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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 | 4 | * |
0e9725bc | 5 | * Licensed under the Apache License 2.0 (the "License"). You may not use |
4f22f405 RS |
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 | ||
8529b156 DMSP |
23 | /* e_os.h defines OPENSSL_SECURE_MEMORY if secure memory can be implemented */ |
24 | #ifdef OPENSSL_SECURE_MEMORY | |
d4dfb0ba | 25 | # include <stdlib.h> |
d4dfb0ba RS |
26 | # include <assert.h> |
27 | # include <unistd.h> | |
27186da7 | 28 | # include <sys/types.h> |
74924dcb | 29 | # include <sys/mman.h> |
9dfc5b96 TS |
30 | # if defined(OPENSSL_SYS_LINUX) |
31 | # include <sys/syscall.h> | |
f1c00b93 AP |
32 | # if defined(SYS_mlock2) |
33 | # include <linux/mman.h> | |
34 | # include <errno.h> | |
35 | # endif | |
61783db5 | 36 | # include <sys/param.h> |
9dfc5b96 | 37 | # endif |
27186da7 AP |
38 | # include <sys/stat.h> |
39 | # include <fcntl.h> | |
74924dcb RS |
40 | #endif |
41 | ||
74924dcb | 42 | #define CLEAR(p, s) OPENSSL_cleanse(p, s) |
34750dc2 BL |
43 | #ifndef PAGE_SIZE |
44 | # define PAGE_SIZE 4096 | |
45 | #endif | |
014cc4b2 AP |
46 | #if !defined(MAP_ANON) && defined(MAP_ANONYMOUS) |
47 | # define MAP_ANON MAP_ANONYMOUS | |
48 | #endif | |
74924dcb | 49 | |
8529b156 | 50 | #ifdef OPENSSL_SECURE_MEMORY |
df2ee0e2 | 51 | static size_t secure_mem_used; |
74924dcb RS |
52 | |
53 | static int secure_mem_initialized; | |
74924dcb | 54 | |
9471f776 MC |
55 | static CRYPTO_RWLOCK *sec_malloc_lock = NULL; |
56 | ||
74924dcb RS |
57 | /* |
58 | * These are the functions that must be implemented by a secure heap (sh). | |
59 | */ | |
60 | static int sh_init(size_t size, int minsize); | |
332dc4fa RS |
61 | static void *sh_malloc(size_t size); |
62 | static void sh_free(void *ptr); | |
74924dcb | 63 | static void sh_done(void); |
e8408681 | 64 | static size_t sh_actual_size(char *ptr); |
74924dcb RS |
65 | static int sh_allocated(const char *ptr); |
66 | #endif | |
67 | ||
68 | int CRYPTO_secure_malloc_init(size_t size, int minsize) | |
69 | { | |
8529b156 | 70 | #ifdef OPENSSL_SECURE_MEMORY |
74924dcb RS |
71 | int ret = 0; |
72 | ||
74924dcb | 73 | if (!secure_mem_initialized) { |
63ab5ea1 | 74 | sec_malloc_lock = CRYPTO_THREAD_lock_new(); |
9471f776 MC |
75 | if (sec_malloc_lock == NULL) |
76 | return 0; | |
7031ddac TS |
77 | if ((ret = sh_init(size, minsize)) != 0) { |
78 | secure_mem_initialized = 1; | |
79 | } else { | |
80 | CRYPTO_THREAD_lock_free(sec_malloc_lock); | |
81 | sec_malloc_lock = NULL; | |
82 | } | |
74924dcb | 83 | } |
9471f776 | 84 | |
74924dcb RS |
85 | return ret; |
86 | #else | |
87 | return 0; | |
8529b156 | 88 | #endif /* OPENSSL_SECURE_MEMORY */ |
74924dcb RS |
89 | } |
90 | ||
3cb7c5cf | 91 | int CRYPTO_secure_malloc_done(void) |
74924dcb | 92 | { |
8529b156 | 93 | #ifdef OPENSSL_SECURE_MEMORY |
e8408681 TS |
94 | if (secure_mem_used == 0) { |
95 | sh_done(); | |
96 | secure_mem_initialized = 0; | |
97 | CRYPTO_THREAD_lock_free(sec_malloc_lock); | |
7031ddac | 98 | sec_malloc_lock = NULL; |
e8408681 TS |
99 | return 1; |
100 | } | |
8529b156 | 101 | #endif /* OPENSSL_SECURE_MEMORY */ |
e8408681 | 102 | return 0; |
74924dcb RS |
103 | } |
104 | ||
3cb7c5cf | 105 | int CRYPTO_secure_malloc_initialized(void) |
74924dcb | 106 | { |
8529b156 | 107 | #ifdef OPENSSL_SECURE_MEMORY |
74924dcb RS |
108 | return secure_mem_initialized; |
109 | #else | |
110 | return 0; | |
8529b156 | 111 | #endif /* OPENSSL_SECURE_MEMORY */ |
74924dcb RS |
112 | } |
113 | ||
ff842856 | 114 | void *CRYPTO_secure_malloc(size_t num, const char *file, int line) |
74924dcb | 115 | { |
8529b156 | 116 | #ifdef OPENSSL_SECURE_MEMORY |
74924dcb RS |
117 | void *ret; |
118 | size_t actual_size; | |
119 | ||
120 | if (!secure_mem_initialized) { | |
74924dcb RS |
121 | return CRYPTO_malloc(num, file, line); |
122 | } | |
9471f776 | 123 | CRYPTO_THREAD_write_lock(sec_malloc_lock); |
74924dcb RS |
124 | ret = sh_malloc(num); |
125 | actual_size = ret ? sh_actual_size(ret) : 0; | |
126 | secure_mem_used += actual_size; | |
9471f776 | 127 | CRYPTO_THREAD_unlock(sec_malloc_lock); |
74924dcb RS |
128 | return ret; |
129 | #else | |
130 | return CRYPTO_malloc(num, file, line); | |
8529b156 | 131 | #endif /* OPENSSL_SECURE_MEMORY */ |
74924dcb RS |
132 | } |
133 | ||
3538c7da RS |
134 | void *CRYPTO_secure_zalloc(size_t num, const char *file, int line) |
135 | { | |
8529b156 | 136 | #ifdef OPENSSL_SECURE_MEMORY |
3b8e97ab P |
137 | if (secure_mem_initialized) |
138 | /* CRYPTO_secure_malloc() zeroes allocations when it is implemented */ | |
139 | return CRYPTO_secure_malloc(num, file, line); | |
140 | #endif | |
141 | return CRYPTO_zalloc(num, file, line); | |
3538c7da RS |
142 | } |
143 | ||
05c7b163 | 144 | void CRYPTO_secure_free(void *ptr, const char *file, int line) |
74924dcb | 145 | { |
8529b156 | 146 | #ifdef OPENSSL_SECURE_MEMORY |
74924dcb RS |
147 | size_t actual_size; |
148 | ||
149 | if (ptr == NULL) | |
150 | return; | |
e8408681 | 151 | if (!CRYPTO_secure_allocated(ptr)) { |
05c7b163 | 152 | CRYPTO_free(ptr, file, line); |
74924dcb RS |
153 | return; |
154 | } | |
9471f776 | 155 | CRYPTO_THREAD_write_lock(sec_malloc_lock); |
74924dcb RS |
156 | actual_size = sh_actual_size(ptr); |
157 | CLEAR(ptr, actual_size); | |
158 | secure_mem_used -= actual_size; | |
159 | sh_free(ptr); | |
9471f776 | 160 | CRYPTO_THREAD_unlock(sec_malloc_lock); |
74924dcb | 161 | #else |
6a78ae28 | 162 | CRYPTO_free(ptr, file, line); |
8529b156 | 163 | #endif /* OPENSSL_SECURE_MEMORY */ |
74924dcb RS |
164 | } |
165 | ||
4dae7cd3 BE |
166 | void CRYPTO_secure_clear_free(void *ptr, size_t num, |
167 | const char *file, int line) | |
168 | { | |
8529b156 | 169 | #ifdef OPENSSL_SECURE_MEMORY |
4dae7cd3 BE |
170 | size_t actual_size; |
171 | ||
172 | if (ptr == NULL) | |
173 | return; | |
174 | if (!CRYPTO_secure_allocated(ptr)) { | |
175 | OPENSSL_cleanse(ptr, num); | |
176 | CRYPTO_free(ptr, file, line); | |
177 | return; | |
178 | } | |
179 | CRYPTO_THREAD_write_lock(sec_malloc_lock); | |
180 | actual_size = sh_actual_size(ptr); | |
181 | CLEAR(ptr, actual_size); | |
182 | secure_mem_used -= actual_size; | |
183 | sh_free(ptr); | |
184 | CRYPTO_THREAD_unlock(sec_malloc_lock); | |
185 | #else | |
186 | if (ptr == NULL) | |
187 | return; | |
188 | OPENSSL_cleanse(ptr, num); | |
189 | CRYPTO_free(ptr, file, line); | |
8529b156 | 190 | #endif /* OPENSSL_SECURE_MEMORY */ |
4dae7cd3 BE |
191 | } |
192 | ||
74924dcb RS |
193 | int CRYPTO_secure_allocated(const void *ptr) |
194 | { | |
8529b156 | 195 | #ifdef OPENSSL_SECURE_MEMORY |
74924dcb RS |
196 | int ret; |
197 | ||
198 | if (!secure_mem_initialized) | |
199 | return 0; | |
9471f776 | 200 | CRYPTO_THREAD_write_lock(sec_malloc_lock); |
74924dcb | 201 | ret = sh_allocated(ptr); |
9471f776 | 202 | CRYPTO_THREAD_unlock(sec_malloc_lock); |
74924dcb RS |
203 | return ret; |
204 | #else | |
205 | return 0; | |
8529b156 | 206 | #endif /* OPENSSL_SECURE_MEMORY */ |
74924dcb RS |
207 | } |
208 | ||
3cb7c5cf | 209 | size_t CRYPTO_secure_used(void) |
bbd86bf5 | 210 | { |
8529b156 | 211 | #ifdef OPENSSL_SECURE_MEMORY |
bbd86bf5 RS |
212 | return secure_mem_used; |
213 | #else | |
214 | return 0; | |
8529b156 | 215 | #endif /* OPENSSL_SECURE_MEMORY */ |
bbd86bf5 RS |
216 | } |
217 | ||
d594199b RS |
218 | size_t CRYPTO_secure_actual_size(void *ptr) |
219 | { | |
8529b156 | 220 | #ifdef OPENSSL_SECURE_MEMORY |
d594199b RS |
221 | size_t actual_size; |
222 | ||
9471f776 | 223 | CRYPTO_THREAD_write_lock(sec_malloc_lock); |
d594199b | 224 | actual_size = sh_actual_size(ptr); |
9471f776 | 225 | CRYPTO_THREAD_unlock(sec_malloc_lock); |
d594199b RS |
226 | return actual_size; |
227 | #else | |
228 | return 0; | |
229 | #endif | |
230 | } | |
74924dcb RS |
231 | /* END OF PAGE ... |
232 | ||
233 | ... START OF PAGE */ | |
234 | ||
235 | /* | |
236 | * SECURE HEAP IMPLEMENTATION | |
237 | */ | |
8529b156 | 238 | #ifdef OPENSSL_SECURE_MEMORY |
74924dcb RS |
239 | |
240 | ||
241 | /* | |
242 | * The implementation provided here uses a fixed-sized mmap() heap, | |
243 | * which is locked into memory, not written to core files, and protected | |
244 | * on either side by an unmapped page, which will catch pointer overruns | |
245 | * (or underruns) and an attempt to read data out of the secure heap. | |
246 | * Free'd memory is zero'd or otherwise cleansed. | |
247 | * | |
248 | * This is a pretty standard buddy allocator. We keep areas in a multiple | |
249 | * of "sh.minsize" units. The freelist and bitmaps are kept separately, | |
250 | * so all (and only) data is kept in the mmap'd heap. | |
251 | * | |
252 | * This code assumes eight-bit bytes. The numbers 3 and 7 are all over the | |
253 | * place. | |
254 | */ | |
255 | ||
e8408681 TS |
256 | #define ONE ((size_t)1) |
257 | ||
258 | # define TESTBIT(t, b) (t[(b) >> 3] & (ONE << ((b) & 7))) | |
259 | # define SETBIT(t, b) (t[(b) >> 3] |= (ONE << ((b) & 7))) | |
260 | # define CLEARBIT(t, b) (t[(b) >> 3] &= (0xFF & ~(ONE << ((b) & 7)))) | |
74924dcb RS |
261 | |
262 | #define WITHIN_ARENA(p) \ | |
263 | ((char*)(p) >= sh.arena && (char*)(p) < &sh.arena[sh.arena_size]) | |
264 | #define WITHIN_FREELIST(p) \ | |
265 | ((char*)(p) >= (char*)sh.freelist && (char*)(p) < (char*)&sh.freelist[sh.freelist_size]) | |
266 | ||
267 | ||
268 | typedef struct sh_list_st | |
269 | { | |
270 | struct sh_list_st *next; | |
271 | struct sh_list_st **p_next; | |
272 | } SH_LIST; | |
273 | ||
274 | typedef struct sh_st | |
275 | { | |
276 | char* map_result; | |
277 | size_t map_size; | |
278 | char *arena; | |
e8408681 | 279 | size_t arena_size; |
74924dcb | 280 | char **freelist; |
e8408681 TS |
281 | ossl_ssize_t freelist_size; |
282 | size_t minsize; | |
74924dcb RS |
283 | unsigned char *bittable; |
284 | unsigned char *bitmalloc; | |
e8408681 | 285 | size_t bittable_size; /* size in bits */ |
74924dcb RS |
286 | } SH; |
287 | ||
288 | static SH sh; | |
289 | ||
e8408681 | 290 | static size_t sh_getlist(char *ptr) |
74924dcb | 291 | { |
e8408681 TS |
292 | ossl_ssize_t list = sh.freelist_size - 1; |
293 | size_t bit = (sh.arena_size + ptr - sh.arena) / sh.minsize; | |
74924dcb RS |
294 | |
295 | for (; bit; bit >>= 1, list--) { | |
296 | if (TESTBIT(sh.bittable, bit)) | |
297 | break; | |
298 | OPENSSL_assert((bit & 1) == 0); | |
299 | } | |
300 | ||
301 | return list; | |
302 | } | |
303 | ||
304 | ||
305 | static int sh_testbit(char *ptr, int list, unsigned char *table) | |
306 | { | |
e8408681 | 307 | size_t bit; |
74924dcb RS |
308 | |
309 | OPENSSL_assert(list >= 0 && list < sh.freelist_size); | |
310 | OPENSSL_assert(((ptr - sh.arena) & ((sh.arena_size >> list) - 1)) == 0); | |
e8408681 | 311 | bit = (ONE << list) + ((ptr - sh.arena) / (sh.arena_size >> list)); |
74924dcb RS |
312 | OPENSSL_assert(bit > 0 && bit < sh.bittable_size); |
313 | return TESTBIT(table, bit); | |
314 | } | |
315 | ||
316 | static void sh_clearbit(char *ptr, int list, unsigned char *table) | |
317 | { | |
e8408681 | 318 | size_t bit; |
74924dcb RS |
319 | |
320 | OPENSSL_assert(list >= 0 && list < sh.freelist_size); | |
321 | OPENSSL_assert(((ptr - sh.arena) & ((sh.arena_size >> list) - 1)) == 0); | |
e8408681 | 322 | bit = (ONE << list) + ((ptr - sh.arena) / (sh.arena_size >> list)); |
74924dcb RS |
323 | OPENSSL_assert(bit > 0 && bit < sh.bittable_size); |
324 | OPENSSL_assert(TESTBIT(table, bit)); | |
325 | CLEARBIT(table, bit); | |
326 | } | |
327 | ||
328 | static void sh_setbit(char *ptr, int list, unsigned char *table) | |
329 | { | |
e8408681 | 330 | size_t bit; |
74924dcb RS |
331 | |
332 | OPENSSL_assert(list >= 0 && list < sh.freelist_size); | |
333 | OPENSSL_assert(((ptr - sh.arena) & ((sh.arena_size >> list) - 1)) == 0); | |
e8408681 | 334 | bit = (ONE << list) + ((ptr - sh.arena) / (sh.arena_size >> list)); |
74924dcb RS |
335 | OPENSSL_assert(bit > 0 && bit < sh.bittable_size); |
336 | OPENSSL_assert(!TESTBIT(table, bit)); | |
337 | SETBIT(table, bit); | |
338 | } | |
339 | ||
340 | static void sh_add_to_list(char **list, char *ptr) | |
341 | { | |
342 | SH_LIST *temp; | |
343 | ||
344 | OPENSSL_assert(WITHIN_FREELIST(list)); | |
345 | OPENSSL_assert(WITHIN_ARENA(ptr)); | |
346 | ||
347 | temp = (SH_LIST *)ptr; | |
348 | temp->next = *(SH_LIST **)list; | |
349 | OPENSSL_assert(temp->next == NULL || WITHIN_ARENA(temp->next)); | |
350 | temp->p_next = (SH_LIST **)list; | |
351 | ||
352 | if (temp->next != NULL) { | |
353 | OPENSSL_assert((char **)temp->next->p_next == list); | |
354 | temp->next->p_next = &(temp->next); | |
355 | } | |
356 | ||
357 | *list = ptr; | |
358 | } | |
359 | ||
a773b52a | 360 | static void sh_remove_from_list(char *ptr) |
74924dcb RS |
361 | { |
362 | SH_LIST *temp, *temp2; | |
363 | ||
364 | temp = (SH_LIST *)ptr; | |
365 | if (temp->next != NULL) | |
366 | temp->next->p_next = temp->p_next; | |
367 | *temp->p_next = temp->next; | |
368 | if (temp->next == NULL) | |
369 | return; | |
370 | ||
371 | temp2 = temp->next; | |
372 | OPENSSL_assert(WITHIN_FREELIST(temp2->p_next) || WITHIN_ARENA(temp2->p_next)); | |
373 | } | |
374 | ||
375 | ||
376 | static int sh_init(size_t size, int minsize) | |
377 | { | |
7031ddac TS |
378 | int ret; |
379 | size_t i; | |
74924dcb RS |
380 | size_t pgsize; |
381 | size_t aligned; | |
382 | ||
cbe29648 | 383 | memset(&sh, 0, sizeof(sh)); |
74924dcb RS |
384 | |
385 | /* make sure size and minsize are powers of 2 */ | |
386 | OPENSSL_assert(size > 0); | |
387 | OPENSSL_assert((size & (size - 1)) == 0); | |
388 | OPENSSL_assert(minsize > 0); | |
389 | OPENSSL_assert((minsize & (minsize - 1)) == 0); | |
390 | if (size <= 0 || (size & (size - 1)) != 0) | |
391 | goto err; | |
392 | if (minsize <= 0 || (minsize & (minsize - 1)) != 0) | |
393 | goto err; | |
394 | ||
70e14ffb P |
395 | while (minsize < (int)sizeof(SH_LIST)) |
396 | minsize *= 2; | |
397 | ||
74924dcb RS |
398 | sh.arena_size = size; |
399 | sh.minsize = minsize; | |
400 | sh.bittable_size = (sh.arena_size / sh.minsize) * 2; | |
401 | ||
7f07149d GV |
402 | /* Prevent allocations of size 0 later on */ |
403 | if (sh.bittable_size >> 3 == 0) | |
404 | goto err; | |
405 | ||
74924dcb RS |
406 | sh.freelist_size = -1; |
407 | for (i = sh.bittable_size; i; i >>= 1) | |
408 | sh.freelist_size++; | |
409 | ||
cbe29648 | 410 | sh.freelist = OPENSSL_zalloc(sh.freelist_size * sizeof(char *)); |
74924dcb RS |
411 | OPENSSL_assert(sh.freelist != NULL); |
412 | if (sh.freelist == NULL) | |
413 | goto err; | |
74924dcb | 414 | |
b51bce94 | 415 | sh.bittable = OPENSSL_zalloc(sh.bittable_size >> 3); |
74924dcb RS |
416 | OPENSSL_assert(sh.bittable != NULL); |
417 | if (sh.bittable == NULL) | |
418 | goto err; | |
74924dcb | 419 | |
b51bce94 | 420 | sh.bitmalloc = OPENSSL_zalloc(sh.bittable_size >> 3); |
74924dcb RS |
421 | OPENSSL_assert(sh.bitmalloc != NULL); |
422 | if (sh.bitmalloc == NULL) | |
423 | goto err; | |
74924dcb RS |
424 | |
425 | /* Allocate space for heap, and two extra pages as guards */ | |
9ae720b4 MC |
426 | #if defined(_SC_PAGE_SIZE) || defined (_SC_PAGESIZE) |
427 | { | |
428 | # if defined(_SC_PAGE_SIZE) | |
429 | long tmppgsize = sysconf(_SC_PAGE_SIZE); | |
430 | # else | |
431 | long tmppgsize = sysconf(_SC_PAGESIZE); | |
432 | # endif | |
433 | if (tmppgsize < 1) | |
434 | pgsize = PAGE_SIZE; | |
435 | else | |
436 | pgsize = (size_t)tmppgsize; | |
437 | } | |
74924dcb RS |
438 | #else |
439 | pgsize = PAGE_SIZE; | |
440 | #endif | |
441 | sh.map_size = pgsize + sh.arena_size + pgsize; | |
27186da7 AP |
442 | if (1) { |
443 | #ifdef MAP_ANON | |
444 | sh.map_result = mmap(NULL, sh.map_size, | |
445 | PROT_READ|PROT_WRITE, MAP_ANON|MAP_PRIVATE, -1, 0); | |
446 | } else { | |
447 | #endif | |
448 | int fd; | |
449 | ||
450 | sh.map_result = MAP_FAILED; | |
451 | if ((fd = open("/dev/zero", O_RDWR)) >= 0) { | |
452 | sh.map_result = mmap(NULL, sh.map_size, | |
453 | PROT_READ|PROT_WRITE, MAP_PRIVATE, fd, 0); | |
454 | close(fd); | |
455 | } | |
456 | } | |
74924dcb RS |
457 | if (sh.map_result == MAP_FAILED) |
458 | goto err; | |
459 | sh.arena = (char *)(sh.map_result + pgsize); | |
460 | sh_setbit(sh.arena, 0, sh.bittable); | |
461 | sh_add_to_list(&sh.freelist[0], sh.arena); | |
462 | ||
463 | /* Now try to add guard pages and lock into memory. */ | |
464 | ret = 1; | |
465 | ||
466 | /* Starting guard is already aligned from mmap. */ | |
467 | if (mprotect(sh.map_result, pgsize, PROT_NONE) < 0) | |
468 | ret = 2; | |
469 | ||
470 | /* Ending guard page - need to round up to page boundary */ | |
471 | aligned = (pgsize + sh.arena_size + (pgsize - 1)) & ~(pgsize - 1); | |
472 | if (mprotect(sh.map_result + aligned, pgsize, PROT_NONE) < 0) | |
473 | ret = 2; | |
474 | ||
9dfc5b96 TS |
475 | #if defined(OPENSSL_SYS_LINUX) && defined(MLOCK_ONFAULT) && defined(SYS_mlock2) |
476 | if (syscall(SYS_mlock2, sh.arena, sh.arena_size, MLOCK_ONFAULT) < 0) { | |
477 | if (errno == ENOSYS) { | |
478 | if (mlock(sh.arena, sh.arena_size) < 0) | |
479 | ret = 2; | |
480 | } else { | |
481 | ret = 2; | |
482 | } | |
483 | } | |
484 | #else | |
74924dcb RS |
485 | if (mlock(sh.arena, sh.arena_size) < 0) |
486 | ret = 2; | |
9dfc5b96 | 487 | #endif |
74924dcb RS |
488 | #ifdef MADV_DONTDUMP |
489 | if (madvise(sh.arena, sh.arena_size, MADV_DONTDUMP) < 0) | |
490 | ret = 2; | |
491 | #endif | |
492 | ||
493 | return ret; | |
494 | ||
495 | err: | |
496 | sh_done(); | |
497 | return 0; | |
498 | } | |
499 | ||
3cb7c5cf | 500 | static void sh_done(void) |
74924dcb RS |
501 | { |
502 | OPENSSL_free(sh.freelist); | |
503 | OPENSSL_free(sh.bittable); | |
504 | OPENSSL_free(sh.bitmalloc); | |
505 | if (sh.map_result != NULL && sh.map_size) | |
506 | munmap(sh.map_result, sh.map_size); | |
cbe29648 | 507 | memset(&sh, 0, sizeof(sh)); |
74924dcb RS |
508 | } |
509 | ||
510 | static int sh_allocated(const char *ptr) | |
511 | { | |
512 | return WITHIN_ARENA(ptr) ? 1 : 0; | |
513 | } | |
514 | ||
515 | static char *sh_find_my_buddy(char *ptr, int list) | |
516 | { | |
e8408681 | 517 | size_t bit; |
74924dcb RS |
518 | char *chunk = NULL; |
519 | ||
e8408681 | 520 | bit = (ONE << list) + (ptr - sh.arena) / (sh.arena_size >> list); |
74924dcb RS |
521 | bit ^= 1; |
522 | ||
523 | if (TESTBIT(sh.bittable, bit) && !TESTBIT(sh.bitmalloc, bit)) | |
e8408681 | 524 | chunk = sh.arena + ((bit & ((ONE << list) - 1)) * (sh.arena_size >> list)); |
74924dcb RS |
525 | |
526 | return chunk; | |
527 | } | |
528 | ||
332dc4fa | 529 | static void *sh_malloc(size_t size) |
74924dcb | 530 | { |
e8408681 | 531 | ossl_ssize_t list, slist; |
74924dcb RS |
532 | size_t i; |
533 | char *chunk; | |
534 | ||
7031ddac TS |
535 | if (size > sh.arena_size) |
536 | return NULL; | |
537 | ||
74924dcb RS |
538 | list = sh.freelist_size - 1; |
539 | for (i = sh.minsize; i < size; i <<= 1) | |
540 | list--; | |
541 | if (list < 0) | |
542 | return NULL; | |
543 | ||
544 | /* try to find a larger entry to split */ | |
545 | for (slist = list; slist >= 0; slist--) | |
546 | if (sh.freelist[slist] != NULL) | |
547 | break; | |
548 | if (slist < 0) | |
549 | return NULL; | |
550 | ||
551 | /* split larger entry */ | |
552 | while (slist != list) { | |
553 | char *temp = sh.freelist[slist]; | |
554 | ||
555 | /* remove from bigger list */ | |
556 | OPENSSL_assert(!sh_testbit(temp, slist, sh.bitmalloc)); | |
557 | sh_clearbit(temp, slist, sh.bittable); | |
a773b52a | 558 | sh_remove_from_list(temp); |
74924dcb RS |
559 | OPENSSL_assert(temp != sh.freelist[slist]); |
560 | ||
561 | /* done with bigger list */ | |
562 | slist++; | |
563 | ||
564 | /* add to smaller list */ | |
565 | OPENSSL_assert(!sh_testbit(temp, slist, sh.bitmalloc)); | |
566 | sh_setbit(temp, slist, sh.bittable); | |
567 | sh_add_to_list(&sh.freelist[slist], temp); | |
568 | OPENSSL_assert(sh.freelist[slist] == temp); | |
569 | ||
570 | /* split in 2 */ | |
571 | temp += sh.arena_size >> slist; | |
572 | OPENSSL_assert(!sh_testbit(temp, slist, sh.bitmalloc)); | |
573 | sh_setbit(temp, slist, sh.bittable); | |
574 | sh_add_to_list(&sh.freelist[slist], temp); | |
575 | OPENSSL_assert(sh.freelist[slist] == temp); | |
576 | ||
577 | OPENSSL_assert(temp-(sh.arena_size >> slist) == sh_find_my_buddy(temp, slist)); | |
578 | } | |
579 | ||
580 | /* peel off memory to hand back */ | |
581 | chunk = sh.freelist[list]; | |
582 | OPENSSL_assert(sh_testbit(chunk, list, sh.bittable)); | |
583 | sh_setbit(chunk, list, sh.bitmalloc); | |
a773b52a | 584 | sh_remove_from_list(chunk); |
74924dcb RS |
585 | |
586 | OPENSSL_assert(WITHIN_ARENA(chunk)); | |
587 | ||
3b8e97ab P |
588 | /* zero the free list header as a precaution against information leakage */ |
589 | memset(chunk, 0, sizeof(SH_LIST)); | |
590 | ||
74924dcb RS |
591 | return chunk; |
592 | } | |
593 | ||
332dc4fa | 594 | static void sh_free(void *ptr) |
74924dcb | 595 | { |
e8408681 | 596 | size_t list; |
332dc4fa | 597 | void *buddy; |
74924dcb RS |
598 | |
599 | if (ptr == NULL) | |
600 | return; | |
601 | OPENSSL_assert(WITHIN_ARENA(ptr)); | |
602 | if (!WITHIN_ARENA(ptr)) | |
603 | return; | |
604 | ||
605 | list = sh_getlist(ptr); | |
606 | OPENSSL_assert(sh_testbit(ptr, list, sh.bittable)); | |
607 | sh_clearbit(ptr, list, sh.bitmalloc); | |
608 | sh_add_to_list(&sh.freelist[list], ptr); | |
609 | ||
610 | /* Try to coalesce two adjacent free areas. */ | |
611 | while ((buddy = sh_find_my_buddy(ptr, list)) != NULL) { | |
612 | OPENSSL_assert(ptr == sh_find_my_buddy(buddy, list)); | |
613 | OPENSSL_assert(ptr != NULL); | |
614 | OPENSSL_assert(!sh_testbit(ptr, list, sh.bitmalloc)); | |
615 | sh_clearbit(ptr, list, sh.bittable); | |
a773b52a | 616 | sh_remove_from_list(ptr); |
74924dcb RS |
617 | OPENSSL_assert(!sh_testbit(ptr, list, sh.bitmalloc)); |
618 | sh_clearbit(buddy, list, sh.bittable); | |
a773b52a | 619 | sh_remove_from_list(buddy); |
74924dcb RS |
620 | |
621 | list--; | |
622 | ||
3b8e97ab P |
623 | /* Zero the higher addressed block's free list pointers */ |
624 | memset(ptr > buddy ? ptr : buddy, 0, sizeof(SH_LIST)); | |
74924dcb RS |
625 | if (ptr > buddy) |
626 | ptr = buddy; | |
627 | ||
628 | OPENSSL_assert(!sh_testbit(ptr, list, sh.bitmalloc)); | |
629 | sh_setbit(ptr, list, sh.bittable); | |
630 | sh_add_to_list(&sh.freelist[list], ptr); | |
631 | OPENSSL_assert(sh.freelist[list] == ptr); | |
632 | } | |
633 | } | |
634 | ||
e8408681 | 635 | static size_t sh_actual_size(char *ptr) |
74924dcb RS |
636 | { |
637 | int list; | |
638 | ||
639 | OPENSSL_assert(WITHIN_ARENA(ptr)); | |
640 | if (!WITHIN_ARENA(ptr)) | |
641 | return 0; | |
642 | list = sh_getlist(ptr); | |
643 | OPENSSL_assert(sh_testbit(ptr, list, sh.bittable)); | |
e8408681 | 644 | return sh.arena_size / (ONE << list); |
74924dcb | 645 | } |
8529b156 | 646 | #endif /* OPENSSL_SECURE_MEMORY */ |