Commit | Line | Data |
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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 | ||
138 | static const uschar * pooluse[NPOOLS] = { | |
139 | [POOL_MAIN] = US"main", | |
140 | [POOL_PERM] = US"perm", | |
141 | [POOL_SEARCH] = US"search", | |
142 | [POOL_TAINT_MAIN] = US"main", | |
143 | [POOL_TAINT_PERM] = US"perm", | |
144 | [POOL_TAINT_SEARCH] = US"search", | |
145 | }; | |
146 | static const uschar * poolclass[NPOOLS] = { | |
147 | [POOL_MAIN] = US"untainted", | |
148 | [POOL_PERM] = US"untainted", | |
149 | [POOL_SEARCH] = US"untainted", | |
150 | [POOL_TAINT_MAIN] = US"tainted", | |
151 | [POOL_TAINT_PERM] = US"tainted", | |
152 | [POOL_TAINT_SEARCH] = US"tainted", | |
153 | }; | |
154 | ||
155 | ||
156 | static void * store_mmap(int, const char *, int); | |
157 | static void * internal_store_malloc(int, const char *, int); | |
158 | static void internal_store_free(void *, const char *, int linenumber); | |
159 | ||
160 | /******************************************************************************/ | |
161 | ||
f3ebb786 JH |
162 | void |
163 | die_tainted(const uschar * msg, const uschar * func, int line) | |
164 | { | |
165 | log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Taint mismatch, %s: %s %d\n", | |
166 | msg, func, line); | |
167 | } | |
059ec3d9 PH |
168 | |
169 | ||
170 | /************************************************* | |
171 | * Get a block from the current pool * | |
172 | *************************************************/ | |
173 | ||
174 | /* Running out of store is a total disaster. This function is called via the | |
175 | macro store_get(). It passes back a block of store within the current big | |
176 | block, getting a new one if necessary. The address is saved in | |
177 | store_last_was_get. | |
178 | ||
179 | Arguments: | |
180 | size amount wanted | |
f3ebb786 JH |
181 | func function from which called |
182 | linenumber line number in source file | |
059ec3d9 PH |
183 | |
184 | Returns: pointer to store (panic on malloc failure) | |
185 | */ | |
186 | ||
187 | void * | |
f3ebb786 | 188 | store_get_3(int size, BOOL tainted, const char *func, int linenumber) |
059ec3d9 | 189 | { |
f3ebb786 JH |
190 | int pool = tainted ? store_pool + POOL_TAINT_BASE : store_pool; |
191 | ||
059ec3d9 PH |
192 | /* Round up the size to a multiple of the alignment. Although this looks a |
193 | messy statement, because "alignment" is a constant expression, the compiler can | |
194 | do a reasonable job of optimizing, especially if the value of "alignment" is a | |
195 | power of two. I checked this with -O2, and gcc did very well, compiling it to 4 | |
196 | instructions on a Sparc (alignment = 8). */ | |
197 | ||
198 | if (size % alignment != 0) size += alignment - (size % alignment); | |
199 | ||
200 | /* If there isn't room in the current block, get a new one. The minimum | |
201 | size is STORE_BLOCK_SIZE, and we would expect this to be the norm, since | |
202 | these functions are mostly called for small amounts of store. */ | |
203 | ||
f3ebb786 | 204 | if (size > yield_length[pool]) |
059ec3d9 | 205 | { |
f3ebb786 | 206 | int length = size <= STORE_BLOCK_SIZE ? STORE_BLOCK_SIZE : size; |
059ec3d9 | 207 | int mlength = length + ALIGNED_SIZEOF_STOREBLOCK; |
f3ebb786 | 208 | storeblock * newblock; |
059ec3d9 PH |
209 | |
210 | /* Sometimes store_reset() may leave a block for us; check if we can use it */ | |
211 | ||
f3ebb786 | 212 | if ( (newblock = current_block[pool]) |
64073d9c JH |
213 | && (newblock = newblock->next) |
214 | && newblock->length < length | |
215 | ) | |
059ec3d9 | 216 | { |
64073d9c | 217 | /* Give up on this block, because it's too small */ |
f3ebb786 JH |
218 | nblocks[pool]--; |
219 | if (pool < POOL_TAINT_BASE) | |
220 | internal_store_free(newblock, func, linenumber); | |
221 | else | |
222 | { | |
223 | #ifndef COMPILE_UTILITY | |
224 | DEBUG(D_memory) | |
225 | debug_printf("---Unmap %6p %-20s %4d\n", newblock, func, linenumber); | |
226 | #endif | |
227 | munmap(newblock, newblock->length + ALIGNED_SIZEOF_STOREBLOCK); | |
228 | } | |
64073d9c | 229 | newblock = NULL; |
059ec3d9 PH |
230 | } |
231 | ||
232 | /* If there was no free block, get a new one */ | |
233 | ||
64073d9c | 234 | if (!newblock) |
059ec3d9 | 235 | { |
f3ebb786 JH |
236 | if ((nbytes[pool] += mlength) > maxbytes[pool]) |
237 | maxbytes[pool] = nbytes[pool]; | |
238 | if ((pool_malloc += mlength) > max_pool_malloc) /* Used in pools */ | |
239 | max_pool_malloc = pool_malloc; | |
240 | nonpool_malloc -= mlength; /* Exclude from overall total */ | |
241 | if (++nblocks[pool] > maxblocks[pool]) | |
242 | maxblocks[pool] = nblocks[pool]; | |
243 | ||
244 | newblock = tainted | |
245 | ? store_mmap(mlength, func, linenumber) | |
246 | : internal_store_malloc(mlength, func, linenumber); | |
059ec3d9 PH |
247 | newblock->next = NULL; |
248 | newblock->length = length; | |
f3ebb786 JH |
249 | |
250 | if (!chainbase[pool]) | |
251 | chainbase[pool] = newblock; | |
64073d9c | 252 | else |
f3ebb786 | 253 | current_block[pool]->next = newblock; |
059ec3d9 PH |
254 | } |
255 | ||
f3ebb786 JH |
256 | current_block[pool] = newblock; |
257 | yield_length[pool] = newblock->length; | |
258 | next_yield[pool] = | |
259 | (void *)(CS current_block[pool] + ALIGNED_SIZEOF_STOREBLOCK); | |
260 | (void) VALGRIND_MAKE_MEM_NOACCESS(next_yield[pool], yield_length[pool]); | |
059ec3d9 PH |
261 | } |
262 | ||
263 | /* There's (now) enough room in the current block; the yield is the next | |
264 | pointer. */ | |
265 | ||
f3ebb786 | 266 | store_last_get[pool] = next_yield[pool]; |
059ec3d9 PH |
267 | |
268 | /* Cut out the debugging stuff for utilities, but stop picky compilers from | |
269 | giving warnings. */ | |
270 | ||
271 | #ifdef COMPILE_UTILITY | |
f3ebb786 | 272 | func = func; |
059ec3d9 PH |
273 | linenumber = linenumber; |
274 | #else | |
275 | DEBUG(D_memory) | |
f3ebb786 JH |
276 | debug_printf("---%d Get %6p %5d %-14s %4d\n", pool, |
277 | store_last_get[pool], size, func, linenumber); | |
059ec3d9 PH |
278 | #endif /* COMPILE_UTILITY */ |
279 | ||
f3ebb786 | 280 | (void) VALGRIND_MAKE_MEM_UNDEFINED(store_last_get[pool], size); |
059ec3d9 PH |
281 | /* Update next pointer and number of bytes left in the current block. */ |
282 | ||
f3ebb786 JH |
283 | next_yield[pool] = (void *)(CS next_yield[pool] + size); |
284 | yield_length[pool] -= size; | |
285 | return store_last_get[pool]; | |
059ec3d9 PH |
286 | } |
287 | ||
288 | ||
289 | ||
290 | /************************************************* | |
291 | * Get a block from the PERM pool * | |
292 | *************************************************/ | |
293 | ||
294 | /* This is just a convenience function, useful when just a single block is to | |
295 | be obtained. | |
296 | ||
297 | Arguments: | |
298 | size amount wanted | |
f3ebb786 JH |
299 | func function from which called |
300 | linenumber line number in source file | |
059ec3d9 PH |
301 | |
302 | Returns: pointer to store (panic on malloc failure) | |
303 | */ | |
304 | ||
305 | void * | |
f3ebb786 | 306 | store_get_perm_3(int size, BOOL tainted, const char *func, int linenumber) |
059ec3d9 PH |
307 | { |
308 | void *yield; | |
309 | int old_pool = store_pool; | |
310 | store_pool = POOL_PERM; | |
f3ebb786 | 311 | yield = store_get_3(size, tainted, func, linenumber); |
059ec3d9 PH |
312 | store_pool = old_pool; |
313 | return yield; | |
314 | } | |
315 | ||
316 | ||
317 | ||
318 | /************************************************* | |
319 | * Extend a block if it is at the top * | |
320 | *************************************************/ | |
321 | ||
322 | /* While reading strings of unknown length, it is often the case that the | |
323 | string is being read into the block at the top of the stack. If it needs to be | |
f3ebb786 | 324 | extended, it is more efficient just to extend within the top block rather than |
059ec3d9 PH |
325 | allocate a new block and then have to copy the data. This function is provided |
326 | for the use of string_cat(), but of course can be used elsewhere too. | |
f3ebb786 | 327 | The block itself is not expanded; only the top allocation from it. |
059ec3d9 PH |
328 | |
329 | Arguments: | |
330 | ptr pointer to store block | |
331 | oldsize current size of the block, as requested by user | |
332 | newsize new size required | |
f3ebb786 | 333 | func function from which called |
059ec3d9 PH |
334 | linenumber line number in source file |
335 | ||
336 | Returns: TRUE if the block is at the top of the stack and has been | |
337 | extended; FALSE if it isn't at the top of the stack, or cannot | |
338 | be extended | |
339 | */ | |
340 | ||
341 | BOOL | |
f3ebb786 JH |
342 | store_extend_3(void *ptr, BOOL tainted, int oldsize, int newsize, |
343 | const char *func, int linenumber) | |
059ec3d9 | 344 | { |
f3ebb786 | 345 | int pool = tainted ? store_pool + POOL_TAINT_BASE : store_pool; |
059ec3d9 PH |
346 | int inc = newsize - oldsize; |
347 | int rounded_oldsize = oldsize; | |
348 | ||
f3ebb786 JH |
349 | /* Check that the block being extended was already of the required taint status; |
350 | refuse to extend if not. */ | |
351 | ||
352 | if (is_tainted(ptr) != tainted) | |
353 | return FALSE; | |
354 | ||
059ec3d9 PH |
355 | if (rounded_oldsize % alignment != 0) |
356 | rounded_oldsize += alignment - (rounded_oldsize % alignment); | |
357 | ||
f3ebb786 JH |
358 | if (CS ptr + rounded_oldsize != CS (next_yield[pool]) || |
359 | inc > yield_length[pool] + rounded_oldsize - oldsize) | |
059ec3d9 PH |
360 | return FALSE; |
361 | ||
362 | /* Cut out the debugging stuff for utilities, but stop picky compilers from | |
363 | giving warnings. */ | |
364 | ||
365 | #ifdef COMPILE_UTILITY | |
f3ebb786 | 366 | func = func; |
059ec3d9 PH |
367 | linenumber = linenumber; |
368 | #else | |
369 | DEBUG(D_memory) | |
f3ebb786 JH |
370 | debug_printf("---%d Ext %6p %5d %-14s %4d\n", pool, ptr, newsize, |
371 | func, linenumber); | |
059ec3d9 PH |
372 | #endif /* COMPILE_UTILITY */ |
373 | ||
374 | if (newsize % alignment != 0) newsize += alignment - (newsize % alignment); | |
f3ebb786 JH |
375 | next_yield[pool] = CS ptr + newsize; |
376 | yield_length[pool] -= newsize - rounded_oldsize; | |
4d8bb202 | 377 | (void) VALGRIND_MAKE_MEM_UNDEFINED(ptr + oldsize, inc); |
059ec3d9 PH |
378 | return TRUE; |
379 | } | |
380 | ||
381 | ||
382 | ||
383 | ||
384 | /************************************************* | |
385 | * Back up to a previous point on the stack * | |
386 | *************************************************/ | |
387 | ||
388 | /* This function resets the next pointer, freeing any subsequent whole blocks | |
f3ebb786 JH |
389 | that are now unused. Call with a cookie obtained from store_mark() only; do |
390 | not call with a pointer returned by store_get(). Both the untainted and tainted | |
391 | pools corresposding to store_pool are reset. | |
059ec3d9 PH |
392 | |
393 | Arguments: | |
f3ebb786 JH |
394 | r place to back up to |
395 | func function from which called | |
059ec3d9 PH |
396 | linenumber line number in source file |
397 | ||
398 | Returns: nothing | |
399 | */ | |
400 | ||
f3ebb786 JH |
401 | static void |
402 | internal_store_reset(void * ptr, int pool, const char *func, int linenumber) | |
059ec3d9 | 403 | { |
cf0812d5 | 404 | storeblock * bb; |
f3ebb786 | 405 | storeblock * b = current_block[pool]; |
cf0812d5 | 406 | char * bc = CS b + ALIGNED_SIZEOF_STOREBLOCK; |
f3ebb786 JH |
407 | int newlength, count; |
408 | #ifndef COMPILE_UTILITY | |
409 | int oldmalloc = pool_malloc; | |
410 | #endif | |
059ec3d9 PH |
411 | |
412 | /* Last store operation was not a get */ | |
413 | ||
f3ebb786 | 414 | store_last_get[pool] = NULL; |
059ec3d9 PH |
415 | |
416 | /* See if the place is in the current block - as it often will be. Otherwise, | |
417 | search for the block in which it lies. */ | |
418 | ||
cf0812d5 | 419 | if (CS ptr < bc || CS ptr > bc + b->length) |
059ec3d9 | 420 | { |
f3ebb786 | 421 | for (b = chainbase[pool]; b; b = b->next) |
059ec3d9 | 422 | { |
cf0812d5 JH |
423 | bc = CS b + ALIGNED_SIZEOF_STOREBLOCK; |
424 | if (CS ptr >= bc && CS ptr <= bc + b->length) break; | |
059ec3d9 | 425 | } |
cf0812d5 | 426 | if (!b) |
438257ba | 427 | log_write(0, LOG_MAIN|LOG_PANIC_DIE, "internal error: store_reset(%p) " |
f3ebb786 | 428 | "failed: pool=%d %-14s %4d", ptr, pool, func, linenumber); |
059ec3d9 PH |
429 | } |
430 | ||
431 | /* Back up, rounding to the alignment if necessary. When testing, flatten | |
432 | the released memory. */ | |
433 | ||
cf0812d5 | 434 | newlength = bc + b->length - CS ptr; |
059ec3d9 | 435 | #ifndef COMPILE_UTILITY |
65a32f85 | 436 | if (debug_store) |
2c9f7ff8 | 437 | { |
f3ebb786 | 438 | assert_no_variables(ptr, newlength, func, linenumber); |
8768d548 | 439 | if (f.running_in_test_harness) |
64073d9c JH |
440 | { |
441 | (void) VALGRIND_MAKE_MEM_DEFINED(ptr, newlength); | |
442 | memset(ptr, 0xF0, newlength); | |
443 | } | |
2c9f7ff8 | 444 | } |
059ec3d9 | 445 | #endif |
4d8bb202 | 446 | (void) VALGRIND_MAKE_MEM_NOACCESS(ptr, newlength); |
f3ebb786 JH |
447 | next_yield[pool] = CS ptr + (newlength % alignment); |
448 | count = yield_length[pool]; | |
449 | count = (yield_length[pool] = newlength - (newlength % alignment)) - count; | |
450 | current_block[pool] = b; | |
451 | ||
452 | /* Free any subsequent block. Do NOT free the first | |
453 | successor, if our current block has less than 256 bytes left. This should | |
454 | prevent us from flapping memory. However, keep this block only when it has | |
455 | the default size. */ | |
456 | ||
457 | if ( yield_length[pool] < STOREPOOL_MIN_SIZE | |
458 | && b->next | |
459 | && b->next->length == STORE_BLOCK_SIZE) | |
7f36d675 | 460 | { |
059ec3d9 | 461 | b = b->next; |
cf0812d5 | 462 | #ifndef COMPILE_UTILITY |
65a32f85 | 463 | if (debug_store) |
cf0812d5 | 464 | assert_no_variables(b, b->length + ALIGNED_SIZEOF_STOREBLOCK, |
f3ebb786 | 465 | func, linenumber); |
cf0812d5 JH |
466 | #endif |
467 | (void) VALGRIND_MAKE_MEM_NOACCESS(CS b + ALIGNED_SIZEOF_STOREBLOCK, | |
4d8bb202 | 468 | b->length - ALIGNED_SIZEOF_STOREBLOCK); |
7f36d675 | 469 | } |
059ec3d9 PH |
470 | |
471 | bb = b->next; | |
472 | b->next = NULL; | |
473 | ||
cf0812d5 | 474 | while ((b = bb)) |
059ec3d9 | 475 | { |
f3ebb786 | 476 | int siz = b->length + ALIGNED_SIZEOF_STOREBLOCK; |
cf0812d5 | 477 | #ifndef COMPILE_UTILITY |
65a32f85 | 478 | if (debug_store) |
cf0812d5 | 479 | assert_no_variables(b, b->length + ALIGNED_SIZEOF_STOREBLOCK, |
f3ebb786 | 480 | func, linenumber); |
cf0812d5 | 481 | #endif |
059ec3d9 | 482 | bb = bb->next; |
f3ebb786 JH |
483 | nbytes[pool] -= siz; |
484 | pool_malloc -= siz; | |
485 | nblocks[pool]--; | |
486 | if (pool < POOL_TAINT_BASE) | |
487 | internal_store_free(b, func, linenumber); | |
488 | else | |
489 | { | |
490 | #ifndef COMPILE_UTILITY | |
491 | DEBUG(D_memory) | |
492 | debug_printf("---Unmap %6p %-20s %4d\n", b, func, linenumber); | |
493 | #endif | |
494 | munmap(b, b->length + ALIGNED_SIZEOF_STOREBLOCK); | |
495 | } | |
059ec3d9 PH |
496 | } |
497 | ||
498 | /* Cut out the debugging stuff for utilities, but stop picky compilers from | |
499 | giving warnings. */ | |
500 | ||
501 | #ifdef COMPILE_UTILITY | |
f3ebb786 | 502 | func = func; |
059ec3d9 PH |
503 | linenumber = linenumber; |
504 | #else | |
505 | DEBUG(D_memory) | |
f3ebb786 JH |
506 | debug_printf("---%d Rst %6p %5d %-14s %4d %d\n", pool, ptr, |
507 | count + oldmalloc - pool_malloc, | |
508 | func, linenumber, pool_malloc); | |
509 | #endif /* COMPILE_UTILITY */ | |
510 | } | |
511 | ||
512 | ||
513 | rmark | |
514 | store_reset_3(rmark r, int pool, const char *func, int linenumber) | |
515 | { | |
516 | void ** ptr = r; | |
517 | ||
518 | if (pool >= POOL_TAINT_BASE) | |
519 | log_write(0, LOG_MAIN|LOG_PANIC_DIE, | |
520 | "store_reset called for pool %d: %s %d\n", pool, func, linenumber); | |
521 | if (!r) | |
522 | log_write(0, LOG_MAIN|LOG_PANIC_DIE, | |
523 | "store_reset called with bad mark: %s %d\n", func, linenumber); | |
524 | ||
525 | internal_store_reset(*ptr, pool + POOL_TAINT_BASE, func, linenumber); | |
526 | internal_store_reset(ptr, pool, func, linenumber); | |
527 | return NULL; | |
528 | } | |
529 | ||
530 | ||
531 | ||
532 | /* Free tail-end unused allocation. This lets us allocate a big chunk | |
533 | early, for cases when we only discover later how much was really needed. | |
534 | ||
535 | Can be called with a value from store_get(), or an offset after such. Only | |
536 | the tainted or untainted pool that serviced the store_get() will be affected. | |
537 | ||
538 | This is mostly a cut-down version of internal_store_reset(). | |
539 | XXX needs rationalising | |
540 | */ | |
541 | ||
542 | void | |
543 | store_release_above_3(void *ptr, const char *func, int linenumber) | |
544 | { | |
545 | /* Search all pools' "current" blocks. If it isn't one of those, | |
546 | ignore it (it usually will be). */ | |
547 | ||
548 | for (int pool = 0; pool < nelem(current_block); pool++) | |
059ec3d9 | 549 | { |
f3ebb786 JH |
550 | storeblock * b = current_block[pool]; |
551 | char * bc; | |
552 | int count, newlength; | |
553 | ||
554 | if (!b) | |
555 | continue; | |
556 | ||
557 | bc = CS b + ALIGNED_SIZEOF_STOREBLOCK; | |
558 | if (CS ptr < bc || CS ptr > bc + b->length) | |
559 | continue; | |
560 | ||
561 | /* Last store operation was not a get */ | |
562 | ||
563 | store_last_get[pool] = NULL; | |
564 | ||
565 | /* Back up, rounding to the alignment if necessary. When testing, flatten | |
566 | the released memory. */ | |
567 | ||
568 | newlength = bc + b->length - CS ptr; | |
569 | #ifndef COMPILE_UTILITY | |
570 | if (debug_store) | |
571 | { | |
572 | assert_no_variables(ptr, newlength, func, linenumber); | |
573 | if (f.running_in_test_harness) | |
574 | { | |
575 | (void) VALGRIND_MAKE_MEM_DEFINED(ptr, newlength); | |
576 | memset(ptr, 0xF0, newlength); | |
577 | } | |
578 | } | |
579 | #endif | |
580 | (void) VALGRIND_MAKE_MEM_NOACCESS(ptr, newlength); | |
581 | next_yield[pool] = CS ptr + (newlength % alignment); | |
582 | count = yield_length[pool]; | |
583 | count = (yield_length[pool] = newlength - (newlength % alignment)) - count; | |
584 | ||
585 | /* Cut out the debugging stuff for utilities, but stop picky compilers from | |
586 | giving warnings. */ | |
587 | ||
588 | #ifdef COMPILE_UTILITY | |
589 | func = func; | |
590 | linenumber = linenumber; | |
591 | #else | |
592 | DEBUG(D_memory) | |
593 | debug_printf("---%d Rel %6p %5d %-14s %4d %d\n", pool, ptr, count, | |
594 | func, linenumber, pool_malloc); | |
595 | #endif | |
596 | return; | |
059ec3d9 | 597 | } |
f3ebb786 JH |
598 | #ifndef COMPILE_UTILITY |
599 | DEBUG(D_memory) | |
600 | debug_printf("non-last memory release try: %s %d\n", func, linenumber); | |
601 | #endif | |
059ec3d9 PH |
602 | } |
603 | ||
604 | ||
605 | ||
f3ebb786 JH |
606 | rmark |
607 | store_mark_3(const char *func, int linenumber) | |
608 | { | |
609 | void ** p; | |
610 | ||
611 | if (store_pool >= POOL_TAINT_BASE) | |
612 | log_write(0, LOG_MAIN|LOG_PANIC_DIE, | |
613 | "store_mark called for pool %d: %s %d\n", store_pool, func, linenumber); | |
614 | ||
615 | /* Stash a mark for the tainted-twin release, in the untainted twin. Return | |
616 | a cookie (actually the address in the untainted pool) to the caller. | |
617 | Reset uses the cookie to recover the t-mark, winds back the tainted pool with it | |
618 | and winds back the untainted pool with the cookie. */ | |
619 | ||
620 | p = store_get_3(sizeof(void *), FALSE, func, linenumber); | |
621 | *p = store_get_3(0, TRUE, func, linenumber); | |
622 | return p; | |
623 | } | |
624 | ||
625 | ||
059ec3d9 PH |
626 | |
627 | ||
628 | /************************************************ | |
629 | * Release store * | |
630 | ************************************************/ | |
631 | ||
459fca58 JH |
632 | /* This function checks that the pointer it is given is the first thing in a |
633 | block, and if so, releases that block. | |
059ec3d9 PH |
634 | |
635 | Arguments: | |
636 | block block of store to consider | |
f3ebb786 | 637 | func function from which called |
059ec3d9 PH |
638 | linenumber line number in source file |
639 | ||
640 | Returns: nothing | |
641 | */ | |
642 | ||
459fca58 | 643 | static void |
f3ebb786 | 644 | store_release_3(void * block, int pool, const char * func, int linenumber) |
059ec3d9 | 645 | { |
059ec3d9 PH |
646 | /* It will never be the first block, so no need to check that. */ |
647 | ||
f3ebb786 | 648 | for (storeblock * b = chainbase[pool]; b; b = b->next) |
059ec3d9 | 649 | { |
459fca58 JH |
650 | storeblock * bb = b->next; |
651 | if (bb && CS block == CS bb + ALIGNED_SIZEOF_STOREBLOCK) | |
059ec3d9 | 652 | { |
f3ebb786 | 653 | int siz = bb->length + ALIGNED_SIZEOF_STOREBLOCK; |
059ec3d9 | 654 | b->next = bb->next; |
f3ebb786 JH |
655 | nbytes[pool] -= siz; |
656 | pool_malloc -= siz; | |
657 | nblocks[pool]--; | |
059ec3d9 PH |
658 | |
659 | /* Cut out the debugging stuff for utilities, but stop picky compilers | |
660 | from giving warnings. */ | |
661 | ||
459fca58 | 662 | #ifdef COMPILE_UTILITY |
f3ebb786 | 663 | func = func; |
059ec3d9 | 664 | linenumber = linenumber; |
459fca58 | 665 | #else |
059ec3d9 | 666 | DEBUG(D_memory) |
f3ebb786 JH |
667 | debug_printf("-Release %6p %-20s %4d %d\n", (void *)bb, func, |
668 | linenumber, pool_malloc); | |
459fca58 | 669 | |
8768d548 | 670 | if (f.running_in_test_harness) |
059ec3d9 | 671 | memset(bb, 0xF0, bb->length+ALIGNED_SIZEOF_STOREBLOCK); |
459fca58 | 672 | #endif /* COMPILE_UTILITY */ |
059ec3d9 PH |
673 | |
674 | free(bb); | |
675 | return; | |
676 | } | |
677 | } | |
678 | } | |
679 | ||
680 | ||
459fca58 JH |
681 | /************************************************ |
682 | * Move store * | |
683 | ************************************************/ | |
684 | ||
685 | /* Allocate a new block big enough to expend to the given size and | |
686 | copy the current data into it. Free the old one if possible. | |
687 | ||
688 | This function is specifically provided for use when reading very | |
689 | long strings, e.g. header lines. When the string gets longer than a | |
690 | complete block, it gets copied to a new block. It is helpful to free | |
691 | the old block iff the previous copy of the string is at its start, | |
692 | and therefore the only thing in it. Otherwise, for very long strings, | |
693 | dead store can pile up somewhat disastrously. This function checks that | |
694 | the pointer it is given is the first thing in a block, and that nothing | |
695 | has been allocated since. If so, releases that block. | |
696 | ||
697 | Arguments: | |
698 | block | |
699 | newsize | |
700 | len | |
701 | ||
702 | Returns: new location of data | |
703 | */ | |
704 | ||
705 | void * | |
f3ebb786 JH |
706 | store_newblock_3(void * block, BOOL tainted, int newsize, int len, |
707 | const char * func, int linenumber) | |
459fca58 | 708 | { |
f3ebb786 JH |
709 | int pool = tainted ? store_pool + POOL_TAINT_BASE : store_pool; |
710 | BOOL release_ok = !tainted && store_last_get[pool] == block; | |
711 | uschar * newtext; | |
712 | ||
713 | if (is_tainted(block) != tainted) | |
714 | die_tainted(US"store_newblock", CUS func, linenumber); | |
459fca58 | 715 | |
f3ebb786 | 716 | newtext = store_get(newsize, tainted); |
459fca58 | 717 | memcpy(newtext, block, len); |
f3ebb786 | 718 | if (release_ok) store_release_3(block, pool, func, linenumber); |
459fca58 JH |
719 | return (void *)newtext; |
720 | } | |
721 | ||
722 | ||
059ec3d9 PH |
723 | |
724 | ||
f3ebb786 JH |
725 | /******************************************************************************/ |
726 | static void * | |
727 | store_alloc_tail(void * yield, int size, const char * func, int line, | |
728 | const uschar * type) | |
729 | { | |
730 | if ((nonpool_malloc += size) > max_nonpool_malloc) | |
731 | max_nonpool_malloc = nonpool_malloc; | |
732 | ||
733 | /* Cut out the debugging stuff for utilities, but stop picky compilers from | |
734 | giving warnings. */ | |
735 | ||
736 | #ifdef COMPILE_UTILITY | |
737 | func = func; line = line; type = type; | |
738 | #else | |
739 | ||
740 | /* If running in test harness, spend time making sure all the new store | |
741 | is not filled with zeros so as to catch problems. */ | |
742 | ||
743 | if (f.running_in_test_harness) | |
744 | memset(yield, 0xF0, (size_t)size); | |
745 | DEBUG(D_memory) debug_printf("--%6s %6p %5d bytes\t%-14s %4d\tpool %5d nonpool %5d\n", | |
746 | type, yield, size, func, line, pool_malloc, nonpool_malloc); | |
747 | #endif /* COMPILE_UTILITY */ | |
748 | ||
749 | return yield; | |
750 | } | |
751 | ||
752 | /************************************************* | |
753 | * Mmap store * | |
754 | *************************************************/ | |
755 | ||
756 | static void * | |
757 | store_mmap(int size, const char * func, int line) | |
758 | { | |
759 | void * yield, * top; | |
760 | ||
761 | if (size < 16) size = 16; | |
762 | ||
763 | if (!(yield = mmap(NULL, (size_t)size, | |
764 | PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0))) | |
765 | log_write(0, LOG_MAIN|LOG_PANIC_DIE, "failed to mmap %d bytes of memory: " | |
766 | "called from line %d of %s", size, line, func); | |
767 | ||
768 | if (yield < tainted_base) tainted_base = yield; | |
769 | if ((top = yield + size) > tainted_top) tainted_top = top; | |
770 | ||
771 | return store_alloc_tail(yield, size, func, line, US"Mmap"); | |
772 | } | |
773 | ||
059ec3d9 PH |
774 | /************************************************* |
775 | * Malloc store * | |
776 | *************************************************/ | |
777 | ||
778 | /* Running out of store is a total disaster for exim. Some malloc functions | |
779 | do not run happily on very small sizes, nor do they document this fact. This | |
780 | function is called via the macro store_malloc(). | |
781 | ||
782 | Arguments: | |
783 | size amount of store wanted | |
f3ebb786 | 784 | func function from which called |
059ec3d9 PH |
785 | linenumber line number in source file |
786 | ||
787 | Returns: pointer to gotten store (panic on failure) | |
788 | */ | |
789 | ||
f3ebb786 JH |
790 | static void * |
791 | internal_store_malloc(int size, const char *func, int linenumber) | |
059ec3d9 | 792 | { |
f3ebb786 | 793 | void * yield; |
059ec3d9 PH |
794 | |
795 | if (size < 16) size = 16; | |
059ec3d9 | 796 | |
40c90bca | 797 | if (!(yield = malloc((size_t)size))) |
059ec3d9 | 798 | log_write(0, LOG_MAIN|LOG_PANIC_DIE, "failed to malloc %d bytes of memory: " |
f3ebb786 | 799 | "called from line %d in %s", size, linenumber, func); |
059ec3d9 | 800 | |
f3ebb786 JH |
801 | return store_alloc_tail(yield, size, func, linenumber, US"Malloc"); |
802 | } | |
059ec3d9 | 803 | |
f3ebb786 JH |
804 | void * |
805 | store_malloc_3(int size, const char *func, int linenumber) | |
806 | { | |
807 | if (n_nonpool_blocks++ > max_nonpool_blocks) | |
808 | max_nonpool_blocks = n_nonpool_blocks; | |
809 | return internal_store_malloc(size, func, linenumber); | |
059ec3d9 PH |
810 | } |
811 | ||
812 | ||
813 | /************************************************ | |
814 | * Free store * | |
815 | ************************************************/ | |
816 | ||
817 | /* This function is called by the macro store_free(). | |
818 | ||
819 | Arguments: | |
820 | block block of store to free | |
f3ebb786 | 821 | func function from which called |
059ec3d9 PH |
822 | linenumber line number in source file |
823 | ||
824 | Returns: nothing | |
825 | */ | |
826 | ||
f3ebb786 JH |
827 | static void |
828 | internal_store_free(void *block, const char *func, int linenumber) | |
059ec3d9 PH |
829 | { |
830 | #ifdef COMPILE_UTILITY | |
f3ebb786 | 831 | func = func; |
059ec3d9 PH |
832 | linenumber = linenumber; |
833 | #else | |
834 | DEBUG(D_memory) | |
f3ebb786 | 835 | debug_printf("----Free %6p %-20s %4d\n", block, func, linenumber); |
059ec3d9 PH |
836 | #endif /* COMPILE_UTILITY */ |
837 | free(block); | |
838 | } | |
839 | ||
f3ebb786 JH |
840 | void |
841 | store_free_3(void *block, const char *func, int linenumber) | |
842 | { | |
843 | n_nonpool_blocks--; | |
844 | internal_store_free(block, func, linenumber); | |
845 | } | |
846 | ||
847 | /******************************************************************************/ | |
848 | /* Stats output on process exit */ | |
849 | void | |
850 | store_exit(void) | |
851 | { | |
852 | #ifndef COMPILE_UTILITY | |
853 | DEBUG(D_memory) | |
854 | { | |
855 | debug_printf("----Exit nonpool max: %3d kB in %d blocks\n", | |
856 | (max_nonpool_malloc+1023)/1024, max_nonpool_blocks); | |
857 | debug_printf("----Exit npools max: %3d kB\n", max_pool_malloc/1024); | |
858 | for (int i = 0; i < NPOOLS; i++) | |
859 | debug_printf("----Exit pool %d max: %3d kB in %d blocks\t%s %s\n", | |
860 | i, maxbytes[i]/1024, maxblocks[i], poolclass[i], pooluse[i]); | |
861 | } | |
862 | #endif | |
863 | } | |
864 | ||
059ec3d9 | 865 | /* End of store.c */ |