,
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enum dma_data_direction dir);
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/**
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* kmsan_handle_dma_sg() - Handle a DMA transfer using scatterlist.
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* @sg: scatterlist holding DMA buffers.
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* @nents: number of scatterlist entries.
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* @dir: one of possible dma_data_direction values.
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*
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* Depending on @direction, KMSAN:
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* * checks the buffers in the scatterlist, if they are copied to device;
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* * initializes the buffers, if they are copied from device;
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* * does both, if this is a DMA_BIDIRECTIONAL transfer.
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*/
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void kmsan_handle_dma_sg(struct scatterlist *sg, int nents,
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enum dma_data_direction dir);
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/**
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* kmsan_handle_urb() - Handle a USB data transfer.
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* @urb: struct urb pointer.
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* @is_out: data transfer direction (true means output to hardware).
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*
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* If @is_out is true, KMSAN checks the transfer buffer of @urb. Otherwise,
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* KMSAN initializes the transfer buffer.
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*/
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void kmsan_handle_urb(const struct urb *urb, bool is_out);
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/**
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* kmsan_unpoison_entry_regs() - Handle pt_regs in low-level entry code.
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* @regs: struct pt_regs pointer received from assembly code.
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*
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* KMSAN unpoisons the contents of the passed pt_regs, preventing potential
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* false positive reports. Unlike kmsan_unpoison_memory(),
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* kmsan_unpoison_entry_regs() can be called from the regions where
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* kmsan_in_runtime() returns true, which is the case in early entry code.
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*/
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void kmsan_unpoison_entry_regs(const struct pt_regs *regs);
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#else
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static inline void kmsan_init_shadow(void)
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{
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}
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static inline void kmsan_init_runtime(void)
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{
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}
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static inline bool kmsan_memblock_free_pages(struct page *page,
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unsigned int order)
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{
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return true;
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}
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static inline void kmsan_task_create(struct task_struct *task)
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{
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}
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static inline void kmsan_task_exit(struct task_struct *task)
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{
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}
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static inline int kmsan_alloc_page(struct page *page, unsigned int order,
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gfp_t flags)
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{
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return 0;
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}
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static inline void kmsan_free_page(struct page *page, unsigned int order)
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{
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}
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static inline void kmsan_copy_page_meta(struct page *dst, struct page *src)
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{
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}
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static inline void kmsan_slab_alloc(struct kmem_cache *s, void *object,
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gfp_t flags)
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{
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}
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static inline void kmsan_slab_free(struct kmem_cache *s, void *object)
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{
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}
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static inline void kmsan_kmalloc_large(const void *ptr, size_t size,
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gfp_t flags)
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{
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}
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static inline void kmsan_kfree_large(const void *ptr)
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{
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}
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static inline void kmsan_vmap_pages_range_noflush(unsigned long start,
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unsigned long end,
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pgprot_t prot,
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struct page **pages,
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unsigned int page_shift)
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{
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}
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static inline void kmsan_vunmap_range_noflush(unsigned long start,
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unsigned long end)
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{
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}
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static inline void kmsan_ioremap_page_range(unsigned long start,
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unsigned long end,
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phys_addr_t phys_addr,
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pgprot_t prot,
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unsigned int page_shift)
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{
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}
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static inline void kmsan_iounmap_page_range(unsigned long start,
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unsigned long end)
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{
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}
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static inline void kmsan_handle_dma(struct page *page, size_t offset,
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size_t size, enum dma_data_direction dir)
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{
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}
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static inline void kmsan_handle_dma_sg(struct scatterlist *sg, int nents,
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enum dma_data_direction dir)
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{
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}
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static inline void kmsan_handle_urb(const struct urb *urb, bool is_out)
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{
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}
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static inline void kmsan_unpoison_entry_regs(const struct pt_regs *regs)
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{
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}
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#endif
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#endif /* _LINUX_KMSAN_H */
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