Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   1) // SPDX-License-Identifier: GPL-2.0-only
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   3)  * Copyright (C) 2019 SiFive
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   4)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   5) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   6) #include <linux/efi.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   7) #include <linux/init.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   8) #include <linux/debugfs.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   9) #include <linux/seq_file.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  10) #include <linux/ptdump.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  11) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  12) #include <asm/ptdump.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  13) #include <linux/pgtable.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  14) #include <asm/kasan.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  15) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  16) #define pt_dump_seq_printf(m, fmt, args...)	\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  17) ({						\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  18) 	if (m)					\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  19) 		seq_printf(m, fmt, ##args);	\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  20) })
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  21) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  22) #define pt_dump_seq_puts(m, fmt)	\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  23) ({					\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  24) 	if (m)				\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  25) 		seq_printf(m, fmt);	\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  26) })
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  27) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  28) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  29)  * The page dumper groups page table entries of the same type into a single
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  30)  * description. It uses pg_state to track the range information while
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  31)  * iterating over the pte entries. When the continuity is broken it then
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  32)  * dumps out a description of the range.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  33)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  34) struct pg_state {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  35) 	struct ptdump_state ptdump;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  36) 	struct seq_file *seq;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  37) 	const struct addr_marker *marker;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  38) 	unsigned long start_address;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  39) 	unsigned long start_pa;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  40) 	unsigned long last_pa;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  41) 	int level;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  42) 	u64 current_prot;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  43) 	bool check_wx;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  44) 	unsigned long wx_pages;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  45) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  46) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  47) /* Address marker */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  48) struct addr_marker {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  49) 	unsigned long start_address;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  50) 	const char *name;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  51) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  52) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  53) /* Private information for debugfs */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  54) struct ptd_mm_info {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  55) 	struct mm_struct		*mm;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  56) 	const struct addr_marker	*markers;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  57) 	unsigned long base_addr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  58) 	unsigned long end;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  59) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  60) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  61) static struct addr_marker address_markers[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  62) #ifdef CONFIG_KASAN
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  63) 	{KASAN_SHADOW_START,	"Kasan shadow start"},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  64) 	{KASAN_SHADOW_END,	"Kasan shadow end"},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  65) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  66) 	{FIXADDR_START,		"Fixmap start"},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  67) 	{FIXADDR_TOP,		"Fixmap end"},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  68) 	{PCI_IO_START,		"PCI I/O start"},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  69) 	{PCI_IO_END,		"PCI I/O end"},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  70) #ifdef CONFIG_SPARSEMEM_VMEMMAP
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  71) 	{VMEMMAP_START,		"vmemmap start"},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  72) 	{VMEMMAP_END,		"vmemmap end"},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  73) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  74) 	{VMALLOC_START,		"vmalloc() area"},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  75) 	{VMALLOC_END,		"vmalloc() end"},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  76) 	{PAGE_OFFSET,		"Linear mapping"},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  77) 	{-1, NULL},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  78) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  79) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  80) static struct ptd_mm_info kernel_ptd_info = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  81) 	.mm		= &init_mm,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  82) 	.markers	= address_markers,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  83) 	.base_addr	= KERN_VIRT_START,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  84) 	.end		= ULONG_MAX,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  85) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  86) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  87) #ifdef CONFIG_EFI
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  88) static struct addr_marker efi_addr_markers[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  89) 		{ 0,		"UEFI runtime start" },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  90) 		{ SZ_1G,	"UEFI runtime end" },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  91) 		{ -1,		NULL }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  92) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  93) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  94) static struct ptd_mm_info efi_ptd_info = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  95) 	.mm		= &efi_mm,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  96) 	.markers	= efi_addr_markers,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  97) 	.base_addr	= 0,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  98) 	.end		= SZ_2G,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  99) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) /* Page Table Entry */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) struct prot_bits {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) 	u64 mask;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) 	u64 val;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) 	const char *set;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) 	const char *clear;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) static const struct prot_bits pte_bits[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) 	{
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) 		.mask = _PAGE_SOFT,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) 		.val = _PAGE_SOFT,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) 		.set = "RSW",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) 		.clear = "   ",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) 	}, {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) 		.mask = _PAGE_DIRTY,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) 		.val = _PAGE_DIRTY,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) 		.set = "D",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) 		.clear = ".",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) 	}, {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) 		.mask = _PAGE_ACCESSED,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) 		.val = _PAGE_ACCESSED,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) 		.set = "A",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) 		.clear = ".",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) 	}, {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) 		.mask = _PAGE_GLOBAL,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) 		.val = _PAGE_GLOBAL,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) 		.set = "G",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) 		.clear = ".",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) 	}, {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) 		.mask = _PAGE_USER,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) 		.val = _PAGE_USER,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) 		.set = "U",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) 		.clear = ".",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) 	}, {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) 		.mask = _PAGE_EXEC,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) 		.val = _PAGE_EXEC,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) 		.set = "X",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) 		.clear = ".",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) 	}, {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) 		.mask = _PAGE_WRITE,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) 		.val = _PAGE_WRITE,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) 		.set = "W",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) 		.clear = ".",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) 	}, {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) 		.mask = _PAGE_READ,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) 		.val = _PAGE_READ,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) 		.set = "R",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) 		.clear = ".",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) 	}, {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) 		.mask = _PAGE_PRESENT,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) 		.val = _PAGE_PRESENT,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) 		.set = "V",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) 		.clear = ".",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) /* Page Level */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) struct pg_level {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) 	const char *name;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) 	u64 mask;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) static struct pg_level pg_level[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) 	{ /* pgd */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) 		.name = "PGD",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) 	}, { /* p4d */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) 		.name = (CONFIG_PGTABLE_LEVELS > 4) ? "P4D" : "PGD",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) 	}, { /* pud */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) 		.name = (CONFIG_PGTABLE_LEVELS > 3) ? "PUD" : "PGD",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) 	}, { /* pmd */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) 		.name = (CONFIG_PGTABLE_LEVELS > 2) ? "PMD" : "PGD",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) 	}, { /* pte */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) 		.name = "PTE",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) 	},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) static void dump_prot(struct pg_state *st)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) 	unsigned int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) 	for (i = 0; i < ARRAY_SIZE(pte_bits); i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) 		const char *s;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) 		if ((st->current_prot & pte_bits[i].mask) == pte_bits[i].val)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) 			s = pte_bits[i].set;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) 		else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) 			s = pte_bits[i].clear;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) 		if (s)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) 			pt_dump_seq_printf(st->seq, " %s", s);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) #ifdef CONFIG_64BIT
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) #define ADDR_FORMAT	"0x%016lx"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) #else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) #define ADDR_FORMAT	"0x%08lx"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) static void dump_addr(struct pg_state *st, unsigned long addr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) 	static const char units[] = "KMGTPE";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) 	const char *unit = units;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) 	unsigned long delta;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) 	pt_dump_seq_printf(st->seq, ADDR_FORMAT "-" ADDR_FORMAT "   ",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) 			   st->start_address, addr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) 	pt_dump_seq_printf(st->seq, " " ADDR_FORMAT " ", st->start_pa);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) 	delta = (addr - st->start_address) >> 10;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) 	while (!(delta & 1023) && unit[1]) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) 		delta >>= 10;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) 		unit++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) 	pt_dump_seq_printf(st->seq, "%9lu%c %s", delta, *unit,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) 			   pg_level[st->level].name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) static void note_prot_wx(struct pg_state *st, unsigned long addr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) 	if (!st->check_wx)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) 		return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) 	if ((st->current_prot & (_PAGE_WRITE | _PAGE_EXEC)) !=
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) 	    (_PAGE_WRITE | _PAGE_EXEC))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) 		return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) 	WARN_ONCE(1, "riscv/mm: Found insecure W+X mapping at address %p/%pS\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) 		  (void *)st->start_address, (void *)st->start_address);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) 	st->wx_pages += (addr - st->start_address) / PAGE_SIZE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) static void note_page(struct ptdump_state *pt_st, unsigned long addr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) 		      int level, u64 val)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) 	struct pg_state *st = container_of(pt_st, struct pg_state, ptdump);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) 	u64 pa = PFN_PHYS(pte_pfn(__pte(val)));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) 	u64 prot = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) 	if (level >= 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) 		prot = val & pg_level[level].mask;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) 	if (st->level == -1) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) 		st->level = level;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) 		st->current_prot = prot;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) 		st->start_address = addr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) 		st->start_pa = pa;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) 		st->last_pa = pa;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) 		pt_dump_seq_printf(st->seq, "---[ %s ]---\n", st->marker->name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) 	} else if (prot != st->current_prot ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) 		   level != st->level || addr >= st->marker[1].start_address) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) 		if (st->current_prot) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) 			note_prot_wx(st, addr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) 			dump_addr(st, addr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) 			dump_prot(st);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) 			pt_dump_seq_puts(st->seq, "\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) 		while (addr >= st->marker[1].start_address) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) 			st->marker++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) 			pt_dump_seq_printf(st->seq, "---[ %s ]---\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) 					   st->marker->name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) 		st->start_address = addr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) 		st->start_pa = pa;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) 		st->last_pa = pa;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) 		st->current_prot = prot;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) 		st->level = level;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) 	} else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) 		st->last_pa = pa;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) static void ptdump_walk(struct seq_file *s, struct ptd_mm_info *pinfo)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) 	struct pg_state st = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) 		.seq = s,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) 		.marker = pinfo->markers,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) 		.level = -1,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) 		.ptdump = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) 			.note_page = note_page,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) 			.range = (struct ptdump_range[]) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) 				{pinfo->base_addr, pinfo->end},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) 				{0, 0}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) 			}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) 	};
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) 	ptdump_walk_pgd(&st.ptdump, pinfo->mm, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) void ptdump_check_wx(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) 	struct pg_state st = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) 		.seq = NULL,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) 		.marker = (struct addr_marker[]) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) 			{0, NULL},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) 			{-1, NULL},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) 		},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) 		.level = -1,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) 		.check_wx = true,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) 		.ptdump = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308) 			.note_page = note_page,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309) 			.range = (struct ptdump_range[]) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310) 				{KERN_VIRT_START, ULONG_MAX},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) 				{0, 0}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312) 			}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) 	};
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316) 	ptdump_walk_pgd(&st.ptdump, &init_mm, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318) 	if (st.wx_pages)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319) 		pr_warn("Checked W+X mappings: failed, %lu W+X pages found\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320) 			st.wx_pages);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321) 	else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322) 		pr_info("Checked W+X mappings: passed, no W+X pages found\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325) static int ptdump_show(struct seq_file *m, void *v)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327) 	ptdump_walk(m, m->private);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332) DEFINE_SHOW_ATTRIBUTE(ptdump);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334) static int ptdump_init(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 335) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 336) 	unsigned int i, j;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 337) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 338) 	for (i = 0; i < ARRAY_SIZE(pg_level); i++)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 339) 		for (j = 0; j < ARRAY_SIZE(pte_bits); j++)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 340) 			pg_level[i].mask |= pte_bits[j].mask;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 341) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 342) 	debugfs_create_file("kernel_page_tables", 0400, NULL, &kernel_ptd_info,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 343) 			    &ptdump_fops);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 344) #ifdef CONFIG_EFI
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 345) 	if (efi_enabled(EFI_RUNTIME_SERVICES))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 346) 		debugfs_create_file("efi_page_tables", 0400, NULL, &efi_ptd_info,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 347) 				    &ptdump_fops);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 348) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 349) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 350) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 351) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 352) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 353) device_initcall(ptdump_init);