Harald Welte | 5df0be6 | 2019-04-17 20:54:29 +0200 | [diff] [blame] | 1 | /* |
| 2 | Samba Unix SMB/CIFS implementation. |
| 3 | |
| 4 | Samba trivial allocation library - new interface |
| 5 | |
| 6 | NOTE: Please read talloc_guide.txt for full documentation |
| 7 | |
| 8 | Copyright (C) Andrew Tridgell 2004 |
| 9 | Copyright (C) Stefan Metzmacher 2006 |
| 10 | |
| 11 | ** NOTE! The following LGPL license applies to the talloc |
| 12 | ** library. This does NOT imply that all of Samba is released |
| 13 | ** under the LGPL |
| 14 | |
| 15 | This library is free software; you can redistribute it and/or |
| 16 | modify it under the terms of the GNU Lesser General Public |
| 17 | License as published by the Free Software Foundation; either |
| 18 | version 3 of the License, or (at your option) any later version. |
| 19 | |
| 20 | This library is distributed in the hope that it will be useful, |
| 21 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 22 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 23 | Lesser General Public License for more details. |
| 24 | |
| 25 | You should have received a copy of the GNU Lesser General Public |
| 26 | License along with this library; if not, see <http://www.gnu.org/licenses/>. |
| 27 | */ |
| 28 | |
| 29 | /* |
| 30 | inspired by http://swapped.cc/halloc/ |
| 31 | */ |
| 32 | |
| 33 | #include "replace.h" |
| 34 | #include "talloc.h" |
| 35 | |
| 36 | #ifdef HAVE_SYS_AUXV_H |
| 37 | #include <sys/auxv.h> |
| 38 | #endif |
| 39 | |
| 40 | #if (TALLOC_VERSION_MAJOR != TALLOC_BUILD_VERSION_MAJOR) |
| 41 | #error "TALLOC_VERSION_MAJOR != TALLOC_BUILD_VERSION_MAJOR" |
| 42 | #endif |
| 43 | |
| 44 | #if (TALLOC_VERSION_MINOR != TALLOC_BUILD_VERSION_MINOR) |
| 45 | #error "TALLOC_VERSION_MINOR != TALLOC_BUILD_VERSION_MINOR" |
| 46 | #endif |
| 47 | |
| 48 | /* Special macros that are no-ops except when run under Valgrind on |
| 49 | * x86. They've moved a little bit from valgrind 1.0.4 to 1.9.4 */ |
| 50 | #ifdef HAVE_VALGRIND_MEMCHECK_H |
| 51 | /* memcheck.h includes valgrind.h */ |
| 52 | #include <valgrind/memcheck.h> |
| 53 | #elif defined(HAVE_VALGRIND_H) |
| 54 | #include <valgrind.h> |
| 55 | #endif |
| 56 | |
| 57 | /* use this to force every realloc to change the pointer, to stress test |
| 58 | code that might not cope */ |
| 59 | #define ALWAYS_REALLOC 0 |
| 60 | |
| 61 | |
| 62 | #define MAX_TALLOC_SIZE 0x10000000 |
| 63 | |
| 64 | #define TALLOC_FLAG_FREE 0x01 |
| 65 | #define TALLOC_FLAG_LOOP 0x02 |
| 66 | #define TALLOC_FLAG_POOL 0x04 /* This is a talloc pool */ |
| 67 | #define TALLOC_FLAG_POOLMEM 0x08 /* This is allocated in a pool */ |
| 68 | |
| 69 | /* |
| 70 | * Bits above this are random, used to make it harder to fake talloc |
| 71 | * headers during an attack. Try not to change this without good reason. |
| 72 | */ |
| 73 | #define TALLOC_FLAG_MASK 0x0F |
| 74 | |
| 75 | #define TALLOC_MAGIC_REFERENCE ((const char *)1) |
| 76 | |
| 77 | #define TALLOC_MAGIC_BASE 0xe814ec70 |
| 78 | #define TALLOC_MAGIC_NON_RANDOM ( \ |
| 79 | ~TALLOC_FLAG_MASK & ( \ |
| 80 | TALLOC_MAGIC_BASE + \ |
| 81 | (TALLOC_BUILD_VERSION_MAJOR << 24) + \ |
| 82 | (TALLOC_BUILD_VERSION_MINOR << 16) + \ |
| 83 | (TALLOC_BUILD_VERSION_RELEASE << 8))) |
| 84 | static unsigned int talloc_magic = TALLOC_MAGIC_NON_RANDOM; |
| 85 | |
| 86 | /* by default we abort when given a bad pointer (such as when talloc_free() is called |
| 87 | on a pointer that came from malloc() */ |
| 88 | #ifndef TALLOC_ABORT |
| 89 | #define TALLOC_ABORT(reason) abort() |
| 90 | #endif |
| 91 | |
| 92 | #ifndef discard_const_p |
| 93 | #if defined(__intptr_t_defined) || defined(HAVE_INTPTR_T) |
| 94 | # define discard_const_p(type, ptr) ((type *)((intptr_t)(ptr))) |
| 95 | #else |
| 96 | # define discard_const_p(type, ptr) ((type *)(ptr)) |
| 97 | #endif |
| 98 | #endif |
| 99 | |
| 100 | /* these macros gain us a few percent of speed on gcc */ |
| 101 | #if (__GNUC__ >= 3) |
| 102 | /* the strange !! is to ensure that __builtin_expect() takes either 0 or 1 |
| 103 | as its first argument */ |
| 104 | #ifndef likely |
| 105 | #define likely(x) __builtin_expect(!!(x), 1) |
| 106 | #endif |
| 107 | #ifndef unlikely |
| 108 | #define unlikely(x) __builtin_expect(!!(x), 0) |
| 109 | #endif |
| 110 | #else |
| 111 | #ifndef likely |
| 112 | #define likely(x) (x) |
| 113 | #endif |
| 114 | #ifndef unlikely |
| 115 | #define unlikely(x) (x) |
| 116 | #endif |
| 117 | #endif |
| 118 | |
| 119 | /* this null_context is only used if talloc_enable_leak_report() or |
| 120 | talloc_enable_leak_report_full() is called, otherwise it remains |
| 121 | NULL |
| 122 | */ |
| 123 | static void *null_context; |
| 124 | static bool talloc_report_null; |
| 125 | static bool talloc_report_null_full; |
| 126 | static void *autofree_context; |
| 127 | |
| 128 | static void talloc_setup_atexit(void); |
| 129 | |
| 130 | /* used to enable fill of memory on free, which can be useful for |
| 131 | * catching use after free errors when valgrind is too slow |
| 132 | */ |
| 133 | static struct { |
| 134 | bool initialised; |
| 135 | bool enabled; |
| 136 | uint8_t fill_value; |
| 137 | } talloc_fill; |
| 138 | |
| 139 | #define TALLOC_FILL_ENV "TALLOC_FREE_FILL" |
| 140 | |
| 141 | /* |
| 142 | * do not wipe the header, to allow the |
| 143 | * double-free logic to still work |
| 144 | */ |
| 145 | #define TC_INVALIDATE_FULL_FILL_CHUNK(_tc) do { \ |
| 146 | if (unlikely(talloc_fill.enabled)) { \ |
| 147 | size_t _flen = (_tc)->size; \ |
| 148 | char *_fptr = (char *)TC_PTR_FROM_CHUNK(_tc); \ |
| 149 | memset(_fptr, talloc_fill.fill_value, _flen); \ |
| 150 | } \ |
| 151 | } while (0) |
| 152 | |
| 153 | #if defined(DEVELOPER) && defined(VALGRIND_MAKE_MEM_NOACCESS) |
| 154 | /* Mark the whole chunk as not accessable */ |
| 155 | #define TC_INVALIDATE_FULL_VALGRIND_CHUNK(_tc) do { \ |
| 156 | size_t _flen = TC_HDR_SIZE + (_tc)->size; \ |
| 157 | char *_fptr = (char *)(_tc); \ |
| 158 | VALGRIND_MAKE_MEM_NOACCESS(_fptr, _flen); \ |
| 159 | } while(0) |
| 160 | #else |
| 161 | #define TC_INVALIDATE_FULL_VALGRIND_CHUNK(_tc) do { } while (0) |
| 162 | #endif |
| 163 | |
| 164 | #define TC_INVALIDATE_FULL_CHUNK(_tc) do { \ |
| 165 | TC_INVALIDATE_FULL_FILL_CHUNK(_tc); \ |
| 166 | TC_INVALIDATE_FULL_VALGRIND_CHUNK(_tc); \ |
| 167 | } while (0) |
| 168 | |
| 169 | #define TC_INVALIDATE_SHRINK_FILL_CHUNK(_tc, _new_size) do { \ |
| 170 | if (unlikely(talloc_fill.enabled)) { \ |
| 171 | size_t _flen = (_tc)->size - (_new_size); \ |
| 172 | char *_fptr = (char *)TC_PTR_FROM_CHUNK(_tc); \ |
| 173 | _fptr += (_new_size); \ |
| 174 | memset(_fptr, talloc_fill.fill_value, _flen); \ |
| 175 | } \ |
| 176 | } while (0) |
| 177 | |
| 178 | #if defined(DEVELOPER) && defined(VALGRIND_MAKE_MEM_NOACCESS) |
| 179 | /* Mark the unused bytes not accessable */ |
| 180 | #define TC_INVALIDATE_SHRINK_VALGRIND_CHUNK(_tc, _new_size) do { \ |
| 181 | size_t _flen = (_tc)->size - (_new_size); \ |
| 182 | char *_fptr = (char *)TC_PTR_FROM_CHUNK(_tc); \ |
| 183 | _fptr += (_new_size); \ |
| 184 | VALGRIND_MAKE_MEM_NOACCESS(_fptr, _flen); \ |
| 185 | } while (0) |
| 186 | #else |
| 187 | #define TC_INVALIDATE_SHRINK_VALGRIND_CHUNK(_tc, _new_size) do { } while (0) |
| 188 | #endif |
| 189 | |
| 190 | #define TC_INVALIDATE_SHRINK_CHUNK(_tc, _new_size) do { \ |
| 191 | TC_INVALIDATE_SHRINK_FILL_CHUNK(_tc, _new_size); \ |
| 192 | TC_INVALIDATE_SHRINK_VALGRIND_CHUNK(_tc, _new_size); \ |
| 193 | } while (0) |
| 194 | |
| 195 | #define TC_UNDEFINE_SHRINK_FILL_CHUNK(_tc, _new_size) do { \ |
| 196 | if (unlikely(talloc_fill.enabled)) { \ |
| 197 | size_t _flen = (_tc)->size - (_new_size); \ |
| 198 | char *_fptr = (char *)TC_PTR_FROM_CHUNK(_tc); \ |
| 199 | _fptr += (_new_size); \ |
| 200 | memset(_fptr, talloc_fill.fill_value, _flen); \ |
| 201 | } \ |
| 202 | } while (0) |
| 203 | |
| 204 | #if defined(DEVELOPER) && defined(VALGRIND_MAKE_MEM_UNDEFINED) |
| 205 | /* Mark the unused bytes as undefined */ |
| 206 | #define TC_UNDEFINE_SHRINK_VALGRIND_CHUNK(_tc, _new_size) do { \ |
| 207 | size_t _flen = (_tc)->size - (_new_size); \ |
| 208 | char *_fptr = (char *)TC_PTR_FROM_CHUNK(_tc); \ |
| 209 | _fptr += (_new_size); \ |
| 210 | VALGRIND_MAKE_MEM_UNDEFINED(_fptr, _flen); \ |
| 211 | } while (0) |
| 212 | #else |
| 213 | #define TC_UNDEFINE_SHRINK_VALGRIND_CHUNK(_tc, _new_size) do { } while (0) |
| 214 | #endif |
| 215 | |
| 216 | #define TC_UNDEFINE_SHRINK_CHUNK(_tc, _new_size) do { \ |
| 217 | TC_UNDEFINE_SHRINK_FILL_CHUNK(_tc, _new_size); \ |
| 218 | TC_UNDEFINE_SHRINK_VALGRIND_CHUNK(_tc, _new_size); \ |
| 219 | } while (0) |
| 220 | |
| 221 | #if defined(DEVELOPER) && defined(VALGRIND_MAKE_MEM_UNDEFINED) |
| 222 | /* Mark the new bytes as undefined */ |
| 223 | #define TC_UNDEFINE_GROW_VALGRIND_CHUNK(_tc, _new_size) do { \ |
| 224 | size_t _old_used = TC_HDR_SIZE + (_tc)->size; \ |
| 225 | size_t _new_used = TC_HDR_SIZE + (_new_size); \ |
| 226 | size_t _flen = _new_used - _old_used; \ |
| 227 | char *_fptr = _old_used + (char *)(_tc); \ |
| 228 | VALGRIND_MAKE_MEM_UNDEFINED(_fptr, _flen); \ |
| 229 | } while (0) |
| 230 | #else |
| 231 | #define TC_UNDEFINE_GROW_VALGRIND_CHUNK(_tc, _new_size) do { } while (0) |
| 232 | #endif |
| 233 | |
| 234 | #define TC_UNDEFINE_GROW_CHUNK(_tc, _new_size) do { \ |
| 235 | TC_UNDEFINE_GROW_VALGRIND_CHUNK(_tc, _new_size); \ |
| 236 | } while (0) |
| 237 | |
| 238 | struct talloc_reference_handle { |
| 239 | struct talloc_reference_handle *next, *prev; |
| 240 | void *ptr; |
| 241 | const char *location; |
| 242 | }; |
| 243 | |
| 244 | struct talloc_memlimit { |
| 245 | struct talloc_chunk *parent; |
| 246 | struct talloc_memlimit *upper; |
| 247 | size_t max_size; |
| 248 | size_t cur_size; |
| 249 | }; |
| 250 | |
| 251 | static inline bool talloc_memlimit_check(struct talloc_memlimit *limit, size_t size); |
| 252 | static inline void talloc_memlimit_grow(struct talloc_memlimit *limit, |
| 253 | size_t size); |
| 254 | static inline void talloc_memlimit_shrink(struct talloc_memlimit *limit, |
| 255 | size_t size); |
| 256 | static inline void tc_memlimit_update_on_free(struct talloc_chunk *tc); |
| 257 | |
| 258 | static inline void _tc_set_name_const(struct talloc_chunk *tc, |
| 259 | const char *name); |
| 260 | static struct talloc_chunk *_vasprintf_tc(const void *t, |
| 261 | const char *fmt, |
| 262 | va_list ap); |
| 263 | |
| 264 | typedef int (*talloc_destructor_t)(void *); |
| 265 | |
| 266 | struct talloc_pool_hdr; |
| 267 | |
| 268 | struct talloc_chunk { |
| 269 | /* |
| 270 | * flags includes the talloc magic, which is randomised to |
| 271 | * make overwrite attacks harder |
| 272 | */ |
| 273 | unsigned flags; |
| 274 | |
| 275 | /* |
| 276 | * If you have a logical tree like: |
| 277 | * |
| 278 | * <parent> |
| 279 | * / | \ |
| 280 | * / | \ |
| 281 | * / | \ |
| 282 | * <child 1> <child 2> <child 3> |
| 283 | * |
| 284 | * The actual talloc tree is: |
| 285 | * |
| 286 | * <parent> |
| 287 | * | |
| 288 | * <child 1> - <child 2> - <child 3> |
| 289 | * |
| 290 | * The children are linked with next/prev pointers, and |
| 291 | * child 1 is linked to the parent with parent/child |
| 292 | * pointers. |
| 293 | */ |
| 294 | |
| 295 | struct talloc_chunk *next, *prev; |
| 296 | struct talloc_chunk *parent, *child; |
| 297 | struct talloc_reference_handle *refs; |
| 298 | talloc_destructor_t destructor; |
| 299 | const char *name; |
| 300 | size_t size; |
| 301 | |
| 302 | /* |
| 303 | * limit semantics: |
| 304 | * if 'limit' is set it means all *new* children of the context will |
| 305 | * be limited to a total aggregate size ox max_size for memory |
| 306 | * allocations. |
| 307 | * cur_size is used to keep track of the current use |
| 308 | */ |
| 309 | struct talloc_memlimit *limit; |
| 310 | |
| 311 | /* |
| 312 | * For members of a pool (i.e. TALLOC_FLAG_POOLMEM is set), "pool" |
| 313 | * is a pointer to the struct talloc_chunk of the pool that it was |
| 314 | * allocated from. This way children can quickly find the pool to chew |
| 315 | * from. |
| 316 | */ |
| 317 | struct talloc_pool_hdr *pool; |
| 318 | }; |
| 319 | |
| 320 | /* 16 byte alignment seems to keep everyone happy */ |
| 321 | #define TC_ALIGN16(s) (((s)+15)&~15) |
| 322 | #define TC_HDR_SIZE TC_ALIGN16(sizeof(struct talloc_chunk)) |
| 323 | #define TC_PTR_FROM_CHUNK(tc) ((void *)(TC_HDR_SIZE + (char*)tc)) |
| 324 | |
| 325 | _PUBLIC_ int talloc_version_major(void) |
| 326 | { |
| 327 | return TALLOC_VERSION_MAJOR; |
| 328 | } |
| 329 | |
| 330 | _PUBLIC_ int talloc_version_minor(void) |
| 331 | { |
| 332 | return TALLOC_VERSION_MINOR; |
| 333 | } |
| 334 | |
| 335 | _PUBLIC_ int talloc_test_get_magic(void) |
| 336 | { |
| 337 | return talloc_magic; |
| 338 | } |
| 339 | |
| 340 | static inline void _talloc_chunk_set_free(struct talloc_chunk *tc, |
| 341 | const char *location) |
| 342 | { |
| 343 | /* |
| 344 | * Mark this memory as free, and also over-stamp the talloc |
| 345 | * magic with the old-style magic. |
| 346 | * |
| 347 | * Why? This tries to avoid a memory read use-after-free from |
| 348 | * disclosing our talloc magic, which would then allow an |
| 349 | * attacker to prepare a valid header and so run a destructor. |
| 350 | * |
| 351 | */ |
| 352 | tc->flags = TALLOC_MAGIC_NON_RANDOM | TALLOC_FLAG_FREE |
| 353 | | (tc->flags & TALLOC_FLAG_MASK); |
| 354 | |
| 355 | /* we mark the freed memory with where we called the free |
| 356 | * from. This means on a double free error we can report where |
| 357 | * the first free came from |
| 358 | */ |
| 359 | if (location) { |
| 360 | tc->name = location; |
| 361 | } |
| 362 | } |
| 363 | |
| 364 | static inline void _talloc_chunk_set_not_free(struct talloc_chunk *tc) |
| 365 | { |
| 366 | /* |
| 367 | * Mark this memory as not free. |
| 368 | * |
| 369 | * Why? This is memory either in a pool (and so available for |
| 370 | * talloc's re-use or after the realloc(). We need to mark |
| 371 | * the memory as free() before any realloc() call as we can't |
| 372 | * write to the memory after that. |
| 373 | * |
| 374 | * We put back the normal magic instead of the 'not random' |
| 375 | * magic. |
| 376 | */ |
| 377 | |
| 378 | tc->flags = talloc_magic | |
| 379 | ((tc->flags & TALLOC_FLAG_MASK) & ~TALLOC_FLAG_FREE); |
| 380 | } |
| 381 | |
| 382 | static void (*talloc_log_fn)(const char *message); |
| 383 | |
| 384 | _PUBLIC_ void talloc_set_log_fn(void (*log_fn)(const char *message)) |
| 385 | { |
| 386 | talloc_log_fn = log_fn; |
| 387 | } |
| 388 | |
| 389 | #ifdef HAVE_CONSTRUCTOR_ATTRIBUTE |
| 390 | void talloc_lib_init(void) __attribute__((constructor)); |
| 391 | void talloc_lib_init(void) |
| 392 | { |
| 393 | uint32_t random_value; |
| 394 | #if defined(HAVE_GETAUXVAL) && defined(AT_RANDOM) |
| 395 | uint8_t *p; |
| 396 | /* |
| 397 | * Use the kernel-provided random values used for |
| 398 | * ASLR. This won't change per-exec, which is ideal for us |
| 399 | */ |
| 400 | p = (uint8_t *) getauxval(AT_RANDOM); |
| 401 | if (p) { |
| 402 | /* |
| 403 | * We get 16 bytes from getauxval. By calling rand(), |
| 404 | * a totally insecure PRNG, but one that will |
| 405 | * deterministically have a different value when called |
| 406 | * twice, we ensure that if two talloc-like libraries |
| 407 | * are somehow loaded in the same address space, that |
| 408 | * because we choose different bytes, we will keep the |
| 409 | * protection against collision of multiple talloc |
| 410 | * libs. |
| 411 | * |
| 412 | * This protection is important because the effects of |
| 413 | * passing a talloc pointer from one to the other may |
| 414 | * be very hard to determine. |
| 415 | */ |
| 416 | int offset = rand() % (16 - sizeof(random_value)); |
| 417 | memcpy(&random_value, p + offset, sizeof(random_value)); |
| 418 | } else |
| 419 | #endif |
| 420 | { |
| 421 | /* |
| 422 | * Otherwise, hope the location we are loaded in |
| 423 | * memory is randomised by someone else |
| 424 | */ |
| 425 | random_value = ((uintptr_t)talloc_lib_init & 0xFFFFFFFF); |
| 426 | } |
| 427 | talloc_magic = random_value & ~TALLOC_FLAG_MASK; |
| 428 | } |
| 429 | #else |
| 430 | #warning "No __attribute__((constructor)) support found on this platform, additional talloc security measures not available" |
| 431 | #endif |
| 432 | |
| 433 | static void talloc_lib_atexit(void) |
| 434 | { |
| 435 | TALLOC_FREE(autofree_context); |
| 436 | |
| 437 | if (talloc_total_size(null_context) == 0) { |
| 438 | return; |
| 439 | } |
| 440 | |
| 441 | if (talloc_report_null_full) { |
| 442 | talloc_report_full(null_context, stderr); |
| 443 | } else if (talloc_report_null) { |
| 444 | talloc_report(null_context, stderr); |
| 445 | } |
| 446 | } |
| 447 | |
| 448 | static void talloc_setup_atexit(void) |
| 449 | { |
| 450 | static bool done; |
| 451 | |
| 452 | if (done) { |
| 453 | return; |
| 454 | } |
| 455 | |
| 456 | atexit(talloc_lib_atexit); |
| 457 | done = true; |
| 458 | } |
| 459 | |
| 460 | static void talloc_log(const char *fmt, ...) PRINTF_ATTRIBUTE(1,2); |
| 461 | static void talloc_log(const char *fmt, ...) |
| 462 | { |
| 463 | va_list ap; |
| 464 | char *message; |
| 465 | |
| 466 | if (!talloc_log_fn) { |
| 467 | return; |
| 468 | } |
| 469 | |
| 470 | va_start(ap, fmt); |
| 471 | message = talloc_vasprintf(NULL, fmt, ap); |
| 472 | va_end(ap); |
| 473 | |
| 474 | talloc_log_fn(message); |
| 475 | talloc_free(message); |
| 476 | } |
| 477 | |
| 478 | static void talloc_log_stderr(const char *message) |
| 479 | { |
| 480 | fprintf(stderr, "%s", message); |
| 481 | } |
| 482 | |
| 483 | _PUBLIC_ void talloc_set_log_stderr(void) |
| 484 | { |
| 485 | talloc_set_log_fn(talloc_log_stderr); |
| 486 | } |
| 487 | |
| 488 | static void (*talloc_abort_fn)(const char *reason); |
| 489 | |
| 490 | _PUBLIC_ void talloc_set_abort_fn(void (*abort_fn)(const char *reason)) |
| 491 | { |
| 492 | talloc_abort_fn = abort_fn; |
| 493 | } |
| 494 | |
| 495 | static void talloc_abort(const char *reason) |
| 496 | { |
Harald Welte | 189f43d | 2019-04-17 21:19:04 +0200 | [diff] [blame] | 497 | talloc_log("%s\r\n", reason); |
Harald Welte | 5df0be6 | 2019-04-17 20:54:29 +0200 | [diff] [blame] | 498 | |
| 499 | if (!talloc_abort_fn) { |
| 500 | TALLOC_ABORT(reason); |
| 501 | } |
| 502 | |
| 503 | talloc_abort_fn(reason); |
| 504 | } |
| 505 | |
| 506 | static void talloc_abort_access_after_free(void) |
| 507 | { |
| 508 | talloc_abort("Bad talloc magic value - access after free"); |
| 509 | } |
| 510 | |
| 511 | static void talloc_abort_unknown_value(void) |
| 512 | { |
| 513 | talloc_abort("Bad talloc magic value - unknown value"); |
| 514 | } |
| 515 | |
| 516 | /* panic if we get a bad magic value */ |
| 517 | static inline struct talloc_chunk *talloc_chunk_from_ptr(const void *ptr) |
| 518 | { |
| 519 | const char *pp = (const char *)ptr; |
| 520 | struct talloc_chunk *tc = discard_const_p(struct talloc_chunk, pp - TC_HDR_SIZE); |
| 521 | if (unlikely((tc->flags & (TALLOC_FLAG_FREE | ~TALLOC_FLAG_MASK)) != talloc_magic)) { |
| 522 | if ((tc->flags & (TALLOC_FLAG_FREE | ~TALLOC_FLAG_MASK)) |
| 523 | == (TALLOC_MAGIC_NON_RANDOM | TALLOC_FLAG_FREE)) { |
Harald Welte | 189f43d | 2019-04-17 21:19:04 +0200 | [diff] [blame] | 524 | talloc_log("talloc: access after free error - first free may be at %s\r\n", tc->name); |
Harald Welte | 5df0be6 | 2019-04-17 20:54:29 +0200 | [diff] [blame] | 525 | talloc_abort_access_after_free(); |
| 526 | return NULL; |
| 527 | } |
| 528 | |
| 529 | talloc_abort_unknown_value(); |
| 530 | return NULL; |
| 531 | } |
| 532 | return tc; |
| 533 | } |
| 534 | |
| 535 | /* hook into the front of the list */ |
| 536 | #define _TLIST_ADD(list, p) \ |
| 537 | do { \ |
| 538 | if (!(list)) { \ |
| 539 | (list) = (p); \ |
| 540 | (p)->next = (p)->prev = NULL; \ |
| 541 | } else { \ |
| 542 | (list)->prev = (p); \ |
| 543 | (p)->next = (list); \ |
| 544 | (p)->prev = NULL; \ |
| 545 | (list) = (p); \ |
| 546 | }\ |
| 547 | } while (0) |
| 548 | |
| 549 | /* remove an element from a list - element doesn't have to be in list. */ |
| 550 | #define _TLIST_REMOVE(list, p) \ |
| 551 | do { \ |
| 552 | if ((p) == (list)) { \ |
| 553 | (list) = (p)->next; \ |
| 554 | if (list) (list)->prev = NULL; \ |
| 555 | } else { \ |
| 556 | if ((p)->prev) (p)->prev->next = (p)->next; \ |
| 557 | if ((p)->next) (p)->next->prev = (p)->prev; \ |
| 558 | } \ |
| 559 | if ((p) && ((p) != (list))) (p)->next = (p)->prev = NULL; \ |
| 560 | } while (0) |
| 561 | |
| 562 | |
| 563 | /* |
| 564 | return the parent chunk of a pointer |
| 565 | */ |
| 566 | static inline struct talloc_chunk *talloc_parent_chunk(const void *ptr) |
| 567 | { |
| 568 | struct talloc_chunk *tc; |
| 569 | |
| 570 | if (unlikely(ptr == NULL)) { |
| 571 | return NULL; |
| 572 | } |
| 573 | |
| 574 | tc = talloc_chunk_from_ptr(ptr); |
| 575 | while (tc->prev) tc=tc->prev; |
| 576 | |
| 577 | return tc->parent; |
| 578 | } |
| 579 | |
| 580 | _PUBLIC_ void *talloc_parent(const void *ptr) |
| 581 | { |
| 582 | struct talloc_chunk *tc = talloc_parent_chunk(ptr); |
| 583 | return tc? TC_PTR_FROM_CHUNK(tc) : NULL; |
| 584 | } |
| 585 | |
| 586 | /* |
| 587 | find parents name |
| 588 | */ |
| 589 | _PUBLIC_ const char *talloc_parent_name(const void *ptr) |
| 590 | { |
| 591 | struct talloc_chunk *tc = talloc_parent_chunk(ptr); |
| 592 | return tc? tc->name : NULL; |
| 593 | } |
| 594 | |
| 595 | /* |
| 596 | A pool carries an in-pool object count count in the first 16 bytes. |
| 597 | bytes. This is done to support talloc_steal() to a parent outside of the |
| 598 | pool. The count includes the pool itself, so a talloc_free() on a pool will |
| 599 | only destroy the pool if the count has dropped to zero. A talloc_free() of a |
| 600 | pool member will reduce the count, and eventually also call free(3) on the |
| 601 | pool memory. |
| 602 | |
| 603 | The object count is not put into "struct talloc_chunk" because it is only |
| 604 | relevant for talloc pools and the alignment to 16 bytes would increase the |
| 605 | memory footprint of each talloc chunk by those 16 bytes. |
| 606 | */ |
| 607 | |
| 608 | struct talloc_pool_hdr { |
| 609 | void *end; |
| 610 | unsigned int object_count; |
| 611 | size_t poolsize; |
| 612 | }; |
| 613 | |
| 614 | #define TP_HDR_SIZE TC_ALIGN16(sizeof(struct talloc_pool_hdr)) |
| 615 | |
| 616 | static inline struct talloc_pool_hdr *talloc_pool_from_chunk(struct talloc_chunk *c) |
| 617 | { |
| 618 | return (struct talloc_pool_hdr *)((char *)c - TP_HDR_SIZE); |
| 619 | } |
| 620 | |
| 621 | static inline struct talloc_chunk *talloc_chunk_from_pool(struct talloc_pool_hdr *h) |
| 622 | { |
| 623 | return (struct talloc_chunk *)((char *)h + TP_HDR_SIZE); |
| 624 | } |
| 625 | |
| 626 | static inline void *tc_pool_end(struct talloc_pool_hdr *pool_hdr) |
| 627 | { |
| 628 | struct talloc_chunk *tc = talloc_chunk_from_pool(pool_hdr); |
| 629 | return (char *)tc + TC_HDR_SIZE + pool_hdr->poolsize; |
| 630 | } |
| 631 | |
| 632 | static inline size_t tc_pool_space_left(struct talloc_pool_hdr *pool_hdr) |
| 633 | { |
| 634 | return (char *)tc_pool_end(pool_hdr) - (char *)pool_hdr->end; |
| 635 | } |
| 636 | |
| 637 | /* If tc is inside a pool, this gives the next neighbour. */ |
| 638 | static inline void *tc_next_chunk(struct talloc_chunk *tc) |
| 639 | { |
| 640 | return (char *)tc + TC_ALIGN16(TC_HDR_SIZE + tc->size); |
| 641 | } |
| 642 | |
| 643 | static inline void *tc_pool_first_chunk(struct talloc_pool_hdr *pool_hdr) |
| 644 | { |
| 645 | struct talloc_chunk *tc = talloc_chunk_from_pool(pool_hdr); |
| 646 | return tc_next_chunk(tc); |
| 647 | } |
| 648 | |
| 649 | /* Mark the whole remaining pool as not accessable */ |
| 650 | static inline void tc_invalidate_pool(struct talloc_pool_hdr *pool_hdr) |
| 651 | { |
| 652 | size_t flen = tc_pool_space_left(pool_hdr); |
| 653 | |
| 654 | if (unlikely(talloc_fill.enabled)) { |
| 655 | memset(pool_hdr->end, talloc_fill.fill_value, flen); |
| 656 | } |
| 657 | |
| 658 | #if defined(DEVELOPER) && defined(VALGRIND_MAKE_MEM_NOACCESS) |
| 659 | VALGRIND_MAKE_MEM_NOACCESS(pool_hdr->end, flen); |
| 660 | #endif |
| 661 | } |
| 662 | |
| 663 | /* |
| 664 | Allocate from a pool |
| 665 | */ |
| 666 | |
| 667 | static inline struct talloc_chunk *tc_alloc_pool(struct talloc_chunk *parent, |
| 668 | size_t size, size_t prefix_len) |
| 669 | { |
| 670 | struct talloc_pool_hdr *pool_hdr = NULL; |
| 671 | size_t space_left; |
| 672 | struct talloc_chunk *result; |
| 673 | size_t chunk_size; |
| 674 | |
| 675 | if (parent == NULL) { |
| 676 | return NULL; |
| 677 | } |
| 678 | |
| 679 | if (parent->flags & TALLOC_FLAG_POOL) { |
| 680 | pool_hdr = talloc_pool_from_chunk(parent); |
| 681 | } |
| 682 | else if (parent->flags & TALLOC_FLAG_POOLMEM) { |
| 683 | pool_hdr = parent->pool; |
| 684 | } |
| 685 | |
| 686 | if (pool_hdr == NULL) { |
| 687 | return NULL; |
| 688 | } |
| 689 | |
| 690 | space_left = tc_pool_space_left(pool_hdr); |
| 691 | |
| 692 | /* |
| 693 | * Align size to 16 bytes |
| 694 | */ |
| 695 | chunk_size = TC_ALIGN16(size + prefix_len); |
| 696 | |
| 697 | if (space_left < chunk_size) { |
| 698 | return NULL; |
| 699 | } |
| 700 | |
| 701 | result = (struct talloc_chunk *)((char *)pool_hdr->end + prefix_len); |
| 702 | |
| 703 | #if defined(DEVELOPER) && defined(VALGRIND_MAKE_MEM_UNDEFINED) |
| 704 | VALGRIND_MAKE_MEM_UNDEFINED(pool_hdr->end, chunk_size); |
| 705 | #endif |
| 706 | |
| 707 | pool_hdr->end = (void *)((char *)pool_hdr->end + chunk_size); |
| 708 | |
| 709 | result->flags = talloc_magic | TALLOC_FLAG_POOLMEM; |
| 710 | result->pool = pool_hdr; |
| 711 | |
| 712 | pool_hdr->object_count++; |
| 713 | |
| 714 | return result; |
| 715 | } |
| 716 | |
| 717 | /* |
| 718 | Allocate a bit of memory as a child of an existing pointer |
| 719 | */ |
| 720 | static inline void *__talloc_with_prefix(const void *context, |
| 721 | size_t size, |
| 722 | size_t prefix_len, |
| 723 | struct talloc_chunk **tc_ret) |
| 724 | { |
| 725 | struct talloc_chunk *tc = NULL; |
| 726 | struct talloc_memlimit *limit = NULL; |
| 727 | size_t total_len = TC_HDR_SIZE + size + prefix_len; |
| 728 | struct talloc_chunk *parent = NULL; |
| 729 | |
| 730 | if (unlikely(context == NULL)) { |
| 731 | context = null_context; |
| 732 | } |
| 733 | |
| 734 | if (unlikely(size >= MAX_TALLOC_SIZE)) { |
| 735 | return NULL; |
| 736 | } |
| 737 | |
| 738 | if (unlikely(total_len < TC_HDR_SIZE)) { |
| 739 | return NULL; |
| 740 | } |
| 741 | |
| 742 | if (likely(context != NULL)) { |
| 743 | parent = talloc_chunk_from_ptr(context); |
| 744 | |
| 745 | if (parent->limit != NULL) { |
| 746 | limit = parent->limit; |
| 747 | } |
| 748 | |
| 749 | tc = tc_alloc_pool(parent, TC_HDR_SIZE+size, prefix_len); |
| 750 | } |
| 751 | |
| 752 | if (tc == NULL) { |
| 753 | char *ptr; |
| 754 | |
| 755 | /* |
| 756 | * Only do the memlimit check/update on actual allocation. |
| 757 | */ |
| 758 | if (!talloc_memlimit_check(limit, total_len)) { |
| 759 | errno = ENOMEM; |
| 760 | return NULL; |
| 761 | } |
| 762 | |
| 763 | ptr = malloc(total_len); |
| 764 | if (unlikely(ptr == NULL)) { |
| 765 | return NULL; |
| 766 | } |
| 767 | tc = (struct talloc_chunk *)(ptr + prefix_len); |
| 768 | tc->flags = talloc_magic; |
| 769 | tc->pool = NULL; |
| 770 | |
| 771 | talloc_memlimit_grow(limit, total_len); |
| 772 | } |
| 773 | |
| 774 | tc->limit = limit; |
| 775 | tc->size = size; |
| 776 | tc->destructor = NULL; |
| 777 | tc->child = NULL; |
| 778 | tc->name = NULL; |
| 779 | tc->refs = NULL; |
| 780 | |
| 781 | if (likely(context != NULL)) { |
| 782 | if (parent->child) { |
| 783 | parent->child->parent = NULL; |
| 784 | tc->next = parent->child; |
| 785 | tc->next->prev = tc; |
| 786 | } else { |
| 787 | tc->next = NULL; |
| 788 | } |
| 789 | tc->parent = parent; |
| 790 | tc->prev = NULL; |
| 791 | parent->child = tc; |
| 792 | } else { |
| 793 | tc->next = tc->prev = tc->parent = NULL; |
| 794 | } |
| 795 | |
| 796 | *tc_ret = tc; |
| 797 | return TC_PTR_FROM_CHUNK(tc); |
| 798 | } |
| 799 | |
| 800 | static inline void *__talloc(const void *context, |
| 801 | size_t size, |
| 802 | struct talloc_chunk **tc) |
| 803 | { |
| 804 | return __talloc_with_prefix(context, size, 0, tc); |
| 805 | } |
| 806 | |
| 807 | /* |
| 808 | * Create a talloc pool |
| 809 | */ |
| 810 | |
| 811 | static inline void *_talloc_pool(const void *context, size_t size) |
| 812 | { |
| 813 | struct talloc_chunk *tc; |
| 814 | struct talloc_pool_hdr *pool_hdr; |
| 815 | void *result; |
| 816 | |
| 817 | result = __talloc_with_prefix(context, size, TP_HDR_SIZE, &tc); |
| 818 | |
| 819 | if (unlikely(result == NULL)) { |
| 820 | return NULL; |
| 821 | } |
| 822 | |
| 823 | pool_hdr = talloc_pool_from_chunk(tc); |
| 824 | |
| 825 | tc->flags |= TALLOC_FLAG_POOL; |
| 826 | tc->size = 0; |
| 827 | |
| 828 | pool_hdr->object_count = 1; |
| 829 | pool_hdr->end = result; |
| 830 | pool_hdr->poolsize = size; |
| 831 | |
| 832 | tc_invalidate_pool(pool_hdr); |
| 833 | |
| 834 | return result; |
| 835 | } |
| 836 | |
| 837 | _PUBLIC_ void *talloc_pool(const void *context, size_t size) |
| 838 | { |
| 839 | return _talloc_pool(context, size); |
| 840 | } |
| 841 | |
| 842 | /* |
| 843 | * Create a talloc pool correctly sized for a basic size plus |
| 844 | * a number of subobjects whose total size is given. Essentially |
| 845 | * a custom allocator for talloc to reduce fragmentation. |
| 846 | */ |
| 847 | |
| 848 | _PUBLIC_ void *_talloc_pooled_object(const void *ctx, |
| 849 | size_t type_size, |
| 850 | const char *type_name, |
| 851 | unsigned num_subobjects, |
| 852 | size_t total_subobjects_size) |
| 853 | { |
| 854 | size_t poolsize, subobjects_slack, tmp; |
| 855 | struct talloc_chunk *tc; |
| 856 | struct talloc_pool_hdr *pool_hdr; |
| 857 | void *ret; |
| 858 | |
| 859 | poolsize = type_size + total_subobjects_size; |
| 860 | |
| 861 | if ((poolsize < type_size) || (poolsize < total_subobjects_size)) { |
| 862 | goto overflow; |
| 863 | } |
| 864 | |
| 865 | if (num_subobjects == UINT_MAX) { |
| 866 | goto overflow; |
| 867 | } |
| 868 | num_subobjects += 1; /* the object body itself */ |
| 869 | |
| 870 | /* |
| 871 | * Alignment can increase the pool size by at most 15 bytes per object |
| 872 | * plus alignment for the object itself |
| 873 | */ |
| 874 | subobjects_slack = (TC_HDR_SIZE + TP_HDR_SIZE + 15) * num_subobjects; |
| 875 | if (subobjects_slack < num_subobjects) { |
| 876 | goto overflow; |
| 877 | } |
| 878 | |
| 879 | tmp = poolsize + subobjects_slack; |
| 880 | if ((tmp < poolsize) || (tmp < subobjects_slack)) { |
| 881 | goto overflow; |
| 882 | } |
| 883 | poolsize = tmp; |
| 884 | |
| 885 | ret = _talloc_pool(ctx, poolsize); |
| 886 | if (ret == NULL) { |
| 887 | return NULL; |
| 888 | } |
| 889 | |
| 890 | tc = talloc_chunk_from_ptr(ret); |
| 891 | tc->size = type_size; |
| 892 | |
| 893 | pool_hdr = talloc_pool_from_chunk(tc); |
| 894 | |
| 895 | #if defined(DEVELOPER) && defined(VALGRIND_MAKE_MEM_UNDEFINED) |
| 896 | VALGRIND_MAKE_MEM_UNDEFINED(pool_hdr->end, type_size); |
| 897 | #endif |
| 898 | |
| 899 | pool_hdr->end = ((char *)pool_hdr->end + TC_ALIGN16(type_size)); |
| 900 | |
| 901 | _tc_set_name_const(tc, type_name); |
| 902 | return ret; |
| 903 | |
| 904 | overflow: |
| 905 | return NULL; |
| 906 | } |
| 907 | |
| 908 | /* |
| 909 | setup a destructor to be called on free of a pointer |
| 910 | the destructor should return 0 on success, or -1 on failure. |
| 911 | if the destructor fails then the free is failed, and the memory can |
| 912 | be continued to be used |
| 913 | */ |
| 914 | _PUBLIC_ void _talloc_set_destructor(const void *ptr, int (*destructor)(void *)) |
| 915 | { |
| 916 | struct talloc_chunk *tc = talloc_chunk_from_ptr(ptr); |
| 917 | tc->destructor = destructor; |
| 918 | } |
| 919 | |
| 920 | /* |
| 921 | increase the reference count on a piece of memory. |
| 922 | */ |
| 923 | _PUBLIC_ int talloc_increase_ref_count(const void *ptr) |
| 924 | { |
| 925 | if (unlikely(!talloc_reference(null_context, ptr))) { |
| 926 | return -1; |
| 927 | } |
| 928 | return 0; |
| 929 | } |
| 930 | |
| 931 | /* |
| 932 | helper for talloc_reference() |
| 933 | |
| 934 | this is referenced by a function pointer and should not be inline |
| 935 | */ |
| 936 | static int talloc_reference_destructor(struct talloc_reference_handle *handle) |
| 937 | { |
| 938 | struct talloc_chunk *ptr_tc = talloc_chunk_from_ptr(handle->ptr); |
| 939 | _TLIST_REMOVE(ptr_tc->refs, handle); |
| 940 | return 0; |
| 941 | } |
| 942 | |
| 943 | /* |
| 944 | more efficient way to add a name to a pointer - the name must point to a |
| 945 | true string constant |
| 946 | */ |
| 947 | static inline void _tc_set_name_const(struct talloc_chunk *tc, |
| 948 | const char *name) |
| 949 | { |
| 950 | tc->name = name; |
| 951 | } |
| 952 | |
| 953 | /* |
| 954 | internal talloc_named_const() |
| 955 | */ |
| 956 | static inline void *_talloc_named_const(const void *context, size_t size, const char *name) |
| 957 | { |
| 958 | void *ptr; |
| 959 | struct talloc_chunk *tc; |
| 960 | |
| 961 | ptr = __talloc(context, size, &tc); |
| 962 | if (unlikely(ptr == NULL)) { |
| 963 | return NULL; |
| 964 | } |
| 965 | |
| 966 | _tc_set_name_const(tc, name); |
| 967 | |
| 968 | return ptr; |
| 969 | } |
| 970 | |
| 971 | /* |
| 972 | make a secondary reference to a pointer, hanging off the given context. |
| 973 | the pointer remains valid until both the original caller and this given |
| 974 | context are freed. |
| 975 | |
| 976 | the major use for this is when two different structures need to reference the |
| 977 | same underlying data, and you want to be able to free the two instances separately, |
| 978 | and in either order |
| 979 | */ |
| 980 | _PUBLIC_ void *_talloc_reference_loc(const void *context, const void *ptr, const char *location) |
| 981 | { |
| 982 | struct talloc_chunk *tc; |
| 983 | struct talloc_reference_handle *handle; |
| 984 | if (unlikely(ptr == NULL)) return NULL; |
| 985 | |
| 986 | tc = talloc_chunk_from_ptr(ptr); |
| 987 | handle = (struct talloc_reference_handle *)_talloc_named_const(context, |
| 988 | sizeof(struct talloc_reference_handle), |
| 989 | TALLOC_MAGIC_REFERENCE); |
| 990 | if (unlikely(handle == NULL)) return NULL; |
| 991 | |
| 992 | /* note that we hang the destructor off the handle, not the |
| 993 | main context as that allows the caller to still setup their |
| 994 | own destructor on the context if they want to */ |
| 995 | talloc_set_destructor(handle, talloc_reference_destructor); |
| 996 | handle->ptr = discard_const_p(void, ptr); |
| 997 | handle->location = location; |
| 998 | _TLIST_ADD(tc->refs, handle); |
| 999 | return handle->ptr; |
| 1000 | } |
| 1001 | |
| 1002 | static void *_talloc_steal_internal(const void *new_ctx, const void *ptr); |
| 1003 | |
| 1004 | static inline void _tc_free_poolmem(struct talloc_chunk *tc, |
| 1005 | const char *location) |
| 1006 | { |
| 1007 | struct talloc_pool_hdr *pool; |
| 1008 | struct talloc_chunk *pool_tc; |
| 1009 | void *next_tc; |
| 1010 | |
| 1011 | pool = tc->pool; |
| 1012 | pool_tc = talloc_chunk_from_pool(pool); |
| 1013 | next_tc = tc_next_chunk(tc); |
| 1014 | |
| 1015 | _talloc_chunk_set_free(tc, location); |
| 1016 | |
| 1017 | TC_INVALIDATE_FULL_CHUNK(tc); |
| 1018 | |
| 1019 | if (unlikely(pool->object_count == 0)) { |
| 1020 | talloc_abort("Pool object count zero!"); |
| 1021 | return; |
| 1022 | } |
| 1023 | |
| 1024 | pool->object_count--; |
| 1025 | |
| 1026 | if (unlikely(pool->object_count == 1 |
| 1027 | && !(pool_tc->flags & TALLOC_FLAG_FREE))) { |
| 1028 | /* |
| 1029 | * if there is just one object left in the pool |
| 1030 | * and pool->flags does not have TALLOC_FLAG_FREE, |
| 1031 | * it means this is the pool itself and |
| 1032 | * the rest is available for new objects |
| 1033 | * again. |
| 1034 | */ |
| 1035 | pool->end = tc_pool_first_chunk(pool); |
| 1036 | tc_invalidate_pool(pool); |
| 1037 | return; |
| 1038 | } |
| 1039 | |
| 1040 | if (unlikely(pool->object_count == 0)) { |
| 1041 | /* |
| 1042 | * we mark the freed memory with where we called the free |
| 1043 | * from. This means on a double free error we can report where |
| 1044 | * the first free came from |
| 1045 | */ |
| 1046 | pool_tc->name = location; |
| 1047 | |
| 1048 | if (pool_tc->flags & TALLOC_FLAG_POOLMEM) { |
| 1049 | _tc_free_poolmem(pool_tc, location); |
| 1050 | } else { |
| 1051 | /* |
| 1052 | * The tc_memlimit_update_on_free() |
| 1053 | * call takes into account the |
| 1054 | * prefix TP_HDR_SIZE allocated before |
| 1055 | * the pool talloc_chunk. |
| 1056 | */ |
| 1057 | tc_memlimit_update_on_free(pool_tc); |
| 1058 | TC_INVALIDATE_FULL_CHUNK(pool_tc); |
| 1059 | free(pool); |
| 1060 | } |
| 1061 | return; |
| 1062 | } |
| 1063 | |
| 1064 | if (pool->end == next_tc) { |
| 1065 | /* |
| 1066 | * if pool->pool still points to end of |
| 1067 | * 'tc' (which is stored in the 'next_tc' variable), |
| 1068 | * we can reclaim the memory of 'tc'. |
| 1069 | */ |
| 1070 | pool->end = tc; |
| 1071 | return; |
| 1072 | } |
| 1073 | |
| 1074 | /* |
| 1075 | * Do nothing. The memory is just "wasted", waiting for the pool |
| 1076 | * itself to be freed. |
| 1077 | */ |
| 1078 | } |
| 1079 | |
| 1080 | static inline void _tc_free_children_internal(struct talloc_chunk *tc, |
| 1081 | void *ptr, |
| 1082 | const char *location); |
| 1083 | |
| 1084 | static inline int _talloc_free_internal(void *ptr, const char *location); |
| 1085 | |
| 1086 | /* |
| 1087 | internal free call that takes a struct talloc_chunk *. |
| 1088 | */ |
| 1089 | static inline int _tc_free_internal(struct talloc_chunk *tc, |
| 1090 | const char *location) |
| 1091 | { |
| 1092 | void *ptr_to_free; |
| 1093 | void *ptr = TC_PTR_FROM_CHUNK(tc); |
| 1094 | |
| 1095 | if (unlikely(tc->refs)) { |
| 1096 | int is_child; |
| 1097 | /* check if this is a reference from a child or |
| 1098 | * grandchild back to it's parent or grandparent |
| 1099 | * |
| 1100 | * in that case we need to remove the reference and |
| 1101 | * call another instance of talloc_free() on the current |
| 1102 | * pointer. |
| 1103 | */ |
| 1104 | is_child = talloc_is_parent(tc->refs, ptr); |
| 1105 | _talloc_free_internal(tc->refs, location); |
| 1106 | if (is_child) { |
| 1107 | return _talloc_free_internal(ptr, location); |
| 1108 | } |
| 1109 | return -1; |
| 1110 | } |
| 1111 | |
| 1112 | if (unlikely(tc->flags & TALLOC_FLAG_LOOP)) { |
| 1113 | /* we have a free loop - stop looping */ |
| 1114 | return 0; |
| 1115 | } |
| 1116 | |
| 1117 | if (unlikely(tc->destructor)) { |
| 1118 | talloc_destructor_t d = tc->destructor; |
| 1119 | |
| 1120 | /* |
| 1121 | * Protect the destructor against some overwrite |
| 1122 | * attacks, by explicitly checking it has the right |
| 1123 | * magic here. |
| 1124 | */ |
| 1125 | if (talloc_chunk_from_ptr(ptr) != tc) { |
| 1126 | /* |
| 1127 | * This can't actually happen, the |
| 1128 | * call itself will panic. |
| 1129 | */ |
| 1130 | TALLOC_ABORT("talloc_chunk_from_ptr failed!"); |
| 1131 | } |
| 1132 | |
| 1133 | if (d == (talloc_destructor_t)-1) { |
| 1134 | return -1; |
| 1135 | } |
| 1136 | tc->destructor = (talloc_destructor_t)-1; |
| 1137 | if (d(ptr) == -1) { |
| 1138 | /* |
| 1139 | * Only replace the destructor pointer if |
| 1140 | * calling the destructor didn't modify it. |
| 1141 | */ |
| 1142 | if (tc->destructor == (talloc_destructor_t)-1) { |
| 1143 | tc->destructor = d; |
| 1144 | } |
| 1145 | return -1; |
| 1146 | } |
| 1147 | tc->destructor = NULL; |
| 1148 | } |
| 1149 | |
| 1150 | if (tc->parent) { |
| 1151 | _TLIST_REMOVE(tc->parent->child, tc); |
| 1152 | if (tc->parent->child) { |
| 1153 | tc->parent->child->parent = tc->parent; |
| 1154 | } |
| 1155 | } else { |
| 1156 | if (tc->prev) tc->prev->next = tc->next; |
| 1157 | if (tc->next) tc->next->prev = tc->prev; |
| 1158 | tc->prev = tc->next = NULL; |
| 1159 | } |
| 1160 | |
| 1161 | tc->flags |= TALLOC_FLAG_LOOP; |
| 1162 | |
| 1163 | _tc_free_children_internal(tc, ptr, location); |
| 1164 | |
| 1165 | _talloc_chunk_set_free(tc, location); |
| 1166 | |
| 1167 | if (tc->flags & TALLOC_FLAG_POOL) { |
| 1168 | struct talloc_pool_hdr *pool; |
| 1169 | |
| 1170 | pool = talloc_pool_from_chunk(tc); |
| 1171 | |
| 1172 | if (unlikely(pool->object_count == 0)) { |
| 1173 | talloc_abort("Pool object count zero!"); |
| 1174 | return 0; |
| 1175 | } |
| 1176 | |
| 1177 | pool->object_count--; |
| 1178 | |
| 1179 | if (likely(pool->object_count != 0)) { |
| 1180 | return 0; |
| 1181 | } |
| 1182 | |
| 1183 | /* |
| 1184 | * With object_count==0, a pool becomes a normal piece of |
| 1185 | * memory to free. If it's allocated inside a pool, it needs |
| 1186 | * to be freed as poolmem, else it needs to be just freed. |
| 1187 | */ |
| 1188 | ptr_to_free = pool; |
| 1189 | } else { |
| 1190 | ptr_to_free = tc; |
| 1191 | } |
| 1192 | |
| 1193 | if (tc->flags & TALLOC_FLAG_POOLMEM) { |
| 1194 | _tc_free_poolmem(tc, location); |
| 1195 | return 0; |
| 1196 | } |
| 1197 | |
| 1198 | tc_memlimit_update_on_free(tc); |
| 1199 | |
| 1200 | TC_INVALIDATE_FULL_CHUNK(tc); |
| 1201 | free(ptr_to_free); |
| 1202 | return 0; |
| 1203 | } |
| 1204 | |
| 1205 | /* |
| 1206 | internal talloc_free call |
| 1207 | */ |
| 1208 | static inline int _talloc_free_internal(void *ptr, const char *location) |
| 1209 | { |
| 1210 | struct talloc_chunk *tc; |
| 1211 | |
| 1212 | if (unlikely(ptr == NULL)) { |
| 1213 | return -1; |
| 1214 | } |
| 1215 | |
| 1216 | /* possibly initialised the talloc fill value */ |
| 1217 | if (unlikely(!talloc_fill.initialised)) { |
| 1218 | const char *fill = getenv(TALLOC_FILL_ENV); |
| 1219 | if (fill != NULL) { |
| 1220 | talloc_fill.enabled = true; |
| 1221 | talloc_fill.fill_value = strtoul(fill, NULL, 0); |
| 1222 | } |
| 1223 | talloc_fill.initialised = true; |
| 1224 | } |
| 1225 | |
| 1226 | tc = talloc_chunk_from_ptr(ptr); |
| 1227 | return _tc_free_internal(tc, location); |
| 1228 | } |
| 1229 | |
| 1230 | static inline size_t _talloc_total_limit_size(const void *ptr, |
| 1231 | struct talloc_memlimit *old_limit, |
| 1232 | struct talloc_memlimit *new_limit); |
| 1233 | |
| 1234 | /* |
| 1235 | move a lump of memory from one talloc context to another return the |
| 1236 | ptr on success, or NULL if it could not be transferred. |
| 1237 | passing NULL as ptr will always return NULL with no side effects. |
| 1238 | */ |
| 1239 | static void *_talloc_steal_internal(const void *new_ctx, const void *ptr) |
| 1240 | { |
| 1241 | struct talloc_chunk *tc, *new_tc; |
| 1242 | size_t ctx_size = 0; |
| 1243 | |
| 1244 | if (unlikely(!ptr)) { |
| 1245 | return NULL; |
| 1246 | } |
| 1247 | |
| 1248 | if (unlikely(new_ctx == NULL)) { |
| 1249 | new_ctx = null_context; |
| 1250 | } |
| 1251 | |
| 1252 | tc = talloc_chunk_from_ptr(ptr); |
| 1253 | |
| 1254 | if (tc->limit != NULL) { |
| 1255 | |
| 1256 | ctx_size = _talloc_total_limit_size(ptr, NULL, NULL); |
| 1257 | |
| 1258 | /* Decrement the memory limit from the source .. */ |
| 1259 | talloc_memlimit_shrink(tc->limit->upper, ctx_size); |
| 1260 | |
| 1261 | if (tc->limit->parent == tc) { |
| 1262 | tc->limit->upper = NULL; |
| 1263 | } else { |
| 1264 | tc->limit = NULL; |
| 1265 | } |
| 1266 | } |
| 1267 | |
| 1268 | if (unlikely(new_ctx == NULL)) { |
| 1269 | if (tc->parent) { |
| 1270 | _TLIST_REMOVE(tc->parent->child, tc); |
| 1271 | if (tc->parent->child) { |
| 1272 | tc->parent->child->parent = tc->parent; |
| 1273 | } |
| 1274 | } else { |
| 1275 | if (tc->prev) tc->prev->next = tc->next; |
| 1276 | if (tc->next) tc->next->prev = tc->prev; |
| 1277 | } |
| 1278 | |
| 1279 | tc->parent = tc->next = tc->prev = NULL; |
| 1280 | return discard_const_p(void, ptr); |
| 1281 | } |
| 1282 | |
| 1283 | new_tc = talloc_chunk_from_ptr(new_ctx); |
| 1284 | |
| 1285 | if (unlikely(tc == new_tc || tc->parent == new_tc)) { |
| 1286 | return discard_const_p(void, ptr); |
| 1287 | } |
| 1288 | |
| 1289 | if (tc->parent) { |
| 1290 | _TLIST_REMOVE(tc->parent->child, tc); |
| 1291 | if (tc->parent->child) { |
| 1292 | tc->parent->child->parent = tc->parent; |
| 1293 | } |
| 1294 | } else { |
| 1295 | if (tc->prev) tc->prev->next = tc->next; |
| 1296 | if (tc->next) tc->next->prev = tc->prev; |
| 1297 | tc->prev = tc->next = NULL; |
| 1298 | } |
| 1299 | |
| 1300 | tc->parent = new_tc; |
| 1301 | if (new_tc->child) new_tc->child->parent = NULL; |
| 1302 | _TLIST_ADD(new_tc->child, tc); |
| 1303 | |
| 1304 | if (tc->limit || new_tc->limit) { |
| 1305 | ctx_size = _talloc_total_limit_size(ptr, tc->limit, |
| 1306 | new_tc->limit); |
| 1307 | /* .. and increment it in the destination. */ |
| 1308 | if (new_tc->limit) { |
| 1309 | talloc_memlimit_grow(new_tc->limit, ctx_size); |
| 1310 | } |
| 1311 | } |
| 1312 | |
| 1313 | return discard_const_p(void, ptr); |
| 1314 | } |
| 1315 | |
| 1316 | /* |
| 1317 | move a lump of memory from one talloc context to another return the |
| 1318 | ptr on success, or NULL if it could not be transferred. |
| 1319 | passing NULL as ptr will always return NULL with no side effects. |
| 1320 | */ |
| 1321 | _PUBLIC_ void *_talloc_steal_loc(const void *new_ctx, const void *ptr, const char *location) |
| 1322 | { |
| 1323 | struct talloc_chunk *tc; |
| 1324 | |
| 1325 | if (unlikely(ptr == NULL)) { |
| 1326 | return NULL; |
| 1327 | } |
| 1328 | |
| 1329 | tc = talloc_chunk_from_ptr(ptr); |
| 1330 | |
| 1331 | if (unlikely(tc->refs != NULL) && talloc_parent(ptr) != new_ctx) { |
| 1332 | struct talloc_reference_handle *h; |
| 1333 | |
Harald Welte | 189f43d | 2019-04-17 21:19:04 +0200 | [diff] [blame] | 1334 | talloc_log("WARNING: talloc_steal with references at %s\r\n", |
Harald Welte | 5df0be6 | 2019-04-17 20:54:29 +0200 | [diff] [blame] | 1335 | location); |
| 1336 | |
| 1337 | for (h=tc->refs; h; h=h->next) { |
Harald Welte | 189f43d | 2019-04-17 21:19:04 +0200 | [diff] [blame] | 1338 | talloc_log("\treference at %s\r\n", |
Harald Welte | 5df0be6 | 2019-04-17 20:54:29 +0200 | [diff] [blame] | 1339 | h->location); |
| 1340 | } |
| 1341 | } |
| 1342 | |
| 1343 | #if 0 |
| 1344 | /* this test is probably too expensive to have on in the |
| 1345 | normal build, but it useful for debugging */ |
| 1346 | if (talloc_is_parent(new_ctx, ptr)) { |
Harald Welte | 189f43d | 2019-04-17 21:19:04 +0200 | [diff] [blame] | 1347 | talloc_log("WARNING: stealing into talloc child at %s\r\n", location); |
Harald Welte | 5df0be6 | 2019-04-17 20:54:29 +0200 | [diff] [blame] | 1348 | } |
| 1349 | #endif |
| 1350 | |
| 1351 | return _talloc_steal_internal(new_ctx, ptr); |
| 1352 | } |
| 1353 | |
| 1354 | /* |
| 1355 | this is like a talloc_steal(), but you must supply the old |
| 1356 | parent. This resolves the ambiguity in a talloc_steal() which is |
| 1357 | called on a context that has more than one parent (via references) |
| 1358 | |
| 1359 | The old parent can be either a reference or a parent |
| 1360 | */ |
| 1361 | _PUBLIC_ void *talloc_reparent(const void *old_parent, const void *new_parent, const void *ptr) |
| 1362 | { |
| 1363 | struct talloc_chunk *tc; |
| 1364 | struct talloc_reference_handle *h; |
| 1365 | |
| 1366 | if (unlikely(ptr == NULL)) { |
| 1367 | return NULL; |
| 1368 | } |
| 1369 | |
| 1370 | if (old_parent == talloc_parent(ptr)) { |
| 1371 | return _talloc_steal_internal(new_parent, ptr); |
| 1372 | } |
| 1373 | |
| 1374 | tc = talloc_chunk_from_ptr(ptr); |
| 1375 | for (h=tc->refs;h;h=h->next) { |
| 1376 | if (talloc_parent(h) == old_parent) { |
| 1377 | if (_talloc_steal_internal(new_parent, h) != h) { |
| 1378 | return NULL; |
| 1379 | } |
| 1380 | return discard_const_p(void, ptr); |
| 1381 | } |
| 1382 | } |
| 1383 | |
| 1384 | /* it wasn't a parent */ |
| 1385 | return NULL; |
| 1386 | } |
| 1387 | |
| 1388 | /* |
| 1389 | remove a secondary reference to a pointer. This undo's what |
| 1390 | talloc_reference() has done. The context and pointer arguments |
| 1391 | must match those given to a talloc_reference() |
| 1392 | */ |
| 1393 | static inline int talloc_unreference(const void *context, const void *ptr) |
| 1394 | { |
| 1395 | struct talloc_chunk *tc = talloc_chunk_from_ptr(ptr); |
| 1396 | struct talloc_reference_handle *h; |
| 1397 | |
| 1398 | if (unlikely(context == NULL)) { |
| 1399 | context = null_context; |
| 1400 | } |
| 1401 | |
| 1402 | for (h=tc->refs;h;h=h->next) { |
| 1403 | struct talloc_chunk *p = talloc_parent_chunk(h); |
| 1404 | if (p == NULL) { |
| 1405 | if (context == NULL) break; |
| 1406 | } else if (TC_PTR_FROM_CHUNK(p) == context) { |
| 1407 | break; |
| 1408 | } |
| 1409 | } |
| 1410 | if (h == NULL) { |
| 1411 | return -1; |
| 1412 | } |
| 1413 | |
| 1414 | return _talloc_free_internal(h, __location__); |
| 1415 | } |
| 1416 | |
| 1417 | /* |
| 1418 | remove a specific parent context from a pointer. This is a more |
| 1419 | controlled variant of talloc_free() |
| 1420 | */ |
| 1421 | _PUBLIC_ int talloc_unlink(const void *context, void *ptr) |
| 1422 | { |
| 1423 | struct talloc_chunk *tc_p, *new_p, *tc_c; |
| 1424 | void *new_parent; |
| 1425 | |
| 1426 | if (ptr == NULL) { |
| 1427 | return -1; |
| 1428 | } |
| 1429 | |
| 1430 | if (context == NULL) { |
| 1431 | context = null_context; |
| 1432 | } |
| 1433 | |
| 1434 | if (talloc_unreference(context, ptr) == 0) { |
| 1435 | return 0; |
| 1436 | } |
| 1437 | |
| 1438 | if (context != NULL) { |
| 1439 | tc_c = talloc_chunk_from_ptr(context); |
| 1440 | } else { |
| 1441 | tc_c = NULL; |
| 1442 | } |
| 1443 | if (tc_c != talloc_parent_chunk(ptr)) { |
| 1444 | return -1; |
| 1445 | } |
| 1446 | |
| 1447 | tc_p = talloc_chunk_from_ptr(ptr); |
| 1448 | |
| 1449 | if (tc_p->refs == NULL) { |
| 1450 | return _talloc_free_internal(ptr, __location__); |
| 1451 | } |
| 1452 | |
| 1453 | new_p = talloc_parent_chunk(tc_p->refs); |
| 1454 | if (new_p) { |
| 1455 | new_parent = TC_PTR_FROM_CHUNK(new_p); |
| 1456 | } else { |
| 1457 | new_parent = NULL; |
| 1458 | } |
| 1459 | |
| 1460 | if (talloc_unreference(new_parent, ptr) != 0) { |
| 1461 | return -1; |
| 1462 | } |
| 1463 | |
| 1464 | _talloc_steal_internal(new_parent, ptr); |
| 1465 | |
| 1466 | return 0; |
| 1467 | } |
| 1468 | |
| 1469 | /* |
| 1470 | add a name to an existing pointer - va_list version |
| 1471 | */ |
| 1472 | static inline const char *tc_set_name_v(struct talloc_chunk *tc, |
| 1473 | const char *fmt, |
| 1474 | va_list ap) PRINTF_ATTRIBUTE(2,0); |
| 1475 | |
| 1476 | static inline const char *tc_set_name_v(struct talloc_chunk *tc, |
| 1477 | const char *fmt, |
| 1478 | va_list ap) |
| 1479 | { |
| 1480 | struct talloc_chunk *name_tc = _vasprintf_tc(TC_PTR_FROM_CHUNK(tc), |
| 1481 | fmt, |
| 1482 | ap); |
| 1483 | if (likely(name_tc)) { |
| 1484 | tc->name = TC_PTR_FROM_CHUNK(name_tc); |
| 1485 | _tc_set_name_const(name_tc, ".name"); |
| 1486 | } else { |
| 1487 | tc->name = NULL; |
| 1488 | } |
| 1489 | return tc->name; |
| 1490 | } |
| 1491 | |
| 1492 | /* |
| 1493 | add a name to an existing pointer |
| 1494 | */ |
| 1495 | _PUBLIC_ const char *talloc_set_name(const void *ptr, const char *fmt, ...) |
| 1496 | { |
| 1497 | struct talloc_chunk *tc = talloc_chunk_from_ptr(ptr); |
| 1498 | const char *name; |
| 1499 | va_list ap; |
| 1500 | va_start(ap, fmt); |
| 1501 | name = tc_set_name_v(tc, fmt, ap); |
| 1502 | va_end(ap); |
| 1503 | return name; |
| 1504 | } |
| 1505 | |
| 1506 | |
| 1507 | /* |
| 1508 | create a named talloc pointer. Any talloc pointer can be named, and |
| 1509 | talloc_named() operates just like talloc() except that it allows you |
| 1510 | to name the pointer. |
| 1511 | */ |
| 1512 | _PUBLIC_ void *talloc_named(const void *context, size_t size, const char *fmt, ...) |
| 1513 | { |
| 1514 | va_list ap; |
| 1515 | void *ptr; |
| 1516 | const char *name; |
| 1517 | struct talloc_chunk *tc; |
| 1518 | |
| 1519 | ptr = __talloc(context, size, &tc); |
| 1520 | if (unlikely(ptr == NULL)) return NULL; |
| 1521 | |
| 1522 | va_start(ap, fmt); |
| 1523 | name = tc_set_name_v(tc, fmt, ap); |
| 1524 | va_end(ap); |
| 1525 | |
| 1526 | if (unlikely(name == NULL)) { |
| 1527 | _talloc_free_internal(ptr, __location__); |
| 1528 | return NULL; |
| 1529 | } |
| 1530 | |
| 1531 | return ptr; |
| 1532 | } |
| 1533 | |
| 1534 | /* |
| 1535 | return the name of a talloc ptr, or "UNNAMED" |
| 1536 | */ |
| 1537 | static inline const char *__talloc_get_name(const void *ptr) |
| 1538 | { |
| 1539 | struct talloc_chunk *tc = talloc_chunk_from_ptr(ptr); |
| 1540 | if (unlikely(tc->name == TALLOC_MAGIC_REFERENCE)) { |
| 1541 | return ".reference"; |
| 1542 | } |
| 1543 | if (likely(tc->name)) { |
| 1544 | return tc->name; |
| 1545 | } |
| 1546 | return "UNNAMED"; |
| 1547 | } |
| 1548 | |
| 1549 | _PUBLIC_ const char *talloc_get_name(const void *ptr) |
| 1550 | { |
| 1551 | return __talloc_get_name(ptr); |
| 1552 | } |
| 1553 | |
| 1554 | /* |
| 1555 | check if a pointer has the given name. If it does, return the pointer, |
| 1556 | otherwise return NULL |
| 1557 | */ |
| 1558 | _PUBLIC_ void *talloc_check_name(const void *ptr, const char *name) |
| 1559 | { |
| 1560 | const char *pname; |
| 1561 | if (unlikely(ptr == NULL)) return NULL; |
| 1562 | pname = __talloc_get_name(ptr); |
| 1563 | if (likely(pname == name || strcmp(pname, name) == 0)) { |
| 1564 | return discard_const_p(void, ptr); |
| 1565 | } |
| 1566 | return NULL; |
| 1567 | } |
| 1568 | |
| 1569 | static void talloc_abort_type_mismatch(const char *location, |
| 1570 | const char *name, |
| 1571 | const char *expected) |
| 1572 | { |
| 1573 | const char *reason; |
| 1574 | |
| 1575 | reason = talloc_asprintf(NULL, |
| 1576 | "%s: Type mismatch: name[%s] expected[%s]", |
| 1577 | location, |
| 1578 | name?name:"NULL", |
| 1579 | expected); |
| 1580 | if (!reason) { |
| 1581 | reason = "Type mismatch"; |
| 1582 | } |
| 1583 | |
| 1584 | talloc_abort(reason); |
| 1585 | } |
| 1586 | |
| 1587 | _PUBLIC_ void *_talloc_get_type_abort(const void *ptr, const char *name, const char *location) |
| 1588 | { |
| 1589 | const char *pname; |
| 1590 | |
| 1591 | if (unlikely(ptr == NULL)) { |
| 1592 | talloc_abort_type_mismatch(location, NULL, name); |
| 1593 | return NULL; |
| 1594 | } |
| 1595 | |
| 1596 | pname = __talloc_get_name(ptr); |
| 1597 | if (likely(pname == name || strcmp(pname, name) == 0)) { |
| 1598 | return discard_const_p(void, ptr); |
| 1599 | } |
| 1600 | |
| 1601 | talloc_abort_type_mismatch(location, pname, name); |
| 1602 | return NULL; |
| 1603 | } |
| 1604 | |
| 1605 | /* |
| 1606 | this is for compatibility with older versions of talloc |
| 1607 | */ |
| 1608 | _PUBLIC_ void *talloc_init(const char *fmt, ...) |
| 1609 | { |
| 1610 | va_list ap; |
| 1611 | void *ptr; |
| 1612 | const char *name; |
| 1613 | struct talloc_chunk *tc; |
| 1614 | |
| 1615 | ptr = __talloc(NULL, 0, &tc); |
| 1616 | if (unlikely(ptr == NULL)) return NULL; |
| 1617 | |
| 1618 | va_start(ap, fmt); |
| 1619 | name = tc_set_name_v(tc, fmt, ap); |
| 1620 | va_end(ap); |
| 1621 | |
| 1622 | if (unlikely(name == NULL)) { |
| 1623 | _talloc_free_internal(ptr, __location__); |
| 1624 | return NULL; |
| 1625 | } |
| 1626 | |
| 1627 | return ptr; |
| 1628 | } |
| 1629 | |
| 1630 | static inline void _tc_free_children_internal(struct talloc_chunk *tc, |
| 1631 | void *ptr, |
| 1632 | const char *location) |
| 1633 | { |
| 1634 | while (tc->child) { |
| 1635 | /* we need to work out who will own an abandoned child |
| 1636 | if it cannot be freed. In priority order, the first |
| 1637 | choice is owner of any remaining reference to this |
| 1638 | pointer, the second choice is our parent, and the |
| 1639 | final choice is the null context. */ |
| 1640 | void *child = TC_PTR_FROM_CHUNK(tc->child); |
| 1641 | const void *new_parent = null_context; |
| 1642 | if (unlikely(tc->child->refs)) { |
| 1643 | struct talloc_chunk *p = talloc_parent_chunk(tc->child->refs); |
| 1644 | if (p) new_parent = TC_PTR_FROM_CHUNK(p); |
| 1645 | } |
| 1646 | if (unlikely(_tc_free_internal(tc->child, location) == -1)) { |
| 1647 | if (talloc_parent_chunk(child) != tc) { |
| 1648 | /* |
| 1649 | * Destructor already reparented this child. |
| 1650 | * No further reparenting needed. |
| 1651 | */ |
| 1652 | continue; |
| 1653 | } |
| 1654 | if (new_parent == null_context) { |
| 1655 | struct talloc_chunk *p = talloc_parent_chunk(ptr); |
| 1656 | if (p) new_parent = TC_PTR_FROM_CHUNK(p); |
| 1657 | } |
| 1658 | _talloc_steal_internal(new_parent, child); |
| 1659 | } |
| 1660 | } |
| 1661 | } |
| 1662 | |
| 1663 | /* |
| 1664 | this is a replacement for the Samba3 talloc_destroy_pool functionality. It |
| 1665 | should probably not be used in new code. It's in here to keep the talloc |
| 1666 | code consistent across Samba 3 and 4. |
| 1667 | */ |
| 1668 | _PUBLIC_ void talloc_free_children(void *ptr) |
| 1669 | { |
| 1670 | struct talloc_chunk *tc_name = NULL; |
| 1671 | struct talloc_chunk *tc; |
| 1672 | |
| 1673 | if (unlikely(ptr == NULL)) { |
| 1674 | return; |
| 1675 | } |
| 1676 | |
| 1677 | tc = talloc_chunk_from_ptr(ptr); |
| 1678 | |
| 1679 | /* we do not want to free the context name if it is a child .. */ |
| 1680 | if (likely(tc->child)) { |
| 1681 | for (tc_name = tc->child; tc_name; tc_name = tc_name->next) { |
| 1682 | if (tc->name == TC_PTR_FROM_CHUNK(tc_name)) break; |
| 1683 | } |
| 1684 | if (tc_name) { |
| 1685 | _TLIST_REMOVE(tc->child, tc_name); |
| 1686 | if (tc->child) { |
| 1687 | tc->child->parent = tc; |
| 1688 | } |
| 1689 | } |
| 1690 | } |
| 1691 | |
| 1692 | _tc_free_children_internal(tc, ptr, __location__); |
| 1693 | |
| 1694 | /* .. so we put it back after all other children have been freed */ |
| 1695 | if (tc_name) { |
| 1696 | if (tc->child) { |
| 1697 | tc->child->parent = NULL; |
| 1698 | } |
| 1699 | tc_name->parent = tc; |
| 1700 | _TLIST_ADD(tc->child, tc_name); |
| 1701 | } |
| 1702 | } |
| 1703 | |
| 1704 | /* |
| 1705 | Allocate a bit of memory as a child of an existing pointer |
| 1706 | */ |
| 1707 | _PUBLIC_ void *_talloc(const void *context, size_t size) |
| 1708 | { |
| 1709 | struct talloc_chunk *tc; |
| 1710 | return __talloc(context, size, &tc); |
| 1711 | } |
| 1712 | |
| 1713 | /* |
| 1714 | externally callable talloc_set_name_const() |
| 1715 | */ |
| 1716 | _PUBLIC_ void talloc_set_name_const(const void *ptr, const char *name) |
| 1717 | { |
| 1718 | _tc_set_name_const(talloc_chunk_from_ptr(ptr), name); |
| 1719 | } |
| 1720 | |
| 1721 | /* |
| 1722 | create a named talloc pointer. Any talloc pointer can be named, and |
| 1723 | talloc_named() operates just like talloc() except that it allows you |
| 1724 | to name the pointer. |
| 1725 | */ |
| 1726 | _PUBLIC_ void *talloc_named_const(const void *context, size_t size, const char *name) |
| 1727 | { |
| 1728 | return _talloc_named_const(context, size, name); |
| 1729 | } |
| 1730 | |
| 1731 | /* |
| 1732 | free a talloc pointer. This also frees all child pointers of this |
| 1733 | pointer recursively |
| 1734 | |
| 1735 | return 0 if the memory is actually freed, otherwise -1. The memory |
| 1736 | will not be freed if the ref_count is > 1 or the destructor (if |
| 1737 | any) returns non-zero |
| 1738 | */ |
| 1739 | _PUBLIC_ int _talloc_free(void *ptr, const char *location) |
| 1740 | { |
| 1741 | struct talloc_chunk *tc; |
| 1742 | |
| 1743 | if (unlikely(ptr == NULL)) { |
| 1744 | return -1; |
| 1745 | } |
| 1746 | |
| 1747 | tc = talloc_chunk_from_ptr(ptr); |
| 1748 | |
| 1749 | if (unlikely(tc->refs != NULL)) { |
| 1750 | struct talloc_reference_handle *h; |
| 1751 | |
| 1752 | if (talloc_parent(ptr) == null_context && tc->refs->next == NULL) { |
| 1753 | /* in this case we do know which parent should |
| 1754 | get this pointer, as there is really only |
| 1755 | one parent */ |
| 1756 | return talloc_unlink(null_context, ptr); |
| 1757 | } |
| 1758 | |
Harald Welte | 189f43d | 2019-04-17 21:19:04 +0200 | [diff] [blame] | 1759 | talloc_log("ERROR: talloc_free with references at %s\r\n", |
Harald Welte | 5df0be6 | 2019-04-17 20:54:29 +0200 | [diff] [blame] | 1760 | location); |
| 1761 | |
| 1762 | for (h=tc->refs; h; h=h->next) { |
Harald Welte | 189f43d | 2019-04-17 21:19:04 +0200 | [diff] [blame] | 1763 | talloc_log("\treference at %s\r\n", |
Harald Welte | 5df0be6 | 2019-04-17 20:54:29 +0200 | [diff] [blame] | 1764 | h->location); |
| 1765 | } |
| 1766 | return -1; |
| 1767 | } |
| 1768 | |
| 1769 | return _talloc_free_internal(ptr, location); |
| 1770 | } |
| 1771 | |
| 1772 | |
| 1773 | |
| 1774 | /* |
| 1775 | A talloc version of realloc. The context argument is only used if |
| 1776 | ptr is NULL |
| 1777 | */ |
| 1778 | _PUBLIC_ void *_talloc_realloc(const void *context, void *ptr, size_t size, const char *name) |
| 1779 | { |
| 1780 | struct talloc_chunk *tc; |
| 1781 | void *new_ptr; |
| 1782 | bool malloced = false; |
| 1783 | struct talloc_pool_hdr *pool_hdr = NULL; |
| 1784 | size_t old_size = 0; |
| 1785 | size_t new_size = 0; |
| 1786 | |
| 1787 | /* size zero is equivalent to free() */ |
| 1788 | if (unlikely(size == 0)) { |
| 1789 | talloc_unlink(context, ptr); |
| 1790 | return NULL; |
| 1791 | } |
| 1792 | |
| 1793 | if (unlikely(size >= MAX_TALLOC_SIZE)) { |
| 1794 | return NULL; |
| 1795 | } |
| 1796 | |
| 1797 | /* realloc(NULL) is equivalent to malloc() */ |
| 1798 | if (ptr == NULL) { |
| 1799 | return _talloc_named_const(context, size, name); |
| 1800 | } |
| 1801 | |
| 1802 | tc = talloc_chunk_from_ptr(ptr); |
| 1803 | |
| 1804 | /* don't allow realloc on referenced pointers */ |
| 1805 | if (unlikely(tc->refs)) { |
| 1806 | return NULL; |
| 1807 | } |
| 1808 | |
| 1809 | /* don't let anybody try to realloc a talloc_pool */ |
| 1810 | if (unlikely(tc->flags & TALLOC_FLAG_POOL)) { |
| 1811 | return NULL; |
| 1812 | } |
| 1813 | |
| 1814 | if (tc->limit && (size > tc->size)) { |
| 1815 | if (!talloc_memlimit_check(tc->limit, (size - tc->size))) { |
| 1816 | errno = ENOMEM; |
| 1817 | return NULL; |
| 1818 | } |
| 1819 | } |
| 1820 | |
| 1821 | /* handle realloc inside a talloc_pool */ |
| 1822 | if (unlikely(tc->flags & TALLOC_FLAG_POOLMEM)) { |
| 1823 | pool_hdr = tc->pool; |
| 1824 | } |
| 1825 | |
| 1826 | #if (ALWAYS_REALLOC == 0) |
| 1827 | /* don't shrink if we have less than 1k to gain */ |
| 1828 | if (size < tc->size && tc->limit == NULL) { |
| 1829 | if (pool_hdr) { |
| 1830 | void *next_tc = tc_next_chunk(tc); |
| 1831 | TC_INVALIDATE_SHRINK_CHUNK(tc, size); |
| 1832 | tc->size = size; |
| 1833 | if (next_tc == pool_hdr->end) { |
| 1834 | /* note: tc->size has changed, so this works */ |
| 1835 | pool_hdr->end = tc_next_chunk(tc); |
| 1836 | } |
| 1837 | return ptr; |
| 1838 | } else if ((tc->size - size) < 1024) { |
| 1839 | /* |
| 1840 | * if we call TC_INVALIDATE_SHRINK_CHUNK() here |
| 1841 | * we would need to call TC_UNDEFINE_GROW_CHUNK() |
| 1842 | * after each realloc call, which slows down |
| 1843 | * testing a lot :-(. |
| 1844 | * |
| 1845 | * That is why we only mark memory as undefined here. |
| 1846 | */ |
| 1847 | TC_UNDEFINE_SHRINK_CHUNK(tc, size); |
| 1848 | |
| 1849 | /* do not shrink if we have less than 1k to gain */ |
| 1850 | tc->size = size; |
| 1851 | return ptr; |
| 1852 | } |
| 1853 | } else if (tc->size == size) { |
| 1854 | /* |
| 1855 | * do not change the pointer if it is exactly |
| 1856 | * the same size. |
| 1857 | */ |
| 1858 | return ptr; |
| 1859 | } |
| 1860 | #endif |
| 1861 | |
| 1862 | /* |
| 1863 | * by resetting magic we catch users of the old memory |
| 1864 | * |
| 1865 | * We mark this memory as free, and also over-stamp the talloc |
| 1866 | * magic with the old-style magic. |
| 1867 | * |
| 1868 | * Why? This tries to avoid a memory read use-after-free from |
| 1869 | * disclosing our talloc magic, which would then allow an |
| 1870 | * attacker to prepare a valid header and so run a destructor. |
| 1871 | * |
| 1872 | * What else? We have to re-stamp back a valid normal magic |
| 1873 | * on this memory once realloc() is done, as it will have done |
| 1874 | * a memcpy() into the new valid memory. We can't do this in |
| 1875 | * reverse as that would be a real use-after-free. |
| 1876 | */ |
| 1877 | _talloc_chunk_set_free(tc, NULL); |
| 1878 | |
| 1879 | #if ALWAYS_REALLOC |
| 1880 | if (pool_hdr) { |
| 1881 | new_ptr = tc_alloc_pool(tc, size + TC_HDR_SIZE, 0); |
| 1882 | pool_hdr->object_count--; |
| 1883 | |
| 1884 | if (new_ptr == NULL) { |
| 1885 | new_ptr = malloc(TC_HDR_SIZE+size); |
| 1886 | malloced = true; |
| 1887 | new_size = size; |
| 1888 | } |
| 1889 | |
| 1890 | if (new_ptr) { |
| 1891 | memcpy(new_ptr, tc, MIN(tc->size,size) + TC_HDR_SIZE); |
| 1892 | TC_INVALIDATE_FULL_CHUNK(tc); |
| 1893 | } |
| 1894 | } else { |
| 1895 | /* We're doing malloc then free here, so record the difference. */ |
| 1896 | old_size = tc->size; |
| 1897 | new_size = size; |
| 1898 | new_ptr = malloc(size + TC_HDR_SIZE); |
| 1899 | if (new_ptr) { |
| 1900 | memcpy(new_ptr, tc, MIN(tc->size, size) + TC_HDR_SIZE); |
| 1901 | free(tc); |
| 1902 | } |
| 1903 | } |
| 1904 | #else |
| 1905 | if (pool_hdr) { |
| 1906 | struct talloc_chunk *pool_tc; |
| 1907 | void *next_tc = tc_next_chunk(tc); |
| 1908 | size_t old_chunk_size = TC_ALIGN16(TC_HDR_SIZE + tc->size); |
| 1909 | size_t new_chunk_size = TC_ALIGN16(TC_HDR_SIZE + size); |
| 1910 | size_t space_needed; |
| 1911 | size_t space_left; |
| 1912 | unsigned int chunk_count = pool_hdr->object_count; |
| 1913 | |
| 1914 | pool_tc = talloc_chunk_from_pool(pool_hdr); |
| 1915 | if (!(pool_tc->flags & TALLOC_FLAG_FREE)) { |
| 1916 | chunk_count -= 1; |
| 1917 | } |
| 1918 | |
| 1919 | if (chunk_count == 1) { |
| 1920 | /* |
| 1921 | * optimize for the case where 'tc' is the only |
| 1922 | * chunk in the pool. |
| 1923 | */ |
| 1924 | char *start = tc_pool_first_chunk(pool_hdr); |
| 1925 | space_needed = new_chunk_size; |
| 1926 | space_left = (char *)tc_pool_end(pool_hdr) - start; |
| 1927 | |
| 1928 | if (space_left >= space_needed) { |
| 1929 | size_t old_used = TC_HDR_SIZE + tc->size; |
| 1930 | size_t new_used = TC_HDR_SIZE + size; |
| 1931 | new_ptr = start; |
| 1932 | |
| 1933 | #if defined(DEVELOPER) && defined(VALGRIND_MAKE_MEM_UNDEFINED) |
| 1934 | { |
| 1935 | /* |
| 1936 | * The area from |
| 1937 | * start -> tc may have |
| 1938 | * been freed and thus been marked as |
| 1939 | * VALGRIND_MEM_NOACCESS. Set it to |
| 1940 | * VALGRIND_MEM_UNDEFINED so we can |
| 1941 | * copy into it without valgrind errors. |
| 1942 | * We can't just mark |
| 1943 | * new_ptr -> new_ptr + old_used |
| 1944 | * as this may overlap on top of tc, |
| 1945 | * (which is why we use memmove, not |
| 1946 | * memcpy below) hence the MIN. |
| 1947 | */ |
| 1948 | size_t undef_len = MIN((((char *)tc) - ((char *)new_ptr)),old_used); |
| 1949 | VALGRIND_MAKE_MEM_UNDEFINED(new_ptr, undef_len); |
| 1950 | } |
| 1951 | #endif |
| 1952 | |
| 1953 | memmove(new_ptr, tc, old_used); |
| 1954 | |
| 1955 | tc = (struct talloc_chunk *)new_ptr; |
| 1956 | TC_UNDEFINE_GROW_CHUNK(tc, size); |
| 1957 | |
| 1958 | /* |
| 1959 | * first we do not align the pool pointer |
| 1960 | * because we want to invalidate the padding |
| 1961 | * too. |
| 1962 | */ |
| 1963 | pool_hdr->end = new_used + (char *)new_ptr; |
| 1964 | tc_invalidate_pool(pool_hdr); |
| 1965 | |
| 1966 | /* now the aligned pointer */ |
| 1967 | pool_hdr->end = new_chunk_size + (char *)new_ptr; |
| 1968 | goto got_new_ptr; |
| 1969 | } |
| 1970 | |
| 1971 | next_tc = NULL; |
| 1972 | } |
| 1973 | |
| 1974 | if (new_chunk_size == old_chunk_size) { |
| 1975 | TC_UNDEFINE_GROW_CHUNK(tc, size); |
| 1976 | _talloc_chunk_set_not_free(tc); |
| 1977 | tc->size = size; |
| 1978 | return ptr; |
| 1979 | } |
| 1980 | |
| 1981 | if (next_tc == pool_hdr->end) { |
| 1982 | /* |
| 1983 | * optimize for the case where 'tc' is the last |
| 1984 | * chunk in the pool. |
| 1985 | */ |
| 1986 | space_needed = new_chunk_size - old_chunk_size; |
| 1987 | space_left = tc_pool_space_left(pool_hdr); |
| 1988 | |
| 1989 | if (space_left >= space_needed) { |
| 1990 | TC_UNDEFINE_GROW_CHUNK(tc, size); |
| 1991 | _talloc_chunk_set_not_free(tc); |
| 1992 | tc->size = size; |
| 1993 | pool_hdr->end = tc_next_chunk(tc); |
| 1994 | return ptr; |
| 1995 | } |
| 1996 | } |
| 1997 | |
| 1998 | new_ptr = tc_alloc_pool(tc, size + TC_HDR_SIZE, 0); |
| 1999 | |
| 2000 | if (new_ptr == NULL) { |
| 2001 | new_ptr = malloc(TC_HDR_SIZE+size); |
| 2002 | malloced = true; |
| 2003 | new_size = size; |
| 2004 | } |
| 2005 | |
| 2006 | if (new_ptr) { |
| 2007 | memcpy(new_ptr, tc, MIN(tc->size,size) + TC_HDR_SIZE); |
| 2008 | |
| 2009 | _tc_free_poolmem(tc, __location__ "_talloc_realloc"); |
| 2010 | } |
| 2011 | } |
| 2012 | else { |
| 2013 | /* We're doing realloc here, so record the difference. */ |
| 2014 | old_size = tc->size; |
| 2015 | new_size = size; |
| 2016 | new_ptr = realloc(tc, size + TC_HDR_SIZE); |
| 2017 | } |
| 2018 | got_new_ptr: |
| 2019 | #endif |
| 2020 | if (unlikely(!new_ptr)) { |
| 2021 | /* |
| 2022 | * Ok, this is a strange spot. We have to put back |
| 2023 | * the old talloc_magic and any flags, except the |
| 2024 | * TALLOC_FLAG_FREE as this was not free'ed by the |
| 2025 | * realloc() call after all |
| 2026 | */ |
| 2027 | _talloc_chunk_set_not_free(tc); |
| 2028 | return NULL; |
| 2029 | } |
| 2030 | |
| 2031 | /* |
| 2032 | * tc is now the new value from realloc(), the old memory we |
| 2033 | * can't access any more and was preemptively marked as |
| 2034 | * TALLOC_FLAG_FREE before the call. Now we mark it as not |
| 2035 | * free again |
| 2036 | */ |
| 2037 | tc = (struct talloc_chunk *)new_ptr; |
| 2038 | _talloc_chunk_set_not_free(tc); |
| 2039 | if (malloced) { |
| 2040 | tc->flags &= ~TALLOC_FLAG_POOLMEM; |
| 2041 | } |
| 2042 | if (tc->parent) { |
| 2043 | tc->parent->child = tc; |
| 2044 | } |
| 2045 | if (tc->child) { |
| 2046 | tc->child->parent = tc; |
| 2047 | } |
| 2048 | |
| 2049 | if (tc->prev) { |
| 2050 | tc->prev->next = tc; |
| 2051 | } |
| 2052 | if (tc->next) { |
| 2053 | tc->next->prev = tc; |
| 2054 | } |
| 2055 | |
| 2056 | if (new_size > old_size) { |
| 2057 | talloc_memlimit_grow(tc->limit, new_size - old_size); |
| 2058 | } else if (new_size < old_size) { |
| 2059 | talloc_memlimit_shrink(tc->limit, old_size - new_size); |
| 2060 | } |
| 2061 | |
| 2062 | tc->size = size; |
| 2063 | _tc_set_name_const(tc, name); |
| 2064 | |
| 2065 | return TC_PTR_FROM_CHUNK(tc); |
| 2066 | } |
| 2067 | |
| 2068 | /* |
| 2069 | a wrapper around talloc_steal() for situations where you are moving a pointer |
| 2070 | between two structures, and want the old pointer to be set to NULL |
| 2071 | */ |
| 2072 | _PUBLIC_ void *_talloc_move(const void *new_ctx, const void *_pptr) |
| 2073 | { |
| 2074 | const void **pptr = discard_const_p(const void *,_pptr); |
| 2075 | void *ret = talloc_steal(new_ctx, discard_const_p(void, *pptr)); |
| 2076 | (*pptr) = NULL; |
| 2077 | return ret; |
| 2078 | } |
| 2079 | |
| 2080 | enum talloc_mem_count_type { |
| 2081 | TOTAL_MEM_SIZE, |
| 2082 | TOTAL_MEM_BLOCKS, |
| 2083 | TOTAL_MEM_LIMIT, |
| 2084 | }; |
| 2085 | |
| 2086 | static inline size_t _talloc_total_mem_internal(const void *ptr, |
| 2087 | enum talloc_mem_count_type type, |
| 2088 | struct talloc_memlimit *old_limit, |
| 2089 | struct talloc_memlimit *new_limit) |
| 2090 | { |
| 2091 | size_t total = 0; |
| 2092 | struct talloc_chunk *c, *tc; |
| 2093 | |
| 2094 | if (ptr == NULL) { |
| 2095 | ptr = null_context; |
| 2096 | } |
| 2097 | if (ptr == NULL) { |
| 2098 | return 0; |
| 2099 | } |
| 2100 | |
| 2101 | tc = talloc_chunk_from_ptr(ptr); |
| 2102 | |
| 2103 | if (old_limit || new_limit) { |
| 2104 | if (tc->limit && tc->limit->upper == old_limit) { |
| 2105 | tc->limit->upper = new_limit; |
| 2106 | } |
| 2107 | } |
| 2108 | |
| 2109 | /* optimize in the memlimits case */ |
| 2110 | if (type == TOTAL_MEM_LIMIT && |
| 2111 | tc->limit != NULL && |
| 2112 | tc->limit != old_limit && |
| 2113 | tc->limit->parent == tc) { |
| 2114 | return tc->limit->cur_size; |
| 2115 | } |
| 2116 | |
| 2117 | if (tc->flags & TALLOC_FLAG_LOOP) { |
| 2118 | return 0; |
| 2119 | } |
| 2120 | |
| 2121 | tc->flags |= TALLOC_FLAG_LOOP; |
| 2122 | |
| 2123 | if (old_limit || new_limit) { |
| 2124 | if (old_limit == tc->limit) { |
| 2125 | tc->limit = new_limit; |
| 2126 | } |
| 2127 | } |
| 2128 | |
| 2129 | switch (type) { |
| 2130 | case TOTAL_MEM_SIZE: |
| 2131 | if (likely(tc->name != TALLOC_MAGIC_REFERENCE)) { |
| 2132 | total = tc->size; |
| 2133 | } |
| 2134 | break; |
| 2135 | case TOTAL_MEM_BLOCKS: |
| 2136 | total++; |
| 2137 | break; |
| 2138 | case TOTAL_MEM_LIMIT: |
| 2139 | if (likely(tc->name != TALLOC_MAGIC_REFERENCE)) { |
| 2140 | /* |
| 2141 | * Don't count memory allocated from a pool |
| 2142 | * when calculating limits. Only count the |
| 2143 | * pool itself. |
| 2144 | */ |
| 2145 | if (!(tc->flags & TALLOC_FLAG_POOLMEM)) { |
| 2146 | if (tc->flags & TALLOC_FLAG_POOL) { |
| 2147 | /* |
| 2148 | * If this is a pool, the allocated |
| 2149 | * size is in the pool header, and |
| 2150 | * remember to add in the prefix |
| 2151 | * length. |
| 2152 | */ |
| 2153 | struct talloc_pool_hdr *pool_hdr |
| 2154 | = talloc_pool_from_chunk(tc); |
| 2155 | total = pool_hdr->poolsize + |
| 2156 | TC_HDR_SIZE + |
| 2157 | TP_HDR_SIZE; |
| 2158 | } else { |
| 2159 | total = tc->size + TC_HDR_SIZE; |
| 2160 | } |
| 2161 | } |
| 2162 | } |
| 2163 | break; |
| 2164 | } |
| 2165 | for (c = tc->child; c; c = c->next) { |
| 2166 | total += _talloc_total_mem_internal(TC_PTR_FROM_CHUNK(c), type, |
| 2167 | old_limit, new_limit); |
| 2168 | } |
| 2169 | |
| 2170 | tc->flags &= ~TALLOC_FLAG_LOOP; |
| 2171 | |
| 2172 | return total; |
| 2173 | } |
| 2174 | |
| 2175 | /* |
| 2176 | return the total size of a talloc pool (subtree) |
| 2177 | */ |
| 2178 | _PUBLIC_ size_t talloc_total_size(const void *ptr) |
| 2179 | { |
| 2180 | return _talloc_total_mem_internal(ptr, TOTAL_MEM_SIZE, NULL, NULL); |
| 2181 | } |
| 2182 | |
| 2183 | /* |
| 2184 | return the total number of blocks in a talloc pool (subtree) |
| 2185 | */ |
| 2186 | _PUBLIC_ size_t talloc_total_blocks(const void *ptr) |
| 2187 | { |
| 2188 | return _talloc_total_mem_internal(ptr, TOTAL_MEM_BLOCKS, NULL, NULL); |
| 2189 | } |
| 2190 | |
| 2191 | /* |
| 2192 | return the number of external references to a pointer |
| 2193 | */ |
| 2194 | _PUBLIC_ size_t talloc_reference_count(const void *ptr) |
| 2195 | { |
| 2196 | struct talloc_chunk *tc = talloc_chunk_from_ptr(ptr); |
| 2197 | struct talloc_reference_handle *h; |
| 2198 | size_t ret = 0; |
| 2199 | |
| 2200 | for (h=tc->refs;h;h=h->next) { |
| 2201 | ret++; |
| 2202 | } |
| 2203 | return ret; |
| 2204 | } |
| 2205 | |
| 2206 | /* |
| 2207 | report on memory usage by all children of a pointer, giving a full tree view |
| 2208 | */ |
| 2209 | _PUBLIC_ void talloc_report_depth_cb(const void *ptr, int depth, int max_depth, |
| 2210 | void (*callback)(const void *ptr, |
| 2211 | int depth, int max_depth, |
| 2212 | int is_ref, |
| 2213 | void *private_data), |
| 2214 | void *private_data) |
| 2215 | { |
| 2216 | struct talloc_chunk *c, *tc; |
| 2217 | |
| 2218 | if (ptr == NULL) { |
| 2219 | ptr = null_context; |
| 2220 | } |
| 2221 | if (ptr == NULL) return; |
| 2222 | |
| 2223 | tc = talloc_chunk_from_ptr(ptr); |
| 2224 | |
| 2225 | if (tc->flags & TALLOC_FLAG_LOOP) { |
| 2226 | return; |
| 2227 | } |
| 2228 | |
| 2229 | callback(ptr, depth, max_depth, 0, private_data); |
| 2230 | |
| 2231 | if (max_depth >= 0 && depth >= max_depth) { |
| 2232 | return; |
| 2233 | } |
| 2234 | |
| 2235 | tc->flags |= TALLOC_FLAG_LOOP; |
| 2236 | for (c=tc->child;c;c=c->next) { |
| 2237 | if (c->name == TALLOC_MAGIC_REFERENCE) { |
| 2238 | struct talloc_reference_handle *h = (struct talloc_reference_handle *)TC_PTR_FROM_CHUNK(c); |
| 2239 | callback(h->ptr, depth + 1, max_depth, 1, private_data); |
| 2240 | } else { |
| 2241 | talloc_report_depth_cb(TC_PTR_FROM_CHUNK(c), depth + 1, max_depth, callback, private_data); |
| 2242 | } |
| 2243 | } |
| 2244 | tc->flags &= ~TALLOC_FLAG_LOOP; |
| 2245 | } |
| 2246 | |
| 2247 | static void talloc_report_depth_FILE_helper(const void *ptr, int depth, int max_depth, int is_ref, void *_f) |
| 2248 | { |
| 2249 | const char *name = __talloc_get_name(ptr); |
| 2250 | struct talloc_chunk *tc; |
| 2251 | FILE *f = (FILE *)_f; |
| 2252 | |
| 2253 | if (is_ref) { |
Harald Welte | 189f43d | 2019-04-17 21:19:04 +0200 | [diff] [blame] | 2254 | fprintf(f, "%*sreference to: %s\r\n", depth*4, "", name); |
Harald Welte | 5df0be6 | 2019-04-17 20:54:29 +0200 | [diff] [blame] | 2255 | return; |
| 2256 | } |
| 2257 | |
| 2258 | tc = talloc_chunk_from_ptr(ptr); |
| 2259 | if (tc->limit && tc->limit->parent == tc) { |
| 2260 | fprintf(f, "%*s%-30s is a memlimit context" |
Harald Welte | 189f43d | 2019-04-17 21:19:04 +0200 | [diff] [blame] | 2261 | " (max_size = %lu bytes, cur_size = %lu bytes)\r\n", |
Harald Welte | 5df0be6 | 2019-04-17 20:54:29 +0200 | [diff] [blame] | 2262 | depth*4, "", |
| 2263 | name, |
| 2264 | (unsigned long)tc->limit->max_size, |
| 2265 | (unsigned long)tc->limit->cur_size); |
| 2266 | } |
| 2267 | |
| 2268 | if (depth == 0) { |
Harald Welte | 189f43d | 2019-04-17 21:19:04 +0200 | [diff] [blame] | 2269 | fprintf(f,"%stalloc report on '%s' (total %6lu bytes in %3lu blocks)\r", |
Harald Welte | 5df0be6 | 2019-04-17 20:54:29 +0200 | [diff] [blame] | 2270 | (max_depth < 0 ? "full " :""), name, |
| 2271 | (unsigned long)talloc_total_size(ptr), |
| 2272 | (unsigned long)talloc_total_blocks(ptr)); |
| 2273 | return; |
| 2274 | } |
| 2275 | |
Harald Welte | 189f43d | 2019-04-17 21:19:04 +0200 | [diff] [blame] | 2276 | fprintf(f, "%*s%-30s contains %6lu bytes in %3lu blocks (ref %d) %p\r\n", |
Harald Welte | 5df0be6 | 2019-04-17 20:54:29 +0200 | [diff] [blame] | 2277 | depth*4, "", |
| 2278 | name, |
| 2279 | (unsigned long)talloc_total_size(ptr), |
| 2280 | (unsigned long)talloc_total_blocks(ptr), |
| 2281 | (int)talloc_reference_count(ptr), ptr); |
| 2282 | |
| 2283 | #if 0 |
| 2284 | fprintf(f, "content: "); |
| 2285 | if (talloc_total_size(ptr)) { |
| 2286 | int tot = talloc_total_size(ptr); |
| 2287 | int i; |
| 2288 | |
| 2289 | for (i = 0; i < tot; i++) { |
| 2290 | if ((((char *)ptr)[i] > 31) && (((char *)ptr)[i] < 126)) { |
| 2291 | fprintf(f, "%c", ((char *)ptr)[i]); |
| 2292 | } else { |
| 2293 | fprintf(f, "~%02x", ((char *)ptr)[i]); |
| 2294 | } |
| 2295 | } |
| 2296 | } |
Harald Welte | 189f43d | 2019-04-17 21:19:04 +0200 | [diff] [blame] | 2297 | fprintf(f, "\r\n"); |
Harald Welte | 5df0be6 | 2019-04-17 20:54:29 +0200 | [diff] [blame] | 2298 | #endif |
| 2299 | } |
| 2300 | |
| 2301 | /* |
| 2302 | report on memory usage by all children of a pointer, giving a full tree view |
| 2303 | */ |
| 2304 | _PUBLIC_ void talloc_report_depth_file(const void *ptr, int depth, int max_depth, FILE *f) |
| 2305 | { |
| 2306 | if (f) { |
| 2307 | talloc_report_depth_cb(ptr, depth, max_depth, talloc_report_depth_FILE_helper, f); |
| 2308 | fflush(f); |
| 2309 | } |
| 2310 | } |
| 2311 | |
| 2312 | /* |
| 2313 | report on memory usage by all children of a pointer, giving a full tree view |
| 2314 | */ |
| 2315 | _PUBLIC_ void talloc_report_full(const void *ptr, FILE *f) |
| 2316 | { |
| 2317 | talloc_report_depth_file(ptr, 0, -1, f); |
| 2318 | } |
| 2319 | |
| 2320 | /* |
| 2321 | report on memory usage by all children of a pointer |
| 2322 | */ |
| 2323 | _PUBLIC_ void talloc_report(const void *ptr, FILE *f) |
| 2324 | { |
| 2325 | talloc_report_depth_file(ptr, 0, 1, f); |
| 2326 | } |
| 2327 | |
| 2328 | /* |
| 2329 | enable tracking of the NULL context |
| 2330 | */ |
| 2331 | _PUBLIC_ void talloc_enable_null_tracking(void) |
| 2332 | { |
| 2333 | if (null_context == NULL) { |
| 2334 | null_context = _talloc_named_const(NULL, 0, "null_context"); |
| 2335 | if (autofree_context != NULL) { |
| 2336 | talloc_reparent(NULL, null_context, autofree_context); |
| 2337 | } |
| 2338 | } |
| 2339 | } |
| 2340 | |
| 2341 | /* |
| 2342 | enable tracking of the NULL context, not moving the autofree context |
| 2343 | into the NULL context. This is needed for the talloc testsuite |
| 2344 | */ |
| 2345 | _PUBLIC_ void talloc_enable_null_tracking_no_autofree(void) |
| 2346 | { |
| 2347 | if (null_context == NULL) { |
| 2348 | null_context = _talloc_named_const(NULL, 0, "null_context"); |
| 2349 | } |
| 2350 | } |
| 2351 | |
| 2352 | /* |
| 2353 | disable tracking of the NULL context |
| 2354 | */ |
| 2355 | _PUBLIC_ void talloc_disable_null_tracking(void) |
| 2356 | { |
| 2357 | if (null_context != NULL) { |
| 2358 | /* we have to move any children onto the real NULL |
| 2359 | context */ |
| 2360 | struct talloc_chunk *tc, *tc2; |
| 2361 | tc = talloc_chunk_from_ptr(null_context); |
| 2362 | for (tc2 = tc->child; tc2; tc2=tc2->next) { |
| 2363 | if (tc2->parent == tc) tc2->parent = NULL; |
| 2364 | if (tc2->prev == tc) tc2->prev = NULL; |
| 2365 | } |
| 2366 | for (tc2 = tc->next; tc2; tc2=tc2->next) { |
| 2367 | if (tc2->parent == tc) tc2->parent = NULL; |
| 2368 | if (tc2->prev == tc) tc2->prev = NULL; |
| 2369 | } |
| 2370 | tc->child = NULL; |
| 2371 | tc->next = NULL; |
| 2372 | } |
| 2373 | talloc_free(null_context); |
| 2374 | null_context = NULL; |
| 2375 | } |
| 2376 | |
| 2377 | /* |
| 2378 | enable leak reporting on exit |
| 2379 | */ |
| 2380 | _PUBLIC_ void talloc_enable_leak_report(void) |
| 2381 | { |
| 2382 | talloc_enable_null_tracking(); |
| 2383 | talloc_report_null = true; |
| 2384 | talloc_setup_atexit(); |
| 2385 | } |
| 2386 | |
| 2387 | /* |
| 2388 | enable full leak reporting on exit |
| 2389 | */ |
| 2390 | _PUBLIC_ void talloc_enable_leak_report_full(void) |
| 2391 | { |
| 2392 | talloc_enable_null_tracking(); |
| 2393 | talloc_report_null_full = true; |
| 2394 | talloc_setup_atexit(); |
| 2395 | } |
| 2396 | |
| 2397 | /* |
| 2398 | talloc and zero memory. |
| 2399 | */ |
| 2400 | _PUBLIC_ void *_talloc_zero(const void *ctx, size_t size, const char *name) |
| 2401 | { |
| 2402 | void *p = _talloc_named_const(ctx, size, name); |
| 2403 | |
| 2404 | if (p) { |
| 2405 | memset(p, '\0', size); |
| 2406 | } |
| 2407 | |
| 2408 | return p; |
| 2409 | } |
| 2410 | |
| 2411 | /* |
| 2412 | memdup with a talloc. |
| 2413 | */ |
| 2414 | _PUBLIC_ void *_talloc_memdup(const void *t, const void *p, size_t size, const char *name) |
| 2415 | { |
| 2416 | void *newp = _talloc_named_const(t, size, name); |
| 2417 | |
| 2418 | if (likely(newp)) { |
| 2419 | memcpy(newp, p, size); |
| 2420 | } |
| 2421 | |
| 2422 | return newp; |
| 2423 | } |
| 2424 | |
| 2425 | static inline char *__talloc_strlendup(const void *t, const char *p, size_t len) |
| 2426 | { |
| 2427 | char *ret; |
| 2428 | struct talloc_chunk *tc; |
| 2429 | |
| 2430 | ret = (char *)__talloc(t, len + 1, &tc); |
| 2431 | if (unlikely(!ret)) return NULL; |
| 2432 | |
| 2433 | memcpy(ret, p, len); |
| 2434 | ret[len] = 0; |
| 2435 | |
| 2436 | _tc_set_name_const(tc, ret); |
| 2437 | return ret; |
| 2438 | } |
| 2439 | |
| 2440 | /* |
| 2441 | strdup with a talloc |
| 2442 | */ |
| 2443 | _PUBLIC_ char *talloc_strdup(const void *t, const char *p) |
| 2444 | { |
| 2445 | if (unlikely(!p)) return NULL; |
| 2446 | return __talloc_strlendup(t, p, strlen(p)); |
| 2447 | } |
| 2448 | |
| 2449 | /* |
| 2450 | strndup with a talloc |
| 2451 | */ |
| 2452 | _PUBLIC_ char *talloc_strndup(const void *t, const char *p, size_t n) |
| 2453 | { |
| 2454 | if (unlikely(!p)) return NULL; |
| 2455 | return __talloc_strlendup(t, p, strnlen(p, n)); |
| 2456 | } |
| 2457 | |
| 2458 | static inline char *__talloc_strlendup_append(char *s, size_t slen, |
| 2459 | const char *a, size_t alen) |
| 2460 | { |
| 2461 | char *ret; |
| 2462 | |
| 2463 | ret = talloc_realloc(NULL, s, char, slen + alen + 1); |
| 2464 | if (unlikely(!ret)) return NULL; |
| 2465 | |
| 2466 | /* append the string and the trailing \0 */ |
| 2467 | memcpy(&ret[slen], a, alen); |
| 2468 | ret[slen+alen] = 0; |
| 2469 | |
| 2470 | _tc_set_name_const(talloc_chunk_from_ptr(ret), ret); |
| 2471 | return ret; |
| 2472 | } |
| 2473 | |
| 2474 | /* |
| 2475 | * Appends at the end of the string. |
| 2476 | */ |
| 2477 | _PUBLIC_ char *talloc_strdup_append(char *s, const char *a) |
| 2478 | { |
| 2479 | if (unlikely(!s)) { |
| 2480 | return talloc_strdup(NULL, a); |
| 2481 | } |
| 2482 | |
| 2483 | if (unlikely(!a)) { |
| 2484 | return s; |
| 2485 | } |
| 2486 | |
| 2487 | return __talloc_strlendup_append(s, strlen(s), a, strlen(a)); |
| 2488 | } |
| 2489 | |
| 2490 | /* |
| 2491 | * Appends at the end of the talloc'ed buffer, |
| 2492 | * not the end of the string. |
| 2493 | */ |
| 2494 | _PUBLIC_ char *talloc_strdup_append_buffer(char *s, const char *a) |
| 2495 | { |
| 2496 | size_t slen; |
| 2497 | |
| 2498 | if (unlikely(!s)) { |
| 2499 | return talloc_strdup(NULL, a); |
| 2500 | } |
| 2501 | |
| 2502 | if (unlikely(!a)) { |
| 2503 | return s; |
| 2504 | } |
| 2505 | |
| 2506 | slen = talloc_get_size(s); |
| 2507 | if (likely(slen > 0)) { |
| 2508 | slen--; |
| 2509 | } |
| 2510 | |
| 2511 | return __talloc_strlendup_append(s, slen, a, strlen(a)); |
| 2512 | } |
| 2513 | |
| 2514 | /* |
| 2515 | * Appends at the end of the string. |
| 2516 | */ |
| 2517 | _PUBLIC_ char *talloc_strndup_append(char *s, const char *a, size_t n) |
| 2518 | { |
| 2519 | if (unlikely(!s)) { |
| 2520 | return talloc_strndup(NULL, a, n); |
| 2521 | } |
| 2522 | |
| 2523 | if (unlikely(!a)) { |
| 2524 | return s; |
| 2525 | } |
| 2526 | |
| 2527 | return __talloc_strlendup_append(s, strlen(s), a, strnlen(a, n)); |
| 2528 | } |
| 2529 | |
| 2530 | /* |
| 2531 | * Appends at the end of the talloc'ed buffer, |
| 2532 | * not the end of the string. |
| 2533 | */ |
| 2534 | _PUBLIC_ char *talloc_strndup_append_buffer(char *s, const char *a, size_t n) |
| 2535 | { |
| 2536 | size_t slen; |
| 2537 | |
| 2538 | if (unlikely(!s)) { |
| 2539 | return talloc_strndup(NULL, a, n); |
| 2540 | } |
| 2541 | |
| 2542 | if (unlikely(!a)) { |
| 2543 | return s; |
| 2544 | } |
| 2545 | |
| 2546 | slen = talloc_get_size(s); |
| 2547 | if (likely(slen > 0)) { |
| 2548 | slen--; |
| 2549 | } |
| 2550 | |
| 2551 | return __talloc_strlendup_append(s, slen, a, strnlen(a, n)); |
| 2552 | } |
| 2553 | |
| 2554 | #ifndef HAVE_VA_COPY |
| 2555 | #ifdef HAVE___VA_COPY |
| 2556 | #define va_copy(dest, src) __va_copy(dest, src) |
| 2557 | #else |
| 2558 | #define va_copy(dest, src) (dest) = (src) |
| 2559 | #endif |
| 2560 | #endif |
| 2561 | |
| 2562 | static struct talloc_chunk *_vasprintf_tc(const void *t, |
| 2563 | const char *fmt, |
| 2564 | va_list ap) PRINTF_ATTRIBUTE(2,0); |
| 2565 | |
| 2566 | static struct talloc_chunk *_vasprintf_tc(const void *t, |
| 2567 | const char *fmt, |
| 2568 | va_list ap) |
| 2569 | { |
| 2570 | int vlen; |
| 2571 | size_t len; |
| 2572 | char *ret; |
| 2573 | va_list ap2; |
| 2574 | struct talloc_chunk *tc; |
| 2575 | char buf[1024]; |
| 2576 | |
| 2577 | /* this call looks strange, but it makes it work on older solaris boxes */ |
| 2578 | va_copy(ap2, ap); |
| 2579 | vlen = vsnprintf(buf, sizeof(buf), fmt, ap2); |
| 2580 | va_end(ap2); |
| 2581 | if (unlikely(vlen < 0)) { |
| 2582 | return NULL; |
| 2583 | } |
| 2584 | len = vlen; |
| 2585 | if (unlikely(len + 1 < len)) { |
| 2586 | return NULL; |
| 2587 | } |
| 2588 | |
| 2589 | ret = (char *)__talloc(t, len+1, &tc); |
| 2590 | if (unlikely(!ret)) return NULL; |
| 2591 | |
| 2592 | if (len < sizeof(buf)) { |
| 2593 | memcpy(ret, buf, len+1); |
| 2594 | } else { |
| 2595 | va_copy(ap2, ap); |
| 2596 | vsnprintf(ret, len+1, fmt, ap2); |
| 2597 | va_end(ap2); |
| 2598 | } |
| 2599 | |
| 2600 | _tc_set_name_const(tc, ret); |
| 2601 | return tc; |
| 2602 | } |
| 2603 | |
| 2604 | _PUBLIC_ char *talloc_vasprintf(const void *t, const char *fmt, va_list ap) |
| 2605 | { |
| 2606 | struct talloc_chunk *tc = _vasprintf_tc(t, fmt, ap); |
| 2607 | if (tc == NULL) { |
| 2608 | return NULL; |
| 2609 | } |
| 2610 | return TC_PTR_FROM_CHUNK(tc); |
| 2611 | } |
| 2612 | |
| 2613 | |
| 2614 | /* |
| 2615 | Perform string formatting, and return a pointer to newly allocated |
| 2616 | memory holding the result, inside a memory pool. |
| 2617 | */ |
| 2618 | _PUBLIC_ char *talloc_asprintf(const void *t, const char *fmt, ...) |
| 2619 | { |
| 2620 | va_list ap; |
| 2621 | char *ret; |
| 2622 | |
| 2623 | va_start(ap, fmt); |
| 2624 | ret = talloc_vasprintf(t, fmt, ap); |
| 2625 | va_end(ap); |
| 2626 | return ret; |
| 2627 | } |
| 2628 | |
| 2629 | static inline char *__talloc_vaslenprintf_append(char *s, size_t slen, |
| 2630 | const char *fmt, va_list ap) |
| 2631 | PRINTF_ATTRIBUTE(3,0); |
| 2632 | |
| 2633 | static inline char *__talloc_vaslenprintf_append(char *s, size_t slen, |
| 2634 | const char *fmt, va_list ap) |
| 2635 | { |
| 2636 | ssize_t alen; |
| 2637 | va_list ap2; |
| 2638 | char c; |
| 2639 | |
| 2640 | va_copy(ap2, ap); |
| 2641 | alen = vsnprintf(&c, 1, fmt, ap2); |
| 2642 | va_end(ap2); |
| 2643 | |
| 2644 | if (alen <= 0) { |
| 2645 | /* Either the vsnprintf failed or the format resulted in |
| 2646 | * no characters being formatted. In the former case, we |
| 2647 | * ought to return NULL, in the latter we ought to return |
| 2648 | * the original string. Most current callers of this |
| 2649 | * function expect it to never return NULL. |
| 2650 | */ |
| 2651 | return s; |
| 2652 | } |
| 2653 | |
| 2654 | s = talloc_realloc(NULL, s, char, slen + alen + 1); |
| 2655 | if (!s) return NULL; |
| 2656 | |
| 2657 | va_copy(ap2, ap); |
| 2658 | vsnprintf(s + slen, alen + 1, fmt, ap2); |
| 2659 | va_end(ap2); |
| 2660 | |
| 2661 | _tc_set_name_const(talloc_chunk_from_ptr(s), s); |
| 2662 | return s; |
| 2663 | } |
| 2664 | |
| 2665 | /** |
| 2666 | * Realloc @p s to append the formatted result of @p fmt and @p ap, |
| 2667 | * and return @p s, which may have moved. Good for gradually |
| 2668 | * accumulating output into a string buffer. Appends at the end |
| 2669 | * of the string. |
| 2670 | **/ |
| 2671 | _PUBLIC_ char *talloc_vasprintf_append(char *s, const char *fmt, va_list ap) |
| 2672 | { |
| 2673 | if (unlikely(!s)) { |
| 2674 | return talloc_vasprintf(NULL, fmt, ap); |
| 2675 | } |
| 2676 | |
| 2677 | return __talloc_vaslenprintf_append(s, strlen(s), fmt, ap); |
| 2678 | } |
| 2679 | |
| 2680 | /** |
| 2681 | * Realloc @p s to append the formatted result of @p fmt and @p ap, |
| 2682 | * and return @p s, which may have moved. Always appends at the |
| 2683 | * end of the talloc'ed buffer, not the end of the string. |
| 2684 | **/ |
| 2685 | _PUBLIC_ char *talloc_vasprintf_append_buffer(char *s, const char *fmt, va_list ap) |
| 2686 | { |
| 2687 | size_t slen; |
| 2688 | |
| 2689 | if (unlikely(!s)) { |
| 2690 | return talloc_vasprintf(NULL, fmt, ap); |
| 2691 | } |
| 2692 | |
| 2693 | slen = talloc_get_size(s); |
| 2694 | if (likely(slen > 0)) { |
| 2695 | slen--; |
| 2696 | } |
| 2697 | |
| 2698 | return __talloc_vaslenprintf_append(s, slen, fmt, ap); |
| 2699 | } |
| 2700 | |
| 2701 | /* |
| 2702 | Realloc @p s to append the formatted result of @p fmt and return @p |
| 2703 | s, which may have moved. Good for gradually accumulating output |
| 2704 | into a string buffer. |
| 2705 | */ |
| 2706 | _PUBLIC_ char *talloc_asprintf_append(char *s, const char *fmt, ...) |
| 2707 | { |
| 2708 | va_list ap; |
| 2709 | |
| 2710 | va_start(ap, fmt); |
| 2711 | s = talloc_vasprintf_append(s, fmt, ap); |
| 2712 | va_end(ap); |
| 2713 | return s; |
| 2714 | } |
| 2715 | |
| 2716 | /* |
| 2717 | Realloc @p s to append the formatted result of @p fmt and return @p |
| 2718 | s, which may have moved. Good for gradually accumulating output |
| 2719 | into a buffer. |
| 2720 | */ |
| 2721 | _PUBLIC_ char *talloc_asprintf_append_buffer(char *s, const char *fmt, ...) |
| 2722 | { |
| 2723 | va_list ap; |
| 2724 | |
| 2725 | va_start(ap, fmt); |
| 2726 | s = talloc_vasprintf_append_buffer(s, fmt, ap); |
| 2727 | va_end(ap); |
| 2728 | return s; |
| 2729 | } |
| 2730 | |
| 2731 | /* |
| 2732 | alloc an array, checking for integer overflow in the array size |
| 2733 | */ |
| 2734 | _PUBLIC_ void *_talloc_array(const void *ctx, size_t el_size, unsigned count, const char *name) |
| 2735 | { |
| 2736 | if (count >= MAX_TALLOC_SIZE/el_size) { |
| 2737 | return NULL; |
| 2738 | } |
| 2739 | return _talloc_named_const(ctx, el_size * count, name); |
| 2740 | } |
| 2741 | |
| 2742 | /* |
| 2743 | alloc an zero array, checking for integer overflow in the array size |
| 2744 | */ |
| 2745 | _PUBLIC_ void *_talloc_zero_array(const void *ctx, size_t el_size, unsigned count, const char *name) |
| 2746 | { |
| 2747 | if (count >= MAX_TALLOC_SIZE/el_size) { |
| 2748 | return NULL; |
| 2749 | } |
| 2750 | return _talloc_zero(ctx, el_size * count, name); |
| 2751 | } |
| 2752 | |
| 2753 | /* |
| 2754 | realloc an array, checking for integer overflow in the array size |
| 2755 | */ |
| 2756 | _PUBLIC_ void *_talloc_realloc_array(const void *ctx, void *ptr, size_t el_size, unsigned count, const char *name) |
| 2757 | { |
| 2758 | if (count >= MAX_TALLOC_SIZE/el_size) { |
| 2759 | return NULL; |
| 2760 | } |
| 2761 | return _talloc_realloc(ctx, ptr, el_size * count, name); |
| 2762 | } |
| 2763 | |
| 2764 | /* |
| 2765 | a function version of talloc_realloc(), so it can be passed as a function pointer |
| 2766 | to libraries that want a realloc function (a realloc function encapsulates |
| 2767 | all the basic capabilities of an allocation library, which is why this is useful) |
| 2768 | */ |
| 2769 | _PUBLIC_ void *talloc_realloc_fn(const void *context, void *ptr, size_t size) |
| 2770 | { |
| 2771 | return _talloc_realloc(context, ptr, size, NULL); |
| 2772 | } |
| 2773 | |
| 2774 | |
| 2775 | static int talloc_autofree_destructor(void *ptr) |
| 2776 | { |
| 2777 | autofree_context = NULL; |
| 2778 | return 0; |
| 2779 | } |
| 2780 | |
| 2781 | /* |
| 2782 | return a context which will be auto-freed on exit |
| 2783 | this is useful for reducing the noise in leak reports |
| 2784 | */ |
| 2785 | _PUBLIC_ void *talloc_autofree_context(void) |
| 2786 | { |
| 2787 | if (autofree_context == NULL) { |
| 2788 | autofree_context = _talloc_named_const(NULL, 0, "autofree_context"); |
| 2789 | talloc_set_destructor(autofree_context, talloc_autofree_destructor); |
| 2790 | talloc_setup_atexit(); |
| 2791 | } |
| 2792 | return autofree_context; |
| 2793 | } |
| 2794 | |
| 2795 | _PUBLIC_ size_t talloc_get_size(const void *context) |
| 2796 | { |
| 2797 | struct talloc_chunk *tc; |
| 2798 | |
| 2799 | if (context == NULL) { |
| 2800 | return 0; |
| 2801 | } |
| 2802 | |
| 2803 | tc = talloc_chunk_from_ptr(context); |
| 2804 | |
| 2805 | return tc->size; |
| 2806 | } |
| 2807 | |
| 2808 | /* |
| 2809 | find a parent of this context that has the given name, if any |
| 2810 | */ |
| 2811 | _PUBLIC_ void *talloc_find_parent_byname(const void *context, const char *name) |
| 2812 | { |
| 2813 | struct talloc_chunk *tc; |
| 2814 | |
| 2815 | if (context == NULL) { |
| 2816 | return NULL; |
| 2817 | } |
| 2818 | |
| 2819 | tc = talloc_chunk_from_ptr(context); |
| 2820 | while (tc) { |
| 2821 | if (tc->name && strcmp(tc->name, name) == 0) { |
| 2822 | return TC_PTR_FROM_CHUNK(tc); |
| 2823 | } |
| 2824 | while (tc && tc->prev) tc = tc->prev; |
| 2825 | if (tc) { |
| 2826 | tc = tc->parent; |
| 2827 | } |
| 2828 | } |
| 2829 | return NULL; |
| 2830 | } |
| 2831 | |
| 2832 | /* |
| 2833 | show the parentage of a context |
| 2834 | */ |
| 2835 | _PUBLIC_ void talloc_show_parents(const void *context, FILE *file) |
| 2836 | { |
| 2837 | struct talloc_chunk *tc; |
| 2838 | |
| 2839 | if (context == NULL) { |
Harald Welte | 189f43d | 2019-04-17 21:19:04 +0200 | [diff] [blame] | 2840 | fprintf(file, "talloc no parents for NULL\r\n"); |
Harald Welte | 5df0be6 | 2019-04-17 20:54:29 +0200 | [diff] [blame] | 2841 | return; |
| 2842 | } |
| 2843 | |
| 2844 | tc = talloc_chunk_from_ptr(context); |
Harald Welte | 189f43d | 2019-04-17 21:19:04 +0200 | [diff] [blame] | 2845 | fprintf(file, "talloc parents of '%s'\r\n", __talloc_get_name(context)); |
Harald Welte | 5df0be6 | 2019-04-17 20:54:29 +0200 | [diff] [blame] | 2846 | while (tc) { |
Harald Welte | 189f43d | 2019-04-17 21:19:04 +0200 | [diff] [blame] | 2847 | fprintf(file, "\t'%s'\r\n", __talloc_get_name(TC_PTR_FROM_CHUNK(tc))); |
Harald Welte | 5df0be6 | 2019-04-17 20:54:29 +0200 | [diff] [blame] | 2848 | while (tc && tc->prev) tc = tc->prev; |
| 2849 | if (tc) { |
| 2850 | tc = tc->parent; |
| 2851 | } |
| 2852 | } |
| 2853 | fflush(file); |
| 2854 | } |
| 2855 | |
| 2856 | /* |
| 2857 | return 1 if ptr is a parent of context |
| 2858 | */ |
| 2859 | static int _talloc_is_parent(const void *context, const void *ptr, int depth) |
| 2860 | { |
| 2861 | struct talloc_chunk *tc; |
| 2862 | |
| 2863 | if (context == NULL) { |
| 2864 | return 0; |
| 2865 | } |
| 2866 | |
| 2867 | tc = talloc_chunk_from_ptr(context); |
| 2868 | while (tc) { |
| 2869 | if (depth <= 0) { |
| 2870 | return 0; |
| 2871 | } |
| 2872 | if (TC_PTR_FROM_CHUNK(tc) == ptr) return 1; |
| 2873 | while (tc && tc->prev) tc = tc->prev; |
| 2874 | if (tc) { |
| 2875 | tc = tc->parent; |
| 2876 | depth--; |
| 2877 | } |
| 2878 | } |
| 2879 | return 0; |
| 2880 | } |
| 2881 | |
| 2882 | /* |
| 2883 | return 1 if ptr is a parent of context |
| 2884 | */ |
| 2885 | _PUBLIC_ int talloc_is_parent(const void *context, const void *ptr) |
| 2886 | { |
| 2887 | return _talloc_is_parent(context, ptr, TALLOC_MAX_DEPTH); |
| 2888 | } |
| 2889 | |
| 2890 | /* |
| 2891 | return the total size of memory used by this context and all children |
| 2892 | */ |
| 2893 | static inline size_t _talloc_total_limit_size(const void *ptr, |
| 2894 | struct talloc_memlimit *old_limit, |
| 2895 | struct talloc_memlimit *new_limit) |
| 2896 | { |
| 2897 | return _talloc_total_mem_internal(ptr, TOTAL_MEM_LIMIT, |
| 2898 | old_limit, new_limit); |
| 2899 | } |
| 2900 | |
| 2901 | static inline bool talloc_memlimit_check(struct talloc_memlimit *limit, size_t size) |
| 2902 | { |
| 2903 | struct talloc_memlimit *l; |
| 2904 | |
| 2905 | for (l = limit; l != NULL; l = l->upper) { |
| 2906 | if (l->max_size != 0 && |
| 2907 | ((l->max_size <= l->cur_size) || |
| 2908 | (l->max_size - l->cur_size < size))) { |
| 2909 | return false; |
| 2910 | } |
| 2911 | } |
| 2912 | |
| 2913 | return true; |
| 2914 | } |
| 2915 | |
| 2916 | /* |
| 2917 | Update memory limits when freeing a talloc_chunk. |
| 2918 | */ |
| 2919 | static void tc_memlimit_update_on_free(struct talloc_chunk *tc) |
| 2920 | { |
| 2921 | size_t limit_shrink_size; |
| 2922 | |
| 2923 | if (!tc->limit) { |
| 2924 | return; |
| 2925 | } |
| 2926 | |
| 2927 | /* |
| 2928 | * Pool entries don't count. Only the pools |
| 2929 | * themselves are counted as part of the memory |
| 2930 | * limits. Note that this also takes care of |
| 2931 | * nested pools which have both flags |
| 2932 | * TALLOC_FLAG_POOLMEM|TALLOC_FLAG_POOL set. |
| 2933 | */ |
| 2934 | if (tc->flags & TALLOC_FLAG_POOLMEM) { |
| 2935 | return; |
| 2936 | } |
| 2937 | |
| 2938 | /* |
| 2939 | * If we are part of a memory limited context hierarchy |
| 2940 | * we need to subtract the memory used from the counters |
| 2941 | */ |
| 2942 | |
| 2943 | limit_shrink_size = tc->size+TC_HDR_SIZE; |
| 2944 | |
| 2945 | /* |
| 2946 | * If we're deallocating a pool, take into |
| 2947 | * account the prefix size added for the pool. |
| 2948 | */ |
| 2949 | |
| 2950 | if (tc->flags & TALLOC_FLAG_POOL) { |
| 2951 | limit_shrink_size += TP_HDR_SIZE; |
| 2952 | } |
| 2953 | |
| 2954 | talloc_memlimit_shrink(tc->limit, limit_shrink_size); |
| 2955 | |
| 2956 | if (tc->limit->parent == tc) { |
| 2957 | free(tc->limit); |
| 2958 | } |
| 2959 | |
| 2960 | tc->limit = NULL; |
| 2961 | } |
| 2962 | |
| 2963 | /* |
| 2964 | Increase memory limit accounting after a malloc/realloc. |
| 2965 | */ |
| 2966 | static void talloc_memlimit_grow(struct talloc_memlimit *limit, |
| 2967 | size_t size) |
| 2968 | { |
| 2969 | struct talloc_memlimit *l; |
| 2970 | |
| 2971 | for (l = limit; l != NULL; l = l->upper) { |
| 2972 | size_t new_cur_size = l->cur_size + size; |
| 2973 | if (new_cur_size < l->cur_size) { |
Harald Welte | 189f43d | 2019-04-17 21:19:04 +0200 | [diff] [blame] | 2974 | talloc_abort("logic error in talloc_memlimit_grow\r\n"); |
Harald Welte | 5df0be6 | 2019-04-17 20:54:29 +0200 | [diff] [blame] | 2975 | return; |
| 2976 | } |
| 2977 | l->cur_size = new_cur_size; |
| 2978 | } |
| 2979 | } |
| 2980 | |
| 2981 | /* |
| 2982 | Decrease memory limit accounting after a free/realloc. |
| 2983 | */ |
| 2984 | static void talloc_memlimit_shrink(struct talloc_memlimit *limit, |
| 2985 | size_t size) |
| 2986 | { |
| 2987 | struct talloc_memlimit *l; |
| 2988 | |
| 2989 | for (l = limit; l != NULL; l = l->upper) { |
| 2990 | if (l->cur_size < size) { |
Harald Welte | 189f43d | 2019-04-17 21:19:04 +0200 | [diff] [blame] | 2991 | talloc_abort("logic error in talloc_memlimit_shrink\r\n"); |
Harald Welte | 5df0be6 | 2019-04-17 20:54:29 +0200 | [diff] [blame] | 2992 | return; |
| 2993 | } |
| 2994 | l->cur_size = l->cur_size - size; |
| 2995 | } |
| 2996 | } |
| 2997 | |
| 2998 | _PUBLIC_ int talloc_set_memlimit(const void *ctx, size_t max_size) |
| 2999 | { |
| 3000 | struct talloc_chunk *tc = talloc_chunk_from_ptr(ctx); |
| 3001 | struct talloc_memlimit *orig_limit; |
| 3002 | struct talloc_memlimit *limit = NULL; |
| 3003 | |
| 3004 | if (tc->limit && tc->limit->parent == tc) { |
| 3005 | tc->limit->max_size = max_size; |
| 3006 | return 0; |
| 3007 | } |
| 3008 | orig_limit = tc->limit; |
| 3009 | |
| 3010 | limit = malloc(sizeof(struct talloc_memlimit)); |
| 3011 | if (limit == NULL) { |
| 3012 | return 1; |
| 3013 | } |
| 3014 | limit->parent = tc; |
| 3015 | limit->max_size = max_size; |
| 3016 | limit->cur_size = _talloc_total_limit_size(ctx, tc->limit, limit); |
| 3017 | |
| 3018 | if (orig_limit) { |
| 3019 | limit->upper = orig_limit; |
| 3020 | } else { |
| 3021 | limit->upper = NULL; |
| 3022 | } |
| 3023 | |
| 3024 | return 0; |
| 3025 | } |