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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 | ||
6943335e | 23 | #ifndef OPENSSL_NO_SECURE_MEMORY |
d4dfb0ba | 24 | # include <stdlib.h> |
d4dfb0ba RS |
25 | # include <assert.h> |
26 | # include <unistd.h> | |
27186da7 | 27 | # include <sys/types.h> |
74924dcb | 28 | # include <sys/mman.h> |
9dfc5b96 TS |
29 | # if defined(OPENSSL_SYS_LINUX) |
30 | # include <sys/syscall.h> | |
f1c00b93 AP |
31 | # if defined(SYS_mlock2) |
32 | # include <linux/mman.h> | |
33 | # include <errno.h> | |
34 | # endif | |
61783db5 | 35 | # include <sys/param.h> |
9dfc5b96 | 36 | # endif |
27186da7 AP |
37 | # include <sys/stat.h> |
38 | # include <fcntl.h> | |
74924dcb RS |
39 | #endif |
40 | ||
74924dcb | 41 | #define CLEAR(p, s) OPENSSL_cleanse(p, s) |
34750dc2 BL |
42 | #ifndef PAGE_SIZE |
43 | # define PAGE_SIZE 4096 | |
44 | #endif | |
014cc4b2 AP |
45 | #if !defined(MAP_ANON) && defined(MAP_ANONYMOUS) |
46 | # define MAP_ANON MAP_ANONYMOUS | |
47 | #endif | |
74924dcb | 48 | |
6943335e | 49 | #ifndef OPENSSL_NO_SECURE_MEMORY |
df2ee0e2 | 50 | static size_t secure_mem_used; |
74924dcb RS |
51 | |
52 | static int secure_mem_initialized; | |
74924dcb | 53 | |
9471f776 MC |
54 | static CRYPTO_RWLOCK *sec_malloc_lock = NULL; |
55 | ||
74924dcb RS |
56 | /* |
57 | * These are the functions that must be implemented by a secure heap (sh). | |
58 | */ | |
34b16762 | 59 | static int sh_init(size_t size, size_t minsize); |
332dc4fa RS |
60 | static void *sh_malloc(size_t size); |
61 | static void sh_free(void *ptr); | |
74924dcb | 62 | static void sh_done(void); |
e8408681 | 63 | static size_t sh_actual_size(char *ptr); |
74924dcb RS |
64 | static int sh_allocated(const char *ptr); |
65 | #endif | |
66 | ||
34b16762 | 67 | int CRYPTO_secure_malloc_init(size_t size, size_t minsize) |
74924dcb | 68 | { |
6943335e | 69 | #ifndef OPENSSL_NO_SECURE_MEMORY |
74924dcb RS |
70 | int ret = 0; |
71 | ||
74924dcb | 72 | if (!secure_mem_initialized) { |
63ab5ea1 | 73 | sec_malloc_lock = CRYPTO_THREAD_lock_new(); |
9471f776 MC |
74 | if (sec_malloc_lock == NULL) |
75 | return 0; | |
7031ddac TS |
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 | } | |
74924dcb | 82 | } |
9471f776 | 83 | |
74924dcb RS |
84 | return ret; |
85 | #else | |
86 | return 0; | |
6943335e | 87 | #endif /* OPENSSL_NO_SECURE_MEMORY */ |
74924dcb RS |
88 | } |
89 | ||
3cb7c5cf | 90 | int CRYPTO_secure_malloc_done(void) |
74924dcb | 91 | { |
6943335e | 92 | #ifndef OPENSSL_NO_SECURE_MEMORY |
e8408681 TS |
93 | if (secure_mem_used == 0) { |
94 | sh_done(); | |
95 | secure_mem_initialized = 0; | |
96 | CRYPTO_THREAD_lock_free(sec_malloc_lock); | |
7031ddac | 97 | sec_malloc_lock = NULL; |
e8408681 TS |
98 | return 1; |
99 | } | |
6943335e | 100 | #endif /* OPENSSL_NO_SECURE_MEMORY */ |
e8408681 | 101 | return 0; |
74924dcb RS |
102 | } |
103 | ||
3cb7c5cf | 104 | int CRYPTO_secure_malloc_initialized(void) |
74924dcb | 105 | { |
6943335e | 106 | #ifndef OPENSSL_NO_SECURE_MEMORY |
74924dcb RS |
107 | return secure_mem_initialized; |
108 | #else | |
109 | return 0; | |
6943335e | 110 | #endif /* OPENSSL_NO_SECURE_MEMORY */ |
74924dcb RS |
111 | } |
112 | ||
ff842856 | 113 | void *CRYPTO_secure_malloc(size_t num, const char *file, int line) |
74924dcb | 114 | { |
6943335e | 115 | #ifndef OPENSSL_NO_SECURE_MEMORY |
74924dcb RS |
116 | void *ret; |
117 | size_t actual_size; | |
118 | ||
119 | if (!secure_mem_initialized) { | |
74924dcb RS |
120 | return CRYPTO_malloc(num, file, line); |
121 | } | |
9471f776 | 122 | CRYPTO_THREAD_write_lock(sec_malloc_lock); |
74924dcb RS |
123 | ret = sh_malloc(num); |
124 | actual_size = ret ? sh_actual_size(ret) : 0; | |
125 | secure_mem_used += actual_size; | |
9471f776 | 126 | CRYPTO_THREAD_unlock(sec_malloc_lock); |
74924dcb RS |
127 | return ret; |
128 | #else | |
129 | return CRYPTO_malloc(num, file, line); | |
6943335e | 130 | #endif /* OPENSSL_NO_SECURE_MEMORY */ |
74924dcb RS |
131 | } |
132 | ||
3538c7da RS |
133 | void *CRYPTO_secure_zalloc(size_t num, const char *file, int line) |
134 | { | |
6943335e | 135 | #ifndef OPENSSL_NO_SECURE_MEMORY |
3b8e97ab P |
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); | |
3538c7da RS |
141 | } |
142 | ||
05c7b163 | 143 | void CRYPTO_secure_free(void *ptr, const char *file, int line) |
74924dcb | 144 | { |
6943335e | 145 | #ifndef OPENSSL_NO_SECURE_MEMORY |
74924dcb RS |
146 | size_t actual_size; |
147 | ||
148 | if (ptr == NULL) | |
149 | return; | |
e8408681 | 150 | if (!CRYPTO_secure_allocated(ptr)) { |
05c7b163 | 151 | CRYPTO_free(ptr, file, line); |
74924dcb RS |
152 | return; |
153 | } | |
9471f776 | 154 | CRYPTO_THREAD_write_lock(sec_malloc_lock); |
74924dcb RS |
155 | actual_size = sh_actual_size(ptr); |
156 | CLEAR(ptr, actual_size); | |
157 | secure_mem_used -= actual_size; | |
158 | sh_free(ptr); | |
9471f776 | 159 | CRYPTO_THREAD_unlock(sec_malloc_lock); |
74924dcb | 160 | #else |
6a78ae28 | 161 | CRYPTO_free(ptr, file, line); |
6943335e | 162 | #endif /* OPENSSL_NO_SECURE_MEMORY */ |
74924dcb RS |
163 | } |
164 | ||
4dae7cd3 BE |
165 | void CRYPTO_secure_clear_free(void *ptr, size_t num, |
166 | const char *file, int line) | |
167 | { | |
6943335e | 168 | #ifndef OPENSSL_NO_SECURE_MEMORY |
4dae7cd3 BE |
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); | |
6943335e | 189 | #endif /* OPENSSL_NO_SECURE_MEMORY */ |
4dae7cd3 BE |
190 | } |
191 | ||
74924dcb RS |
192 | int CRYPTO_secure_allocated(const void *ptr) |
193 | { | |
6943335e | 194 | #ifndef OPENSSL_NO_SECURE_MEMORY |
74924dcb RS |
195 | int ret; |
196 | ||
197 | if (!secure_mem_initialized) | |
198 | return 0; | |
9471f776 | 199 | CRYPTO_THREAD_write_lock(sec_malloc_lock); |
74924dcb | 200 | ret = sh_allocated(ptr); |
9471f776 | 201 | CRYPTO_THREAD_unlock(sec_malloc_lock); |
74924dcb RS |
202 | return ret; |
203 | #else | |
204 | return 0; | |
6943335e | 205 | #endif /* OPENSSL_NO_SECURE_MEMORY */ |
74924dcb RS |
206 | } |
207 | ||
3cb7c5cf | 208 | size_t CRYPTO_secure_used(void) |
bbd86bf5 | 209 | { |
6943335e | 210 | #ifndef OPENSSL_NO_SECURE_MEMORY |
bbd86bf5 RS |
211 | return secure_mem_used; |
212 | #else | |
213 | return 0; | |
6943335e | 214 | #endif /* OPENSSL_NO_SECURE_MEMORY */ |
bbd86bf5 RS |
215 | } |
216 | ||
d594199b RS |
217 | size_t CRYPTO_secure_actual_size(void *ptr) |
218 | { | |
6943335e | 219 | #ifndef OPENSSL_NO_SECURE_MEMORY |
d594199b RS |
220 | size_t actual_size; |
221 | ||
9471f776 | 222 | CRYPTO_THREAD_write_lock(sec_malloc_lock); |
d594199b | 223 | actual_size = sh_actual_size(ptr); |
9471f776 | 224 | CRYPTO_THREAD_unlock(sec_malloc_lock); |
d594199b RS |
225 | return actual_size; |
226 | #else | |
227 | return 0; | |
228 | #endif | |
229 | } | |
74924dcb RS |
230 | /* END OF PAGE ... |
231 | ||
232 | ... START OF PAGE */ | |
233 | ||
234 | /* | |
235 | * SECURE HEAP IMPLEMENTATION | |
236 | */ | |
6943335e | 237 | #ifndef OPENSSL_NO_SECURE_MEMORY |
74924dcb RS |
238 | |
239 | ||
240 | /* | |
241 | * The implementation provided here uses a fixed-sized mmap() heap, | |
242 | * which is locked into memory, not written to core files, and protected | |
243 | * on either side by an unmapped page, which will catch pointer overruns | |
244 | * (or underruns) and an attempt to read data out of the secure heap. | |
245 | * Free'd memory is zero'd or otherwise cleansed. | |
246 | * | |
247 | * This is a pretty standard buddy allocator. We keep areas in a multiple | |
248 | * of "sh.minsize" units. The freelist and bitmaps are kept separately, | |
249 | * so all (and only) data is kept in the mmap'd heap. | |
250 | * | |
251 | * This code assumes eight-bit bytes. The numbers 3 and 7 are all over the | |
252 | * place. | |
253 | */ | |
254 | ||
e8408681 TS |
255 | #define ONE ((size_t)1) |
256 | ||
257 | # define TESTBIT(t, b) (t[(b) >> 3] & (ONE << ((b) & 7))) | |
258 | # define SETBIT(t, b) (t[(b) >> 3] |= (ONE << ((b) & 7))) | |
259 | # define CLEARBIT(t, b) (t[(b) >> 3] &= (0xFF & ~(ONE << ((b) & 7)))) | |
74924dcb RS |
260 | |
261 | #define WITHIN_ARENA(p) \ | |
262 | ((char*)(p) >= sh.arena && (char*)(p) < &sh.arena[sh.arena_size]) | |
263 | #define WITHIN_FREELIST(p) \ | |
264 | ((char*)(p) >= (char*)sh.freelist && (char*)(p) < (char*)&sh.freelist[sh.freelist_size]) | |
265 | ||
266 | ||
267 | typedef struct sh_list_st | |
268 | { | |
269 | struct sh_list_st *next; | |
270 | struct sh_list_st **p_next; | |
271 | } SH_LIST; | |
272 | ||
273 | typedef struct sh_st | |
274 | { | |
275 | char* map_result; | |
276 | size_t map_size; | |
277 | char *arena; | |
e8408681 | 278 | size_t arena_size; |
74924dcb | 279 | char **freelist; |
e8408681 TS |
280 | ossl_ssize_t freelist_size; |
281 | size_t minsize; | |
74924dcb RS |
282 | unsigned char *bittable; |
283 | unsigned char *bitmalloc; | |
e8408681 | 284 | size_t bittable_size; /* size in bits */ |
74924dcb RS |
285 | } SH; |
286 | ||
287 | static SH sh; | |
288 | ||
e8408681 | 289 | static size_t sh_getlist(char *ptr) |
74924dcb | 290 | { |
e8408681 TS |
291 | ossl_ssize_t list = sh.freelist_size - 1; |
292 | size_t bit = (sh.arena_size + ptr - sh.arena) / sh.minsize; | |
74924dcb RS |
293 | |
294 | for (; bit; bit >>= 1, list--) { | |
295 | if (TESTBIT(sh.bittable, bit)) | |
296 | break; | |
297 | OPENSSL_assert((bit & 1) == 0); | |
298 | } | |
299 | ||
300 | return list; | |
301 | } | |
302 | ||
303 | ||
304 | static int sh_testbit(char *ptr, int list, unsigned char *table) | |
305 | { | |
e8408681 | 306 | size_t bit; |
74924dcb RS |
307 | |
308 | OPENSSL_assert(list >= 0 && list < sh.freelist_size); | |
309 | OPENSSL_assert(((ptr - sh.arena) & ((sh.arena_size >> list) - 1)) == 0); | |
e8408681 | 310 | bit = (ONE << list) + ((ptr - sh.arena) / (sh.arena_size >> list)); |
74924dcb RS |
311 | OPENSSL_assert(bit > 0 && bit < sh.bittable_size); |
312 | return TESTBIT(table, bit); | |
313 | } | |
314 | ||
315 | static void sh_clearbit(char *ptr, int list, unsigned char *table) | |
316 | { | |
e8408681 | 317 | size_t bit; |
74924dcb RS |
318 | |
319 | OPENSSL_assert(list >= 0 && list < sh.freelist_size); | |
320 | OPENSSL_assert(((ptr - sh.arena) & ((sh.arena_size >> list) - 1)) == 0); | |
e8408681 | 321 | bit = (ONE << list) + ((ptr - sh.arena) / (sh.arena_size >> list)); |
74924dcb RS |
322 | OPENSSL_assert(bit > 0 && bit < sh.bittable_size); |
323 | OPENSSL_assert(TESTBIT(table, bit)); | |
324 | CLEARBIT(table, bit); | |
325 | } | |
326 | ||
327 | static void sh_setbit(char *ptr, int list, unsigned char *table) | |
328 | { | |
e8408681 | 329 | size_t bit; |
74924dcb RS |
330 | |
331 | OPENSSL_assert(list >= 0 && list < sh.freelist_size); | |
332 | OPENSSL_assert(((ptr - sh.arena) & ((sh.arena_size >> list) - 1)) == 0); | |
e8408681 | 333 | bit = (ONE << list) + ((ptr - sh.arena) / (sh.arena_size >> list)); |
74924dcb RS |
334 | OPENSSL_assert(bit > 0 && bit < sh.bittable_size); |
335 | OPENSSL_assert(!TESTBIT(table, bit)); | |
336 | SETBIT(table, bit); | |
337 | } | |
338 | ||
339 | static void sh_add_to_list(char **list, char *ptr) | |
340 | { | |
341 | SH_LIST *temp; | |
342 | ||
343 | OPENSSL_assert(WITHIN_FREELIST(list)); | |
344 | OPENSSL_assert(WITHIN_ARENA(ptr)); | |
345 | ||
346 | temp = (SH_LIST *)ptr; | |
347 | temp->next = *(SH_LIST **)list; | |
348 | OPENSSL_assert(temp->next == NULL || WITHIN_ARENA(temp->next)); | |
349 | temp->p_next = (SH_LIST **)list; | |
350 | ||
351 | if (temp->next != NULL) { | |
352 | OPENSSL_assert((char **)temp->next->p_next == list); | |
353 | temp->next->p_next = &(temp->next); | |
354 | } | |
355 | ||
356 | *list = ptr; | |
357 | } | |
358 | ||
a773b52a | 359 | static void sh_remove_from_list(char *ptr) |
74924dcb RS |
360 | { |
361 | SH_LIST *temp, *temp2; | |
362 | ||
363 | temp = (SH_LIST *)ptr; | |
364 | if (temp->next != NULL) | |
365 | temp->next->p_next = temp->p_next; | |
366 | *temp->p_next = temp->next; | |
367 | if (temp->next == NULL) | |
368 | return; | |
369 | ||
370 | temp2 = temp->next; | |
371 | OPENSSL_assert(WITHIN_FREELIST(temp2->p_next) || WITHIN_ARENA(temp2->p_next)); | |
372 | } | |
373 | ||
374 | ||
34b16762 | 375 | static int sh_init(size_t size, size_t minsize) |
74924dcb | 376 | { |
7031ddac TS |
377 | int ret; |
378 | size_t i; | |
74924dcb RS |
379 | size_t pgsize; |
380 | size_t aligned; | |
381 | ||
cbe29648 | 382 | memset(&sh, 0, sizeof(sh)); |
74924dcb RS |
383 | |
384 | /* make sure size and minsize are powers of 2 */ | |
385 | OPENSSL_assert(size > 0); | |
386 | OPENSSL_assert((size & (size - 1)) == 0); | |
74924dcb RS |
387 | OPENSSL_assert((minsize & (minsize - 1)) == 0); |
388 | if (size <= 0 || (size & (size - 1)) != 0) | |
389 | goto err; | |
34b16762 | 390 | if (minsize == 0 || (minsize & (minsize - 1)) != 0) |
74924dcb RS |
391 | goto err; |
392 | ||
70e14ffb P |
393 | while (minsize < (int)sizeof(SH_LIST)) |
394 | minsize *= 2; | |
395 | ||
74924dcb RS |
396 | sh.arena_size = size; |
397 | sh.minsize = minsize; | |
398 | sh.bittable_size = (sh.arena_size / sh.minsize) * 2; | |
399 | ||
7f07149d GV |
400 | /* Prevent allocations of size 0 later on */ |
401 | if (sh.bittable_size >> 3 == 0) | |
402 | goto err; | |
403 | ||
74924dcb RS |
404 | sh.freelist_size = -1; |
405 | for (i = sh.bittable_size; i; i >>= 1) | |
406 | sh.freelist_size++; | |
407 | ||
cbe29648 | 408 | sh.freelist = OPENSSL_zalloc(sh.freelist_size * sizeof(char *)); |
74924dcb RS |
409 | OPENSSL_assert(sh.freelist != NULL); |
410 | if (sh.freelist == NULL) | |
411 | goto err; | |
74924dcb | 412 | |
b51bce94 | 413 | sh.bittable = OPENSSL_zalloc(sh.bittable_size >> 3); |
74924dcb RS |
414 | OPENSSL_assert(sh.bittable != NULL); |
415 | if (sh.bittable == NULL) | |
416 | goto err; | |
74924dcb | 417 | |
b51bce94 | 418 | sh.bitmalloc = OPENSSL_zalloc(sh.bittable_size >> 3); |
74924dcb RS |
419 | OPENSSL_assert(sh.bitmalloc != NULL); |
420 | if (sh.bitmalloc == NULL) | |
421 | goto err; | |
74924dcb RS |
422 | |
423 | /* Allocate space for heap, and two extra pages as guards */ | |
9ae720b4 MC |
424 | #if defined(_SC_PAGE_SIZE) || defined (_SC_PAGESIZE) |
425 | { | |
426 | # if defined(_SC_PAGE_SIZE) | |
427 | long tmppgsize = sysconf(_SC_PAGE_SIZE); | |
428 | # else | |
429 | long tmppgsize = sysconf(_SC_PAGESIZE); | |
430 | # endif | |
431 | if (tmppgsize < 1) | |
432 | pgsize = PAGE_SIZE; | |
433 | else | |
434 | pgsize = (size_t)tmppgsize; | |
435 | } | |
74924dcb RS |
436 | #else |
437 | pgsize = PAGE_SIZE; | |
438 | #endif | |
439 | sh.map_size = pgsize + sh.arena_size + pgsize; | |
27186da7 AP |
440 | if (1) { |
441 | #ifdef MAP_ANON | |
442 | sh.map_result = mmap(NULL, sh.map_size, | |
443 | PROT_READ|PROT_WRITE, MAP_ANON|MAP_PRIVATE, -1, 0); | |
444 | } else { | |
445 | #endif | |
446 | int fd; | |
447 | ||
448 | sh.map_result = MAP_FAILED; | |
449 | if ((fd = open("/dev/zero", O_RDWR)) >= 0) { | |
450 | sh.map_result = mmap(NULL, sh.map_size, | |
451 | PROT_READ|PROT_WRITE, MAP_PRIVATE, fd, 0); | |
452 | close(fd); | |
453 | } | |
454 | } | |
74924dcb RS |
455 | if (sh.map_result == MAP_FAILED) |
456 | goto err; | |
457 | sh.arena = (char *)(sh.map_result + pgsize); | |
458 | sh_setbit(sh.arena, 0, sh.bittable); | |
459 | sh_add_to_list(&sh.freelist[0], sh.arena); | |
460 | ||
461 | /* Now try to add guard pages and lock into memory. */ | |
462 | ret = 1; | |
463 | ||
464 | /* Starting guard is already aligned from mmap. */ | |
465 | if (mprotect(sh.map_result, pgsize, PROT_NONE) < 0) | |
466 | ret = 2; | |
467 | ||
468 | /* Ending guard page - need to round up to page boundary */ | |
469 | aligned = (pgsize + sh.arena_size + (pgsize - 1)) & ~(pgsize - 1); | |
470 | if (mprotect(sh.map_result + aligned, pgsize, PROT_NONE) < 0) | |
471 | ret = 2; | |
472 | ||
9dfc5b96 TS |
473 | #if defined(OPENSSL_SYS_LINUX) && defined(MLOCK_ONFAULT) && defined(SYS_mlock2) |
474 | if (syscall(SYS_mlock2, sh.arena, sh.arena_size, MLOCK_ONFAULT) < 0) { | |
475 | if (errno == ENOSYS) { | |
476 | if (mlock(sh.arena, sh.arena_size) < 0) | |
477 | ret = 2; | |
478 | } else { | |
479 | ret = 2; | |
480 | } | |
481 | } | |
482 | #else | |
74924dcb RS |
483 | if (mlock(sh.arena, sh.arena_size) < 0) |
484 | ret = 2; | |
9dfc5b96 | 485 | #endif |
74924dcb RS |
486 | #ifdef MADV_DONTDUMP |
487 | if (madvise(sh.arena, sh.arena_size, MADV_DONTDUMP) < 0) | |
488 | ret = 2; | |
489 | #endif | |
490 | ||
491 | return ret; | |
492 | ||
493 | err: | |
494 | sh_done(); | |
495 | return 0; | |
496 | } | |
497 | ||
3cb7c5cf | 498 | static void sh_done(void) |
74924dcb RS |
499 | { |
500 | OPENSSL_free(sh.freelist); | |
501 | OPENSSL_free(sh.bittable); | |
502 | OPENSSL_free(sh.bitmalloc); | |
503 | if (sh.map_result != NULL && sh.map_size) | |
504 | munmap(sh.map_result, sh.map_size); | |
cbe29648 | 505 | memset(&sh, 0, sizeof(sh)); |
74924dcb RS |
506 | } |
507 | ||
508 | static int sh_allocated(const char *ptr) | |
509 | { | |
510 | return WITHIN_ARENA(ptr) ? 1 : 0; | |
511 | } | |
512 | ||
513 | static char *sh_find_my_buddy(char *ptr, int list) | |
514 | { | |
e8408681 | 515 | size_t bit; |
74924dcb RS |
516 | char *chunk = NULL; |
517 | ||
e8408681 | 518 | bit = (ONE << list) + (ptr - sh.arena) / (sh.arena_size >> list); |
74924dcb RS |
519 | bit ^= 1; |
520 | ||
521 | if (TESTBIT(sh.bittable, bit) && !TESTBIT(sh.bitmalloc, bit)) | |
e8408681 | 522 | chunk = sh.arena + ((bit & ((ONE << list) - 1)) * (sh.arena_size >> list)); |
74924dcb RS |
523 | |
524 | return chunk; | |
525 | } | |
526 | ||
332dc4fa | 527 | static void *sh_malloc(size_t size) |
74924dcb | 528 | { |
e8408681 | 529 | ossl_ssize_t list, slist; |
74924dcb RS |
530 | size_t i; |
531 | char *chunk; | |
532 | ||
7031ddac TS |
533 | if (size > sh.arena_size) |
534 | return NULL; | |
535 | ||
74924dcb RS |
536 | list = sh.freelist_size - 1; |
537 | for (i = sh.minsize; i < size; i <<= 1) | |
538 | list--; | |
539 | if (list < 0) | |
540 | return NULL; | |
541 | ||
542 | /* try to find a larger entry to split */ | |
543 | for (slist = list; slist >= 0; slist--) | |
544 | if (sh.freelist[slist] != NULL) | |
545 | break; | |
546 | if (slist < 0) | |
547 | return NULL; | |
548 | ||
549 | /* split larger entry */ | |
550 | while (slist != list) { | |
551 | char *temp = sh.freelist[slist]; | |
552 | ||
553 | /* remove from bigger list */ | |
554 | OPENSSL_assert(!sh_testbit(temp, slist, sh.bitmalloc)); | |
555 | sh_clearbit(temp, slist, sh.bittable); | |
a773b52a | 556 | sh_remove_from_list(temp); |
74924dcb RS |
557 | OPENSSL_assert(temp != sh.freelist[slist]); |
558 | ||
559 | /* done with bigger list */ | |
560 | slist++; | |
561 | ||
562 | /* add to smaller list */ | |
563 | OPENSSL_assert(!sh_testbit(temp, slist, sh.bitmalloc)); | |
564 | sh_setbit(temp, slist, sh.bittable); | |
565 | sh_add_to_list(&sh.freelist[slist], temp); | |
566 | OPENSSL_assert(sh.freelist[slist] == temp); | |
567 | ||
568 | /* split in 2 */ | |
569 | temp += sh.arena_size >> slist; | |
570 | OPENSSL_assert(!sh_testbit(temp, slist, sh.bitmalloc)); | |
571 | sh_setbit(temp, slist, sh.bittable); | |
572 | sh_add_to_list(&sh.freelist[slist], temp); | |
573 | OPENSSL_assert(sh.freelist[slist] == temp); | |
574 | ||
575 | OPENSSL_assert(temp-(sh.arena_size >> slist) == sh_find_my_buddy(temp, slist)); | |
576 | } | |
577 | ||
578 | /* peel off memory to hand back */ | |
579 | chunk = sh.freelist[list]; | |
580 | OPENSSL_assert(sh_testbit(chunk, list, sh.bittable)); | |
581 | sh_setbit(chunk, list, sh.bitmalloc); | |
a773b52a | 582 | sh_remove_from_list(chunk); |
74924dcb RS |
583 | |
584 | OPENSSL_assert(WITHIN_ARENA(chunk)); | |
585 | ||
3b8e97ab P |
586 | /* zero the free list header as a precaution against information leakage */ |
587 | memset(chunk, 0, sizeof(SH_LIST)); | |
588 | ||
74924dcb RS |
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 | ||
3b8e97ab P |
621 | /* Zero the higher addressed block's free list pointers */ |
622 | memset(ptr > buddy ? ptr : buddy, 0, sizeof(SH_LIST)); | |
74924dcb RS |
623 | if (ptr > buddy) |
624 | ptr = buddy; | |
625 | ||
626 | OPENSSL_assert(!sh_testbit(ptr, list, sh.bitmalloc)); | |
627 | sh_setbit(ptr, list, sh.bittable); | |
628 | sh_add_to_list(&sh.freelist[list], ptr); | |
629 | OPENSSL_assert(sh.freelist[list] == ptr); | |
630 | } | |
631 | } | |
632 | ||
e8408681 | 633 | static size_t sh_actual_size(char *ptr) |
74924dcb RS |
634 | { |
635 | int list; | |
636 | ||
637 | OPENSSL_assert(WITHIN_ARENA(ptr)); | |
638 | if (!WITHIN_ARENA(ptr)) | |
639 | return 0; | |
640 | list = sh_getlist(ptr); | |
641 | OPENSSL_assert(sh_testbit(ptr, list, sh.bittable)); | |
e8408681 | 642 | return sh.arena_size / (ONE << list); |
74924dcb | 643 | } |
6943335e | 644 | #endif /* OPENSSL_NO_SECURE_MEMORY */ |