LXR linux/arch/x86/mm/dump

   1/*
   2 * Debug helper to dump the current kernel pagetables of the system
   3 * so that we can see what the various memory ranges are set to.
   4 *
   5 * (C) Copyright 2008 Intel Corporation
   6 *
   7 * Author: Arjan van de Ven <arjan@linux.intel.com>
   8 *
   9 * This program is free software; you can redistribute it and/or
  10 * modify it under the terms of the GNU General Public License
  11 * as published by the Free Software Foundation; version 2
  12 * of the License.
  13 */
  14
  15#include <linux/debugfs.h>
  16#include <linux/kasan.h>
  17#include <linux/mm.h>
  18#include <linux/init.h>
  19#include <linux/sched.h>
  20#include <linux/seq_file.h>
  21#include <linux/highmem.h>
  22
  23#include <asm/pgtable.h>
  24
  25/*
  26 * The dumper groups pagetable entries of the same type into one, and for
  27 * that it needs to keep some state when walking, and flush this state
  28 * when a "break" in the continuity is found.
  29 */
  30struct pg_state {
  31        int level;
  32        pgprot_t current_prot;
  33        pgprotval_t effective_prot;
  34        unsigned long start_address;
  35        unsigned long current_address;
  36        const struct addr_marker *marker;
  37        unsigned long lines;
  38        bool to_dmesg;
  39        bool check_wx;
  40        unsigned long wx_pages;
  41};
  42
  43struct addr_marker {
  44        unsigned long start_address;
  45        const char *name;
  46        unsigned long max_lines;
  47};
  48
  49/* Address space markers hints */
  50
  51#ifdef CONFIG_X86_64
  52
  53enum address_markers_idx {
  54        USER_SPACE_NR = 0,
  55        KERNEL_SPACE_NR,
  56#ifdef CONFIG_MODIFY_LDT_SYSCALL
  57        LDT_NR,
  58#endif
  59        LOW_KERNEL_NR,
  60        VMALLOC_START_NR,
  61        VMEMMAP_START_NR,
  62#ifdef CONFIG_KASAN
  63        KASAN_SHADOW_START_NR,
  64        KASAN_SHADOW_END_NR,
  65#endif
  66        CPU_ENTRY_AREA_NR,
  67#ifdef CONFIG_X86_ESPFIX64
  68        ESPFIX_START_NR,
  69#endif
  70#ifdef CONFIG_EFI
  71        EFI_END_NR,
  72#endif
  73        HIGH_KERNEL_NR,
  74        MODULES_VADDR_NR,
  75        MODULES_END_NR,
  76        FIXADDR_START_NR,
  77        END_OF_SPACE_NR,
  78};
  79
  80static struct addr_marker address_markers[] = {
  81        [USER_SPACE_NR]         = { 0,                  "User Space" },
  82        [KERNEL_SPACE_NR]       = { (1UL << 63),        "Kernel Space" },
  83        [LOW_KERNEL_NR]         = { 0UL,                "Low Kernel Mapping" },
  84        [VMALLOC_START_NR]      = { 0UL,                "vmalloc() Area" },
  85        [VMEMMAP_START_NR]      = { 0UL,                "Vmemmap" },
  86#ifdef CONFIG_KASAN
  87        /*
  88         * These fields get initialized with the (dynamic)
  89         * KASAN_SHADOW_{START,END} values in pt_dump_init().
  90         */
  91        [KASAN_SHADOW_START_NR] = { 0UL,                "KASAN shadow" },
  92        [KASAN_SHADOW_END_NR]   = { 0UL,                "KASAN shadow end" },
  93#endif
  94#ifdef CONFIG_MODIFY_LDT_SYSCALL
  95        [LDT_NR]                = { 0UL,                "LDT remap" },
  96#endif
  97        [CPU_ENTRY_AREA_NR]     = { CPU_ENTRY_AREA_BASE,"CPU entry Area" },
  98#ifdef CONFIG_X86_ESPFIX64
  99        [ESPFIX_START_NR]       = { ESPFIX_BASE_ADDR,   "ESPfix Area", 16 },
 100#endif
 101#ifdef CONFIG_EFI
 102        [EFI_END_NR]            = { EFI_VA_END,         "EFI Runtime Services" },
 103#endif
 104        [HIGH_KERNEL_NR]        = { __START_KERNEL_map, "High Kernel Mapping" },
 105        [MODULES_VADDR_NR]      = { MODULES_VADDR,      "Modules" },
 106        [MODULES_END_NR]        = { MODULES_END,        "End Modules" },
 107        [FIXADDR_START_NR]      = { FIXADDR_START,      "Fixmap Area" },
 108        [END_OF_SPACE_NR]       = { -1,                 NULL }
 109};
 110
 111#else /* CONFIG_X86_64 */
 112
 113enum address_markers_idx {
 114        USER_SPACE_NR = 0,
 115        KERNEL_SPACE_NR,
 116        VMALLOC_START_NR,
 117        VMALLOC_END_NR,
 118#ifdef CONFIG_HIGHMEM
 119        PKMAP_BASE_NR,
 120#endif
 121#ifdef CONFIG_MODIFY_LDT_SYSCALL
 122        LDT_NR,
 123#endif
 124        CPU_ENTRY_AREA_NR,
 125        FIXADDR_START_NR,
 126        END_OF_SPACE_NR,
 127};
 128
 129static struct addr_marker address_markers[] = {
 130        [USER_SPACE_NR]         = { 0,                  "User Space" },
 131        [KERNEL_SPACE_NR]       = { PAGE_OFFSET,        "Kernel Mapping" },
 132        [VMALLOC_START_NR]      = { 0UL,                "vmalloc() Area" },
 133        [VMALLOC_END_NR]        = { 0UL,                "vmalloc() End" },
 134#ifdef CONFIG_HIGHMEM
 135        [PKMAP_BASE_NR]         = { 0UL,                "Persistent kmap() Area" },
 136#endif
 137#ifdef CONFIG_MODIFY_LDT_SYSCALL
 138        [LDT_NR]                = { 0UL,                "LDT remap" },
 139#endif
 140        [CPU_ENTRY_AREA_NR]     = { 0UL,                "CPU entry area" },
 141        [FIXADDR_START_NR]      = { 0UL,                "Fixmap area" },
 142        [END_OF_SPACE_NR]       = { -1,                 NULL }
 143};
 144
 145#endif /* !CONFIG_X86_64 */
 146
 147/* Multipliers for offsets within the PTEs */
 148#define PTE_LEVEL_MULT (PAGE_SIZE)
 149#define PMD_LEVEL_MULT (PTRS_PER_PTE * PTE_LEVEL_MULT)
 150#define PUD_LEVEL_MULT (PTRS_PER_PMD * PMD_LEVEL_MULT)
 151#define P4D_LEVEL_MULT (PTRS_PER_PUD * PUD_LEVEL_MULT)
 152#define PGD_LEVEL_MULT (PTRS_PER_P4D * P4D_LEVEL_MULT)
 153
 154#define pt_dump_seq_printf(m, to_dmesg, fmt, args...)           \
 155({                                                              \
 156        if (to_dmesg)                                   \
 157                printk(KERN_INFO fmt, ##args);                  \
 158        else                                                    \
 159                if (m)                                          \
 160                        seq_printf(m, fmt, ##args);             \
 161})
 162
 163#define pt_dump_cont_printf(m, to_dmesg, fmt, args...)          \
 164({                                                              \
 165        if (to_dmesg)                                   \
 166                printk(KERN_CONT fmt, ##args);                  \
 167        else                                                    \
 168                if (m)                                          \
 169                        seq_printf(m, fmt, ##args);             \
 170})
 171
 172/*
 173 * Print a readable form of a pgprot_t to the seq_file
 174 */
 175static void printk_prot(struct seq_file *m, pgprot_t prot, int level, bool dmsg)
 176{
 177        pgprotval_t pr = pgprot_val(prot);
 178        static const char * const level_name[] =
 179                { "cr3", "pgd", "p4d", "pud", "pmd", "pte" };
 180
 181        if (!(pr & _PAGE_PRESENT)) {
 182                /* Not present */
 183                pt_dump_cont_printf(m, dmsg, "                              ");
 184        } else {
 185                if (pr & _PAGE_USER)
 186                        pt_dump_cont_printf(m, dmsg, "USR ");
 187                else
 188                        pt_dump_cont_printf(m, dmsg, "    ");
 189                if (pr & _PAGE_RW)
 190                        pt_dump_cont_printf(m, dmsg, "RW ");
 191                else
 192                        pt_dump_cont_printf(m, dmsg, "ro ");
 193                if (pr & _PAGE_PWT)
 194                        pt_dump_cont_printf(m, dmsg, "PWT ");
 195                else
 196                        pt_dump_cont_printf(m, dmsg, "    ");
 197                if (pr & _PAGE_PCD)
 198                        pt_dump_cont_printf(m, dmsg, "PCD ");
 199                else
 200                        pt_dump_cont_printf(m, dmsg, "    ");
 201
 202                /* Bit 7 has a different meaning on level 3 vs 4 */
 203                if (level <= 4 && pr & _PAGE_PSE)
 204                        pt_dump_cont_printf(m, dmsg, "PSE ");
 205                else
 206                        pt_dump_cont_printf(m, dmsg, "    ");
 207                if ((level == 5 && pr & _PAGE_PAT) ||
 208                    ((level == 4 || level == 3) && pr & _PAGE_PAT_LARGE))
 209                        pt_dump_cont_printf(m, dmsg, "PAT ");
 210                else
 211                        pt_dump_cont_printf(m, dmsg, "    ");
 212                if (pr & _PAGE_GLOBAL)
 213                        pt_dump_cont_printf(m, dmsg, "GLB ");
 214                else
 215                        pt_dump_cont_printf(m, dmsg, "    ");
 216                if (pr & _PAGE_NX)
 217                        pt_dump_cont_printf(m, dmsg, "NX ");
 218                else
 219                        pt_dump_cont_printf(m, dmsg, "x  ");
 220        }
 221        pt_dump_cont_printf(m, dmsg, "%s\n", level_name[level]);
 222}
 223
 224/*
 225 * On 64 bits, sign-extend the 48 bit address to 64 bit
 226 */
 227static unsigned long normalize_addr(unsigned long u)
 228{
 229        int shift;
 230        if (!IS_ENABLED(CONFIG_X86_64))
 231                return u;
 232
 233        shift = 64 - (__VIRTUAL_MASK_SHIFT + 1);
 234        return (signed long)(u << shift) >> shift;
 235}
 236
 237/*
 238 * This function gets called on a break in a continuous series
 239 * of PTE entries; the next one is different so we need to
 240 * print what we collected so far.
 241 */
 242static void note_page(struct seq_file *m, struct pg_state *st,
 243                      pgprot_t new_prot, pgprotval_t new_eff, int level)
 244{
 245        pgprotval_t prot, cur, eff;
 246        static const char units[] = "BKMGTPE";
 247
 248        /*
 249         * If we have a "break" in the series, we need to flush the state that
 250         * we have now. "break" is either changing perms, levels or
 251         * address space marker.
 252         */
 253        prot = pgprot_val(new_prot);
 254        cur = pgprot_val(st->current_prot);
 255        eff = st->effective_prot;
 256
 257        if (!st->level) {
 258                /* First entry */
 259                st->current_prot = new_prot;
 260                st->effective_prot = new_eff;
 261                st->level = level;
 262                st->marker = address_markers;
 263                st->lines = 0;
 264                pt_dump_seq_printf(m, st->to_dmesg, "---[ %s ]---\n",
 265                                   st->marker->name);
 266        } else if (prot != cur || new_eff != eff || level != st->level ||
 267                   st->current_address >= st->marker[1].start_address) {
 268                const char *unit = units;
 269                unsigned long delta;
 270                int width = sizeof(unsigned long) * 2;
 271
 272                if (st->check_wx && (eff & _PAGE_RW) && !(eff & _PAGE_NX)) {
 273                        WARN_ONCE(1,
 274                                  "x86/mm: Found insecure W+X mapping at address %p/%pS\n",
 275                                  (void *)st->start_address,
 276                                  (void *)st->start_address);
 277                        st->wx_pages += (st->current_address -
 278                                         st->start_address) / PAGE_SIZE;
 279                }
 280
 281                /*
 282                 * Now print the actual finished series
 283                 */
 284                if (!st->marker->max_lines ||
 285                    st->lines < st->marker->max_lines) {
 286                        pt_dump_seq_printf(m, st->to_dmesg,
 287                                           "0x%0*lx-0x%0*lx   ",
 288                                           width, st->start_address,
 289                                           width, st->current_address);
 290
 291                        delta = st->current_address - st->start_address;
 292                        while (!(delta & 1023) && unit[1]) {
 293                                delta >>= 10;
 294                                unit++;
 295                        }
 296                        pt_dump_cont_printf(m, st->to_dmesg, "%9lu%c ",
 297                                            delta, *unit);
 298                        printk_prot(m, st->current_prot, st->level,
 299                                    st->to_dmesg);
 300                }
 301                st->lines++;
 302
 303                /*
 304                 * We print markers for special areas of address space,
 305                 * such as the start of vmalloc space etc.
 306                 * This helps in the interpretation.
 307                 */
 308                if (st->current_address >= st->marker[1].start_address) {
 309                        if (st->marker->max_lines &&
 310                            st->lines > st->marker->max_lines) {
 311                                unsigned long nskip =
 312                                        st->lines - st->marker->max_lines;
 313                                pt_dump_seq_printf(m, st->to_dmesg,
 314                                                   "... %lu entr%s skipped ... \n",
 315                                                   nskip,
 316                                                   nskip == 1 ? "y" : "ies");
 317                        }
 318                        st->marker++;
 319                        st->lines = 0;
 320                        pt_dump_seq_printf(m, st->to_dmesg, "---[ %s ]---\n",
 321                                           st->marker->name);
 322                }
 323
 324                st->start_address = st->current_address;
 325                st->current_prot = new_prot;
 326                st->effective_prot = new_eff;
 327                st->level = level;
 328        }
 329}
 330
 331static inline pgprotval_t effective_prot(pgprotval_t prot1, pgprotval_t prot2)
 332{
 333        return (prot1 & prot2 & (_PAGE_USER | _PAGE_RW)) |
 334               ((prot1 | prot2) & _PAGE_NX);
 335}
 336
 337static void walk_pte_level(struct seq_file *m, struct pg_state *st, pmd_t addr,
 338                           pgprotval_t eff_in, unsigned long P)
 339{
 340        int i;
 341        pte_t *pte;
 342        pgprotval_t prot, eff;
 343
 344        for (i = 0; i < PTRS_PER_PTE; i++) {
 345                st->current_address = normalize_addr(P + i * PTE_LEVEL_MULT);
 346                pte = pte_offset_map(&addr, st->current_address);
 347                prot = pte_flags(*pte);
 348                eff = effective_prot(eff_in, prot);
 349                note_page(m, st, __pgprot(prot), eff, 5);
 350                pte_unmap(pte);
 351        }
 352}
 353#ifdef CONFIG_KASAN
 354
 355/*
 356 * This is an optimization for KASAN=y case. Since all kasan page tables
 357 * eventually point to the kasan_early_shadow_page we could call note_page()
 358 * right away without walking through lower level page tables. This saves
 359 * us dozens of seconds (minutes for 5-level config) while checking for
 360 * W+X mapping or reading kernel_page_tables debugfs file.
 361 */
 362static inline bool kasan_page_table(struct seq_file *m, struct pg_state *st,
 363                                void *pt)
 364{
 365        if (__pa(pt) == __pa(kasan_early_shadow_pmd) ||
 366            (pgtable_l5_enabled() &&
 367                        __pa(pt) == __pa(kasan_early_shadow_p4d)) ||
 368            __pa(pt) == __pa(kasan_early_shadow_pud)) {
 369                pgprotval_t prot = pte_flags(kasan_early_shadow_pte[0]);
 370                note_page(m, st, __pgprot(prot), 0, 5);
 371                return true;
 372        }
 373        return false;
 374}
 375#else
 376static inline bool kasan_page_table(struct seq_file *m, struct pg_state *st,
 377                                void *pt)
 378{
 379        return false;
 380}
 381#endif
 382
 383#if PTRS_PER_PMD > 1
 384
 385static void walk_pmd_level(struct seq_file *m, struct pg_state *st, pud_t addr,
 386                           pgprotval_t eff_in, unsigned long P)
 387{
 388        int i;
 389        pmd_t *start, *pmd_start;
 390        pgprotval_t prot, eff;
 391
 392        pmd_start = start = (pmd_t *)pud_page_vaddr(addr);
 393        for (i = 0; i < PTRS_PER_PMD; i++) {
 394                st->current_address = normalize_addr(P + i * PMD_LEVEL_MULT);
 395                if (!pmd_none(*start)) {
 396                        prot = pmd_flags(*start);
 397                        eff = effective_prot(eff_in, prot);
 398                        if (pmd_large(*start) || !pmd_present(*start)) {
 399                                note_page(m, st, __pgprot(prot), eff, 4);
 400                        } else if (!kasan_page_table(m, st, pmd_start)) {
 401                                walk_pte_level(m, st, *start, eff,
 402                                               P + i * PMD_LEVEL_MULT);
 403                        }
 404                } else
 405                        note_page(m, st, __pgprot(0), 0, 4);
 406                start++;
 407        }
 408}
 409
 410#else
 411#define walk_pmd_level(m,s,a,e,p) walk_pte_level(m,s,__pmd(pud_val(a)),e,p)
 412#define pud_large(a) pmd_large(__pmd(pud_val(a)))
 413#define pud_none(a)  pmd_none(__pmd(pud_val(a)))
 414#endif
 415
 416#if PTRS_PER_PUD > 1
 417
 418static void walk_pud_level(struct seq_file *m, struct pg_state *st, p4d_t addr,
 419                           pgprotval_t eff_in, unsigned long P)
 420{
 421        int i;
 422        pud_t *start, *pud_start;
 423        pgprotval_t prot, eff;
 424        pud_t *prev_pud = NULL;
 425
 426        pud_start = start = (pud_t *)p4d_page_vaddr(addr);
 427
 428        for (i = 0; i < PTRS_PER_PUD; i++) {
 429                st->current_address = normalize_addr(P + i * PUD_LEVEL_MULT);
 430                if (!pud_none(*start)) {
 431                        prot = pud_flags(*start);
 432                        eff = effective_prot(eff_in, prot);
 433                        if (pud_large(*start) || !pud_present(*start)) {
 434                                note_page(m, st, __pgprot(prot), eff, 3);
 435                        } else if (!kasan_page_table(m, st, pud_start)) {
 436                                walk_pmd_level(m, st, *start, eff,
 437                                               P + i * PUD_LEVEL_MULT);
 438                        }
 439                } else
 440                        note_page(m, st, __pgprot(0), 0, 3);
 441
 442                prev_pud = start;
 443                start++;
 444        }
 445}
 446
 447#else
 448#define walk_pud_level(m,s,a,e,p) walk_pmd_level(m,s,__pud(p4d_val(a)),e,p)
 449#define p4d_large(a) pud_large(__pud(p4d_val(a)))
 450#define p4d_none(a)  pud_none(__pud(p4d_val(a)))
 451#endif
 452
 453static void walk_p4d_level(struct seq_file *m, struct pg_state *st, pgd_t addr,
 454                           pgprotval_t eff_in, unsigned long P)
 455{
 456        int i;
 457        p4d_t *start, *p4d_start;
 458        pgprotval_t prot, eff;
 459
 460        if (PTRS_PER_P4D == 1)
 461                return walk_pud_level(m, st, __p4d(pgd_val(addr)), eff_in, P);
 462
 463        p4d_start = start = (p4d_t *)pgd_page_vaddr(addr);
 464
 465        for (i = 0; i < PTRS_PER_P4D; i++) {
 466                st->current_address = normalize_addr(P + i * P4D_LEVEL_MULT);
 467                if (!p4d_none(*start)) {
 468                        prot = p4d_flags(*start);
 469                        eff = effective_prot(eff_in, prot);
 470                        if (p4d_large(*start) || !p4d_present(*start)) {
 471                                note_page(m, st, __pgprot(prot), eff, 2);
 472                        } else if (!kasan_page_table(m, st, p4d_start)) {
 473                                walk_pud_level(m, st, *start, eff,
 474                                               P + i * P4D_LEVEL_MULT);
 475                        }
 476                } else
 477                        note_page(m, st, __pgprot(0), 0, 2);
 478
 479                start++;
 480        }
 481}
 482
 483#define pgd_large(a) (pgtable_l5_enabled() ? pgd_large(a) : p4d_large(__p4d(pgd_val(a))))
 484#define pgd_none(a)  (pgtable_l5_enabled() ? pgd_none(a) : p4d_none(__p4d(pgd_val(a))))
 485
 486static inline bool is_hypervisor_range(int idx)
 487{
 488#ifdef CONFIG_X86_64
 489        /*
 490         * A hole in the beginning of kernel address space reserved
 491         * for a hypervisor.
 492         */
 493        return  (idx >= pgd_index(GUARD_HOLE_BASE_ADDR)) &&
 494                (idx <  pgd_index(GUARD_HOLE_END_ADDR));
 495#else
 496        return false;
 497#endif
 498}
 499
 500static void ptdump_walk_pgd_level_core(struct seq_file *m, pgd_t *pgd,
 501                                       bool checkwx, bool dmesg)
 502{
 503#ifdef CONFIG_X86_64
 504        pgd_t *start = (pgd_t *) &init_top_pgt;
 505#else
 506        pgd_t *start = swapper_pg_dir;
 507#endif
 508        pgprotval_t prot, eff;
 509        int i;
 510        struct pg_state st = {};
 511
 512        if (pgd) {
 513                start = pgd;
 514                st.to_dmesg = dmesg;
 515        }
 516
 517        st.check_wx = checkwx;
 518        if (checkwx)
 519                st.wx_pages = 0;
 520
 521        for (i = 0; i < PTRS_PER_PGD; i++) {
 522                st.current_address = normalize_addr(i * PGD_LEVEL_MULT);
 523                if (!pgd_none(*start) && !is_hypervisor_range(i)) {
 524                        prot = pgd_flags(*start);
 525#ifdef CONFIG_X86_PAE
 526                        eff = _PAGE_USER | _PAGE_RW;
 527#else
 528                        eff = prot;
 529#endif
 530                        if (pgd_large(*start) || !pgd_present(*start)) {
 531                                note_page(m, &st, __pgprot(prot), eff, 1);
 532                        } else {
 533                                walk_p4d_level(m, &st, *start, eff,
 534                                               i * PGD_LEVEL_MULT);
 535                        }
 536                } else
 537                        note_page(m, &st, __pgprot(0), 0, 1);
 538
 539                cond_resched();
 540                start++;
 541        }
 542
 543        /* Flush out the last page */
 544        st.current_address = normalize_addr(PTRS_PER_PGD*PGD_LEVEL_MULT);
 545        note_page(m, &st, __pgprot(0), 0, 0);
 546        if (!checkwx)
 547                return;
 548        if (st.wx_pages)
 549                pr_info("x86/mm: Checked W+X mappings: FAILED, %lu W+X pages found.\n",
 550                        st.wx_pages);
 551        else
 552                pr_info("x86/mm: Checked W+X mappings: passed, no W+X pages found.\n");
 553}
 554
 555void ptdump_walk_pgd_level(struct seq_file *m, pgd_t *pgd)
 556{
 557        ptdump_walk_pgd_level_core(m, pgd, false, true);
 558}
 559
 560void ptdump_walk_pgd_level_debugfs(struct seq_file *m, pgd_t *pgd, bool user)
 561{
 562#ifdef CONFIG_PAGE_TABLE_ISOLATION
 563        if (user && static_cpu_has(X86_FEATURE_PTI))
 564                pgd = kernel_to_user_pgdp(pgd);
 565#endif
 566        ptdump_walk_pgd_level_core(m, pgd, false, false);
 567}
 568EXPORT_SYMBOL_GPL(ptdump_walk_pgd_level_debugfs);
 569
 570static void ptdump_walk_user_pgd_level_checkwx(void)
 571{
 572#ifdef CONFIG_PAGE_TABLE_ISOLATION
 573        pgd_t *pgd = (pgd_t *) &init_top_pgt;
 574
 575        if (!static_cpu_has(X86_FEATURE_PTI))
 576                return;
 577
 578        pr_info("x86/mm: Checking user space page tables\n");
 579        pgd = kernel_to_user_pgdp(pgd);
 580        ptdump_walk_pgd_level_core(NULL, pgd, true, false);
 581#endif
 582}
 583
 584void ptdump_walk_pgd_level_checkwx(void)
 585{
 586        ptdump_walk_pgd_level_core(NULL, NULL, true, false);
 587        ptdump_walk_user_pgd_level_checkwx();
 588}
 589
 590static int __init pt_dump_init(void)
 591{
 592        /*
 593         * Various markers are not compile-time constants, so assign them
 594         * here.
 595         */
 596#ifdef CONFIG_X86_64
 597        address_markers[LOW_KERNEL_NR].start_address = PAGE_OFFSET;
 598        address_markers[VMALLOC_START_NR].start_address = VMALLOC_START;
 599        address_markers[VMEMMAP_START_NR].start_address = VMEMMAP_START;
 600#ifdef CONFIG_MODIFY_LDT_SYSCALL
 601        address_markers[LDT_NR].start_address = LDT_BASE_ADDR;
 602#endif
 603#ifdef CONFIG_KASAN
 604        address_markers[KASAN_SHADOW_START_NR].start_address = KASAN_SHADOW_START;
 605        address_markers[KASAN_SHADOW_END_NR].start_address = KASAN_SHADOW_END;
 606#endif
 607#endif
 608#ifdef CONFIG_X86_32
 609        address_markers[VMALLOC_START_NR].start_address = VMALLOC_START;
 610        address_markers[VMALLOC_END_NR].start_address = VMALLOC_END;
 611# ifdef CONFIG_HIGHMEM
 612        address_markers[PKMAP_BASE_NR].start_address = PKMAP_BASE;
 613# endif
 614        address_markers[FIXADDR_START_NR].start_address = FIXADDR_START;
 615        address_markers[CPU_ENTRY_AREA_NR].start_address = CPU_ENTRY_AREA_BASE;
 616# ifdef CONFIG_MODIFY_LDT_SYSCALL
 617        address_markers[LDT_NR].start_address = LDT_BASE_ADDR;
 618# endif
 619#endif
 620        return 0;
 621}
 622__initcall(pt_dump_init);
 623