[mirror_ubuntu-jammy-kernel.git] / arch / arm64 / mm / ptdump.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 * Copyright (c) 2014, The Linux Foundation. All rights reserved.
 * Debug helper to dump the current kernel pagetables of the system
 * so that we can see what the various memory ranges are set to.
 *
 * Derived from x86 and arm implementation:
 * (C) Copyright 2008 Intel Corporation
 *
 * Author: Arjan van de Ven <arjan@linux.intel.com>
 */
#include <linux/debugfs.h>
#include <linux/errno.h>
#include <linux/fs.h>
#include <linux/io.h>
#include <linux/init.h>
#include <linux/mm.h>
#include <linux/ptdump.h>
#include <linux/sched.h>
#include <linux/seq_file.h>

#include <asm/fixmap.h>
#include <asm/kasan.h>
#include <asm/memory.h>
#include <asm/pgtable-hwdef.h>
#include <asm/ptdump.h>


enum address_markers_idx {
	PAGE_OFFSET_NR = 0,
	PAGE_END_NR,
#if defined(CONFIG_KASAN_GENERIC) || defined(CONFIG_KASAN_SW_TAGS)
	KASAN_START_NR,
#endif
};

static struct addr_marker address_markers[] = {
	{ PAGE_OFFSET,			"Linear Mapping start" },
	{ 0 /* PAGE_END */,		"Linear Mapping end" },
#if defined(CONFIG_KASAN_GENERIC) || defined(CONFIG_KASAN_SW_TAGS)
	{ 0 /* KASAN_SHADOW_START */,	"Kasan shadow start" },
	{ KASAN_SHADOW_END,		"Kasan shadow end" },
#endif
	{ BPF_JIT_REGION_START,		"BPF start" },
	{ BPF_JIT_REGION_END,		"BPF end" },
	{ MODULES_VADDR,		"Modules start" },
	{ MODULES_END,			"Modules end" },
	{ VMALLOC_START,		"vmalloc() area" },
	{ VMALLOC_END,			"vmalloc() end" },
	{ FIXADDR_START,		"Fixmap start" },
	{ FIXADDR_TOP,			"Fixmap end" },
	{ PCI_IO_START,			"PCI I/O start" },
	{ PCI_IO_END,			"PCI I/O end" },
#ifdef CONFIG_SPARSEMEM_VMEMMAP
	{ VMEMMAP_START,		"vmemmap start" },
	{ VMEMMAP_START + VMEMMAP_SIZE,	"vmemmap end" },
#endif
	{ -1,				NULL },
};

#define pt_dump_seq_printf(m, fmt, args...)	\
({						\
	if (m)					\
		seq_printf(m, fmt, ##args);	\
})

#define pt_dump_seq_puts(m, fmt)	\
({					\
	if (m)				\
		seq_printf(m, fmt);	\
})

/*
 * The page dumper groups page table entries of the same type into a single
 * description. It uses pg_state to track the range information while
 * iterating over the pte entries. When the continuity is broken it then
 * dumps out a description of the range.
 */
struct pg_state {
	struct ptdump_state ptdump;
	struct seq_file *seq;
	const struct addr_marker *marker;
	unsigned long start_address;
	int level;
	u64 current_prot;
	bool check_wx;
	unsigned long wx_pages;
	unsigned long uxn_pages;
};

struct prot_bits {
	u64		mask;
	u64		val;
	const char	*set;
	const char	*clear;
};

static const struct prot_bits pte_bits[] = {
	{
		.mask	= PTE_VALID,
		.val	= PTE_VALID,
		.set	= " ",
		.clear	= "F",
	}, {
		.mask	= PTE_USER,
		.val	= PTE_USER,
		.set	= "USR",
		.clear	= "   ",
	}, {
		.mask	= PTE_RDONLY,
		.val	= PTE_RDONLY,
		.set	= "ro",
		.clear	= "RW",
	}, {
		.mask	= PTE_PXN,
		.val	= PTE_PXN,
		.set	= "NX",
		.clear	= "x ",
	}, {
		.mask	= PTE_SHARED,
		.val	= PTE_SHARED,
		.set	= "SHD",
		.clear	= "   ",
	}, {
		.mask	= PTE_AF,
		.val	= PTE_AF,
		.set	= "AF",
		.clear	= "  ",
	}, {
		.mask	= PTE_NG,
		.val	= PTE_NG,
		.set	= "NG",
		.clear	= "  ",
	}, {
		.mask	= PTE_CONT,
		.val	= PTE_CONT,
		.set	= "CON",
		.clear	= "   ",
	}, {
		.mask	= PTE_TABLE_BIT,
		.val	= PTE_TABLE_BIT,
		.set	= "   ",
		.clear	= "BLK",
	}, {
		.mask	= PTE_UXN,
		.val	= PTE_UXN,
		.set	= "UXN",
		.clear	= "   ",
	}, {
		.mask	= PTE_GP,
		.val	= PTE_GP,
		.set	= "GP",
		.clear	= "  ",
	}, {
		.mask	= PTE_ATTRINDX_MASK,
		.val	= PTE_ATTRINDX(MT_DEVICE_nGnRnE),
		.set	= "DEVICE/nGnRnE",
	}, {
		.mask	= PTE_ATTRINDX_MASK,
		.val	= PTE_ATTRINDX(MT_DEVICE_nGnRE),
		.set	= "DEVICE/nGnRE",
	}, {
		.mask	= PTE_ATTRINDX_MASK,
		.val	= PTE_ATTRINDX(MT_DEVICE_GRE),
		.set	= "DEVICE/GRE",
	}, {
		.mask	= PTE_ATTRINDX_MASK,
		.val	= PTE_ATTRINDX(MT_NORMAL_NC),
		.set	= "MEM/NORMAL-NC",
	}, {
		.mask	= PTE_ATTRINDX_MASK,
		.val	= PTE_ATTRINDX(MT_NORMAL),
		.set	= "MEM/NORMAL",
	}, {
		.mask	= PTE_ATTRINDX_MASK,
		.val	= PTE_ATTRINDX(MT_NORMAL_TAGGED),
		.set	= "MEM/NORMAL-TAGGED",
	}
};

struct pg_level {
	const struct prot_bits *bits;
	const char *name;
	size_t num;
	u64 mask;
};

static struct pg_level pg_level[] = {
	{ /* pgd */
		.name	= "PGD",
		.bits	= pte_bits,
		.num	= ARRAY_SIZE(pte_bits),
	}, { /* p4d */
		.name	= "P4D",
		.bits	= pte_bits,
		.num	= ARRAY_SIZE(pte_bits),
	}, { /* pud */
		.name	= (CONFIG_PGTABLE_LEVELS > 3) ? "PUD" : "PGD",
		.bits	= pte_bits,
		.num	= ARRAY_SIZE(pte_bits),
	}, { /* pmd */
		.name	= (CONFIG_PGTABLE_LEVELS > 2) ? "PMD" : "PGD",
		.bits	= pte_bits,
		.num	= ARRAY_SIZE(pte_bits),
	}, { /* pte */
		.name	= "PTE",
		.bits	= pte_bits,
		.num	= ARRAY_SIZE(pte_bits),
	},
};

static void dump_prot(struct pg_state *st, const struct prot_bits *bits,
			size_t num)
{
	unsigned i;

	for (i = 0; i < num; i++, bits++) {
		const char *s;

		if ((st->current_prot & bits->mask) == bits->val)
			s = bits->set;
		else
			s = bits->clear;

		if (s)
			pt_dump_seq_printf(st->seq, " %s", s);
	}
}

static void note_prot_uxn(struct pg_state *st, unsigned long addr)
{
	if (!st->check_wx)
		return;

	if ((st->current_prot & PTE_UXN) == PTE_UXN)
		return;

	WARN_ONCE(1, "arm64/mm: Found non-UXN mapping at address %p/%pS\n",
		  (void *)st->start_address, (void *)st->start_address);

	st->uxn_pages += (addr - st->start_address) / PAGE_SIZE;
}

static void note_prot_wx(struct pg_state *st, unsigned long addr)
{
	if (!st->check_wx)
		return;
	if ((st->current_prot & PTE_RDONLY) == PTE_RDONLY)
		return;
	if ((st->current_prot & PTE_PXN) == PTE_PXN)
		return;

	WARN_ONCE(1, "arm64/mm: Found insecure W+X mapping at address %p/%pS\n",
		  (void *)st->start_address, (void *)st->start_address);

	st->wx_pages += (addr - st->start_address) / PAGE_SIZE;
}

static void note_page(struct ptdump_state *pt_st, unsigned long addr, int level,
		      u64 val)
{
	struct pg_state *st = container_of(pt_st, struct pg_state, ptdump);
	static const char units[] = "KMGTPE";
	u64 prot = 0;

	if (level >= 0)
		prot = val & pg_level[level].mask;

	if (st->level == -1) {
		st->level = level;
		st->current_prot = prot;
		st->start_address = addr;
		pt_dump_seq_printf(st->seq, "---[ %s ]---\n", st->marker->name);
	} else if (prot != st->current_prot || level != st->level ||
		   addr >= st->marker[1].start_address) {
		const char *unit = units;
		unsigned long delta;

		if (st->current_prot) {
			note_prot_uxn(st, addr);
			note_prot_wx(st, addr);
		}

		pt_dump_seq_printf(st->seq, "0x%016lx-0x%016lx   ",
				   st->start_address, addr);

		delta = (addr - st->start_address) >> 10;
		while (!(delta & 1023) && unit[1]) {
			delta >>= 10;
			unit++;
		}
		pt_dump_seq_printf(st->seq, "%9lu%c %s", delta, *unit,
				   pg_level[st->level].name);
		if (st->current_prot && pg_level[st->level].bits)
			dump_prot(st, pg_level[st->level].bits,
				  pg_level[st->level].num);
		pt_dump_seq_puts(st->seq, "\n");

		if (addr >= st->marker[1].start_address) {
			st->marker++;
			pt_dump_seq_printf(st->seq, "---[ %s ]---\n", st->marker->name);
		}

		st->start_address = addr;
		st->current_prot = prot;
		st->level = level;
	}

	if (addr >= st->marker[1].start_address) {
		st->marker++;
		pt_dump_seq_printf(st->seq, "---[ %s ]---\n", st->marker->name);
	}

}

void ptdump_walk(struct seq_file *s, struct ptdump_info *info)
{
	unsigned long end = ~0UL;
	struct pg_state st;

	if (info->base_addr < TASK_SIZE_64)
		end = TASK_SIZE_64;

	st = (struct pg_state){
		.seq = s,
		.marker = info->markers,
		.level = -1,
		.ptdump = {
			.note_page = note_page,
			.range = (struct ptdump_range[]){
				{info->base_addr, end},
				{0, 0}
			}
		}
	};

	ptdump_walk_pgd(&st.ptdump, info->mm, NULL);
}

static void __init ptdump_initialize(void)
{
	unsigned i, j;

	for (i = 0; i < ARRAY_SIZE(pg_level); i++)
		if (pg_level[i].bits)
			for (j = 0; j < pg_level[i].num; j++)
				pg_level[i].mask |= pg_level[i].bits[j].mask;
}

static struct ptdump_info kernel_ptdump_info = {
	.mm		= &init_mm,
	.markers	= address_markers,
	.base_addr	= PAGE_OFFSET,
};

void ptdump_check_wx(void)
{
	struct pg_state st = {
		.seq = NULL,
		.marker = (struct addr_marker[]) {
			{ 0, NULL},
			{ -1, NULL},
		},
		.level = -1,
		.check_wx = true,
		.ptdump = {
			.note_page = note_page,
			.range = (struct ptdump_range[]) {
				{PAGE_OFFSET, ~0UL},
				{0, 0}
			}
		}
	};

	ptdump_walk_pgd(&st.ptdump, &init_mm, NULL);

	if (st.wx_pages || st.uxn_pages)
		pr_warn("Checked W+X mappings: FAILED, %lu W+X pages found, %lu non-UXN pages found\n",
			st.wx_pages, st.uxn_pages);
	else
		pr_info("Checked W+X mappings: passed, no W+X pages found\n");
}

static int __init ptdump_init(void)
{
	address_markers[PAGE_END_NR].start_address = PAGE_END;
#if defined(CONFIG_KASAN_GENERIC) || defined(CONFIG_KASAN_SW_TAGS)
	address_markers[KASAN_START_NR].start_address = KASAN_SHADOW_START;
#endif
	ptdump_initialize();
	ptdump_debugfs_register(&kernel_ptdump_info, "kernel_page_tables");
	return 0;
}
device_initcall(ptdump_init);
Commit	Line	Data
b886d83c	1	// SPDX-License-Identifier: GPL-2.0-only
c9465b4e LA	2	/*
	3	* Copyright (c) 2014, The Linux Foundation. All rights reserved.
	4	* Debug helper to dump the current kernel pagetables of the system
	5	* so that we can see what the various memory ranges are set to.
	6	*
	7	* Derived from x86 and arm implementation:
	8	* (C) Copyright 2008 Intel Corporation
	9	*
	10	* Author: Arjan van de Ven <arjan@linux.intel.com>
c9465b4e LA	11	*/
c9465b4e LA	12	#include <linux/debugfs.h>
764011ca	13	#include <linux/errno.h>
c9465b4e	14	#include <linux/fs.h>
284be285	15	#include <linux/io.h>
764011ca	16	#include <linux/init.h>
c9465b4e	17	#include <linux/mm.h>
102f45fd	18	#include <linux/ptdump.h>
c9465b4e LA	19	#include <linux/sched.h>
	20	#include <linux/seq_file.h>
	21
	22	#include <asm/fixmap.h>
d8fc68a0	23	#include <asm/kasan.h>
764011ca	24	#include <asm/memory.h>
764011ca	25	#include <asm/pgtable-hwdef.h>
4674fdb9	26	#include <asm/ptdump.h>
c9465b4e	27
99426e5e SC	28
	29	enum address_markers_idx {
	30	PAGE_OFFSET_NR = 0,
77ad4ce6	31	PAGE_END_NR,
0fea6e9a	32	#if defined(CONFIG_KASAN_GENERIC) \|\| defined(CONFIG_KASAN_SW_TAGS)
99426e5e SC	33	KASAN_START_NR,
	34	#endif
	35	};
	36
	37	static struct addr_marker address_markers[] = {
14c127c9	38	{ PAGE_OFFSET, "Linear Mapping start" },
77ad4ce6	39	{ 0 /* PAGE_END */, "Linear Mapping end" },
0fea6e9a	40	#if defined(CONFIG_KASAN_GENERIC) \|\| defined(CONFIG_KASAN_SW_TAGS)
99426e5e	41	{ 0 /* KASAN_SHADOW_START */, "Kasan shadow start" },
d8fc68a0 AB	42	{ KASAN_SHADOW_END, "Kasan shadow end" },
d8fc68a0 AB	43	#endif
c048ddf8 AK	44	{ BPF_JIT_REGION_START, "BPF start" },
c048ddf8 AK	45	{ BPF_JIT_REGION_END, "BPF end" },
c8f8cca4 AB	46	{ MODULES_VADDR, "Modules start" },
c8f8cca4 AB	47	{ MODULES_END, "Modules end" },
4733c7c7 WD	48	{ VMALLOC_START, "vmalloc() area" },
4733c7c7 WD	49	{ VMALLOC_END, "vmalloc() end" },
c8f8cca4 AB	50	{ FIXADDR_START, "Fixmap start" },
	51	{ FIXADDR_TOP, "Fixmap end" },
	52	{ PCI_IO_START, "PCI I/O start" },
	53	{ PCI_IO_END, "PCI I/O end" },
3e1907d5	54	#ifdef CONFIG_SPARSEMEM_VMEMMAP
c8f8cca4 AB	55	{ VMEMMAP_START, "vmemmap start" },
c8f8cca4 AB	56	{ VMEMMAP_START + VMEMMAP_SIZE, "vmemmap end" },
3e1907d5	57	#endif
c8f8cca4	58	{ -1, NULL },
c9465b4e LA	59	};
c9465b4e LA	60
ae5d1cf3 LA	61	#define pt_dump_seq_printf(m, fmt, args...) \
	62	({ \
	63	if (m) \
	64	seq_printf(m, fmt, ##args); \
	65	})
	66
	67	#define pt_dump_seq_puts(m, fmt) \
	68	({ \
	69	if (m) \
	70	seq_printf(m, fmt); \
	71	})
	72
202e41a1 JL	73	/*
	74	* The page dumper groups page table entries of the same type into a single
	75	* description. It uses pg_state to track the range information while
	76	* iterating over the pte entries. When the continuity is broken it then
	77	* dumps out a description of the range.
	78	*/
c9465b4e	79	struct pg_state {
102f45fd	80	struct ptdump_state ptdump;
c9465b4e LA	81	struct seq_file *seq;
	82	const struct addr_marker *marker;
	83	unsigned long start_address;
102f45fd	84	int level;
c9465b4e	85	u64 current_prot;
1404d6f1 LA	86	bool check_wx;
	87	unsigned long wx_pages;
	88	unsigned long uxn_pages;
c9465b4e LA	89	};
	90
	91	struct prot_bits {
	92	u64 mask;
	93	u64 val;
	94	const char *set;
	95	const char *clear;
	96	};
	97
	98	static const struct prot_bits pte_bits[] = {
	99	{
d7e9d594 LA	100	.mask = PTE_VALID,
	101	.val = PTE_VALID,
	102	.set = " ",
	103	.clear = "F",
	104	}, {
c9465b4e LA	105	.mask = PTE_USER,
	106	.val = PTE_USER,
	107	.set = "USR",
	108	.clear = " ",
	109	}, {
	110	.mask = PTE_RDONLY,
	111	.val = PTE_RDONLY,
	112	.set = "ro",
	113	.clear = "RW",
	114	}, {
	115	.mask = PTE_PXN,
	116	.val = PTE_PXN,
	117	.set = "NX",
	118	.clear = "x ",
	119	}, {
	120	.mask = PTE_SHARED,
	121	.val = PTE_SHARED,
	122	.set = "SHD",
	123	.clear = " ",
	124	}, {
	125	.mask = PTE_AF,
	126	.val = PTE_AF,
	127	.set = "AF",
	128	.clear = " ",
	129	}, {
	130	.mask = PTE_NG,
	131	.val = PTE_NG,
	132	.set = "NG",
	133	.clear = " ",
202e41a1 JL	134	}, {
	135	.mask = PTE_CONT,
	136	.val = PTE_CONT,
	137	.set = "CON",
	138	.clear = " ",
	139	}, {
	140	.mask = PTE_TABLE_BIT,
	141	.val = PTE_TABLE_BIT,
	142	.set = " ",
	143	.clear = "BLK",
c9465b4e LA	144	}, {
	145	.mask = PTE_UXN,
	146	.val = PTE_UXN,
	147	.set = "UXN",
cba779d8	148	.clear = " ",
de48bb36 MB	149	}, {
	150	.mask = PTE_GP,
	151	.val = PTE_GP,
	152	.set = "GP",
	153	.clear = " ",
c9465b4e LA	154	}, {
	155	.mask = PTE_ATTRINDX_MASK,
	156	.val = PTE_ATTRINDX(MT_DEVICE_nGnRnE),
	157	.set = "DEVICE/nGnRnE",
	158	}, {
	159	.mask = PTE_ATTRINDX_MASK,
	160	.val = PTE_ATTRINDX(MT_DEVICE_nGnRE),
	161	.set = "DEVICE/nGnRE",
	162	}, {
	163	.mask = PTE_ATTRINDX_MASK,
	164	.val = PTE_ATTRINDX(MT_DEVICE_GRE),
	165	.set = "DEVICE/GRE",
	166	}, {
	167	.mask = PTE_ATTRINDX_MASK,
	168	.val = PTE_ATTRINDX(MT_NORMAL_NC),
	169	.set = "MEM/NORMAL-NC",
	170	}, {
	171	.mask = PTE_ATTRINDX_MASK,
	172	.val = PTE_ATTRINDX(MT_NORMAL),
	173	.set = "MEM/NORMAL",
0178dc76 CM	174	}, {
	175	.mask = PTE_ATTRINDX_MASK,
	176	.val = PTE_ATTRINDX(MT_NORMAL_TAGGED),
	177	.set = "MEM/NORMAL-TAGGED",
c9465b4e LA	178	}
	179	};
	180
	181	struct pg_level {
	182	const struct prot_bits *bits;
48dd73c5	183	const char *name;
c9465b4e LA	184	size_t num;
	185	u64 mask;
	186	};
	187
	188	static struct pg_level pg_level[] = {
f8f0d0b6	189	{ /* pgd */
48dd73c5	190	.name = "PGD",
c9465b4e LA	191	.bits = pte_bits,
c9465b4e LA	192	.num = ARRAY_SIZE(pte_bits),
102f45fd SP	193	}, { /* p4d */
	194	.name = "P4D",
	195	.bits = pte_bits,
	196	.num = ARRAY_SIZE(pte_bits),
c9465b4e	197	}, { /* pud */
48dd73c5	198	.name = (CONFIG_PGTABLE_LEVELS > 3) ? "PUD" : "PGD",
c9465b4e LA	199	.bits = pte_bits,
	200	.num = ARRAY_SIZE(pte_bits),
	201	}, { /* pmd */
48dd73c5	202	.name = (CONFIG_PGTABLE_LEVELS > 2) ? "PMD" : "PGD",
c9465b4e LA	203	.bits = pte_bits,
	204	.num = ARRAY_SIZE(pte_bits),
	205	}, { /* pte */
48dd73c5	206	.name = "PTE",
c9465b4e LA	207	.bits = pte_bits,
	208	.num = ARRAY_SIZE(pte_bits),
	209	},
	210	};
	211
	212	static void dump_prot(struct pg_state st, const struct prot_bits bits,
	213	size_t num)
	214	{
	215	unsigned i;
	216
	217	for (i = 0; i < num; i++, bits++) {
	218	const char *s;
	219
	220	if ((st->current_prot & bits->mask) == bits->val)
	221	s = bits->set;
	222	else
	223	s = bits->clear;
	224
	225	if (s)
ae5d1cf3	226	pt_dump_seq_printf(st->seq, " %s", s);
c9465b4e LA	227	}
	228	}
	229
1404d6f1 LA	230	static void note_prot_uxn(struct pg_state *st, unsigned long addr)
	231	{
	232	if (!st->check_wx)
	233	return;
	234
	235	if ((st->current_prot & PTE_UXN) == PTE_UXN)
	236	return;
	237
	238	WARN_ONCE(1, "arm64/mm: Found non-UXN mapping at address %p/%pS\n",
	239	(void )st->start_address, (void )st->start_address);
	240
	241	st->uxn_pages += (addr - st->start_address) / PAGE_SIZE;
	242	}
	243
	244	static void note_prot_wx(struct pg_state *st, unsigned long addr)
	245	{
	246	if (!st->check_wx)
	247	return;
	248	if ((st->current_prot & PTE_RDONLY) == PTE_RDONLY)
	249	return;
	250	if ((st->current_prot & PTE_PXN) == PTE_PXN)
	251	return;
	252
	253	WARN_ONCE(1, "arm64/mm: Found insecure W+X mapping at address %p/%pS\n",
	254	(void )st->start_address, (void )st->start_address);
	255
	256	st->wx_pages += (addr - st->start_address) / PAGE_SIZE;
	257	}
	258
102f45fd	259	static void note_page(struct ptdump_state *pt_st, unsigned long addr, int level,
99395ee3	260	u64 val)
c9465b4e	261	{
102f45fd	262	struct pg_state *st = container_of(pt_st, struct pg_state, ptdump);
c9465b4e	263	static const char units[] = "KMGTPE";
102f45fd SP	264	u64 prot = 0;
	265
	266	if (level >= 0)
	267	prot = val & pg_level[level].mask;
c9465b4e	268
f8f0d0b6	269	if (st->level == -1) {
c9465b4e LA	270	st->level = level;
	271	st->current_prot = prot;
	272	st->start_address = addr;
ae5d1cf3	273	pt_dump_seq_printf(st->seq, "---[ %s ]---\n", st->marker->name);
c9465b4e LA	274	} else if (prot != st->current_prot \|\| level != st->level \|\|
	275	addr >= st->marker[1].start_address) {
	276	const char *unit = units;
	277	unsigned long delta;
	278
	279	if (st->current_prot) {
1404d6f1 LA	280	note_prot_uxn(st, addr);
1404d6f1 LA	281	note_prot_wx(st, addr);
9c7869c7 SP	282	}
	283
	284	pt_dump_seq_printf(st->seq, "0x%016lx-0x%016lx ",
c9465b4e LA	285	st->start_address, addr);
c9465b4e LA	286
9c7869c7 SP	287	delta = (addr - st->start_address) >> 10;
	288	while (!(delta & 1023) && unit[1]) {
	289	delta >>= 10;
	290	unit++;
c9465b4e	291	}
9c7869c7 SP	292	pt_dump_seq_printf(st->seq, "%9lu%c %s", delta, *unit,
	293	pg_level[st->level].name);
	294	if (st->current_prot && pg_level[st->level].bits)
	295	dump_prot(st, pg_level[st->level].bits,
	296	pg_level[st->level].num);
	297	pt_dump_seq_puts(st->seq, "\n");
c9465b4e LA	298
	299	if (addr >= st->marker[1].start_address) {
	300	st->marker++;
ae5d1cf3	301	pt_dump_seq_printf(st->seq, "---[ %s ]---\n", st->marker->name);
c9465b4e LA	302	}
	303
	304	st->start_address = addr;
	305	st->current_prot = prot;
	306	st->level = level;
	307	}
	308
	309	if (addr >= st->marker[1].start_address) {
	310	st->marker++;
ae5d1cf3	311	pt_dump_seq_printf(st->seq, "---[ %s ]---\n", st->marker->name);
c9465b4e LA	312	}
	313
	314	}
	315
102f45fd	316	void ptdump_walk(struct seq_file s, struct ptdump_info info)
c9465b4e	317	{
102f45fd SP	318	unsigned long end = ~0UL;
102f45fd SP	319	struct pg_state st;
c9465b4e	320
102f45fd SP	321	if (info->base_addr < TASK_SIZE_64)
102f45fd SP	322	end = TASK_SIZE_64;
c9465b4e	323
102f45fd SP	324	st = (struct pg_state){
102f45fd SP	325	.seq = s,
4674fdb9	326	.marker = info->markers,
b9ba6809	327	.level = -1,
102f45fd SP	328	.ptdump = {
	329	.note_page = note_page,
	330	.range = (struct ptdump_range[]){
	331	{info->base_addr, end},
	332	{0, 0}
	333	}
	334	}
c9465b4e LA	335	};
c9465b4e LA	336
e47690d7	337	ptdump_walk_pgd(&st.ptdump, info->mm, NULL);
c9465b4e LA	338	}
c9465b4e LA	339
a7dcf58a	340	static void __init ptdump_initialize(void)
c9465b4e	341	{
c9465b4e LA	342	unsigned i, j;
	343
	344	for (i = 0; i < ARRAY_SIZE(pg_level); i++)
	345	if (pg_level[i].bits)
	346	for (j = 0; j < pg_level[i].num; j++)
	347	pg_level[i].mask \|= pg_level[i].bits[j].mask;
c9465b4e	348	}
4674fdb9 MR	349
	350	static struct ptdump_info kernel_ptdump_info = {
	351	.mm = &init_mm,
	352	.markers = address_markers,
14c127c9	353	.base_addr = PAGE_OFFSET,
4674fdb9 MR	354	};
4674fdb9 MR	355
1404d6f1 LA	356	void ptdump_check_wx(void)
	357	{
	358	struct pg_state st = {
	359	.seq = NULL,
	360	.marker = (struct addr_marker[]) {
	361	{ 0, NULL},
	362	{ -1, NULL},
	363	},
f8f0d0b6	364	.level = -1,
1404d6f1	365	.check_wx = true,
102f45fd SP	366	.ptdump = {
	367	.note_page = note_page,
	368	.range = (struct ptdump_range[]) {
	369	{PAGE_OFFSET, ~0UL},
	370	{0, 0}
	371	}
	372	}
1404d6f1 LA	373	};
1404d6f1 LA	374
e47690d7	375	ptdump_walk_pgd(&st.ptdump, &init_mm, NULL);
102f45fd	376
1404d6f1 LA	377	if (st.wx_pages \|\| st.uxn_pages)
	378	pr_warn("Checked W+X mappings: FAILED, %lu W+X pages found, %lu non-UXN pages found\n",
	379	st.wx_pages, st.uxn_pages);
	380	else
	381	pr_info("Checked W+X mappings: passed, no W+X pages found\n");
	382	}
	383
a7dcf58a	384	static int __init ptdump_init(void)
4674fdb9	385	{
77ad4ce6	386	address_markers[PAGE_END_NR].start_address = PAGE_END;
0fea6e9a	387	#if defined(CONFIG_KASAN_GENERIC) \|\| defined(CONFIG_KASAN_SW_TAGS)
99426e5e SC	388	address_markers[KASAN_START_NR].start_address = KASAN_SHADOW_START;
99426e5e SC	389	#endif
4ddb9bf8	390	ptdump_initialize();
e2a2e56e GKH	391	ptdump_debugfs_register(&kernel_ptdump_info, "kernel_page_tables");
e2a2e56e GKH	392	return 0;
4674fdb9	393	}
c9465b4e	394	device_initcall(ptdump_init);