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Commit | Line | Data |
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4f22f405 | 1 | /* |
48e5119a | 2 | * Copyright 2015-2018 The OpenSSL Project Authors. All Rights Reserved. |
624265c6 | 3 | * Copyright 2004-2014, Akamai Technologies. All Rights Reserved. |
4f22f405 RS |
4 | * |
5 | * Licensed under the OpenSSL license (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 | ||
74924dcb RS |
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 | */ | |
bef7a815 | 18 | #include "e_os.h" |
07016a8a | 19 | #include <openssl/crypto.h> |
74924dcb | 20 | |
183733f8 RL |
21 | #include <string.h> |
22 | ||
e44c7d02 | 23 | /* e_os.h includes unistd.h, which defines _POSIX_VERSION */ |
154d8c13 | 24 | #if !defined(OPENSSL_NO_SECURE_MEMORY) && defined(OPENSSL_SYS_UNIX) \ |
5839185c AP |
25 | && ( (defined(_POSIX_VERSION) && _POSIX_VERSION >= 200112L) \ |
26 | || defined(__sun) || defined(__hpux) || defined(__sgi) \ | |
27 | || defined(__osf__) ) | |
74924dcb | 28 | # define IMPLEMENTED |
d4dfb0ba | 29 | # include <stdlib.h> |
d4dfb0ba RS |
30 | # include <assert.h> |
31 | # include <unistd.h> | |
27186da7 | 32 | # include <sys/types.h> |
74924dcb | 33 | # include <sys/mman.h> |
9dfc5b96 TS |
34 | # if defined(OPENSSL_SYS_LINUX) |
35 | # include <sys/syscall.h> | |
36 | # include <linux/mman.h> | |
37 | # include <errno.h> | |
38 | # endif | |
74924dcb | 39 | # include <sys/param.h> |
27186da7 AP |
40 | # include <sys/stat.h> |
41 | # include <fcntl.h> | |
74924dcb RS |
42 | #endif |
43 | ||
74924dcb | 44 | #define CLEAR(p, s) OPENSSL_cleanse(p, s) |
34750dc2 BL |
45 | #ifndef PAGE_SIZE |
46 | # define PAGE_SIZE 4096 | |
47 | #endif | |
014cc4b2 AP |
48 | #if !defined(MAP_ANON) && defined(MAP_ANONYMOUS) |
49 | # define MAP_ANON MAP_ANONYMOUS | |
50 | #endif | |
74924dcb RS |
51 | |
52 | #ifdef IMPLEMENTED | |
df2ee0e2 | 53 | static size_t secure_mem_used; |
74924dcb RS |
54 | |
55 | static int secure_mem_initialized; | |
74924dcb | 56 | |
9471f776 MC |
57 | static CRYPTO_RWLOCK *sec_malloc_lock = NULL; |
58 | ||
74924dcb RS |
59 | /* |
60 | * These are the functions that must be implemented by a secure heap (sh). | |
61 | */ | |
62 | static int sh_init(size_t size, int minsize); | |
332dc4fa RS |
63 | static void *sh_malloc(size_t size); |
64 | static void sh_free(void *ptr); | |
74924dcb | 65 | static void sh_done(void); |
e8408681 | 66 | static size_t sh_actual_size(char *ptr); |
74924dcb RS |
67 | static int sh_allocated(const char *ptr); |
68 | #endif | |
69 | ||
70 | int CRYPTO_secure_malloc_init(size_t size, int minsize) | |
71 | { | |
72 | #ifdef IMPLEMENTED | |
73 | int ret = 0; | |
74 | ||
74924dcb | 75 | if (!secure_mem_initialized) { |
63ab5ea1 | 76 | sec_malloc_lock = CRYPTO_THREAD_lock_new(); |
9471f776 MC |
77 | if (sec_malloc_lock == NULL) |
78 | return 0; | |
7031ddac TS |
79 | if ((ret = sh_init(size, minsize)) != 0) { |
80 | secure_mem_initialized = 1; | |
81 | } else { | |
82 | CRYPTO_THREAD_lock_free(sec_malloc_lock); | |
83 | sec_malloc_lock = NULL; | |
84 | } | |
74924dcb | 85 | } |
9471f776 | 86 | |
74924dcb RS |
87 | return ret; |
88 | #else | |
89 | return 0; | |
90 | #endif /* IMPLEMENTED */ | |
91 | } | |
92 | ||
e8408681 | 93 | int CRYPTO_secure_malloc_done() |
74924dcb RS |
94 | { |
95 | #ifdef IMPLEMENTED | |
e8408681 TS |
96 | if (secure_mem_used == 0) { |
97 | sh_done(); | |
98 | secure_mem_initialized = 0; | |
99 | CRYPTO_THREAD_lock_free(sec_malloc_lock); | |
7031ddac | 100 | sec_malloc_lock = NULL; |
e8408681 TS |
101 | return 1; |
102 | } | |
74924dcb | 103 | #endif /* IMPLEMENTED */ |
e8408681 | 104 | return 0; |
74924dcb RS |
105 | } |
106 | ||
107 | int CRYPTO_secure_malloc_initialized() | |
108 | { | |
109 | #ifdef IMPLEMENTED | |
110 | return secure_mem_initialized; | |
111 | #else | |
112 | return 0; | |
113 | #endif /* IMPLEMENTED */ | |
114 | } | |
115 | ||
ff842856 | 116 | void *CRYPTO_secure_malloc(size_t num, const char *file, int line) |
74924dcb RS |
117 | { |
118 | #ifdef IMPLEMENTED | |
119 | void *ret; | |
120 | size_t actual_size; | |
121 | ||
122 | if (!secure_mem_initialized) { | |
74924dcb RS |
123 | return CRYPTO_malloc(num, file, line); |
124 | } | |
9471f776 | 125 | CRYPTO_THREAD_write_lock(sec_malloc_lock); |
74924dcb RS |
126 | ret = sh_malloc(num); |
127 | actual_size = ret ? sh_actual_size(ret) : 0; | |
128 | secure_mem_used += actual_size; | |
9471f776 | 129 | CRYPTO_THREAD_unlock(sec_malloc_lock); |
74924dcb RS |
130 | return ret; |
131 | #else | |
132 | return CRYPTO_malloc(num, file, line); | |
133 | #endif /* IMPLEMENTED */ | |
134 | } | |
135 | ||
3538c7da RS |
136 | void *CRYPTO_secure_zalloc(size_t num, const char *file, int line) |
137 | { | |
138 | void *ret = CRYPTO_secure_malloc(num, file, line); | |
139 | ||
140 | if (ret != NULL) | |
141 | memset(ret, 0, num); | |
142 | return ret; | |
143 | } | |
144 | ||
05c7b163 | 145 | void CRYPTO_secure_free(void *ptr, const char *file, int line) |
74924dcb RS |
146 | { |
147 | #ifdef IMPLEMENTED | |
148 | size_t actual_size; | |
149 | ||
150 | if (ptr == NULL) | |
151 | return; | |
e8408681 | 152 | if (!CRYPTO_secure_allocated(ptr)) { |
05c7b163 | 153 | CRYPTO_free(ptr, file, line); |
74924dcb RS |
154 | return; |
155 | } | |
9471f776 | 156 | CRYPTO_THREAD_write_lock(sec_malloc_lock); |
74924dcb RS |
157 | actual_size = sh_actual_size(ptr); |
158 | CLEAR(ptr, actual_size); | |
159 | secure_mem_used -= actual_size; | |
160 | sh_free(ptr); | |
9471f776 | 161 | CRYPTO_THREAD_unlock(sec_malloc_lock); |
74924dcb | 162 | #else |
6a78ae28 | 163 | CRYPTO_free(ptr, file, line); |
74924dcb RS |
164 | #endif /* IMPLEMENTED */ |
165 | } | |
166 | ||
4dae7cd3 BE |
167 | void CRYPTO_secure_clear_free(void *ptr, size_t num, |
168 | const char *file, int line) | |
169 | { | |
170 | #ifdef IMPLEMENTED | |
171 | size_t actual_size; | |
172 | ||
173 | if (ptr == NULL) | |
174 | return; | |
175 | if (!CRYPTO_secure_allocated(ptr)) { | |
176 | OPENSSL_cleanse(ptr, num); | |
177 | CRYPTO_free(ptr, file, line); | |
178 | return; | |
179 | } | |
180 | CRYPTO_THREAD_write_lock(sec_malloc_lock); | |
181 | actual_size = sh_actual_size(ptr); | |
182 | CLEAR(ptr, actual_size); | |
183 | secure_mem_used -= actual_size; | |
184 | sh_free(ptr); | |
185 | CRYPTO_THREAD_unlock(sec_malloc_lock); | |
186 | #else | |
187 | if (ptr == NULL) | |
188 | return; | |
189 | OPENSSL_cleanse(ptr, num); | |
190 | CRYPTO_free(ptr, file, line); | |
191 | #endif /* IMPLEMENTED */ | |
192 | } | |
193 | ||
74924dcb RS |
194 | int CRYPTO_secure_allocated(const void *ptr) |
195 | { | |
196 | #ifdef IMPLEMENTED | |
197 | int ret; | |
198 | ||
199 | if (!secure_mem_initialized) | |
200 | return 0; | |
9471f776 | 201 | CRYPTO_THREAD_write_lock(sec_malloc_lock); |
74924dcb | 202 | ret = sh_allocated(ptr); |
9471f776 | 203 | CRYPTO_THREAD_unlock(sec_malloc_lock); |
74924dcb RS |
204 | return ret; |
205 | #else | |
206 | return 0; | |
207 | #endif /* IMPLEMENTED */ | |
208 | } | |
209 | ||
bbd86bf5 RS |
210 | size_t CRYPTO_secure_used() |
211 | { | |
212 | #ifdef IMPLEMENTED | |
213 | return secure_mem_used; | |
214 | #else | |
215 | return 0; | |
216 | #endif /* IMPLEMENTED */ | |
217 | } | |
218 | ||
d594199b RS |
219 | size_t CRYPTO_secure_actual_size(void *ptr) |
220 | { | |
221 | #ifdef IMPLEMENTED | |
222 | size_t actual_size; | |
223 | ||
9471f776 | 224 | CRYPTO_THREAD_write_lock(sec_malloc_lock); |
d594199b | 225 | actual_size = sh_actual_size(ptr); |
9471f776 | 226 | CRYPTO_THREAD_unlock(sec_malloc_lock); |
d594199b RS |
227 | return actual_size; |
228 | #else | |
229 | return 0; | |
230 | #endif | |
231 | } | |
74924dcb RS |
232 | /* END OF PAGE ... |
233 | ||
234 | ... START OF PAGE */ | |
235 | ||
236 | /* | |
237 | * SECURE HEAP IMPLEMENTATION | |
238 | */ | |
239 | #ifdef IMPLEMENTED | |
240 | ||
241 | ||
242 | /* | |
243 | * The implementation provided here uses a fixed-sized mmap() heap, | |
244 | * which is locked into memory, not written to core files, and protected | |
245 | * on either side by an unmapped page, which will catch pointer overruns | |
246 | * (or underruns) and an attempt to read data out of the secure heap. | |
247 | * Free'd memory is zero'd or otherwise cleansed. | |
248 | * | |
249 | * This is a pretty standard buddy allocator. We keep areas in a multiple | |
250 | * of "sh.minsize" units. The freelist and bitmaps are kept separately, | |
251 | * so all (and only) data is kept in the mmap'd heap. | |
252 | * | |
253 | * This code assumes eight-bit bytes. The numbers 3 and 7 are all over the | |
254 | * place. | |
255 | */ | |
256 | ||
e8408681 TS |
257 | #define ONE ((size_t)1) |
258 | ||
259 | # define TESTBIT(t, b) (t[(b) >> 3] & (ONE << ((b) & 7))) | |
260 | # define SETBIT(t, b) (t[(b) >> 3] |= (ONE << ((b) & 7))) | |
261 | # define CLEARBIT(t, b) (t[(b) >> 3] &= (0xFF & ~(ONE << ((b) & 7)))) | |
74924dcb RS |
262 | |
263 | #define WITHIN_ARENA(p) \ | |
264 | ((char*)(p) >= sh.arena && (char*)(p) < &sh.arena[sh.arena_size]) | |
265 | #define WITHIN_FREELIST(p) \ | |
266 | ((char*)(p) >= (char*)sh.freelist && (char*)(p) < (char*)&sh.freelist[sh.freelist_size]) | |
267 | ||
268 | ||
269 | typedef struct sh_list_st | |
270 | { | |
271 | struct sh_list_st *next; | |
272 | struct sh_list_st **p_next; | |
273 | } SH_LIST; | |
274 | ||
275 | typedef struct sh_st | |
276 | { | |
277 | char* map_result; | |
278 | size_t map_size; | |
279 | char *arena; | |
e8408681 | 280 | size_t arena_size; |
74924dcb | 281 | char **freelist; |
e8408681 TS |
282 | ossl_ssize_t freelist_size; |
283 | size_t minsize; | |
74924dcb RS |
284 | unsigned char *bittable; |
285 | unsigned char *bitmalloc; | |
e8408681 | 286 | size_t bittable_size; /* size in bits */ |
74924dcb RS |
287 | } SH; |
288 | ||
289 | static SH sh; | |
290 | ||
e8408681 | 291 | static size_t sh_getlist(char *ptr) |
74924dcb | 292 | { |
e8408681 TS |
293 | ossl_ssize_t list = sh.freelist_size - 1; |
294 | size_t bit = (sh.arena_size + ptr - sh.arena) / sh.minsize; | |
74924dcb RS |
295 | |
296 | for (; bit; bit >>= 1, list--) { | |
297 | if (TESTBIT(sh.bittable, bit)) | |
298 | break; | |
299 | OPENSSL_assert((bit & 1) == 0); | |
300 | } | |
301 | ||
302 | return list; | |
303 | } | |
304 | ||
305 | ||
306 | static int sh_testbit(char *ptr, int list, unsigned char *table) | |
307 | { | |
e8408681 | 308 | size_t bit; |
74924dcb RS |
309 | |
310 | OPENSSL_assert(list >= 0 && list < sh.freelist_size); | |
311 | OPENSSL_assert(((ptr - sh.arena) & ((sh.arena_size >> list) - 1)) == 0); | |
e8408681 | 312 | bit = (ONE << list) + ((ptr - sh.arena) / (sh.arena_size >> list)); |
74924dcb RS |
313 | OPENSSL_assert(bit > 0 && bit < sh.bittable_size); |
314 | return TESTBIT(table, bit); | |
315 | } | |
316 | ||
317 | static void sh_clearbit(char *ptr, int list, unsigned char *table) | |
318 | { | |
e8408681 | 319 | size_t bit; |
74924dcb RS |
320 | |
321 | OPENSSL_assert(list >= 0 && list < sh.freelist_size); | |
322 | OPENSSL_assert(((ptr - sh.arena) & ((sh.arena_size >> list) - 1)) == 0); | |
e8408681 | 323 | bit = (ONE << list) + ((ptr - sh.arena) / (sh.arena_size >> list)); |
74924dcb RS |
324 | OPENSSL_assert(bit > 0 && bit < sh.bittable_size); |
325 | OPENSSL_assert(TESTBIT(table, bit)); | |
326 | CLEARBIT(table, bit); | |
327 | } | |
328 | ||
329 | static void sh_setbit(char *ptr, int list, unsigned char *table) | |
330 | { | |
e8408681 | 331 | size_t bit; |
74924dcb RS |
332 | |
333 | OPENSSL_assert(list >= 0 && list < sh.freelist_size); | |
334 | OPENSSL_assert(((ptr - sh.arena) & ((sh.arena_size >> list) - 1)) == 0); | |
e8408681 | 335 | bit = (ONE << list) + ((ptr - sh.arena) / (sh.arena_size >> list)); |
74924dcb RS |
336 | OPENSSL_assert(bit > 0 && bit < sh.bittable_size); |
337 | OPENSSL_assert(!TESTBIT(table, bit)); | |
338 | SETBIT(table, bit); | |
339 | } | |
340 | ||
341 | static void sh_add_to_list(char **list, char *ptr) | |
342 | { | |
343 | SH_LIST *temp; | |
344 | ||
345 | OPENSSL_assert(WITHIN_FREELIST(list)); | |
346 | OPENSSL_assert(WITHIN_ARENA(ptr)); | |
347 | ||
348 | temp = (SH_LIST *)ptr; | |
349 | temp->next = *(SH_LIST **)list; | |
350 | OPENSSL_assert(temp->next == NULL || WITHIN_ARENA(temp->next)); | |
351 | temp->p_next = (SH_LIST **)list; | |
352 | ||
353 | if (temp->next != NULL) { | |
354 | OPENSSL_assert((char **)temp->next->p_next == list); | |
355 | temp->next->p_next = &(temp->next); | |
356 | } | |
357 | ||
358 | *list = ptr; | |
359 | } | |
360 | ||
a773b52a | 361 | static void sh_remove_from_list(char *ptr) |
74924dcb RS |
362 | { |
363 | SH_LIST *temp, *temp2; | |
364 | ||
365 | temp = (SH_LIST *)ptr; | |
366 | if (temp->next != NULL) | |
367 | temp->next->p_next = temp->p_next; | |
368 | *temp->p_next = temp->next; | |
369 | if (temp->next == NULL) | |
370 | return; | |
371 | ||
372 | temp2 = temp->next; | |
373 | OPENSSL_assert(WITHIN_FREELIST(temp2->p_next) || WITHIN_ARENA(temp2->p_next)); | |
374 | } | |
375 | ||
376 | ||
377 | static int sh_init(size_t size, int minsize) | |
378 | { | |
7031ddac TS |
379 | int ret; |
380 | size_t i; | |
74924dcb RS |
381 | size_t pgsize; |
382 | size_t aligned; | |
383 | ||
cbe29648 | 384 | memset(&sh, 0, sizeof(sh)); |
74924dcb RS |
385 | |
386 | /* make sure size and minsize are powers of 2 */ | |
387 | OPENSSL_assert(size > 0); | |
388 | OPENSSL_assert((size & (size - 1)) == 0); | |
389 | OPENSSL_assert(minsize > 0); | |
390 | OPENSSL_assert((minsize & (minsize - 1)) == 0); | |
391 | if (size <= 0 || (size & (size - 1)) != 0) | |
392 | goto err; | |
393 | if (minsize <= 0 || (minsize & (minsize - 1)) != 0) | |
394 | goto err; | |
395 | ||
70e14ffb P |
396 | while (minsize < (int)sizeof(SH_LIST)) |
397 | minsize *= 2; | |
398 | ||
74924dcb RS |
399 | sh.arena_size = size; |
400 | sh.minsize = minsize; | |
401 | sh.bittable_size = (sh.arena_size / sh.minsize) * 2; | |
402 | ||
7f07149d GV |
403 | /* Prevent allocations of size 0 later on */ |
404 | if (sh.bittable_size >> 3 == 0) | |
405 | goto err; | |
406 | ||
74924dcb RS |
407 | sh.freelist_size = -1; |
408 | for (i = sh.bittable_size; i; i >>= 1) | |
409 | sh.freelist_size++; | |
410 | ||
cbe29648 | 411 | sh.freelist = OPENSSL_zalloc(sh.freelist_size * sizeof(char *)); |
74924dcb RS |
412 | OPENSSL_assert(sh.freelist != NULL); |
413 | if (sh.freelist == NULL) | |
414 | goto err; | |
74924dcb | 415 | |
b51bce94 | 416 | sh.bittable = OPENSSL_zalloc(sh.bittable_size >> 3); |
74924dcb RS |
417 | OPENSSL_assert(sh.bittable != NULL); |
418 | if (sh.bittable == NULL) | |
419 | goto err; | |
74924dcb | 420 | |
b51bce94 | 421 | sh.bitmalloc = OPENSSL_zalloc(sh.bittable_size >> 3); |
74924dcb RS |
422 | OPENSSL_assert(sh.bitmalloc != NULL); |
423 | if (sh.bitmalloc == NULL) | |
424 | goto err; | |
74924dcb RS |
425 | |
426 | /* Allocate space for heap, and two extra pages as guards */ | |
9ae720b4 MC |
427 | #if defined(_SC_PAGE_SIZE) || defined (_SC_PAGESIZE) |
428 | { | |
429 | # if defined(_SC_PAGE_SIZE) | |
430 | long tmppgsize = sysconf(_SC_PAGE_SIZE); | |
431 | # else | |
432 | long tmppgsize = sysconf(_SC_PAGESIZE); | |
433 | # endif | |
434 | if (tmppgsize < 1) | |
435 | pgsize = PAGE_SIZE; | |
436 | else | |
437 | pgsize = (size_t)tmppgsize; | |
438 | } | |
74924dcb RS |
439 | #else |
440 | pgsize = PAGE_SIZE; | |
441 | #endif | |
442 | sh.map_size = pgsize + sh.arena_size + pgsize; | |
27186da7 AP |
443 | if (1) { |
444 | #ifdef MAP_ANON | |
445 | sh.map_result = mmap(NULL, sh.map_size, | |
446 | PROT_READ|PROT_WRITE, MAP_ANON|MAP_PRIVATE, -1, 0); | |
447 | } else { | |
448 | #endif | |
449 | int fd; | |
450 | ||
451 | sh.map_result = MAP_FAILED; | |
452 | if ((fd = open("/dev/zero", O_RDWR)) >= 0) { | |
453 | sh.map_result = mmap(NULL, sh.map_size, | |
454 | PROT_READ|PROT_WRITE, MAP_PRIVATE, fd, 0); | |
455 | close(fd); | |
456 | } | |
457 | } | |
74924dcb RS |
458 | if (sh.map_result == MAP_FAILED) |
459 | goto err; | |
460 | sh.arena = (char *)(sh.map_result + pgsize); | |
461 | sh_setbit(sh.arena, 0, sh.bittable); | |
462 | sh_add_to_list(&sh.freelist[0], sh.arena); | |
463 | ||
464 | /* Now try to add guard pages and lock into memory. */ | |
465 | ret = 1; | |
466 | ||
467 | /* Starting guard is already aligned from mmap. */ | |
468 | if (mprotect(sh.map_result, pgsize, PROT_NONE) < 0) | |
469 | ret = 2; | |
470 | ||
471 | /* Ending guard page - need to round up to page boundary */ | |
472 | aligned = (pgsize + sh.arena_size + (pgsize - 1)) & ~(pgsize - 1); | |
473 | if (mprotect(sh.map_result + aligned, pgsize, PROT_NONE) < 0) | |
474 | ret = 2; | |
475 | ||
9dfc5b96 TS |
476 | #if defined(OPENSSL_SYS_LINUX) && defined(MLOCK_ONFAULT) && defined(SYS_mlock2) |
477 | if (syscall(SYS_mlock2, sh.arena, sh.arena_size, MLOCK_ONFAULT) < 0) { | |
478 | if (errno == ENOSYS) { | |
479 | if (mlock(sh.arena, sh.arena_size) < 0) | |
480 | ret = 2; | |
481 | } else { | |
482 | ret = 2; | |
483 | } | |
484 | } | |
485 | #else | |
74924dcb RS |
486 | if (mlock(sh.arena, sh.arena_size) < 0) |
487 | ret = 2; | |
9dfc5b96 | 488 | #endif |
74924dcb RS |
489 | #ifdef MADV_DONTDUMP |
490 | if (madvise(sh.arena, sh.arena_size, MADV_DONTDUMP) < 0) | |
491 | ret = 2; | |
492 | #endif | |
493 | ||
494 | return ret; | |
495 | ||
496 | err: | |
497 | sh_done(); | |
498 | return 0; | |
499 | } | |
500 | ||
501 | static void sh_done() | |
502 | { | |
503 | OPENSSL_free(sh.freelist); | |
504 | OPENSSL_free(sh.bittable); | |
505 | OPENSSL_free(sh.bitmalloc); | |
506 | if (sh.map_result != NULL && sh.map_size) | |
507 | munmap(sh.map_result, sh.map_size); | |
cbe29648 | 508 | memset(&sh, 0, sizeof(sh)); |
74924dcb RS |
509 | } |
510 | ||
511 | static int sh_allocated(const char *ptr) | |
512 | { | |
513 | return WITHIN_ARENA(ptr) ? 1 : 0; | |
514 | } | |
515 | ||
516 | static char *sh_find_my_buddy(char *ptr, int list) | |
517 | { | |
e8408681 | 518 | size_t bit; |
74924dcb RS |
519 | char *chunk = NULL; |
520 | ||
e8408681 | 521 | bit = (ONE << list) + (ptr - sh.arena) / (sh.arena_size >> list); |
74924dcb RS |
522 | bit ^= 1; |
523 | ||
524 | if (TESTBIT(sh.bittable, bit) && !TESTBIT(sh.bitmalloc, bit)) | |
e8408681 | 525 | chunk = sh.arena + ((bit & ((ONE << list) - 1)) * (sh.arena_size >> list)); |
74924dcb RS |
526 | |
527 | return chunk; | |
528 | } | |
529 | ||
332dc4fa | 530 | static void *sh_malloc(size_t size) |
74924dcb | 531 | { |
e8408681 | 532 | ossl_ssize_t list, slist; |
74924dcb RS |
533 | size_t i; |
534 | char *chunk; | |
535 | ||
7031ddac TS |
536 | if (size > sh.arena_size) |
537 | return NULL; | |
538 | ||
74924dcb RS |
539 | list = sh.freelist_size - 1; |
540 | for (i = sh.minsize; i < size; i <<= 1) | |
541 | list--; | |
542 | if (list < 0) | |
543 | return NULL; | |
544 | ||
545 | /* try to find a larger entry to split */ | |
546 | for (slist = list; slist >= 0; slist--) | |
547 | if (sh.freelist[slist] != NULL) | |
548 | break; | |
549 | if (slist < 0) | |
550 | return NULL; | |
551 | ||
552 | /* split larger entry */ | |
553 | while (slist != list) { | |
554 | char *temp = sh.freelist[slist]; | |
555 | ||
556 | /* remove from bigger list */ | |
557 | OPENSSL_assert(!sh_testbit(temp, slist, sh.bitmalloc)); | |
558 | sh_clearbit(temp, slist, sh.bittable); | |
a773b52a | 559 | sh_remove_from_list(temp); |
74924dcb RS |
560 | OPENSSL_assert(temp != sh.freelist[slist]); |
561 | ||
562 | /* done with bigger list */ | |
563 | slist++; | |
564 | ||
565 | /* add to smaller list */ | |
566 | OPENSSL_assert(!sh_testbit(temp, slist, sh.bitmalloc)); | |
567 | sh_setbit(temp, slist, sh.bittable); | |
568 | sh_add_to_list(&sh.freelist[slist], temp); | |
569 | OPENSSL_assert(sh.freelist[slist] == temp); | |
570 | ||
571 | /* split in 2 */ | |
572 | temp += sh.arena_size >> slist; | |
573 | OPENSSL_assert(!sh_testbit(temp, slist, sh.bitmalloc)); | |
574 | sh_setbit(temp, slist, sh.bittable); | |
575 | sh_add_to_list(&sh.freelist[slist], temp); | |
576 | OPENSSL_assert(sh.freelist[slist] == temp); | |
577 | ||
578 | OPENSSL_assert(temp-(sh.arena_size >> slist) == sh_find_my_buddy(temp, slist)); | |
579 | } | |
580 | ||
581 | /* peel off memory to hand back */ | |
582 | chunk = sh.freelist[list]; | |
583 | OPENSSL_assert(sh_testbit(chunk, list, sh.bittable)); | |
584 | sh_setbit(chunk, list, sh.bitmalloc); | |
a773b52a | 585 | sh_remove_from_list(chunk); |
74924dcb RS |
586 | |
587 | OPENSSL_assert(WITHIN_ARENA(chunk)); | |
588 | ||
589 | return chunk; | |
590 | } | |
591 | ||
332dc4fa | 592 | static void sh_free(void *ptr) |
74924dcb | 593 | { |
e8408681 | 594 | size_t list; |
332dc4fa | 595 | void *buddy; |
74924dcb RS |
596 | |
597 | if (ptr == NULL) | |
598 | return; | |
599 | OPENSSL_assert(WITHIN_ARENA(ptr)); | |
600 | if (!WITHIN_ARENA(ptr)) | |
601 | return; | |
602 | ||
603 | list = sh_getlist(ptr); | |
604 | OPENSSL_assert(sh_testbit(ptr, list, sh.bittable)); | |
605 | sh_clearbit(ptr, list, sh.bitmalloc); | |
606 | sh_add_to_list(&sh.freelist[list], ptr); | |
607 | ||
608 | /* Try to coalesce two adjacent free areas. */ | |
609 | while ((buddy = sh_find_my_buddy(ptr, list)) != NULL) { | |
610 | OPENSSL_assert(ptr == sh_find_my_buddy(buddy, list)); | |
611 | OPENSSL_assert(ptr != NULL); | |
612 | OPENSSL_assert(!sh_testbit(ptr, list, sh.bitmalloc)); | |
613 | sh_clearbit(ptr, list, sh.bittable); | |
a773b52a | 614 | sh_remove_from_list(ptr); |
74924dcb RS |
615 | OPENSSL_assert(!sh_testbit(ptr, list, sh.bitmalloc)); |
616 | sh_clearbit(buddy, list, sh.bittable); | |
a773b52a | 617 | sh_remove_from_list(buddy); |
74924dcb RS |
618 | |
619 | list--; | |
620 | ||
621 | if (ptr > buddy) | |
622 | ptr = buddy; | |
623 | ||
624 | OPENSSL_assert(!sh_testbit(ptr, list, sh.bitmalloc)); | |
625 | sh_setbit(ptr, list, sh.bittable); | |
626 | sh_add_to_list(&sh.freelist[list], ptr); | |
627 | OPENSSL_assert(sh.freelist[list] == ptr); | |
628 | } | |
629 | } | |
630 | ||
e8408681 | 631 | static size_t sh_actual_size(char *ptr) |
74924dcb RS |
632 | { |
633 | int list; | |
634 | ||
635 | OPENSSL_assert(WITHIN_ARENA(ptr)); | |
636 | if (!WITHIN_ARENA(ptr)) | |
637 | return 0; | |
638 | list = sh_getlist(ptr); | |
639 | OPENSSL_assert(sh_testbit(ptr, list, sh.bittable)); | |
e8408681 | 640 | return sh.arena_size / (ONE << list); |
74924dcb RS |
641 | } |
642 | #endif /* IMPLEMENTED */ |