Commit | Line | Data |
---|---|---|
059ec3d9 PH |
1 | /************************************************* |
2 | * Exim - an Internet mail transport agent * | |
3 | *************************************************/ | |
4 | ||
f9ba5e22 | 5 | /* Copyright (c) University of Cambridge 1995 - 2018 */ |
f3ebb786 | 6 | /* Copyright (c) The Exim maintainers 2019 */ |
059ec3d9 PH |
7 | /* See the file NOTICE for conditions of use and distribution. */ |
8 | ||
9 | /* Exim gets and frees all its store through these functions. In the original | |
10 | implementation there was a lot of mallocing and freeing of small bits of store. | |
11 | The philosophy has now changed to a scheme which includes the concept of | |
12 | "stacking pools" of store. For the short-lived processes, there isn't any real | |
13 | need to do any garbage collection, but the stack concept allows quick resetting | |
14 | in places where this seems sensible. | |
15 | ||
16 | Obviously the long-running processes (the daemon, the queue runner, and eximon) | |
17 | must take care not to eat store. | |
18 | ||
19 | The following different types of store are recognized: | |
20 | ||
21 | . Long-lived, large blocks: This is implemented by retaining the original | |
22 | malloc/free functions, and it used for permanent working buffers and for | |
23 | getting blocks to cut up for the other types. | |
24 | ||
25 | . Long-lived, small blocks: This is used for blocks that have to survive until | |
26 | the process exits. It is implemented as a stacking pool (POOL_PERM). This is | |
27 | functionally the same as store_malloc(), except that the store can't be | |
28 | freed, but I expect it to be more efficient for handling small blocks. | |
29 | ||
30 | . Short-lived, short blocks: Most of the dynamic store falls into this | |
31 | category. It is implemented as a stacking pool (POOL_MAIN) which is reset | |
32 | after accepting a message when multiple messages are received by a single | |
33 | process. Resetting happens at some other times as well, usually fairly | |
34 | locally after some specific processing that needs working store. | |
35 | ||
36 | . There is a separate pool (POOL_SEARCH) that is used only for lookup storage. | |
37 | This means it can be freed when search_tidyup() is called to close down all | |
38 | the lookup caching. | |
f3ebb786 JH |
39 | |
40 | . Orthogonal to the three pool types, there are two classes of memory: untainted | |
41 | and tainted. The latter is used for values derived from untrusted input, and | |
42 | the string-expansion mechanism refuses to operate on such values (obviously, | |
43 | it can expand an untainted value to return a tainted result). The classes | |
44 | are implemented by duplicating the three pool types. Pool resets are requested | |
45 | against the nontainted sibling and apply to both siblings. | |
059ec3d9 PH |
46 | */ |
47 | ||
48 | ||
49 | #include "exim.h" | |
438257ba PP |
50 | /* keep config.h before memcheck.h, for NVALGRIND */ |
51 | #include "config.h" | |
52 | ||
f3ebb786 | 53 | #include <sys/mman.h> |
7f36d675 | 54 | #include "memcheck.h" |
059ec3d9 PH |
55 | |
56 | ||
57 | /* We need to know how to align blocks of data for general use. I'm not sure | |
58 | how to get an alignment factor in general. In the current world, a value of 8 | |
59 | is probably right, and this is sizeof(double) on some systems and sizeof(void | |
60 | *) on others, so take the larger of those. Since everything in this expression | |
61 | is a constant, the compiler should optimize it to a simple constant wherever it | |
62 | appears (I checked that gcc does do this). */ | |
63 | ||
64 | #define alignment \ | |
f3ebb786 | 65 | (sizeof(void *) > sizeof(double) ? sizeof(void *) : sizeof(double)) |
059ec3d9 PH |
66 | |
67 | /* store_reset() will not free the following block if the last used block has | |
68 | less than this much left in it. */ | |
69 | ||
70 | #define STOREPOOL_MIN_SIZE 256 | |
71 | ||
72 | /* Structure describing the beginning of each big block. */ | |
73 | ||
74 | typedef struct storeblock { | |
75 | struct storeblock *next; | |
76 | size_t length; | |
77 | } storeblock; | |
78 | ||
79 | /* Just in case we find ourselves on a system where the structure above has a | |
80 | length that is not a multiple of the alignment, set up a macro for the padded | |
81 | length. */ | |
82 | ||
83 | #define ALIGNED_SIZEOF_STOREBLOCK \ | |
84 | (((sizeof(storeblock) + alignment - 1) / alignment) * alignment) | |
85 | ||
f3ebb786 JH |
86 | /* Size of block to get from malloc to carve up into smaller ones. This |
87 | must be a multiple of the alignment. We assume that 8192 is going to be | |
88 | suitably aligned. */ | |
89 | ||
90 | #define STORE_BLOCK_SIZE (8192 - ALIGNED_SIZEOF_STOREBLOCK) | |
91 | ||
059ec3d9 PH |
92 | /* Variables holding data for the local pools of store. The current pool number |
93 | is held in store_pool, which is global so that it can be changed from outside. | |
94 | Setting the initial length values to -1 forces a malloc for the first call, | |
95 | even if the length is zero (which is used for getting a point to reset to). */ | |
96 | ||
f3ebb786 | 97 | int store_pool = POOL_MAIN; |
059ec3d9 | 98 | |
f3ebb786 JH |
99 | #define NPOOLS 6 |
100 | static storeblock *chainbase[NPOOLS]; | |
101 | static storeblock *current_block[NPOOLS]; | |
102 | static void *next_yield[NPOOLS]; | |
103 | static int yield_length[NPOOLS] = { -1, -1, -1, -1, -1, -1 }; | |
104 | ||
105 | /* The limits of the tainted pools. Tracking these on new allocations enables | |
106 | a fast is_tainted implementation. We assume the kernel only allocates mmaps using | |
107 | one side or the other of data+heap, not both. */ | |
108 | ||
6d5f5caf JH |
109 | void * tainted_base = (void *)-1; |
110 | void * tainted_top = (void *)0; | |
059ec3d9 PH |
111 | |
112 | /* pool_malloc holds the amount of memory used by the store pools; this goes up | |
113 | and down as store is reset or released. nonpool_malloc is the total got by | |
114 | malloc from other calls; this doesn't go down because it is just freed by | |
115 | pointer. */ | |
116 | ||
f3ebb786 JH |
117 | static int pool_malloc; |
118 | static int nonpool_malloc; | |
059ec3d9 PH |
119 | |
120 | /* This variable is set by store_get() to its yield, and by store_reset() to | |
121 | NULL. This enables string_cat() to optimize its store handling for very long | |
122 | strings. That's why the variable is global. */ | |
123 | ||
f3ebb786 JH |
124 | void *store_last_get[NPOOLS]; |
125 | ||
126 | /* These are purely for stats-gathering */ | |
127 | ||
128 | static int nbytes[NPOOLS]; /* current bytes allocated */ | |
129 | static int maxbytes[NPOOLS]; /* max number reached */ | |
130 | static int nblocks[NPOOLS]; /* current number of blocks allocated */ | |
131 | static int maxblocks[NPOOLS]; | |
132 | static int n_nonpool_blocks; /* current number of direct store_malloc() blocks */ | |
133 | static int max_nonpool_blocks; | |
134 | static int max_pool_malloc; /* max value for pool_malloc */ | |
135 | static int max_nonpool_malloc; /* max value for nonpool_malloc */ | |
136 | ||
137 | ||
81a559c8 | 138 | #ifndef COMPILE_UTILITY |
f3ebb786 JH |
139 | static const uschar * pooluse[NPOOLS] = { |
140 | [POOL_MAIN] = US"main", | |
141 | [POOL_PERM] = US"perm", | |
142 | [POOL_SEARCH] = US"search", | |
143 | [POOL_TAINT_MAIN] = US"main", | |
144 | [POOL_TAINT_PERM] = US"perm", | |
145 | [POOL_TAINT_SEARCH] = US"search", | |
146 | }; | |
147 | static const uschar * poolclass[NPOOLS] = { | |
148 | [POOL_MAIN] = US"untainted", | |
149 | [POOL_PERM] = US"untainted", | |
150 | [POOL_SEARCH] = US"untainted", | |
151 | [POOL_TAINT_MAIN] = US"tainted", | |
152 | [POOL_TAINT_PERM] = US"tainted", | |
153 | [POOL_TAINT_SEARCH] = US"tainted", | |
154 | }; | |
81a559c8 | 155 | #endif |
f3ebb786 JH |
156 | |
157 | ||
158 | static void * store_mmap(int, const char *, int); | |
159 | static void * internal_store_malloc(int, const char *, int); | |
65766f1b JH |
160 | static void internal_untainted_free(void *, const char *, int linenumber); |
161 | static void internal_tainted_free(storeblock *, const char *, int linenumber); | |
f3ebb786 JH |
162 | |
163 | /******************************************************************************/ | |
164 | ||
14ca5d2a JH |
165 | /* Slower version check, for use when platform intermixes malloc and mmap area |
166 | addresses. */ | |
167 | ||
168 | BOOL | |
169 | is_tainted_fn(const void * p) | |
170 | { | |
171 | storeblock * b; | |
172 | int pool; | |
173 | ||
174 | for (pool = 0; pool < nelem(chainbase); pool++) | |
175 | if ((b = current_block[pool])) | |
176 | { | |
177 | char * bc = CS b + ALIGNED_SIZEOF_STOREBLOCK; | |
178 | if (CS p >= bc && CS p <= bc + b->length) goto hit; | |
179 | } | |
180 | ||
181 | for (pool = 0; pool < nelem(chainbase); pool++) | |
182 | for (b = chainbase[pool]; b; b = b->next) | |
183 | { | |
184 | char * bc = CS b + ALIGNED_SIZEOF_STOREBLOCK; | |
185 | if (CS p >= bc && CS p <= bc + b->length) goto hit; | |
186 | } | |
187 | return FALSE; | |
188 | ||
189 | hit: | |
190 | return pool >= POOL_TAINT_BASE; | |
191 | } | |
192 | ||
193 | ||
f3ebb786 JH |
194 | void |
195 | die_tainted(const uschar * msg, const uschar * func, int line) | |
196 | { | |
197 | log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Taint mismatch, %s: %s %d\n", | |
198 | msg, func, line); | |
199 | } | |
059ec3d9 PH |
200 | |
201 | ||
202 | /************************************************* | |
203 | * Get a block from the current pool * | |
204 | *************************************************/ | |
205 | ||
206 | /* Running out of store is a total disaster. This function is called via the | |
207 | macro store_get(). It passes back a block of store within the current big | |
208 | block, getting a new one if necessary. The address is saved in | |
209 | store_last_was_get. | |
210 | ||
211 | Arguments: | |
212 | size amount wanted | |
f3ebb786 JH |
213 | func function from which called |
214 | linenumber line number in source file | |
059ec3d9 PH |
215 | |
216 | Returns: pointer to store (panic on malloc failure) | |
217 | */ | |
218 | ||
219 | void * | |
f3ebb786 | 220 | store_get_3(int size, BOOL tainted, const char *func, int linenumber) |
059ec3d9 | 221 | { |
f3ebb786 JH |
222 | int pool = tainted ? store_pool + POOL_TAINT_BASE : store_pool; |
223 | ||
059ec3d9 PH |
224 | /* Round up the size to a multiple of the alignment. Although this looks a |
225 | messy statement, because "alignment" is a constant expression, the compiler can | |
226 | do a reasonable job of optimizing, especially if the value of "alignment" is a | |
227 | power of two. I checked this with -O2, and gcc did very well, compiling it to 4 | |
228 | instructions on a Sparc (alignment = 8). */ | |
229 | ||
230 | if (size % alignment != 0) size += alignment - (size % alignment); | |
231 | ||
232 | /* If there isn't room in the current block, get a new one. The minimum | |
233 | size is STORE_BLOCK_SIZE, and we would expect this to be the norm, since | |
234 | these functions are mostly called for small amounts of store. */ | |
235 | ||
f3ebb786 | 236 | if (size > yield_length[pool]) |
059ec3d9 | 237 | { |
f3ebb786 | 238 | int length = size <= STORE_BLOCK_SIZE ? STORE_BLOCK_SIZE : size; |
059ec3d9 | 239 | int mlength = length + ALIGNED_SIZEOF_STOREBLOCK; |
f3ebb786 | 240 | storeblock * newblock; |
059ec3d9 PH |
241 | |
242 | /* Sometimes store_reset() may leave a block for us; check if we can use it */ | |
243 | ||
f3ebb786 | 244 | if ( (newblock = current_block[pool]) |
64073d9c JH |
245 | && (newblock = newblock->next) |
246 | && newblock->length < length | |
247 | ) | |
059ec3d9 | 248 | { |
64073d9c | 249 | /* Give up on this block, because it's too small */ |
f3ebb786 JH |
250 | nblocks[pool]--; |
251 | if (pool < POOL_TAINT_BASE) | |
65766f1b | 252 | internal_untainted_free(newblock, func, linenumber); |
f3ebb786 | 253 | else |
65766f1b | 254 | internal_tainted_free(newblock, func, linenumber); |
64073d9c | 255 | newblock = NULL; |
059ec3d9 PH |
256 | } |
257 | ||
258 | /* If there was no free block, get a new one */ | |
259 | ||
64073d9c | 260 | if (!newblock) |
059ec3d9 | 261 | { |
f3ebb786 JH |
262 | if ((nbytes[pool] += mlength) > maxbytes[pool]) |
263 | maxbytes[pool] = nbytes[pool]; | |
264 | if ((pool_malloc += mlength) > max_pool_malloc) /* Used in pools */ | |
265 | max_pool_malloc = pool_malloc; | |
266 | nonpool_malloc -= mlength; /* Exclude from overall total */ | |
267 | if (++nblocks[pool] > maxblocks[pool]) | |
268 | maxblocks[pool] = nblocks[pool]; | |
269 | ||
270 | newblock = tainted | |
271 | ? store_mmap(mlength, func, linenumber) | |
272 | : internal_store_malloc(mlength, func, linenumber); | |
059ec3d9 PH |
273 | newblock->next = NULL; |
274 | newblock->length = length; | |
f3ebb786 JH |
275 | |
276 | if (!chainbase[pool]) | |
277 | chainbase[pool] = newblock; | |
64073d9c | 278 | else |
f3ebb786 | 279 | current_block[pool]->next = newblock; |
059ec3d9 PH |
280 | } |
281 | ||
f3ebb786 JH |
282 | current_block[pool] = newblock; |
283 | yield_length[pool] = newblock->length; | |
284 | next_yield[pool] = | |
285 | (void *)(CS current_block[pool] + ALIGNED_SIZEOF_STOREBLOCK); | |
286 | (void) VALGRIND_MAKE_MEM_NOACCESS(next_yield[pool], yield_length[pool]); | |
059ec3d9 PH |
287 | } |
288 | ||
289 | /* There's (now) enough room in the current block; the yield is the next | |
290 | pointer. */ | |
291 | ||
f3ebb786 | 292 | store_last_get[pool] = next_yield[pool]; |
059ec3d9 PH |
293 | |
294 | /* Cut out the debugging stuff for utilities, but stop picky compilers from | |
295 | giving warnings. */ | |
296 | ||
297 | #ifdef COMPILE_UTILITY | |
f3ebb786 | 298 | func = func; |
059ec3d9 PH |
299 | linenumber = linenumber; |
300 | #else | |
301 | DEBUG(D_memory) | |
f3ebb786 JH |
302 | debug_printf("---%d Get %6p %5d %-14s %4d\n", pool, |
303 | store_last_get[pool], size, func, linenumber); | |
059ec3d9 PH |
304 | #endif /* COMPILE_UTILITY */ |
305 | ||
f3ebb786 | 306 | (void) VALGRIND_MAKE_MEM_UNDEFINED(store_last_get[pool], size); |
059ec3d9 PH |
307 | /* Update next pointer and number of bytes left in the current block. */ |
308 | ||
f3ebb786 JH |
309 | next_yield[pool] = (void *)(CS next_yield[pool] + size); |
310 | yield_length[pool] -= size; | |
311 | return store_last_get[pool]; | |
059ec3d9 PH |
312 | } |
313 | ||
314 | ||
315 | ||
316 | /************************************************* | |
317 | * Get a block from the PERM pool * | |
318 | *************************************************/ | |
319 | ||
320 | /* This is just a convenience function, useful when just a single block is to | |
321 | be obtained. | |
322 | ||
323 | Arguments: | |
324 | size amount wanted | |
f3ebb786 JH |
325 | func function from which called |
326 | linenumber line number in source file | |
059ec3d9 PH |
327 | |
328 | Returns: pointer to store (panic on malloc failure) | |
329 | */ | |
330 | ||
331 | void * | |
f3ebb786 | 332 | store_get_perm_3(int size, BOOL tainted, const char *func, int linenumber) |
059ec3d9 PH |
333 | { |
334 | void *yield; | |
335 | int old_pool = store_pool; | |
336 | store_pool = POOL_PERM; | |
f3ebb786 | 337 | yield = store_get_3(size, tainted, func, linenumber); |
059ec3d9 PH |
338 | store_pool = old_pool; |
339 | return yield; | |
340 | } | |
341 | ||
342 | ||
343 | ||
344 | /************************************************* | |
345 | * Extend a block if it is at the top * | |
346 | *************************************************/ | |
347 | ||
348 | /* While reading strings of unknown length, it is often the case that the | |
349 | string is being read into the block at the top of the stack. If it needs to be | |
f3ebb786 | 350 | extended, it is more efficient just to extend within the top block rather than |
059ec3d9 PH |
351 | allocate a new block and then have to copy the data. This function is provided |
352 | for the use of string_cat(), but of course can be used elsewhere too. | |
f3ebb786 | 353 | The block itself is not expanded; only the top allocation from it. |
059ec3d9 PH |
354 | |
355 | Arguments: | |
356 | ptr pointer to store block | |
357 | oldsize current size of the block, as requested by user | |
358 | newsize new size required | |
f3ebb786 | 359 | func function from which called |
059ec3d9 PH |
360 | linenumber line number in source file |
361 | ||
362 | Returns: TRUE if the block is at the top of the stack and has been | |
363 | extended; FALSE if it isn't at the top of the stack, or cannot | |
364 | be extended | |
365 | */ | |
366 | ||
367 | BOOL | |
f3ebb786 JH |
368 | store_extend_3(void *ptr, BOOL tainted, int oldsize, int newsize, |
369 | const char *func, int linenumber) | |
059ec3d9 | 370 | { |
f3ebb786 | 371 | int pool = tainted ? store_pool + POOL_TAINT_BASE : store_pool; |
059ec3d9 PH |
372 | int inc = newsize - oldsize; |
373 | int rounded_oldsize = oldsize; | |
374 | ||
f3ebb786 JH |
375 | /* Check that the block being extended was already of the required taint status; |
376 | refuse to extend if not. */ | |
377 | ||
378 | if (is_tainted(ptr) != tainted) | |
379 | return FALSE; | |
380 | ||
059ec3d9 PH |
381 | if (rounded_oldsize % alignment != 0) |
382 | rounded_oldsize += alignment - (rounded_oldsize % alignment); | |
383 | ||
f3ebb786 JH |
384 | if (CS ptr + rounded_oldsize != CS (next_yield[pool]) || |
385 | inc > yield_length[pool] + rounded_oldsize - oldsize) | |
059ec3d9 PH |
386 | return FALSE; |
387 | ||
388 | /* Cut out the debugging stuff for utilities, but stop picky compilers from | |
389 | giving warnings. */ | |
390 | ||
391 | #ifdef COMPILE_UTILITY | |
f3ebb786 | 392 | func = func; |
059ec3d9 PH |
393 | linenumber = linenumber; |
394 | #else | |
395 | DEBUG(D_memory) | |
f3ebb786 JH |
396 | debug_printf("---%d Ext %6p %5d %-14s %4d\n", pool, ptr, newsize, |
397 | func, linenumber); | |
059ec3d9 PH |
398 | #endif /* COMPILE_UTILITY */ |
399 | ||
400 | if (newsize % alignment != 0) newsize += alignment - (newsize % alignment); | |
f3ebb786 JH |
401 | next_yield[pool] = CS ptr + newsize; |
402 | yield_length[pool] -= newsize - rounded_oldsize; | |
4d8bb202 | 403 | (void) VALGRIND_MAKE_MEM_UNDEFINED(ptr + oldsize, inc); |
059ec3d9 PH |
404 | return TRUE; |
405 | } | |
406 | ||
407 | ||
408 | ||
409 | ||
410 | /************************************************* | |
411 | * Back up to a previous point on the stack * | |
412 | *************************************************/ | |
413 | ||
414 | /* This function resets the next pointer, freeing any subsequent whole blocks | |
f3ebb786 JH |
415 | that are now unused. Call with a cookie obtained from store_mark() only; do |
416 | not call with a pointer returned by store_get(). Both the untainted and tainted | |
417 | pools corresposding to store_pool are reset. | |
059ec3d9 PH |
418 | |
419 | Arguments: | |
f3ebb786 JH |
420 | r place to back up to |
421 | func function from which called | |
059ec3d9 PH |
422 | linenumber line number in source file |
423 | ||
424 | Returns: nothing | |
425 | */ | |
426 | ||
f3ebb786 JH |
427 | static void |
428 | internal_store_reset(void * ptr, int pool, const char *func, int linenumber) | |
059ec3d9 | 429 | { |
cf0812d5 | 430 | storeblock * bb; |
f3ebb786 | 431 | storeblock * b = current_block[pool]; |
cf0812d5 | 432 | char * bc = CS b + ALIGNED_SIZEOF_STOREBLOCK; |
f3ebb786 JH |
433 | int newlength, count; |
434 | #ifndef COMPILE_UTILITY | |
435 | int oldmalloc = pool_malloc; | |
436 | #endif | |
059ec3d9 PH |
437 | |
438 | /* Last store operation was not a get */ | |
439 | ||
f3ebb786 | 440 | store_last_get[pool] = NULL; |
059ec3d9 PH |
441 | |
442 | /* See if the place is in the current block - as it often will be. Otherwise, | |
443 | search for the block in which it lies. */ | |
444 | ||
cf0812d5 | 445 | if (CS ptr < bc || CS ptr > bc + b->length) |
059ec3d9 | 446 | { |
f3ebb786 | 447 | for (b = chainbase[pool]; b; b = b->next) |
059ec3d9 | 448 | { |
cf0812d5 JH |
449 | bc = CS b + ALIGNED_SIZEOF_STOREBLOCK; |
450 | if (CS ptr >= bc && CS ptr <= bc + b->length) break; | |
059ec3d9 | 451 | } |
cf0812d5 | 452 | if (!b) |
438257ba | 453 | log_write(0, LOG_MAIN|LOG_PANIC_DIE, "internal error: store_reset(%p) " |
f3ebb786 | 454 | "failed: pool=%d %-14s %4d", ptr, pool, func, linenumber); |
059ec3d9 PH |
455 | } |
456 | ||
457 | /* Back up, rounding to the alignment if necessary. When testing, flatten | |
458 | the released memory. */ | |
459 | ||
cf0812d5 | 460 | newlength = bc + b->length - CS ptr; |
059ec3d9 | 461 | #ifndef COMPILE_UTILITY |
65a32f85 | 462 | if (debug_store) |
2c9f7ff8 | 463 | { |
f3ebb786 | 464 | assert_no_variables(ptr, newlength, func, linenumber); |
8768d548 | 465 | if (f.running_in_test_harness) |
64073d9c JH |
466 | { |
467 | (void) VALGRIND_MAKE_MEM_DEFINED(ptr, newlength); | |
468 | memset(ptr, 0xF0, newlength); | |
469 | } | |
2c9f7ff8 | 470 | } |
059ec3d9 | 471 | #endif |
4d8bb202 | 472 | (void) VALGRIND_MAKE_MEM_NOACCESS(ptr, newlength); |
f3ebb786 JH |
473 | next_yield[pool] = CS ptr + (newlength % alignment); |
474 | count = yield_length[pool]; | |
475 | count = (yield_length[pool] = newlength - (newlength % alignment)) - count; | |
476 | current_block[pool] = b; | |
477 | ||
478 | /* Free any subsequent block. Do NOT free the first | |
479 | successor, if our current block has less than 256 bytes left. This should | |
480 | prevent us from flapping memory. However, keep this block only when it has | |
481 | the default size. */ | |
482 | ||
483 | if ( yield_length[pool] < STOREPOOL_MIN_SIZE | |
484 | && b->next | |
485 | && b->next->length == STORE_BLOCK_SIZE) | |
7f36d675 | 486 | { |
059ec3d9 | 487 | b = b->next; |
cf0812d5 | 488 | #ifndef COMPILE_UTILITY |
65a32f85 | 489 | if (debug_store) |
cf0812d5 | 490 | assert_no_variables(b, b->length + ALIGNED_SIZEOF_STOREBLOCK, |
f3ebb786 | 491 | func, linenumber); |
cf0812d5 JH |
492 | #endif |
493 | (void) VALGRIND_MAKE_MEM_NOACCESS(CS b + ALIGNED_SIZEOF_STOREBLOCK, | |
4d8bb202 | 494 | b->length - ALIGNED_SIZEOF_STOREBLOCK); |
7f36d675 | 495 | } |
059ec3d9 PH |
496 | |
497 | bb = b->next; | |
498 | b->next = NULL; | |
499 | ||
cf0812d5 | 500 | while ((b = bb)) |
059ec3d9 | 501 | { |
f3ebb786 | 502 | int siz = b->length + ALIGNED_SIZEOF_STOREBLOCK; |
cf0812d5 | 503 | #ifndef COMPILE_UTILITY |
65a32f85 | 504 | if (debug_store) |
cf0812d5 | 505 | assert_no_variables(b, b->length + ALIGNED_SIZEOF_STOREBLOCK, |
f3ebb786 | 506 | func, linenumber); |
cf0812d5 | 507 | #endif |
059ec3d9 | 508 | bb = bb->next; |
f3ebb786 JH |
509 | nbytes[pool] -= siz; |
510 | pool_malloc -= siz; | |
511 | nblocks[pool]--; | |
512 | if (pool < POOL_TAINT_BASE) | |
65766f1b | 513 | internal_untainted_free(b, func, linenumber); |
f3ebb786 | 514 | else |
65766f1b | 515 | internal_tainted_free(b, func, linenumber); |
059ec3d9 PH |
516 | } |
517 | ||
518 | /* Cut out the debugging stuff for utilities, but stop picky compilers from | |
519 | giving warnings. */ | |
520 | ||
521 | #ifdef COMPILE_UTILITY | |
f3ebb786 | 522 | func = func; |
059ec3d9 PH |
523 | linenumber = linenumber; |
524 | #else | |
525 | DEBUG(D_memory) | |
f3ebb786 JH |
526 | debug_printf("---%d Rst %6p %5d %-14s %4d %d\n", pool, ptr, |
527 | count + oldmalloc - pool_malloc, | |
528 | func, linenumber, pool_malloc); | |
529 | #endif /* COMPILE_UTILITY */ | |
530 | } | |
531 | ||
532 | ||
533 | rmark | |
534 | store_reset_3(rmark r, int pool, const char *func, int linenumber) | |
535 | { | |
536 | void ** ptr = r; | |
537 | ||
538 | if (pool >= POOL_TAINT_BASE) | |
539 | log_write(0, LOG_MAIN|LOG_PANIC_DIE, | |
540 | "store_reset called for pool %d: %s %d\n", pool, func, linenumber); | |
541 | if (!r) | |
542 | log_write(0, LOG_MAIN|LOG_PANIC_DIE, | |
543 | "store_reset called with bad mark: %s %d\n", func, linenumber); | |
544 | ||
545 | internal_store_reset(*ptr, pool + POOL_TAINT_BASE, func, linenumber); | |
546 | internal_store_reset(ptr, pool, func, linenumber); | |
547 | return NULL; | |
548 | } | |
549 | ||
550 | ||
551 | ||
552 | /* Free tail-end unused allocation. This lets us allocate a big chunk | |
553 | early, for cases when we only discover later how much was really needed. | |
554 | ||
555 | Can be called with a value from store_get(), or an offset after such. Only | |
556 | the tainted or untainted pool that serviced the store_get() will be affected. | |
557 | ||
558 | This is mostly a cut-down version of internal_store_reset(). | |
559 | XXX needs rationalising | |
560 | */ | |
561 | ||
562 | void | |
563 | store_release_above_3(void *ptr, const char *func, int linenumber) | |
564 | { | |
565 | /* Search all pools' "current" blocks. If it isn't one of those, | |
566 | ignore it (it usually will be). */ | |
567 | ||
568 | for (int pool = 0; pool < nelem(current_block); pool++) | |
059ec3d9 | 569 | { |
f3ebb786 JH |
570 | storeblock * b = current_block[pool]; |
571 | char * bc; | |
572 | int count, newlength; | |
573 | ||
574 | if (!b) | |
575 | continue; | |
576 | ||
577 | bc = CS b + ALIGNED_SIZEOF_STOREBLOCK; | |
578 | if (CS ptr < bc || CS ptr > bc + b->length) | |
579 | continue; | |
580 | ||
581 | /* Last store operation was not a get */ | |
582 | ||
583 | store_last_get[pool] = NULL; | |
584 | ||
585 | /* Back up, rounding to the alignment if necessary. When testing, flatten | |
586 | the released memory. */ | |
587 | ||
588 | newlength = bc + b->length - CS ptr; | |
589 | #ifndef COMPILE_UTILITY | |
590 | if (debug_store) | |
591 | { | |
592 | assert_no_variables(ptr, newlength, func, linenumber); | |
593 | if (f.running_in_test_harness) | |
594 | { | |
595 | (void) VALGRIND_MAKE_MEM_DEFINED(ptr, newlength); | |
596 | memset(ptr, 0xF0, newlength); | |
597 | } | |
598 | } | |
599 | #endif | |
600 | (void) VALGRIND_MAKE_MEM_NOACCESS(ptr, newlength); | |
601 | next_yield[pool] = CS ptr + (newlength % alignment); | |
602 | count = yield_length[pool]; | |
603 | count = (yield_length[pool] = newlength - (newlength % alignment)) - count; | |
604 | ||
605 | /* Cut out the debugging stuff for utilities, but stop picky compilers from | |
606 | giving warnings. */ | |
607 | ||
608 | #ifdef COMPILE_UTILITY | |
609 | func = func; | |
610 | linenumber = linenumber; | |
611 | #else | |
612 | DEBUG(D_memory) | |
613 | debug_printf("---%d Rel %6p %5d %-14s %4d %d\n", pool, ptr, count, | |
614 | func, linenumber, pool_malloc); | |
615 | #endif | |
616 | return; | |
059ec3d9 | 617 | } |
f3ebb786 JH |
618 | #ifndef COMPILE_UTILITY |
619 | DEBUG(D_memory) | |
620 | debug_printf("non-last memory release try: %s %d\n", func, linenumber); | |
621 | #endif | |
059ec3d9 PH |
622 | } |
623 | ||
624 | ||
625 | ||
f3ebb786 JH |
626 | rmark |
627 | store_mark_3(const char *func, int linenumber) | |
628 | { | |
629 | void ** p; | |
630 | ||
631 | if (store_pool >= POOL_TAINT_BASE) | |
632 | log_write(0, LOG_MAIN|LOG_PANIC_DIE, | |
633 | "store_mark called for pool %d: %s %d\n", store_pool, func, linenumber); | |
634 | ||
635 | /* Stash a mark for the tainted-twin release, in the untainted twin. Return | |
636 | a cookie (actually the address in the untainted pool) to the caller. | |
637 | Reset uses the cookie to recover the t-mark, winds back the tainted pool with it | |
638 | and winds back the untainted pool with the cookie. */ | |
639 | ||
640 | p = store_get_3(sizeof(void *), FALSE, func, linenumber); | |
641 | *p = store_get_3(0, TRUE, func, linenumber); | |
642 | return p; | |
643 | } | |
644 | ||
645 | ||
059ec3d9 PH |
646 | |
647 | ||
648 | /************************************************ | |
649 | * Release store * | |
650 | ************************************************/ | |
651 | ||
459fca58 JH |
652 | /* This function checks that the pointer it is given is the first thing in a |
653 | block, and if so, releases that block. | |
059ec3d9 PH |
654 | |
655 | Arguments: | |
656 | block block of store to consider | |
f3ebb786 | 657 | func function from which called |
059ec3d9 PH |
658 | linenumber line number in source file |
659 | ||
660 | Returns: nothing | |
661 | */ | |
662 | ||
459fca58 | 663 | static void |
f3ebb786 | 664 | store_release_3(void * block, int pool, const char * func, int linenumber) |
059ec3d9 | 665 | { |
059ec3d9 PH |
666 | /* It will never be the first block, so no need to check that. */ |
667 | ||
f3ebb786 | 668 | for (storeblock * b = chainbase[pool]; b; b = b->next) |
059ec3d9 | 669 | { |
459fca58 JH |
670 | storeblock * bb = b->next; |
671 | if (bb && CS block == CS bb + ALIGNED_SIZEOF_STOREBLOCK) | |
059ec3d9 | 672 | { |
f3ebb786 | 673 | int siz = bb->length + ALIGNED_SIZEOF_STOREBLOCK; |
059ec3d9 | 674 | b->next = bb->next; |
f3ebb786 JH |
675 | nbytes[pool] -= siz; |
676 | pool_malloc -= siz; | |
677 | nblocks[pool]--; | |
059ec3d9 PH |
678 | |
679 | /* Cut out the debugging stuff for utilities, but stop picky compilers | |
680 | from giving warnings. */ | |
681 | ||
459fca58 | 682 | #ifdef COMPILE_UTILITY |
f3ebb786 | 683 | func = func; |
059ec3d9 | 684 | linenumber = linenumber; |
459fca58 | 685 | #else |
059ec3d9 | 686 | DEBUG(D_memory) |
f3ebb786 JH |
687 | debug_printf("-Release %6p %-20s %4d %d\n", (void *)bb, func, |
688 | linenumber, pool_malloc); | |
459fca58 | 689 | |
8768d548 | 690 | if (f.running_in_test_harness) |
059ec3d9 | 691 | memset(bb, 0xF0, bb->length+ALIGNED_SIZEOF_STOREBLOCK); |
459fca58 | 692 | #endif /* COMPILE_UTILITY */ |
059ec3d9 PH |
693 | |
694 | free(bb); | |
695 | return; | |
696 | } | |
697 | } | |
698 | } | |
699 | ||
700 | ||
459fca58 JH |
701 | /************************************************ |
702 | * Move store * | |
703 | ************************************************/ | |
704 | ||
705 | /* Allocate a new block big enough to expend to the given size and | |
706 | copy the current data into it. Free the old one if possible. | |
707 | ||
708 | This function is specifically provided for use when reading very | |
709 | long strings, e.g. header lines. When the string gets longer than a | |
710 | complete block, it gets copied to a new block. It is helpful to free | |
711 | the old block iff the previous copy of the string is at its start, | |
712 | and therefore the only thing in it. Otherwise, for very long strings, | |
713 | dead store can pile up somewhat disastrously. This function checks that | |
714 | the pointer it is given is the first thing in a block, and that nothing | |
715 | has been allocated since. If so, releases that block. | |
716 | ||
717 | Arguments: | |
718 | block | |
719 | newsize | |
720 | len | |
721 | ||
722 | Returns: new location of data | |
723 | */ | |
724 | ||
725 | void * | |
f3ebb786 JH |
726 | store_newblock_3(void * block, BOOL tainted, int newsize, int len, |
727 | const char * func, int linenumber) | |
459fca58 | 728 | { |
f3ebb786 JH |
729 | int pool = tainted ? store_pool + POOL_TAINT_BASE : store_pool; |
730 | BOOL release_ok = !tainted && store_last_get[pool] == block; | |
731 | uschar * newtext; | |
732 | ||
aaabfafe | 733 | #ifndef MACRO_PREDEF |
f3ebb786 JH |
734 | if (is_tainted(block) != tainted) |
735 | die_tainted(US"store_newblock", CUS func, linenumber); | |
aaabfafe | 736 | #endif |
459fca58 | 737 | |
f3ebb786 | 738 | newtext = store_get(newsize, tainted); |
459fca58 | 739 | memcpy(newtext, block, len); |
f3ebb786 | 740 | if (release_ok) store_release_3(block, pool, func, linenumber); |
459fca58 JH |
741 | return (void *)newtext; |
742 | } | |
743 | ||
744 | ||
059ec3d9 PH |
745 | |
746 | ||
f3ebb786 JH |
747 | /******************************************************************************/ |
748 | static void * | |
749 | store_alloc_tail(void * yield, int size, const char * func, int line, | |
750 | const uschar * type) | |
751 | { | |
752 | if ((nonpool_malloc += size) > max_nonpool_malloc) | |
753 | max_nonpool_malloc = nonpool_malloc; | |
754 | ||
755 | /* Cut out the debugging stuff for utilities, but stop picky compilers from | |
756 | giving warnings. */ | |
757 | ||
758 | #ifdef COMPILE_UTILITY | |
759 | func = func; line = line; type = type; | |
760 | #else | |
761 | ||
762 | /* If running in test harness, spend time making sure all the new store | |
763 | is not filled with zeros so as to catch problems. */ | |
764 | ||
765 | if (f.running_in_test_harness) | |
766 | memset(yield, 0xF0, (size_t)size); | |
767 | DEBUG(D_memory) debug_printf("--%6s %6p %5d bytes\t%-14s %4d\tpool %5d nonpool %5d\n", | |
768 | type, yield, size, func, line, pool_malloc, nonpool_malloc); | |
769 | #endif /* COMPILE_UTILITY */ | |
770 | ||
771 | return yield; | |
772 | } | |
773 | ||
774 | /************************************************* | |
775 | * Mmap store * | |
776 | *************************************************/ | |
777 | ||
778 | static void * | |
779 | store_mmap(int size, const char * func, int line) | |
780 | { | |
781 | void * yield, * top; | |
782 | ||
783 | if (size < 16) size = 16; | |
784 | ||
785 | if (!(yield = mmap(NULL, (size_t)size, | |
786 | PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0))) | |
787 | log_write(0, LOG_MAIN|LOG_PANIC_DIE, "failed to mmap %d bytes of memory: " | |
788 | "called from line %d of %s", size, line, func); | |
789 | ||
790 | if (yield < tainted_base) tainted_base = yield; | |
6d95688d | 791 | if ((top = US yield + size) > tainted_top) tainted_top = top; |
f3ebb786 JH |
792 | |
793 | return store_alloc_tail(yield, size, func, line, US"Mmap"); | |
794 | } | |
795 | ||
059ec3d9 PH |
796 | /************************************************* |
797 | * Malloc store * | |
798 | *************************************************/ | |
799 | ||
800 | /* Running out of store is a total disaster for exim. Some malloc functions | |
801 | do not run happily on very small sizes, nor do they document this fact. This | |
802 | function is called via the macro store_malloc(). | |
803 | ||
804 | Arguments: | |
805 | size amount of store wanted | |
f3ebb786 | 806 | func function from which called |
059ec3d9 PH |
807 | linenumber line number in source file |
808 | ||
809 | Returns: pointer to gotten store (panic on failure) | |
810 | */ | |
811 | ||
f3ebb786 JH |
812 | static void * |
813 | internal_store_malloc(int size, const char *func, int linenumber) | |
059ec3d9 | 814 | { |
f3ebb786 | 815 | void * yield; |
059ec3d9 PH |
816 | |
817 | if (size < 16) size = 16; | |
059ec3d9 | 818 | |
40c90bca | 819 | if (!(yield = malloc((size_t)size))) |
059ec3d9 | 820 | log_write(0, LOG_MAIN|LOG_PANIC_DIE, "failed to malloc %d bytes of memory: " |
f3ebb786 | 821 | "called from line %d in %s", size, linenumber, func); |
059ec3d9 | 822 | |
f3ebb786 JH |
823 | return store_alloc_tail(yield, size, func, linenumber, US"Malloc"); |
824 | } | |
059ec3d9 | 825 | |
f3ebb786 JH |
826 | void * |
827 | store_malloc_3(int size, const char *func, int linenumber) | |
828 | { | |
829 | if (n_nonpool_blocks++ > max_nonpool_blocks) | |
830 | max_nonpool_blocks = n_nonpool_blocks; | |
831 | return internal_store_malloc(size, func, linenumber); | |
059ec3d9 PH |
832 | } |
833 | ||
834 | ||
835 | /************************************************ | |
836 | * Free store * | |
837 | ************************************************/ | |
838 | ||
839 | /* This function is called by the macro store_free(). | |
840 | ||
841 | Arguments: | |
842 | block block of store to free | |
f3ebb786 | 843 | func function from which called |
059ec3d9 PH |
844 | linenumber line number in source file |
845 | ||
846 | Returns: nothing | |
847 | */ | |
848 | ||
f3ebb786 | 849 | static void |
65766f1b | 850 | internal_untainted_free(void * block, const char * func, int linenumber) |
059ec3d9 PH |
851 | { |
852 | #ifdef COMPILE_UTILITY | |
f3ebb786 | 853 | func = func; |
059ec3d9 PH |
854 | linenumber = linenumber; |
855 | #else | |
856 | DEBUG(D_memory) | |
f3ebb786 | 857 | debug_printf("----Free %6p %-20s %4d\n", block, func, linenumber); |
059ec3d9 PH |
858 | #endif /* COMPILE_UTILITY */ |
859 | free(block); | |
860 | } | |
861 | ||
f3ebb786 | 862 | void |
65766f1b | 863 | store_free_3(void * block, const char * func, int linenumber) |
f3ebb786 JH |
864 | { |
865 | n_nonpool_blocks--; | |
65766f1b JH |
866 | internal_untainted_free(block, func, linenumber); |
867 | } | |
868 | ||
869 | /******************************************************************************/ | |
870 | static void | |
871 | internal_tainted_free(storeblock * block, const char * func, int linenumber) | |
872 | { | |
873 | #ifdef COMPILE_UTILITY | |
874 | func = func; | |
875 | linenumber = linenumber; | |
876 | #else | |
877 | DEBUG(D_memory) | |
878 | debug_printf("---Unmap %6p %-20s %4d\n", block, func, linenumber); | |
879 | #endif | |
880 | munmap((void *)block, block->length + ALIGNED_SIZEOF_STOREBLOCK); | |
f3ebb786 JH |
881 | } |
882 | ||
883 | /******************************************************************************/ | |
884 | /* Stats output on process exit */ | |
885 | void | |
886 | store_exit(void) | |
887 | { | |
888 | #ifndef COMPILE_UTILITY | |
889 | DEBUG(D_memory) | |
890 | { | |
891 | debug_printf("----Exit nonpool max: %3d kB in %d blocks\n", | |
892 | (max_nonpool_malloc+1023)/1024, max_nonpool_blocks); | |
893 | debug_printf("----Exit npools max: %3d kB\n", max_pool_malloc/1024); | |
894 | for (int i = 0; i < NPOOLS; i++) | |
895 | debug_printf("----Exit pool %d max: %3d kB in %d blocks\t%s %s\n", | |
896 | i, maxbytes[i]/1024, maxblocks[i], poolclass[i], pooluse[i]); | |
897 | } | |
898 | #endif | |
899 | } | |
900 | ||
059ec3d9 | 901 | /* End of store.c */ |