arch/x86/mm/dump_pagetables.c

   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  */
  30 struct 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
  43 struct 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
  53 enum address_markers_idx {
  54         USER_SPACE_NR = 0,
  55         KERNEL_SPACE_NR,
  56         LOW_KERNEL_NR,
  57 #if defined(CONFIG_MODIFY_LDT_SYSCALL) && defined(CONFIG_X86_5LEVEL)
  58         LDT_NR,
  59 #endif
  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 #if defined(CONFIG_MODIFY_LDT_SYSCALL) && !defined(CONFIG_X86_5LEVEL)
  68         LDT_NR,
  69 #endif
  70 #ifdef CONFIG_X86_ESPFIX64
  71         ESPFIX_START_NR,
  72 #endif
  73 #ifdef CONFIG_EFI
  74         EFI_END_NR,
  75 #endif
  76         HIGH_KERNEL_NR,
  77         MODULES_VADDR_NR,
  78         MODULES_END_NR,
  79         FIXADDR_START_NR,
  80         END_OF_SPACE_NR,
  81 };
  82
  83 static struct addr_marker address_markers[] = {
  84         [USER_SPACE_NR]         = { 0,                  "User Space" },
  85         [KERNEL_SPACE_NR]       = { (1UL << 63),        "Kernel Space" },
  86         [LOW_KERNEL_NR]         = { 0UL,                "Low Kernel Mapping" },
  87         [VMALLOC_START_NR]      = { 0UL,                "vmalloc() Area" },
  88         [VMEMMAP_START_NR]      = { 0UL,                "Vmemmap" },
  89 #ifdef CONFIG_KASAN
  90         /*
  91          * These fields get initialized with the (dynamic)
  92          * KASAN_SHADOW_{START,END} values in pt_dump_init().
  93          */
  94         [KASAN_SHADOW_START_NR] = { 0UL,                "KASAN shadow" },
  95         [KASAN_SHADOW_END_NR]   = { 0UL,                "KASAN shadow end" },
  96 #endif
  97 #ifdef CONFIG_MODIFY_LDT_SYSCALL
  98         [LDT_NR]                = { 0UL,                "LDT remap" },
  99 #endif
 100         [CPU_ENTRY_AREA_NR]     = { CPU_ENTRY_AREA_BASE,"CPU entry Area" },
 101 #ifdef CONFIG_X86_ESPFIX64
 102         [ESPFIX_START_NR]       = { ESPFIX_BASE_ADDR,   "ESPfix Area", 16 },
 103 #endif
 104 #ifdef CONFIG_EFI
 105         [EFI_END_NR]            = { EFI_VA_END,         "EFI Runtime Services" },
 106 #endif
 107         [HIGH_KERNEL_NR]        = { __START_KERNEL_map, "High Kernel Mapping" },
 108         [MODULES_VADDR_NR]      = { MODULES_VADDR,      "Modules" },
 109         [MODULES_END_NR]        = { MODULES_END,        "End Modules" },
 110         [FIXADDR_START_NR]      = { FIXADDR_START,      "Fixmap Area" },
 111         [END_OF_SPACE_NR]       = { -1,                 NULL }
 112 };
 113
 114 #else /* CONFIG_X86_64 */
 115
 116 enum address_markers_idx {
 117         USER_SPACE_NR = 0,
 118         KERNEL_SPACE_NR,
 119         VMALLOC_START_NR,
 120         VMALLOC_END_NR,
 121 #ifdef CONFIG_HIGHMEM
 122         PKMAP_BASE_NR,
 123 #endif
 124         CPU_ENTRY_AREA_NR,
 125         FIXADDR_START_NR,
 126         END_OF_SPACE_NR,
 127 };
 128
 129 static 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         [CPU_ENTRY_AREA_NR]     = { 0UL,                "CPU entry area" },
 138         [FIXADDR_START_NR]      = { 0UL,                "Fixmap area" },
 139         [END_OF_SPACE_NR]       = { -1,                 NULL }
 140 };
 141
 142 #endif /* !CONFIG_X86_64 */
 143
 144 /* Multipliers for offsets within the PTEs */
 145 #define PTE_LEVEL_MULT (PAGE_SIZE)
 146 #define PMD_LEVEL_MULT (PTRS_PER_PTE * PTE_LEVEL_MULT)
 147 #define PUD_LEVEL_MULT (PTRS_PER_PMD * PMD_LEVEL_MULT)
 148 #define P4D_LEVEL_MULT (PTRS_PER_PUD * PUD_LEVEL_MULT)
 149 #define PGD_LEVEL_MULT (PTRS_PER_P4D * P4D_LEVEL_MULT)
 150
 151 #define pt_dump_seq_printf(m, to_dmesg, fmt, args...)           \
 152 ({                                                              \
 153         if (to_dmesg)                                   \
 154                 printk(KERN_INFO fmt, ##args);                  \
 155         else                                                    \
 156                 if (m)                                          \
 157                         seq_printf(m, fmt, ##args);             \
 158 })
 159
 160 #define pt_dump_cont_printf(m, to_dmesg, fmt, args...)          \
 161 ({                                                              \
 162         if (to_dmesg)                                   \
 163                 printk(KERN_CONT fmt, ##args);                  \
 164         else                                                    \
 165                 if (m)                                          \
 166                         seq_printf(m, fmt, ##args);             \
 167 })
 168
 169 /*
 170  * Print a readable form of a pgprot_t to the seq_file
 171  */
 172 static void printk_prot(struct seq_file *m, pgprot_t prot, int level, bool dmsg)
 173 {
 174         pgprotval_t pr = pgprot_val(prot);
 175         static const char * const level_name[] =
 176                 { "cr3", "pgd", "p4d", "pud", "pmd", "pte" };
 177
 178         if (!(pr & _PAGE_PRESENT)) {
 179                 /* Not present */
 180                 pt_dump_cont_printf(m, dmsg, "                              ");
 181         } else {
 182                 if (pr & _PAGE_USER)
 183                         pt_dump_cont_printf(m, dmsg, "USR ");
 184                 else
 185                         pt_dump_cont_printf(m, dmsg, "    ");
 186                 if (pr & _PAGE_RW)
 187                         pt_dump_cont_printf(m, dmsg, "RW ");
 188                 else
 189                         pt_dump_cont_printf(m, dmsg, "ro ");
 190                 if (pr & _PAGE_PWT)
 191                         pt_dump_cont_printf(m, dmsg, "PWT ");
 192                 else
 193                         pt_dump_cont_printf(m, dmsg, "    ");
 194                 if (pr & _PAGE_PCD)
 195                         pt_dump_cont_printf(m, dmsg, "PCD ");
 196                 else
 197                         pt_dump_cont_printf(m, dmsg, "    ");
 198
 199                 /* Bit 7 has a different meaning on level 3 vs 4 */
 200                 if (level <= 4 && pr & _PAGE_PSE)
 201                         pt_dump_cont_printf(m, dmsg, "PSE ");
 202                 else
 203                         pt_dump_cont_printf(m, dmsg, "    ");
 204                 if ((level == 5 && pr & _PAGE_PAT) ||
 205                     ((level == 4 || level == 3) && pr & _PAGE_PAT_LARGE))
 206                         pt_dump_cont_printf(m, dmsg, "PAT ");
 207                 else
 208                         pt_dump_cont_printf(m, dmsg, "    ");
 209                 if (pr & _PAGE_GLOBAL)
 210                         pt_dump_cont_printf(m, dmsg, "GLB ");
 211                 else
 212                         pt_dump_cont_printf(m, dmsg, "    ");
 213                 if (pr & _PAGE_NX)
 214                         pt_dump_cont_printf(m, dmsg, "NX ");
 215                 else
 216                         pt_dump_cont_printf(m, dmsg, "x  ");
 217         }
 218         pt_dump_cont_printf(m, dmsg, "%s\n", level_name[level]);
 219 }
 220
 221 /*
 222  * On 64 bits, sign-extend the 48 bit address to 64 bit
 223  */
 224 static unsigned long normalize_addr(unsigned long u)
 225 {
 226         int shift;
 227         if (!IS_ENABLED(CONFIG_X86_64))
 228                 return u;
 229
 230         shift = 64 - (__VIRTUAL_MASK_SHIFT + 1);
 231         return (signed long)(u << shift) >> shift;
 232 }
 233
 234 /*
 235  * This function gets called on a break in a continuous series
 236  * of PTE entries; the next one is different so we need to
 237  * print what we collected so far.
 238  */
 239 static void note_page(struct seq_file *m, struct pg_state *st,
 240                       pgprot_t new_prot, pgprotval_t new_eff, int level)
 241 {
 242         pgprotval_t prot, cur, eff;
 243         static const char units[] = "BKMGTPE";
 244
 245         /*
 246          * If we have a "break" in the series, we need to flush the state that
 247          * we have now. "break" is either changing perms, levels or
 248          * address space marker.
 249          */
 250         prot = pgprot_val(new_prot);
 251         cur = pgprot_val(st->current_prot);
 252         eff = st->effective_prot;
 253
 254         if (!st->level) {
 255                 /* First entry */
 256                 st->current_prot = new_prot;
 257                 st->effective_prot = new_eff;
 258                 st->level = level;
 259                 st->marker = address_markers;
 260                 st->lines = 0;
 261                 pt_dump_seq_printf(m, st->to_dmesg, "---[ %s ]---\n",
 262                                    st->marker->name);
 263         } else if (prot != cur || new_eff != eff || level != st->level ||
 264                    st->current_address >= st->marker[1].start_address) {
 265                 const char *unit = units;
 266                 unsigned long delta;
 267                 int width = sizeof(unsigned long) * 2;
 268
 269                 if (st->check_wx && (eff & _PAGE_RW) && !(eff & _PAGE_NX)) {
 270                         WARN_ONCE(1,
 271                                   "x86/mm: Found insecure W+X mapping at address %p/%pS\n",
 272                                   (void *)st->start_address,
 273                                   (void *)st->start_address);
 274                         st->wx_pages += (st->current_address -
 275                                          st->start_address) / PAGE_SIZE;
 276                 }
 277
 278                 /*
 279                  * Now print the actual finished series
 280                  */
 281                 if (!st->marker->max_lines ||
 282                     st->lines < st->marker->max_lines) {
 283                         pt_dump_seq_printf(m, st->to_dmesg,
 284                                            "0x%0*lx-0x%0*lx   ",
 285                                            width, st->start_address,
 286                                            width, st->current_address);
 287
 288                         delta = st->current_address - st->start_address;
 289                         while (!(delta & 1023) && unit[1]) {
 290                                 delta >>= 10;
 291                                 unit++;
 292                         }
 293                         pt_dump_cont_printf(m, st->to_dmesg, "%9lu%c ",
 294                                             delta, *unit);
 295                         printk_prot(m, st->current_prot, st->level,
 296                                     st->to_dmesg);
 297                 }
 298                 st->lines++;
 299
 300                 /*
 301                  * We print markers for special areas of address space,
 302                  * such as the start of vmalloc space etc.
 303                  * This helps in the interpretation.
 304                  */
 305                 if (st->current_address >= st->marker[1].start_address) {
 306                         if (st->marker->max_lines &&
 307                             st->lines > st->marker->max_lines) {
 308                                 unsigned long nskip =
 309                                         st->lines - st->marker->max_lines;
 310                                 pt_dump_seq_printf(m, st->to_dmesg,
 311                                                    "... %lu entr%s skipped ... \n",
 312                                                    nskip,
 313                                                    nskip == 1 ? "y" : "ies");
 314                         }
 315                         st->marker++;
 316                         st->lines = 0;
 317                         pt_dump_seq_printf(m, st->to_dmesg, "---[ %s ]---\n",
 318                                            st->marker->name);
 319                 }
 320
 321                 st->start_address = st->current_address;
 322                 st->current_prot = new_prot;
 323                 st->effective_prot = new_eff;
 324                 st->level = level;
 325         }
 326 }
 327
 328 static inline pgprotval_t effective_prot(pgprotval_t prot1, pgprotval_t prot2)
 329 {
 330         return (prot1 & prot2 & (_PAGE_USER | _PAGE_RW)) |
 331                ((prot1 | prot2) & _PAGE_NX);
 332 }
 333
 334 static void walk_pte_level(struct seq_file *m, struct pg_state *st, pmd_t addr,
 335                            pgprotval_t eff_in, unsigned long P)
 336 {
 337         int i;
 338         pte_t *pte;
 339         pgprotval_t prot, eff;
 340
 341         for (i = 0; i < PTRS_PER_PTE; i++) {
 342                 st->current_address = normalize_addr(P + i * PTE_LEVEL_MULT);
 343                 pte = pte_offset_map(&addr, st->current_address);
 344                 prot = pte_flags(*pte);
 345                 eff = effective_prot(eff_in, prot);
 346                 note_page(m, st, __pgprot(prot), eff, 5);
 347                 pte_unmap(pte);
 348         }
 349 }
 350 #ifdef CONFIG_KASAN
 351
 352 /*
 353  * This is an optimization for KASAN=y case. Since all kasan page tables
 354  * eventually point to the kasan_zero_page we could call note_page()
 355  * right away without walking through lower level page tables. This saves
 356  * us dozens of seconds (minutes for 5-level config) while checking for
 357  * W+X mapping or reading kernel_page_tables debugfs file.
 358  */
 359 static inline bool kasan_page_table(struct seq_file *m, struct pg_state *st,
 360                                 void *pt)
 361 {
 362         if (__pa(pt) == __pa(kasan_zero_pmd) ||
 363             (pgtable_l5_enabled() && __pa(pt) == __pa(kasan_zero_p4d)) ||
 364             __pa(pt) == __pa(kasan_zero_pud)) {
 365                 pgprotval_t prot = pte_flags(kasan_zero_pte[0]);
 366                 note_page(m, st, __pgprot(prot), 0, 5);
 367                 return true;
 368         }
 369         return false;
 370 }
 371 #else
 372 static inline bool kasan_page_table(struct seq_file *m, struct pg_state *st,
 373                                 void *pt)
 374 {
 375         return false;
 376 }
 377 #endif
 378
 379 #if PTRS_PER_PMD > 1
 380
 381 static void walk_pmd_level(struct seq_file *m, struct pg_state *st, pud_t addr,
 382                            pgprotval_t eff_in, unsigned long P)
 383 {
 384         int i;
 385         pmd_t *start, *pmd_start;
 386         pgprotval_t prot, eff;
 387
 388         pmd_start = start = (pmd_t *)pud_page_vaddr(addr);
 389         for (i = 0; i < PTRS_PER_PMD; i++) {
 390                 st->current_address = normalize_addr(P + i * PMD_LEVEL_MULT);
 391                 if (!pmd_none(*start)) {
 392                         prot = pmd_flags(*start);
 393                         eff = effective_prot(eff_in, prot);
 394                         if (pmd_large(*start) || !pmd_present(*start)) {
 395                                 note_page(m, st, __pgprot(prot), eff, 4);
 396                         } else if (!kasan_page_table(m, st, pmd_start)) {
 397                                 walk_pte_level(m, st, *start, eff,
 398                                                P + i * PMD_LEVEL_MULT);
 399                         }
 400                 } else
 401                         note_page(m, st, __pgprot(0), 0, 4);
 402                 start++;
 403         }
 404 }
 405
 406 #else
 407 #define walk_pmd_level(m,s,a,e,p) walk_pte_level(m,s,__pmd(pud_val(a)),e,p)
 408 #define pud_large(a) pmd_large(__pmd(pud_val(a)))
 409 #define pud_none(a)  pmd_none(__pmd(pud_val(a)))
 410 #endif
 411
 412 #if PTRS_PER_PUD > 1
 413
 414 static void walk_pud_level(struct seq_file *m, struct pg_state *st, p4d_t addr,
 415                            pgprotval_t eff_in, unsigned long P)
 416 {
 417         int i;
 418         pud_t *start, *pud_start;
 419         pgprotval_t prot, eff;
 420         pud_t *prev_pud = NULL;
 421
 422         pud_start = start = (pud_t *)p4d_page_vaddr(addr);
 423
 424         for (i = 0; i < PTRS_PER_PUD; i++) {
 425                 st->current_address = normalize_addr(P + i * PUD_LEVEL_MULT);
 426                 if (!pud_none(*start)) {
 427                         prot = pud_flags(*start);
 428                         eff = effective_prot(eff_in, prot);
 429                         if (pud_large(*start) || !pud_present(*start)) {
 430                                 note_page(m, st, __pgprot(prot), eff, 3);
 431                         } else if (!kasan_page_table(m, st, pud_start)) {
 432                                 walk_pmd_level(m, st, *start, eff,
 433                                                P + i * PUD_LEVEL_MULT);
 434                         }
 435                 } else
 436                         note_page(m, st, __pgprot(0), 0, 3);
 437
 438                 prev_pud = start;
 439                 start++;
 440         }
 441 }
 442
 443 #else
 444 #define walk_pud_level(m,s,a,e,p) walk_pmd_level(m,s,__pud(p4d_val(a)),e,p)
 445 #define p4d_large(a) pud_large(__pud(p4d_val(a)))
 446 #define p4d_none(a)  pud_none(__pud(p4d_val(a)))
 447 #endif
 448
 449 static void walk_p4d_level(struct seq_file *m, struct pg_state *st, pgd_t addr,
 450                            pgprotval_t eff_in, unsigned long P)
 451 {
 452         int i;
 453         p4d_t *start, *p4d_start;
 454         pgprotval_t prot, eff;
 455
 456         if (PTRS_PER_P4D == 1)
 457                 return walk_pud_level(m, st, __p4d(pgd_val(addr)), eff_in, P);
 458
 459         p4d_start = start = (p4d_t *)pgd_page_vaddr(addr);
 460
 461         for (i = 0; i < PTRS_PER_P4D; i++) {
 462                 st->current_address = normalize_addr(P + i * P4D_LEVEL_MULT);
 463                 if (!p4d_none(*start)) {
 464                         prot = p4d_flags(*start);
 465                         eff = effective_prot(eff_in, prot);
 466                         if (p4d_large(*start) || !p4d_present(*start)) {
 467                                 note_page(m, st, __pgprot(prot), eff, 2);
 468                         } else if (!kasan_page_table(m, st, p4d_start)) {
 469                                 walk_pud_level(m, st, *start, eff,
 470                                                P + i * P4D_LEVEL_MULT);
 471                         }
 472                 } else
 473                         note_page(m, st, __pgprot(0), 0, 2);
 474
 475                 start++;
 476         }
 477 }
 478
 479 #define pgd_large(a) (pgtable_l5_enabled() ? pgd_large(a) : p4d_large(__p4d(pgd_val(a))))
 480 #define pgd_none(a)  (pgtable_l5_enabled() ? pgd_none(a) : p4d_none(__p4d(pgd_val(a))))
 481
 482 static inline bool is_hypervisor_range(int idx)
 483 {
 484 #ifdef CONFIG_X86_64
 485         /*
 486          * ffff800000000000 - ffff87ffffffffff is reserved for
 487          * the hypervisor.
 488          */
 489         return  (idx >= pgd_index(__PAGE_OFFSET) - 16) &&
 490                 (idx <  pgd_index(__PAGE_OFFSET));
 491 #else
 492         return false;
 493 #endif
 494 }
 495
 496 static void ptdump_walk_pgd_level_core(struct seq_file *m, pgd_t *pgd,
 497                                        bool checkwx, bool dmesg)
 498 {
 499 #ifdef CONFIG_X86_64
 500         pgd_t *start = (pgd_t *) &init_top_pgt;
 501 #else
 502         pgd_t *start = swapper_pg_dir;
 503 #endif
 504         pgprotval_t prot, eff;
 505         int i;
 506         struct pg_state st = {};
 507
 508         if (pgd) {
 509                 start = pgd;
 510                 st.to_dmesg = dmesg;
 511         }
 512
 513         st.check_wx = checkwx;
 514         if (checkwx)
 515                 st.wx_pages = 0;
 516
 517         for (i = 0; i < PTRS_PER_PGD; i++) {
 518                 st.current_address = normalize_addr(i * PGD_LEVEL_MULT);
 519                 if (!pgd_none(*start) && !is_hypervisor_range(i)) {
 520                         prot = pgd_flags(*start);
 521 #ifdef CONFIG_X86_PAE
 522                         eff = _PAGE_USER | _PAGE_RW;
 523 #else
 524                         eff = prot;
 525 #endif
 526                         if (pgd_large(*start) || !pgd_present(*start)) {
 527                                 note_page(m, &st, __pgprot(prot), eff, 1);
 528                         } else {
 529                                 walk_p4d_level(m, &st, *start, eff,
 530                                                i * PGD_LEVEL_MULT);
 531                         }
 532                 } else
 533                         note_page(m, &st, __pgprot(0), 0, 1);
 534
 535                 cond_resched();
 536                 start++;
 537         }
 538
 539         /* Flush out the last page */
 540         st.current_address = normalize_addr(PTRS_PER_PGD*PGD_LEVEL_MULT);
 541         note_page(m, &st, __pgprot(0), 0, 0);
 542         if (!checkwx)
 543                 return;
 544         if (st.wx_pages)
 545                 pr_info("x86/mm: Checked W+X mappings: FAILED, %lu W+X pages found.\n",
 546                         st.wx_pages);
 547         else
 548                 pr_info("x86/mm: Checked W+X mappings: passed, no W+X pages found.\n");
 549 }
 550
 551 void ptdump_walk_pgd_level(struct seq_file *m, pgd_t *pgd)
 552 {
 553         ptdump_walk_pgd_level_core(m, pgd, false, true);
 554 }
 555
 556 void ptdump_walk_pgd_level_debugfs(struct seq_file *m, pgd_t *pgd, bool user)
 557 {
 558 #ifdef CONFIG_PAGE_TABLE_ISOLATION
 559         if (user && static_cpu_has(X86_FEATURE_PTI))
 560                 pgd = kernel_to_user_pgdp(pgd);
 561 #endif
 562         ptdump_walk_pgd_level_core(m, pgd, false, false);
 563 }
 564 EXPORT_SYMBOL_GPL(ptdump_walk_pgd_level_debugfs);
 565
 566 static void ptdump_walk_user_pgd_level_checkwx(void)
 567 {
 568 #ifdef CONFIG_PAGE_TABLE_ISOLATION
 569         pgd_t *pgd = (pgd_t *) &init_top_pgt;
 570
 571         if (!static_cpu_has(X86_FEATURE_PTI))
 572                 return;
 573
 574         pr_info("x86/mm: Checking user space page tables\n");
 575         pgd = kernel_to_user_pgdp(pgd);
 576         ptdump_walk_pgd_level_core(NULL, pgd, true, false);
 577 #endif
 578 }
 579
 580 void ptdump_walk_pgd_level_checkwx(void)
 581 {
 582         ptdump_walk_pgd_level_core(NULL, NULL, true, false);
 583         ptdump_walk_user_pgd_level_checkwx();
 584 }
 585
 586 static int __init pt_dump_init(void)
 587 {
 588         /*
 589          * Various markers are not compile-time constants, so assign them
 590          * here.
 591          */
 592 #ifdef CONFIG_X86_64
 593         address_markers[LOW_KERNEL_NR].start_address = PAGE_OFFSET;
 594         address_markers[VMALLOC_START_NR].start_address = VMALLOC_START;
 595         address_markers[VMEMMAP_START_NR].start_address = VMEMMAP_START;
 596 #ifdef CONFIG_MODIFY_LDT_SYSCALL
 597         address_markers[LDT_NR].start_address = LDT_BASE_ADDR;
 598 #endif
 599 #ifdef CONFIG_KASAN
 600         address_markers[KASAN_SHADOW_START_NR].start_address = KASAN_SHADOW_START;
 601         address_markers[KASAN_SHADOW_END_NR].start_address = KASAN_SHADOW_END;
 602 #endif
 603 #endif
 604 #ifdef CONFIG_X86_32
 605         address_markers[VMALLOC_START_NR].start_address = VMALLOC_START;
 606         address_markers[VMALLOC_END_NR].start_address = VMALLOC_END;
 607 # ifdef CONFIG_HIGHMEM
 608         address_markers[PKMAP_BASE_NR].start_address = PKMAP_BASE;
 609 # endif
 610         address_markers[FIXADDR_START_NR].start_address = FIXADDR_START;
 611         address_markers[CPU_ENTRY_AREA_NR].start_address = CPU_ENTRY_AREA_BASE;
 612 #endif
 613         return 0;
 614 }
 615 __initcall(pt_dump_init);