kasan.h

 1/* SPDX-License-Identifier: GPL-2.0 */
 2#ifndef __ASM_KASAN_H
 3#define __ASM_KASAN_H
 4
 5#ifndef __ASSEMBLER__
 6
 7#include <linux/linkage.h>
 8#include <linux/mmzone.h>
 9#include <asm/addrspace.h>
10#include <asm/io.h>
11#include <asm/pgtable.h>
12
13#define KASAN_SHADOW_SCALE_SHIFT 3
14#define KASAN_SHADOW_OFFSET	_AC(CONFIG_KASAN_SHADOW_OFFSET, UL)
15
16#define XRANGE_SHIFT (48)
17
18/* Valid address length */
19#define XRANGE_SHADOW_SHIFT	min(cpu_vabits, VA_BITS)
20/* Used for taking out the valid address */
21#define XRANGE_SHADOW_MASK	GENMASK_ULL(XRANGE_SHADOW_SHIFT - 1, 0)
22/* One segment whole address space size */
23#define XRANGE_SIZE		(XRANGE_SHADOW_MASK + 1)
24
25/* 64-bit segment value. */
26#define XKPRANGE_UC_SEG		(0x8000)
27#define XKPRANGE_CC_SEG		(0x9000)
28#define XKPRANGE_WC_SEG		(0xa000)
29#define XKVRANGE_VC_SEG		(0xffff)
30
31/* Cached */
32#define XKPRANGE_CC_START		CACHE_BASE
33#define XKPRANGE_CC_SIZE		XRANGE_SIZE
34#define XKPRANGE_CC_KASAN_OFFSET	(0)
35#define XKPRANGE_CC_SHADOW_SIZE		(XKPRANGE_CC_SIZE >> KASAN_SHADOW_SCALE_SHIFT)
36#define XKPRANGE_CC_SHADOW_END		(XKPRANGE_CC_KASAN_OFFSET + XKPRANGE_CC_SHADOW_SIZE)
37
38/* UnCached */
39#define XKPRANGE_UC_START		UNCACHE_BASE
40#define XKPRANGE_UC_SIZE		XRANGE_SIZE
41#define XKPRANGE_UC_KASAN_OFFSET	XKPRANGE_CC_SHADOW_END
42#define XKPRANGE_UC_SHADOW_SIZE		(XKPRANGE_UC_SIZE >> KASAN_SHADOW_SCALE_SHIFT)
43#define XKPRANGE_UC_SHADOW_END		(XKPRANGE_UC_KASAN_OFFSET + XKPRANGE_UC_SHADOW_SIZE)
44
45/* WriteCombine */
46#define XKPRANGE_WC_START		WRITECOMBINE_BASE
47#define XKPRANGE_WC_SIZE		XRANGE_SIZE
48#define XKPRANGE_WC_KASAN_OFFSET	XKPRANGE_UC_SHADOW_END
49#define XKPRANGE_WC_SHADOW_SIZE		(XKPRANGE_WC_SIZE >> KASAN_SHADOW_SCALE_SHIFT)
50#define XKPRANGE_WC_SHADOW_END		(XKPRANGE_WC_KASAN_OFFSET + XKPRANGE_WC_SHADOW_SIZE)
51
52/* VMALLOC (Cached or UnCached)  */
53#define XKVRANGE_VC_START		MODULES_VADDR
54#define XKVRANGE_VC_SIZE		round_up(KFENCE_AREA_END - MODULES_VADDR + 1, PGDIR_SIZE)
55#define XKVRANGE_VC_KASAN_OFFSET	XKPRANGE_WC_SHADOW_END
56#define XKVRANGE_VC_SHADOW_SIZE		(XKVRANGE_VC_SIZE >> KASAN_SHADOW_SCALE_SHIFT)
57#define XKVRANGE_VC_SHADOW_END		(XKVRANGE_VC_KASAN_OFFSET + XKVRANGE_VC_SHADOW_SIZE)
58
59/* KAsan shadow memory start right after vmalloc. */
60#define KASAN_SHADOW_START		round_up(KFENCE_AREA_END, PGDIR_SIZE)
61#define KASAN_SHADOW_SIZE		(XKVRANGE_VC_SHADOW_END - XKPRANGE_CC_KASAN_OFFSET)
62#define KASAN_SHADOW_END		(round_up(KASAN_SHADOW_START + KASAN_SHADOW_SIZE, PGDIR_SIZE) - 1)
63
64#define XKPRANGE_CC_SHADOW_OFFSET	(KASAN_SHADOW_START + XKPRANGE_CC_KASAN_OFFSET)
65#define XKPRANGE_UC_SHADOW_OFFSET	(KASAN_SHADOW_START + XKPRANGE_UC_KASAN_OFFSET)
66#define XKPRANGE_WC_SHADOW_OFFSET	(KASAN_SHADOW_START + XKPRANGE_WC_KASAN_OFFSET)
67#define XKVRANGE_VC_SHADOW_OFFSET	(KASAN_SHADOW_START + XKVRANGE_VC_KASAN_OFFSET)
68
69extern unsigned char kasan_early_shadow_page[PAGE_SIZE];
70
71#define kasan_mem_to_shadow kasan_mem_to_shadow
72void *kasan_mem_to_shadow(const void *addr);
73
74#define kasan_shadow_to_mem kasan_shadow_to_mem
75const void *kasan_shadow_to_mem(const void *shadow_addr);
76
77#define addr_has_metadata addr_has_metadata
78static __always_inline bool addr_has_metadata(const void *addr)
79{
80	return (kasan_mem_to_shadow((void *)addr) != NULL);
81}
82
83void kasan_init(void);
84asmlinkage void kasan_early_init(void);
85
86#endif
87#endif