crypto/mem_sec.c

   1 /*
   2  * Copyright 2015-2020 The OpenSSL Project Authors. All Rights Reserved.
   3  * Copyright 2004-2014, Akamai Technologies. All Rights Reserved.
   4  *
   5  * Licensed under the Apache License 2.0 (the "License").  You may not use
   6  * this file except in compliance with the License.  You can obtain a copy
   7  * in the file LICENSE in the source distribution or at
   8  * https://www.openssl.org/source/license.html
   9  */
  10
  11 /*
  12  * This file is in two halves. The first half implements the public API
  13  * to be used by external consumers, and to be used by OpenSSL to store
  14  * data in a "secure arena." The second half implements the secure arena.
  15  * For details on that implementation, see below (look for uppercase
  16  * "SECURE HEAP IMPLEMENTATION").
  17  */
  18 #include "e_os.h"
  19 #include <openssl/crypto.h>
  20
  21 #include <string.h>
  22
  23 #ifndef OPENSSL_NO_SECURE_MEMORY
  24 # include <stdlib.h>
  25 # include <assert.h>
  26 # include <unistd.h>
  27 # include <sys/types.h>
  28 # include <sys/mman.h>
  29 # if defined(OPENSSL_SYS_LINUX)
  30 #  include <sys/syscall.h>
  31 #  if defined(SYS_mlock2)
  32 #   include <linux/mman.h>
  33 #   include <errno.h>
  34 #  endif
  35 #  include <sys/param.h>
  36 # endif
  37 # include <sys/stat.h>
  38 # include <fcntl.h>
  39 #endif
  40
  41 #define CLEAR(p, s) OPENSSL_cleanse(p, s)
  42 #ifndef PAGE_SIZE
  43 # define PAGE_SIZE    4096
  44 #endif
  45 #if !defined(MAP_ANON) && defined(MAP_ANONYMOUS)
  46 # define MAP_ANON MAP_ANONYMOUS
  47 #endif
  48
  49 #ifndef OPENSSL_NO_SECURE_MEMORY
  50 static size_t secure_mem_used;
  51
  52 static int secure_mem_initialized;
  53
  54 static CRYPTO_RWLOCK *sec_malloc_lock = NULL;
  55
  56 /*
  57  * These are the functions that must be implemented by a secure heap (sh).
  58  */
  59 static int sh_init(size_t size, size_t minsize);
  60 static void *sh_malloc(size_t size);
  61 static void sh_free(void *ptr);
  62 static void sh_done(void);
  63 static size_t sh_actual_size(char *ptr);
  64 static int sh_allocated(const char *ptr);
  65 #endif
  66
  67 int CRYPTO_secure_malloc_init(size_t size, size_t minsize)
  68 {
  69 #ifndef OPENSSL_NO_SECURE_MEMORY
  70     int ret = 0;
  71
  72     if (!secure_mem_initialized) {
  73         sec_malloc_lock = CRYPTO_THREAD_lock_new();
  74         if (sec_malloc_lock == NULL)
  75             return 0;
  76         if ((ret = sh_init(size, minsize)) != 0) {
  77             secure_mem_initialized = 1;
  78         } else {
  79             CRYPTO_THREAD_lock_free(sec_malloc_lock);
  80             sec_malloc_lock = NULL;
  81         }
  82     }
  83
  84     return ret;
  85 #else
  86     return 0;
  87 #endif /* OPENSSL_NO_SECURE_MEMORY */
  88 }
  89
  90 int CRYPTO_secure_malloc_done(void)
  91 {
  92 #ifndef OPENSSL_NO_SECURE_MEMORY
  93     if (secure_mem_used == 0) {
  94         sh_done();
  95         secure_mem_initialized = 0;
  96         CRYPTO_THREAD_lock_free(sec_malloc_lock);
  97         sec_malloc_lock = NULL;
  98         return 1;
  99     }
 100 #endif /* OPENSSL_NO_SECURE_MEMORY */
 101     return 0;
 102 }
 103
 104 int CRYPTO_secure_malloc_initialized(void)
 105 {
 106 #ifndef OPENSSL_NO_SECURE_MEMORY
 107     return secure_mem_initialized;
 108 #else
 109     return 0;
 110 #endif /* OPENSSL_NO_SECURE_MEMORY */
 111 }
 112
 113 void *CRYPTO_secure_malloc(size_t num, const char *file, int line)
 114 {
 115 #ifndef OPENSSL_NO_SECURE_MEMORY
 116     void *ret;
 117     size_t actual_size;
 118
 119     if (!secure_mem_initialized) {
 120         return CRYPTO_malloc(num, file, line);
 121     }
 122     CRYPTO_THREAD_write_lock(sec_malloc_lock);
 123     ret = sh_malloc(num);
 124     actual_size = ret ? sh_actual_size(ret) : 0;
 125     secure_mem_used += actual_size;
 126     CRYPTO_THREAD_unlock(sec_malloc_lock);
 127     return ret;
 128 #else
 129     return CRYPTO_malloc(num, file, line);
 130 #endif /* OPENSSL_NO_SECURE_MEMORY */
 131 }
 132
 133 void *CRYPTO_secure_zalloc(size_t num, const char *file, int line)
 134 {
 135 #ifndef OPENSSL_NO_SECURE_MEMORY
 136     if (secure_mem_initialized)
 137         /* CRYPTO_secure_malloc() zeroes allocations when it is implemented */
 138         return CRYPTO_secure_malloc(num, file, line);
 139 #endif
 140     return CRYPTO_zalloc(num, file, line);
 141 }
 142
 143 void CRYPTO_secure_free(void *ptr, const char *file, int line)
 144 {
 145 #ifndef OPENSSL_NO_SECURE_MEMORY
 146     size_t actual_size;
 147
 148     if (ptr == NULL)
 149         return;
 150     if (!CRYPTO_secure_allocated(ptr)) {
 151         CRYPTO_free(ptr, file, line);
 152         return;
 153     }
 154     CRYPTO_THREAD_write_lock(sec_malloc_lock);
 155     actual_size = sh_actual_size(ptr);
 156     CLEAR(ptr, actual_size);
 157     secure_mem_used -= actual_size;
 158     sh_free(ptr);
 159     CRYPTO_THREAD_unlock(sec_malloc_lock);
 160 #else
 161     CRYPTO_free(ptr, file, line);
 162 #endif /* OPENSSL_NO_SECURE_MEMORY */
 163 }
 164
 165 void CRYPTO_secure_clear_free(void *ptr, size_t num,
 166                               const char *file, int line)
 167 {
 168 #ifndef OPENSSL_NO_SECURE_MEMORY
 169     size_t actual_size;
 170
 171     if (ptr == NULL)
 172         return;
 173     if (!CRYPTO_secure_allocated(ptr)) {
 174         OPENSSL_cleanse(ptr, num);
 175         CRYPTO_free(ptr, file, line);
 176         return;
 177     }
 178     CRYPTO_THREAD_write_lock(sec_malloc_lock);
 179     actual_size = sh_actual_size(ptr);
 180     CLEAR(ptr, actual_size);
 181     secure_mem_used -= actual_size;
 182     sh_free(ptr);
 183     CRYPTO_THREAD_unlock(sec_malloc_lock);
 184 #else
 185     if (ptr == NULL)
 186         return;
 187     OPENSSL_cleanse(ptr, num);
 188     CRYPTO_free(ptr, file, line);
 189 #endif /* OPENSSL_NO_SECURE_MEMORY */
 190 }
 191
 192 int CRYPTO_secure_allocated(const void *ptr)
 193 {
 194 #ifndef OPENSSL_NO_SECURE_MEMORY
 195     int ret;
 196
 197     if (!secure_mem_initialized)
 198         return 0;
 199     CRYPTO_THREAD_write_lock(sec_malloc_lock);
 200     ret = sh_allocated(ptr);
 201     CRYPTO_THREAD_unlock(sec_malloc_lock);
 202     return ret;
 203 #else
 204     return 0;
 205 #endif /* OPENSSL_NO_SECURE_MEMORY */
 206 }
 207
 208 size_t CRYPTO_secure_used(void)
 209 {
 210 #ifndef OPENSSL_NO_SECURE_MEMORY
 211     return secure_mem_used;
 212 #else
 213     return 0;
 214 #endif /* OPENSSL_NO_SECURE_MEMORY */
 215 }
 216
 217 size_t CRYPTO_secure_actual_size(void *ptr)
 218 {
 219 #ifndef OPENSSL_NO_SECURE_MEMORY
 220     size_t actual_size;
 221
 222     CRYPTO_THREAD_write_lock(sec_malloc_lock);
 223     actual_size = sh_actual_size(ptr);
 224     CRYPTO_THREAD_unlock(sec_malloc_lock);
 225     return actual_size;
 226 #else
 227     return 0;
 228 #endif
 229 }
 230
 231 /*
 232  * SECURE HEAP IMPLEMENTATION
 233  */
 234 #ifndef OPENSSL_NO_SECURE_MEMORY
 235
 236
 237 /*
 238  * The implementation provided here uses a fixed-sized mmap() heap,
 239  * which is locked into memory, not written to core files, and protected
 240  * on either side by an unmapped page, which will catch pointer overruns
 241  * (or underruns) and an attempt to read data out of the secure heap.
 242  * Free'd memory is zero'd or otherwise cleansed.
 243  *
 244  * This is a pretty standard buddy allocator.  We keep areas in a multiple
 245  * of "sh.minsize" units.  The freelist and bitmaps are kept separately,
 246  * so all (and only) data is kept in the mmap'd heap.
 247  *
 248  * This code assumes eight-bit bytes.  The numbers 3 and 7 are all over the
 249  * place.
 250  */
 251
 252 #define ONE ((size_t)1)
 253
 254 # define TESTBIT(t, b)  (t[(b) >> 3] &  (ONE << ((b) & 7)))
 255 # define SETBIT(t, b)   (t[(b) >> 3] |= (ONE << ((b) & 7)))
 256 # define CLEARBIT(t, b) (t[(b) >> 3] &= (0xFF & ~(ONE << ((b) & 7))))
 257
 258 #define WITHIN_ARENA(p) \
 259     ((char*)(p) >= sh.arena && (char*)(p) < &sh.arena[sh.arena_size])
 260 #define WITHIN_FREELIST(p) \
 261     ((char*)(p) >= (char*)sh.freelist && (char*)(p) < (char*)&sh.freelist[sh.freelist_size])
 262
 263
 264 typedef struct sh_list_st
 265 {
 266     struct sh_list_st *next;
 267     struct sh_list_st **p_next;
 268 } SH_LIST;
 269
 270 typedef struct sh_st
 271 {
 272     char* map_result;
 273     size_t map_size;
 274     char *arena;
 275     size_t arena_size;
 276     char **freelist;
 277     ossl_ssize_t freelist_size;
 278     size_t minsize;
 279     unsigned char *bittable;
 280     unsigned char *bitmalloc;
 281     size_t bittable_size; /* size in bits */
 282 } SH;
 283
 284 static SH sh;
 285
 286 static size_t sh_getlist(char *ptr)
 287 {
 288     ossl_ssize_t list = sh.freelist_size - 1;
 289     size_t bit = (sh.arena_size + ptr - sh.arena) / sh.minsize;
 290
 291     for (; bit; bit >>= 1, list--) {
 292         if (TESTBIT(sh.bittable, bit))
 293             break;
 294         OPENSSL_assert((bit & 1) == 0);
 295     }
 296
 297     return list;
 298 }
 299
 300
 301 static int sh_testbit(char *ptr, int list, unsigned char *table)
 302 {
 303     size_t bit;
 304
 305     OPENSSL_assert(list >= 0 && list < sh.freelist_size);
 306     OPENSSL_assert(((ptr - sh.arena) & ((sh.arena_size >> list) - 1)) == 0);
 307     bit = (ONE << list) + ((ptr - sh.arena) / (sh.arena_size >> list));
 308     OPENSSL_assert(bit > 0 && bit < sh.bittable_size);
 309     return TESTBIT(table, bit);
 310 }
 311
 312 static void sh_clearbit(char *ptr, int list, unsigned char *table)
 313 {
 314     size_t bit;
 315
 316     OPENSSL_assert(list >= 0 && list < sh.freelist_size);
 317     OPENSSL_assert(((ptr - sh.arena) & ((sh.arena_size >> list) - 1)) == 0);
 318     bit = (ONE << list) + ((ptr - sh.arena) / (sh.arena_size >> list));
 319     OPENSSL_assert(bit > 0 && bit < sh.bittable_size);
 320     OPENSSL_assert(TESTBIT(table, bit));
 321     CLEARBIT(table, bit);
 322 }
 323
 324 static void sh_setbit(char *ptr, int list, unsigned char *table)
 325 {
 326     size_t bit;
 327
 328     OPENSSL_assert(list >= 0 && list < sh.freelist_size);
 329     OPENSSL_assert(((ptr - sh.arena) & ((sh.arena_size >> list) - 1)) == 0);
 330     bit = (ONE << list) + ((ptr - sh.arena) / (sh.arena_size >> list));
 331     OPENSSL_assert(bit > 0 && bit < sh.bittable_size);
 332     OPENSSL_assert(!TESTBIT(table, bit));
 333     SETBIT(table, bit);
 334 }
 335
 336 static void sh_add_to_list(char **list, char *ptr)
 337 {
 338     SH_LIST *temp;
 339
 340     OPENSSL_assert(WITHIN_FREELIST(list));
 341     OPENSSL_assert(WITHIN_ARENA(ptr));
 342
 343     temp = (SH_LIST *)ptr;
 344     temp->next = *(SH_LIST **)list;
 345     OPENSSL_assert(temp->next == NULL || WITHIN_ARENA(temp->next));
 346     temp->p_next = (SH_LIST **)list;
 347
 348     if (temp->next != NULL) {
 349         OPENSSL_assert((char **)temp->next->p_next == list);
 350         temp->next->p_next = &(temp->next);
 351     }
 352
 353     *list = ptr;
 354 }
 355
 356 static void sh_remove_from_list(char *ptr)
 357 {
 358     SH_LIST *temp, *temp2;
 359
 360     temp = (SH_LIST *)ptr;
 361     if (temp->next != NULL)
 362         temp->next->p_next = temp->p_next;
 363     *temp->p_next = temp->next;
 364     if (temp->next == NULL)
 365         return;
 366
 367     temp2 = temp->next;
 368     OPENSSL_assert(WITHIN_FREELIST(temp2->p_next) || WITHIN_ARENA(temp2->p_next));
 369 }
 370
 371
 372 static int sh_init(size_t size, size_t minsize)
 373 {
 374     int ret;
 375     size_t i;
 376     size_t pgsize;
 377     size_t aligned;
 378
 379     memset(&sh, 0, sizeof(sh));
 380
 381     /* make sure size is a powers of 2 */
 382     OPENSSL_assert(size > 0);
 383     OPENSSL_assert((size & (size - 1)) == 0);
 384     if (size == 0 || (size & (size - 1)) != 0)
 385         goto err;
 386
 387     if (minsize <= sizeof(SH_LIST)) {
 388         OPENSSL_assert(sizeof(SH_LIST) <= 65536);
 389         /*
 390          * Compute the minimum possible allocation size.
 391          * This must be a power of 2 and at least as large as the SH_LIST
 392          * structure.
 393          */
 394         minsize = sizeof(SH_LIST) - 1;
 395         minsize |= minsize >> 1;
 396         minsize |= minsize >> 2;
 397         if (sizeof(SH_LIST) > 16)
 398             minsize |= minsize >> 4;
 399         if (sizeof(SH_LIST) > 256)
 400             minsize |= minsize >> 8;
 401         minsize++;
 402     } else {
 403         /* make sure minsize is a powers of 2 */
 404           OPENSSL_assert((minsize & (minsize - 1)) == 0);
 405           if ((minsize & (minsize - 1)) != 0)
 406               goto err;
 407     }
 408
 409     sh.arena_size = size;
 410     sh.minsize = minsize;
 411     sh.bittable_size = (sh.arena_size / sh.minsize) * 2;
 412
 413     /* Prevent allocations of size 0 later on */
 414     if (sh.bittable_size >> 3 == 0)
 415         goto err;
 416
 417     sh.freelist_size = -1;
 418     for (i = sh.bittable_size; i; i >>= 1)
 419         sh.freelist_size++;
 420
 421     sh.freelist = OPENSSL_zalloc(sh.freelist_size * sizeof(char *));
 422     OPENSSL_assert(sh.freelist != NULL);
 423     if (sh.freelist == NULL)
 424         goto err;
 425
 426     sh.bittable = OPENSSL_zalloc(sh.bittable_size >> 3);
 427     OPENSSL_assert(sh.bittable != NULL);
 428     if (sh.bittable == NULL)
 429         goto err;
 430
 431     sh.bitmalloc = OPENSSL_zalloc(sh.bittable_size >> 3);
 432     OPENSSL_assert(sh.bitmalloc != NULL);
 433     if (sh.bitmalloc == NULL)
 434         goto err;
 435
 436     /* Allocate space for heap, and two extra pages as guards */
 437 #if defined(_SC_PAGE_SIZE) || defined (_SC_PAGESIZE)
 438     {
 439 # if defined(_SC_PAGE_SIZE)
 440         long tmppgsize = sysconf(_SC_PAGE_SIZE);
 441 # else
 442         long tmppgsize = sysconf(_SC_PAGESIZE);
 443 # endif
 444         if (tmppgsize < 1)
 445             pgsize = PAGE_SIZE;
 446         else
 447             pgsize = (size_t)tmppgsize;
 448     }
 449 #else
 450     pgsize = PAGE_SIZE;
 451 #endif
 452     sh.map_size = pgsize + sh.arena_size + pgsize;
 453
 454 #ifdef MAP_ANON
 455     sh.map_result = mmap(NULL, sh.map_size,
 456                          PROT_READ|PROT_WRITE, MAP_ANON|MAP_PRIVATE, -1, 0);
 457 #else
 458     {
 459         int fd;
 460
 461         sh.map_result = MAP_FAILED;
 462         if ((fd = open("/dev/zero", O_RDWR)) >= 0) {
 463             sh.map_result = mmap(NULL, sh.map_size,
 464                                  PROT_READ|PROT_WRITE, MAP_PRIVATE, fd, 0);
 465             close(fd);
 466         }
 467     }
 468 #endif
 469     if (sh.map_result == MAP_FAILED)
 470         goto err;
 471     sh.arena = (char *)(sh.map_result + pgsize);
 472     sh_setbit(sh.arena, 0, sh.bittable);
 473     sh_add_to_list(&sh.freelist[0], sh.arena);
 474
 475     /* Now try to add guard pages and lock into memory. */
 476     ret = 1;
 477
 478     /* Starting guard is already aligned from mmap. */
 479     if (mprotect(sh.map_result, pgsize, PROT_NONE) < 0)
 480         ret = 2;
 481
 482     /* Ending guard page - need to round up to page boundary */
 483     aligned = (pgsize + sh.arena_size + (pgsize - 1)) & ~(pgsize - 1);
 484     if (mprotect(sh.map_result + aligned, pgsize, PROT_NONE) < 0)
 485         ret = 2;
 486
 487 #if defined(OPENSSL_SYS_LINUX) && defined(MLOCK_ONFAULT) && defined(SYS_mlock2)
 488     if (syscall(SYS_mlock2, sh.arena, sh.arena_size, MLOCK_ONFAULT) < 0) {
 489         if (errno == ENOSYS) {
 490             if (mlock(sh.arena, sh.arena_size) < 0)
 491                 ret = 2;
 492         } else {
 493             ret = 2;
 494         }
 495     }
 496 #else
 497     if (mlock(sh.arena, sh.arena_size) < 0)
 498         ret = 2;
 499 #endif
 500 #ifdef MADV_DONTDUMP
 501     if (madvise(sh.arena, sh.arena_size, MADV_DONTDUMP) < 0)
 502         ret = 2;
 503 #endif
 504
 505     return ret;
 506
 507  err:
 508     sh_done();
 509     return 0;
 510 }
 511
 512 static void sh_done(void)
 513 {
 514     OPENSSL_free(sh.freelist);
 515     OPENSSL_free(sh.bittable);
 516     OPENSSL_free(sh.bitmalloc);
 517     if (sh.map_result != NULL && sh.map_size)
 518         munmap(sh.map_result, sh.map_size);
 519     memset(&sh, 0, sizeof(sh));
 520 }
 521
 522 static int sh_allocated(const char *ptr)
 523 {
 524     return WITHIN_ARENA(ptr) ? 1 : 0;
 525 }
 526
 527 static char *sh_find_my_buddy(char *ptr, int list)
 528 {
 529     size_t bit;
 530     char *chunk = NULL;
 531
 532     bit = (ONE << list) + (ptr - sh.arena) / (sh.arena_size >> list);
 533     bit ^= 1;
 534
 535     if (TESTBIT(sh.bittable, bit) && !TESTBIT(sh.bitmalloc, bit))
 536         chunk = sh.arena + ((bit & ((ONE << list) - 1)) * (sh.arena_size >> list));
 537
 538     return chunk;
 539 }
 540
 541 static void *sh_malloc(size_t size)
 542 {
 543     ossl_ssize_t list, slist;
 544     size_t i;
 545     char *chunk;
 546
 547     if (size > sh.arena_size)
 548         return NULL;
 549
 550     list = sh.freelist_size - 1;
 551     for (i = sh.minsize; i < size; i <<= 1)
 552         list--;
 553     if (list < 0)
 554         return NULL;
 555
 556     /* try to find a larger entry to split */
 557     for (slist = list; slist >= 0; slist--)
 558         if (sh.freelist[slist] != NULL)
 559             break;
 560     if (slist < 0)
 561         return NULL;
 562
 563     /* split larger entry */
 564     while (slist != list) {
 565         char *temp = sh.freelist[slist];
 566
 567         /* remove from bigger list */
 568         OPENSSL_assert(!sh_testbit(temp, slist, sh.bitmalloc));
 569         sh_clearbit(temp, slist, sh.bittable);
 570         sh_remove_from_list(temp);
 571         OPENSSL_assert(temp != sh.freelist[slist]);
 572
 573         /* done with bigger list */
 574         slist++;
 575
 576         /* add to smaller list */
 577         OPENSSL_assert(!sh_testbit(temp, slist, sh.bitmalloc));
 578         sh_setbit(temp, slist, sh.bittable);
 579         sh_add_to_list(&sh.freelist[slist], temp);
 580         OPENSSL_assert(sh.freelist[slist] == temp);
 581
 582         /* split in 2 */
 583         temp += sh.arena_size >> slist;
 584         OPENSSL_assert(!sh_testbit(temp, slist, sh.bitmalloc));
 585         sh_setbit(temp, slist, sh.bittable);
 586         sh_add_to_list(&sh.freelist[slist], temp);
 587         OPENSSL_assert(sh.freelist[slist] == temp);
 588
 589         OPENSSL_assert(temp-(sh.arena_size >> slist) == sh_find_my_buddy(temp, slist));
 590     }
 591
 592     /* peel off memory to hand back */
 593     chunk = sh.freelist[list];
 594     OPENSSL_assert(sh_testbit(chunk, list, sh.bittable));
 595     sh_setbit(chunk, list, sh.bitmalloc);
 596     sh_remove_from_list(chunk);
 597
 598     OPENSSL_assert(WITHIN_ARENA(chunk));
 599
 600     /* zero the free list header as a precaution against information leakage */
 601     memset(chunk, 0, sizeof(SH_LIST));
 602
 603     return chunk;
 604 }
 605
 606 static void sh_free(void *ptr)
 607 {
 608     size_t list;
 609     void *buddy;
 610
 611     if (ptr == NULL)
 612         return;
 613     OPENSSL_assert(WITHIN_ARENA(ptr));
 614     if (!WITHIN_ARENA(ptr))
 615         return;
 616
 617     list = sh_getlist(ptr);
 618     OPENSSL_assert(sh_testbit(ptr, list, sh.bittable));
 619     sh_clearbit(ptr, list, sh.bitmalloc);
 620     sh_add_to_list(&sh.freelist[list], ptr);
 621
 622     /* Try to coalesce two adjacent free areas. */
 623     while ((buddy = sh_find_my_buddy(ptr, list)) != NULL) {
 624         OPENSSL_assert(ptr == sh_find_my_buddy(buddy, list));
 625         OPENSSL_assert(ptr != NULL);
 626         OPENSSL_assert(!sh_testbit(ptr, list, sh.bitmalloc));
 627         sh_clearbit(ptr, list, sh.bittable);
 628         sh_remove_from_list(ptr);
 629         OPENSSL_assert(!sh_testbit(ptr, list, sh.bitmalloc));
 630         sh_clearbit(buddy, list, sh.bittable);
 631         sh_remove_from_list(buddy);
 632
 633         list--;
 634
 635         /* Zero the higher addressed block's free list pointers */
 636         memset(ptr > buddy ? ptr : buddy, 0, sizeof(SH_LIST));
 637         if (ptr > buddy)
 638             ptr = buddy;
 639
 640         OPENSSL_assert(!sh_testbit(ptr, list, sh.bitmalloc));
 641         sh_setbit(ptr, list, sh.bittable);
 642         sh_add_to_list(&sh.freelist[list], ptr);
 643         OPENSSL_assert(sh.freelist[list] == ptr);
 644     }
 645 }
 646
 647 static size_t sh_actual_size(char *ptr)
 648 {
 649     int list;
 650
 651     OPENSSL_assert(WITHIN_ARENA(ptr));
 652     if (!WITHIN_ARENA(ptr))
 653         return 0;
 654     list = sh_getlist(ptr);
 655     OPENSSL_assert(sh_testbit(ptr, list, sh.bittable));
 656     return sh.arena_size / (ONE << list);
 657 }
 658 #endif /* OPENSSL_NO_SECURE_MEMORY */