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
  22 #include <asm/pgtable.h>
  23
  24 /*
  25  * The dumper groups pagetable entries of the same type into one, and for
  26  * that it needs to keep some state when walking, and flush this state
  27  * when a "break" in the continuity is found.
  28  */
  29 struct pg_state {
  30         int level;
  31         pgprot_t current_prot;
  32         pgprotval_t effective_prot;
  33         unsigned long start_address;
  34         unsigned long current_address;
  35         const struct addr_marker *marker;
  36         unsigned long lines;
  37         bool to_dmesg;
  38         bool check_wx;
  39         unsigned long wx_pages;
  40 };
  41
  42 struct addr_marker {
  43         unsigned long start_address;
  44         const char *name;
  45         unsigned long max_lines;
  46 };
  47
  48 /* Address space markers hints */
  49
  50 #ifdef CONFIG_X86_64
  51
  52 enum address_markers_idx {
  53         USER_SPACE_NR = 0,
  54         KERNEL_SPACE_NR,
  55         LOW_KERNEL_NR,
  56 #if defined(CONFIG_MODIFY_LDT_SYSCALL) && defined(CONFIG_X86_5LEVEL)
  57         LDT_NR,
  58 #endif
  59         VMALLOC_START_NR,
  60         VMEMMAP_START_NR,
  61 #ifdef CONFIG_KASAN
  62         KASAN_SHADOW_START_NR,
  63         KASAN_SHADOW_END_NR,
  64 #endif
  65         CPU_ENTRY_AREA_NR,
  66 #if defined(CONFIG_MODIFY_LDT_SYSCALL) && !defined(CONFIG_X86_5LEVEL)
  67         LDT_NR,
  68 #endif
  69 #ifdef CONFIG_X86_ESPFIX64
  70         ESPFIX_START_NR,
  71 #endif
  72 #ifdef CONFIG_EFI
  73         EFI_END_NR,
  74 #endif
  75         HIGH_KERNEL_NR,
  76         MODULES_VADDR_NR,
  77         MODULES_END_NR,
  78         FIXADDR_START_NR,
  79         END_OF_SPACE_NR,
  80 };
  81
  82 static struct addr_marker address_markers[] = {
  83         [USER_SPACE_NR]         = { 0,                  "User Space" },
  84         [KERNEL_SPACE_NR]       = { (1UL << 63),        "Kernel Space" },
  85         [LOW_KERNEL_NR]         = { 0UL,                "Low Kernel Mapping" },
  86         [VMALLOC_START_NR]      = { 0UL,                "vmalloc() Area" },
  87         [VMEMMAP_START_NR]      = { 0UL,                "Vmemmap" },
  88 #ifdef CONFIG_KASAN
  89         /*
  90          * These fields get initialized with the (dynamic)
  91          * KASAN_SHADOW_{START,END} values in pt_dump_init().
  92          */
  93         [KASAN_SHADOW_START_NR] = { 0UL,                "KASAN shadow" },
  94         [KASAN_SHADOW_END_NR]   = { 0UL,                "KASAN shadow end" },
  95 #endif
  96 #ifdef CONFIG_MODIFY_LDT_SYSCALL
  97         [LDT_NR]                = { 0UL,                "LDT remap" },
  98 #endif
  99         [CPU_ENTRY_AREA_NR]     = { CPU_ENTRY_AREA_BASE,"CPU entry Area" },
 100 #ifdef CONFIG_X86_ESPFIX64
 101         [ESPFIX_START_NR]       = { ESPFIX_BASE_ADDR,   "ESPfix Area", 16 },
 102 #endif
 103 #ifdef CONFIG_EFI
 104         [EFI_END_NR]            = { EFI_VA_END,         "EFI Runtime Services" },
 105 #endif
 106         [HIGH_KERNEL_NR]        = { __START_KERNEL_map, "High Kernel Mapping" },
 107         [MODULES_VADDR_NR]      = { MODULES_VADDR,      "Modules" },
 108         [MODULES_END_NR]        = { MODULES_END,        "End Modules" },
 109         [FIXADDR_START_NR]      = { FIXADDR_START,      "Fixmap Area" },
 110         [END_OF_SPACE_NR]       = { -1,                 NULL }
 111 };
 112
 113 #else /* CONFIG_X86_64 */
 114
 115 enum address_markers_idx {
 116         USER_SPACE_NR = 0,
 117         KERNEL_SPACE_NR,
 118         VMALLOC_START_NR,
 119         VMALLOC_END_NR,
 120 #ifdef CONFIG_HIGHMEM
 121         PKMAP_BASE_NR,
 122 #endif
 123         CPU_ENTRY_AREA_NR,
 124         FIXADDR_START_NR,
 125         END_OF_SPACE_NR,
 126 };
 127
 128 static struct addr_marker address_markers[] = {
 129         [USER_SPACE_NR]         = { 0,                  "User Space" },
 130         [KERNEL_SPACE_NR]       = { PAGE_OFFSET,        "Kernel Mapping" },
 131         [VMALLOC_START_NR]      = { 0UL,                "vmalloc() Area" },
 132         [VMALLOC_END_NR]        = { 0UL,                "vmalloc() End" },
 133 #ifdef CONFIG_HIGHMEM
 134         [PKMAP_BASE_NR]         = { 0UL,                "Persistent kmap() Area" },
 135 #endif
 136         [CPU_ENTRY_AREA_NR]     = { 0UL,                "CPU entry area" },
 137         [FIXADDR_START_NR]      = { 0UL,                "Fixmap area" },
 138         [END_OF_SPACE_NR]       = { -1,                 NULL }
 139 };
 140
 141 #endif /* !CONFIG_X86_64 */
 142
 143 /* Multipliers for offsets within the PTEs */
 144 #define PTE_LEVEL_MULT (PAGE_SIZE)
 145 #define PMD_LEVEL_MULT (PTRS_PER_PTE * PTE_LEVEL_MULT)
 146 #define PUD_LEVEL_MULT (PTRS_PER_PMD * PMD_LEVEL_MULT)
 147 #define P4D_LEVEL_MULT (PTRS_PER_PUD * PUD_LEVEL_MULT)
 148 #define PGD_LEVEL_MULT (PTRS_PER_P4D * P4D_LEVEL_MULT)
 149
 150 #define pt_dump_seq_printf(m, to_dmesg, fmt, args...)           \
 151 ({                                                              \
 152         if (to_dmesg)                                   \
 153                 printk(KERN_INFO fmt, ##args);                  \
 154         else                                                    \
 155                 if (m)                                          \
 156                         seq_printf(m, fmt, ##args);             \
 157 })
 158
 159 #define pt_dump_cont_printf(m, to_dmesg, fmt, args...)          \
 160 ({                                                              \
 161         if (to_dmesg)                                   \
 162                 printk(KERN_CONT fmt, ##args);                  \
 163         else                                                    \
 164                 if (m)                                          \
 165                         seq_printf(m, fmt, ##args);             \
 166 })
 167
 168 /*
 169  * Print a readable form of a pgprot_t to the seq_file
 170  */
 171 static void printk_prot(struct seq_file *m, pgprot_t prot, int level, bool dmsg)
 172 {
 173         pgprotval_t pr = pgprot_val(prot);
 174         static const char * const level_name[] =
 175                 { "cr3", "pgd", "p4d", "pud", "pmd", "pte" };
 176
 177         if (!(pr & _PAGE_PRESENT)) {
 178                 /* Not present */
 179                 pt_dump_cont_printf(m, dmsg, "                              ");
 180         } else {
 181                 if (pr & _PAGE_USER)
 182                         pt_dump_cont_printf(m, dmsg, "USR ");
 183                 else
 184                         pt_dump_cont_printf(m, dmsg, "    ");
 185                 if (pr & _PAGE_RW)
 186                         pt_dump_cont_printf(m, dmsg, "RW ");
 187                 else
 188                         pt_dump_cont_printf(m, dmsg, "ro ");
 189                 if (pr & _PAGE_PWT)
 190                         pt_dump_cont_printf(m, dmsg, "PWT ");
 191                 else
 192                         pt_dump_cont_printf(m, dmsg, "    ");
 193                 if (pr & _PAGE_PCD)
 194                         pt_dump_cont_printf(m, dmsg, "PCD ");
 195                 else
 196                         pt_dump_cont_printf(m, dmsg, "    ");
 197
 198                 /* Bit 7 has a different meaning on level 3 vs 4 */
 199                 if (level <= 4 && pr & _PAGE_PSE)
 200                         pt_dump_cont_printf(m, dmsg, "PSE ");
 201                 else
 202                         pt_dump_cont_printf(m, dmsg, "    ");
 203                 if ((level == 5 && pr & _PAGE_PAT) ||
 204                     ((level == 4 || level == 3) && pr & _PAGE_PAT_LARGE))
 205                         pt_dump_cont_printf(m, dmsg, "PAT ");
 206                 else
 207                         pt_dump_cont_printf(m, dmsg, "    ");
 208                 if (pr & _PAGE_GLOBAL)
 209                         pt_dump_cont_printf(m, dmsg, "GLB ");
 210                 else
 211                         pt_dump_cont_printf(m, dmsg, "    ");
 212                 if (pr & _PAGE_NX)
 213                         pt_dump_cont_printf(m, dmsg, "NX ");
 214                 else
 215                         pt_dump_cont_printf(m, dmsg, "x  ");
 216         }
 217         pt_dump_cont_printf(m, dmsg, "%s\n", level_name[level]);
 218 }
 219
 220 /*
 221  * On 64 bits, sign-extend the 48 bit address to 64 bit
 222  */
 223 static unsigned long normalize_addr(unsigned long u)
 224 {
 225         int shift;
 226         if (!IS_ENABLED(CONFIG_X86_64))
 227                 return u;
 228
 229         shift = 64 - (__VIRTUAL_MASK_SHIFT + 1);
 230         return (signed long)(u << shift) >> shift;
 231 }
 232
 233 /*
 234  * This function gets called on a break in a continuous series
 235  * of PTE entries; the next one is different so we need to
 236  * print what we collected so far.
 237  */
 238 static void note_page(struct seq_file *m, struct pg_state *st,
 239                       pgprot_t new_prot, pgprotval_t new_eff, int level)
 240 {
 241         pgprotval_t prot, cur, eff;
 242         static const char units[] = "BKMGTPE";
 243
 244         /*
 245          * If we have a "break" in the series, we need to flush the state that
 246          * we have now. "break" is either changing perms, levels or
 247          * address space marker.
 248          */
 249         prot = pgprot_val(new_prot);
 250         cur = pgprot_val(st->current_prot);
 251         eff = st->effective_prot;
 252
 253         if (!st->level) {
 254                 /* First entry */
 255                 st->current_prot = new_prot;
 256                 st->effective_prot = new_eff;
 257                 st->level = level;
 258                 st->marker = address_markers;
 259                 st->lines = 0;
 260                 pt_dump_seq_printf(m, st->to_dmesg, "---[ %s ]---\n",
 261                                    st->marker->name);
 262         } else if (prot != cur || new_eff != eff || level != st->level ||
 263                    st->current_address >= st->marker[1].start_address) {
 264                 const char *unit = units;
 265                 unsigned long delta;
 266                 int width = sizeof(unsigned long) * 2;
 267
 268                 if (st->check_wx && (eff & _PAGE_RW) && !(eff & _PAGE_NX)) {
 269                         WARN_ONCE(1,
 270                                   "x86/mm: Found insecure W+X mapping at address %p/%pS\n",
 271                                   (void *)st->start_address,
 272                                   (void *)st->start_address);
 273                         st->wx_pages += (st->current_address -
 274                                          st->start_address) / PAGE_SIZE;
 275                 }
 276
 277                 /*
 278                  * Now print the actual finished series
 279                  */
 280                 if (!st->marker->max_lines ||
 281                     st->lines < st->marker->max_lines) {
 282                         pt_dump_seq_printf(m, st->to_dmesg,
 283                                            "0x%0*lx-0x%0*lx   ",
 284                                            width, st->start_address,
 285                                            width, st->current_address);
 286
 287                         delta = st->current_address - st->start_address;
 288                         while (!(delta & 1023) && unit[1]) {
 289                                 delta >>= 10;
 290                                 unit++;
 291                         }
 292                         pt_dump_cont_printf(m, st->to_dmesg, "%9lu%c ",
 293                                             delta, *unit);
 294                         printk_prot(m, st->current_prot, st->level,
 295                                     st->to_dmesg);
 296                 }
 297                 st->lines++;
 298
 299                 /*
 300                  * We print markers for special areas of address space,
 301                  * such as the start of vmalloc space etc.
 302                  * This helps in the interpretation.
 303                  */
 304                 if (st->current_address >= st->marker[1].start_address) {
 305                         if (st->marker->max_lines &&
 306                             st->lines > st->marker->max_lines) {
 307                                 unsigned long nskip =
 308                                         st->lines - st->marker->max_lines;
 309                                 pt_dump_seq_printf(m, st->to_dmesg,
 310                                                    "... %lu entr%s skipped ... \n",
 311                                                    nskip,
 312                                                    nskip == 1 ? "y" : "ies");
 313                         }
 314                         st->marker++;
 315                         st->lines = 0;
 316                         pt_dump_seq_printf(m, st->to_dmesg, "---[ %s ]---\n",
 317                                            st->marker->name);
 318                 }
 319
 320                 st->start_address = st->current_address;
 321                 st->current_prot = new_prot;
 322                 st->effective_prot = new_eff;
 323                 st->level = level;
 324         }
 325 }
 326
 327 static inline pgprotval_t effective_prot(pgprotval_t prot1, pgprotval_t prot2)
 328 {
 329         return (prot1 & prot2 & (_PAGE_USER | _PAGE_RW)) |
 330                ((prot1 | prot2) & _PAGE_NX);
 331 }
 332
 333 static void walk_pte_level(struct seq_file *m, struct pg_state *st, pmd_t addr,
 334                            pgprotval_t eff_in, unsigned long P)
 335 {
 336         int i;
 337         pte_t *start;
 338         pgprotval_t prot, eff;
 339
 340         start = (pte_t *)pmd_page_vaddr(addr);
 341         for (i = 0; i < PTRS_PER_PTE; i++) {
 342                 prot = pte_flags(*start);
 343                 eff = effective_prot(eff_in, prot);
 344                 st->current_address = normalize_addr(P + i * PTE_LEVEL_MULT);
 345                 note_page(m, st, __pgprot(prot), eff, 5);
 346                 start++;
 347         }
 348 }
 349 #ifdef CONFIG_KASAN
 350
 351 /*
 352  * This is an optimization for KASAN=y case. Since all kasan page tables
 353  * eventually point to the kasan_zero_page we could call note_page()
 354  * right away without walking through lower level page tables. This saves
 355  * us dozens of seconds (minutes for 5-level config) while checking for
 356  * W+X mapping or reading kernel_page_tables debugfs file.
 357  */
 358 static inline bool kasan_page_table(struct seq_file *m, struct pg_state *st,
 359                                 void *pt)
 360 {
 361         if (__pa(pt) == __pa(kasan_zero_pmd) ||
 362             (pgtable_l5_enabled && __pa(pt) == __pa(kasan_zero_p4d)) ||
 363             __pa(pt) == __pa(kasan_zero_pud)) {
 364                 pgprotval_t prot = pte_flags(kasan_zero_pte[0]);
 365                 note_page(m, st, __pgprot(prot), 0, 5);
 366                 return true;
 367         }
 368         return false;
 369 }
 370 #else
 371 static inline bool kasan_page_table(struct seq_file *m, struct pg_state *st,
 372                                 void *pt)
 373 {
 374         return false;
 375 }
 376 #endif
 377
 378 #if PTRS_PER_PMD > 1
 379
 380 static void walk_pmd_level(struct seq_file *m, struct pg_state *st, pud_t addr,
 381                            pgprotval_t eff_in, unsigned long P)
 382 {
 383         int i;
 384         pmd_t *start, *pmd_start;
 385         pgprotval_t prot, eff;
 386
 387         pmd_start = start = (pmd_t *)pud_page_vaddr(addr);
 388         for (i = 0; i < PTRS_PER_PMD; i++) {
 389                 st->current_address = normalize_addr(P + i * PMD_LEVEL_MULT);
 390                 if (!pmd_none(*start)) {
 391                         prot = pmd_flags(*start);
 392                         eff = effective_prot(eff_in, prot);
 393                         if (pmd_large(*start) || !pmd_present(*start)) {
 394                                 note_page(m, st, __pgprot(prot), eff, 4);
 395                         } else if (!kasan_page_table(m, st, pmd_start)) {
 396                                 walk_pte_level(m, st, *start, eff,
 397                                                P + i * PMD_LEVEL_MULT);
 398                         }
 399                 } else
 400                         note_page(m, st, __pgprot(0), 0, 4);
 401                 start++;
 402         }
 403 }
 404
 405 #else
 406 #define walk_pmd_level(m,s,a,e,p) walk_pte_level(m,s,__pmd(pud_val(a)),e,p)
 407 #define pud_large(a) pmd_large(__pmd(pud_val(a)))
 408 #define pud_none(a)  pmd_none(__pmd(pud_val(a)))
 409 #endif
 410
 411 #if PTRS_PER_PUD > 1
 412
 413 static void walk_pud_level(struct seq_file *m, struct pg_state *st, p4d_t addr,
 414                            pgprotval_t eff_in, unsigned long P)
 415 {
 416         int i;
 417         pud_t *start, *pud_start;
 418         pgprotval_t prot, eff;
 419         pud_t *prev_pud = NULL;
 420
 421         pud_start = start = (pud_t *)p4d_page_vaddr(addr);
 422
 423         for (i = 0; i < PTRS_PER_PUD; i++) {
 424                 st->current_address = normalize_addr(P + i * PUD_LEVEL_MULT);
 425                 if (!pud_none(*start)) {
 426                         prot = pud_flags(*start);
 427                         eff = effective_prot(eff_in, prot);
 428                         if (pud_large(*start) || !pud_present(*start)) {
 429                                 note_page(m, st, __pgprot(prot), eff, 3);
 430                         } else if (!kasan_page_table(m, st, pud_start)) {
 431                                 walk_pmd_level(m, st, *start, eff,
 432                                                P + i * PUD_LEVEL_MULT);
 433                         }
 434                 } else
 435                         note_page(m, st, __pgprot(0), 0, 3);
 436
 437                 prev_pud = start;
 438                 start++;
 439         }
 440 }
 441
 442 #else
 443 #define walk_pud_level(m,s,a,e,p) walk_pmd_level(m,s,__pud(p4d_val(a)),e,p)
 444 #define p4d_large(a) pud_large(__pud(p4d_val(a)))
 445 #define p4d_none(a)  pud_none(__pud(p4d_val(a)))
 446 #endif
 447
 448 static void walk_p4d_level(struct seq_file *m, struct pg_state *st, pgd_t addr,
 449                            pgprotval_t eff_in, unsigned long P)
 450 {
 451         int i;
 452         p4d_t *start, *p4d_start;
 453         pgprotval_t prot, eff;
 454
 455         if (PTRS_PER_P4D == 1)
 456                 return walk_pud_level(m, st, __p4d(pgd_val(addr)), eff_in, P);
 457
 458         p4d_start = start = (p4d_t *)pgd_page_vaddr(addr);
 459
 460         for (i = 0; i < PTRS_PER_P4D; i++) {
 461                 st->current_address = normalize_addr(P + i * P4D_LEVEL_MULT);
 462                 if (!p4d_none(*start)) {
 463                         prot = p4d_flags(*start);
 464                         eff = effective_prot(eff_in, prot);
 465                         if (p4d_large(*start) || !p4d_present(*start)) {
 466                                 note_page(m, st, __pgprot(prot), eff, 2);
 467                         } else if (!kasan_page_table(m, st, p4d_start)) {
 468                                 walk_pud_level(m, st, *start, eff,
 469                                                P + i * P4D_LEVEL_MULT);
 470                         }
 471                 } else
 472                         note_page(m, st, __pgprot(0), 0, 2);
 473
 474                 start++;
 475         }
 476 }
 477
 478 #define pgd_large(a) (pgtable_l5_enabled ? pgd_large(a) : p4d_large(__p4d(pgd_val(a))))
 479 #define pgd_none(a)  (pgtable_l5_enabled ? pgd_none(a) : p4d_none(__p4d(pgd_val(a))))
 480
 481 static inline bool is_hypervisor_range(int idx)
 482 {
 483 #ifdef CONFIG_X86_64
 484         /*
 485          * ffff800000000000 - ffff87ffffffffff is reserved for
 486          * the hypervisor.
 487          */
 488         return  (idx >= pgd_index(__PAGE_OFFSET) - 16) &&
 489                 (idx <  pgd_index(__PAGE_OFFSET));
 490 #else
 491         return false;
 492 #endif
 493 }
 494
 495 static void ptdump_walk_pgd_level_core(struct seq_file *m, pgd_t *pgd,
 496                                        bool checkwx, bool dmesg)
 497 {
 498 #ifdef CONFIG_X86_64
 499         pgd_t *start = (pgd_t *) &init_top_pgt;
 500 #else
 501         pgd_t *start = swapper_pg_dir;
 502 #endif
 503         pgprotval_t prot, eff;
 504         int i;
 505         struct pg_state st = {};
 506
 507         if (pgd) {
 508                 start = pgd;
 509                 st.to_dmesg = dmesg;
 510         }
 511
 512         st.check_wx = checkwx;
 513         if (checkwx)
 514                 st.wx_pages = 0;
 515
 516         for (i = 0; i < PTRS_PER_PGD; i++) {
 517                 st.current_address = normalize_addr(i * PGD_LEVEL_MULT);
 518                 if (!pgd_none(*start) && !is_hypervisor_range(i)) {
 519                         prot = pgd_flags(*start);
 520 #ifdef CONFIG_X86_PAE
 521                         eff = _PAGE_USER | _PAGE_RW;
 522 #else
 523                         eff = prot;
 524 #endif
 525                         if (pgd_large(*start) || !pgd_present(*start)) {
 526                                 note_page(m, &st, __pgprot(prot), eff, 1);
 527                         } else {
 528                                 walk_p4d_level(m, &st, *start, eff,
 529                                                i * PGD_LEVEL_MULT);
 530                         }
 531                 } else
 532                         note_page(m, &st, __pgprot(0), 0, 1);
 533
 534                 cond_resched();
 535                 start++;
 536         }
 537
 538         /* Flush out the last page */
 539         st.current_address = normalize_addr(PTRS_PER_PGD*PGD_LEVEL_MULT);
 540         note_page(m, &st, __pgprot(0), 0, 0);
 541         if (!checkwx)
 542                 return;
 543         if (st.wx_pages)
 544                 pr_info("x86/mm: Checked W+X mappings: FAILED, %lu W+X pages found.\n",
 545                         st.wx_pages);
 546         else
 547                 pr_info("x86/mm: Checked W+X mappings: passed, no W+X pages found.\n");
 548 }
 549
 550 void ptdump_walk_pgd_level(struct seq_file *m, pgd_t *pgd)
 551 {
 552         ptdump_walk_pgd_level_core(m, pgd, false, true);
 553 }
 554
 555 void ptdump_walk_pgd_level_debugfs(struct seq_file *m, pgd_t *pgd, bool user)
 556 {
 557 #ifdef CONFIG_PAGE_TABLE_ISOLATION
 558         if (user && static_cpu_has(X86_FEATURE_PTI))
 559                 pgd = kernel_to_user_pgdp(pgd);
 560 #endif
 561         ptdump_walk_pgd_level_core(m, pgd, false, false);
 562 }
 563 EXPORT_SYMBOL_GPL(ptdump_walk_pgd_level_debugfs);
 564
 565 static void ptdump_walk_user_pgd_level_checkwx(void)
 566 {
 567 #ifdef CONFIG_PAGE_TABLE_ISOLATION
 568         pgd_t *pgd = (pgd_t *) &init_top_pgt;
 569
 570         if (!static_cpu_has(X86_FEATURE_PTI))
 571                 return;
 572
 573         pr_info("x86/mm: Checking user space page tables\n");
 574         pgd = kernel_to_user_pgdp(pgd);
 575         ptdump_walk_pgd_level_core(NULL, pgd, true, false);
 576 #endif
 577 }
 578
 579 void ptdump_walk_pgd_level_checkwx(void)
 580 {
 581         ptdump_walk_pgd_level_core(NULL, NULL, true, false);
 582         ptdump_walk_user_pgd_level_checkwx();
 583 }
 584
 585 static int __init pt_dump_init(void)
 586 {
 587         /*
 588          * Various markers are not compile-time constants, so assign them
 589          * here.
 590          */
 591 #ifdef CONFIG_X86_64
 592         address_markers[LOW_KERNEL_NR].start_address = PAGE_OFFSET;
 593         address_markers[VMALLOC_START_NR].start_address = VMALLOC_START;
 594         address_markers[VMEMMAP_START_NR].start_address = VMEMMAP_START;
 595 #ifdef CONFIG_MODIFY_LDT_SYSCALL
 596         address_markers[LDT_NR].start_address = LDT_BASE_ADDR;
 597 #endif
 598 #ifdef CONFIG_KASAN
 599         address_markers[KASAN_SHADOW_START_NR].start_address = KASAN_SHADOW_START;
 600         address_markers[KASAN_SHADOW_END_NR].start_address = KASAN_SHADOW_END;
 601 #endif
 602 #endif
 603 #ifdef CONFIG_X86_32
 604         address_markers[VMALLOC_START_NR].start_address = VMALLOC_START;
 605         address_markers[VMALLOC_END_NR].start_address = VMALLOC_END;
 606 # ifdef CONFIG_HIGHMEM
 607         address_markers[PKMAP_BASE_NR].start_address = PKMAP_BASE;
 608 # endif
 609         address_markers[FIXADDR_START_NR].start_address = FIXADDR_START;
 610         address_markers[CPU_ENTRY_AREA_NR].start_address = CPU_ENTRY_AREA_BASE;
 611 #endif
 612         return 0;
 613 }
 614 __initcall(pt_dump_init);