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Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001/*
2 * Copyright 2002 Niels Provos <provos@citi.umich.edu>
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
15 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
16 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
17 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
18 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
19 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
20 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
21 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
23 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
24 */
25
26#include "includes.h"
Darren Tucker1f8311c2004-05-13 16:39:33 +100027RCSID("$OpenBSD: monitor_mm.c,v 1.9 2004/05/11 19:01:43 deraadt Exp $");
Ben Lindstrom7a2073c2002-03-22 02:30:41 +000028
Kevin Steves86b9fe62002-04-07 17:08:53 +000029#ifdef HAVE_SYS_MMAN_H
Ben Lindstrom7a2073c2002-03-22 02:30:41 +000030#include <sys/mman.h>
Kevin Steves86b9fe62002-04-07 17:08:53 +000031#endif
Ben Lindstrom7a2073c2002-03-22 02:30:41 +000032
33#include "ssh.h"
34#include "xmalloc.h"
35#include "log.h"
36#include "monitor_mm.h"
37
38static int
39mm_compare(struct mm_share *a, struct mm_share *b)
40{
Ben Lindstroma7961622002-07-04 00:08:23 +000041 long diff = (char *)a->address - (char *)b->address;
42
43 if (diff == 0)
44 return (0);
45 else if (diff < 0)
46 return (-1);
47 else
48 return (1);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +000049}
50
51RB_GENERATE(mmtree, mm_share, next, mm_compare)
52
53static struct mm_share *
54mm_make_entry(struct mm_master *mm, struct mmtree *head,
55 void *address, size_t size)
56{
57 struct mm_share *tmp, *tmp2;
58
59 if (mm->mmalloc == NULL)
60 tmp = xmalloc(sizeof(struct mm_share));
61 else
62 tmp = mm_xmalloc(mm->mmalloc, sizeof(struct mm_share));
63 tmp->address = address;
64 tmp->size = size;
65
66 tmp2 = RB_INSERT(mmtree, head, tmp);
67 if (tmp2 != NULL)
Ben Lindstromc8615472002-03-26 03:20:45 +000068 fatal("mm_make_entry(%p): double address %p->%p(%lu)",
69 mm, tmp2, address, (u_long)size);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +000070
71 return (tmp);
72}
73
74/* Creates a shared memory area of a certain size */
75
76struct mm_master *
77mm_create(struct mm_master *mmalloc, size_t size)
78{
79 void *address;
80 struct mm_master *mm;
81
82 if (mmalloc == NULL)
83 mm = xmalloc(sizeof(struct mm_master));
84 else
85 mm = mm_xmalloc(mmalloc, sizeof(struct mm_master));
86
87 /*
88 * If the memory map has a mm_master it can be completely
89 * shared including authentication between the child
90 * and the client.
91 */
92 mm->mmalloc = mmalloc;
93
Tim Rice40017b02002-07-14 13:36:49 -070094 address = xmmap(size);
Darren Tuckerdbc22962004-10-06 23:15:44 +100095 if (address == (void *)MAP_FAILED)
Ben Lindstroma95fd3f2002-06-26 00:22:57 +000096 fatal("mmap(%lu): %s", (u_long)size, strerror(errno));
Ben Lindstrom7a2073c2002-03-22 02:30:41 +000097
98 mm->address = address;
99 mm->size = size;
100
101 RB_INIT(&mm->rb_free);
102 RB_INIT(&mm->rb_allocated);
103
104 mm_make_entry(mm, &mm->rb_free, address, size);
105
106 return (mm);
107}
108
109/* Frees either the allocated or the free list */
110
111static void
112mm_freelist(struct mm_master *mmalloc, struct mmtree *head)
113{
114 struct mm_share *mms, *next;
115
116 for (mms = RB_ROOT(head); mms; mms = next) {
117 next = RB_NEXT(mmtree, head, mms);
118 RB_REMOVE(mmtree, head, mms);
119 if (mmalloc == NULL)
120 xfree(mms);
121 else
122 mm_free(mmalloc, mms);
123 }
124}
125
126/* Destroys a memory mapped area */
127
128void
129mm_destroy(struct mm_master *mm)
130{
131 mm_freelist(mm->mmalloc, &mm->rb_free);
132 mm_freelist(mm->mmalloc, &mm->rb_allocated);
133
Tim Rice40017b02002-07-14 13:36:49 -0700134#ifdef HAVE_MMAP
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000135 if (munmap(mm->address, mm->size) == -1)
Ben Lindstrom4eeccc72002-06-07 01:57:25 +0000136 fatal("munmap(%p, %lu): %s", mm->address, (u_long)mm->size,
Ben Lindstrom105ccbe2002-06-06 20:33:06 +0000137 strerror(errno));
Kevin Steves265c9d02002-04-07 22:36:49 +0000138#else
Ben Lindstrom4e3c6312002-06-26 00:29:02 +0000139 fatal("%s: UsePrivilegeSeparation=yes and Compression=yes not supported",
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +0000140 __func__);
Kevin Steves265c9d02002-04-07 22:36:49 +0000141#endif
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000142 if (mm->mmalloc == NULL)
143 xfree(mm);
144 else
145 mm_free(mm->mmalloc, mm);
146}
147
148void *
149mm_xmalloc(struct mm_master *mm, size_t size)
150{
151 void *address;
152
153 address = mm_malloc(mm, size);
154 if (address == NULL)
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +0000155 fatal("%s: mm_malloc(%lu)", __func__, (u_long)size);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000156 return (address);
157}
158
159
160/* Allocates data from a memory mapped area */
161
162void *
163mm_malloc(struct mm_master *mm, size_t size)
164{
165 struct mm_share *mms, *tmp;
166
167 if (size == 0)
168 fatal("mm_malloc: try to allocate 0 space");
Ben Lindstrom0a4f7542002-08-20 18:36:25 +0000169 if (size > SIZE_T_MAX - MM_MINSIZE + 1)
170 fatal("mm_malloc: size too big");
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000171
Ben Lindstrom0a4f7542002-08-20 18:36:25 +0000172 size = ((size + (MM_MINSIZE - 1)) / MM_MINSIZE) * MM_MINSIZE;
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000173
174 RB_FOREACH(mms, mmtree, &mm->rb_free) {
175 if (mms->size >= size)
176 break;
177 }
178
179 if (mms == NULL)
180 return (NULL);
181
182 /* Debug */
183 memset(mms->address, 0xd0, size);
184
185 tmp = mm_make_entry(mm, &mm->rb_allocated, mms->address, size);
186
187 /* Does not change order in RB tree */
188 mms->size -= size;
189 mms->address = (u_char *)mms->address + size;
190
191 if (mms->size == 0) {
192 RB_REMOVE(mmtree, &mm->rb_free, mms);
193 if (mm->mmalloc == NULL)
194 xfree(mms);
195 else
196 mm_free(mm->mmalloc, mms);
197 }
198
199 return (tmp->address);
200}
201
202/* Frees memory in a memory mapped area */
203
204void
205mm_free(struct mm_master *mm, void *address)
206{
207 struct mm_share *mms, *prev, tmp;
208
209 tmp.address = address;
210 mms = RB_FIND(mmtree, &mm->rb_allocated, &tmp);
211 if (mms == NULL)
212 fatal("mm_free(%p): can not find %p", mm, address);
213
214 /* Debug */
215 memset(mms->address, 0xd0, mms->size);
216
217 /* Remove from allocated list and insert in free list */
218 RB_REMOVE(mmtree, &mm->rb_allocated, mms);
219 if (RB_INSERT(mmtree, &mm->rb_free, mms) != NULL)
220 fatal("mm_free(%p): double address %p", mm, address);
221
222 /* Find previous entry */
223 prev = mms;
224 if (RB_LEFT(prev, next)) {
225 prev = RB_LEFT(prev, next);
226 while (RB_RIGHT(prev, next))
227 prev = RB_RIGHT(prev, next);
228 } else {
229 if (RB_PARENT(prev, next) &&
230 (prev == RB_RIGHT(RB_PARENT(prev, next), next)))
231 prev = RB_PARENT(prev, next);
232 else {
233 while (RB_PARENT(prev, next) &&
234 (prev == RB_LEFT(RB_PARENT(prev, next), next)))
235 prev = RB_PARENT(prev, next);
236 prev = RB_PARENT(prev, next);
237 }
238 }
239
240 /* Check if range does not overlap */
241 if (prev != NULL && MM_ADDRESS_END(prev) > address)
Ben Lindstromc8615472002-03-26 03:20:45 +0000242 fatal("mm_free: memory corruption: %p(%lu) > %p",
243 prev->address, (u_long)prev->size, address);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000244
245 /* See if we can merge backwards */
246 if (prev != NULL && MM_ADDRESS_END(prev) == address) {
247 prev->size += mms->size;
248 RB_REMOVE(mmtree, &mm->rb_free, mms);
249 if (mm->mmalloc == NULL)
250 xfree(mms);
251 else
252 mm_free(mm->mmalloc, mms);
253 } else
254 prev = mms;
255
256 if (prev == NULL)
257 return;
258
259 /* Check if we can merge forwards */
260 mms = RB_NEXT(mmtree, &mm->rb_free, prev);
261 if (mms == NULL)
262 return;
263
264 if (MM_ADDRESS_END(prev) > mms->address)
Ben Lindstromc8615472002-03-26 03:20:45 +0000265 fatal("mm_free: memory corruption: %p < %p(%lu)",
266 mms->address, prev->address, (u_long)prev->size);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000267 if (MM_ADDRESS_END(prev) != mms->address)
268 return;
269
270 prev->size += mms->size;
271 RB_REMOVE(mmtree, &mm->rb_free, mms);
272
273 if (mm->mmalloc == NULL)
274 xfree(mms);
275 else
276 mm_free(mm->mmalloc, mms);
277}
278
279static void
280mm_sync_list(struct mmtree *oldtree, struct mmtree *newtree,
281 struct mm_master *mm, struct mm_master *mmold)
282{
283 struct mm_master *mmalloc = mm->mmalloc;
284 struct mm_share *mms, *new;
285
286 /* Sync free list */
287 RB_FOREACH(mms, mmtree, oldtree) {
288 /* Check the values */
289 mm_memvalid(mmold, mms, sizeof(struct mm_share));
290 mm_memvalid(mm, mms->address, mms->size);
291
292 new = mm_xmalloc(mmalloc, sizeof(struct mm_share));
293 memcpy(new, mms, sizeof(struct mm_share));
294 RB_INSERT(mmtree, newtree, new);
295 }
296}
297
298void
299mm_share_sync(struct mm_master **pmm, struct mm_master **pmmalloc)
300{
301 struct mm_master *mm;
302 struct mm_master *mmalloc;
303 struct mm_master *mmold;
304 struct mmtree rb_free, rb_allocated;
305
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +0000306 debug3("%s: Share sync", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000307
308 mm = *pmm;
309 mmold = mm->mmalloc;
310 mm_memvalid(mmold, mm, sizeof(*mm));
311
312 mmalloc = mm_create(NULL, mm->size);
313 mm = mm_xmalloc(mmalloc, sizeof(struct mm_master));
314 memcpy(mm, *pmm, sizeof(struct mm_master));
315 mm->mmalloc = mmalloc;
316
317 rb_free = mm->rb_free;
318 rb_allocated = mm->rb_allocated;
319
320 RB_INIT(&mm->rb_free);
321 RB_INIT(&mm->rb_allocated);
322
323 mm_sync_list(&rb_free, &mm->rb_free, mm, mmold);
324 mm_sync_list(&rb_allocated, &mm->rb_allocated, mm, mmold);
325
326 mm_destroy(mmold);
327
328 *pmm = mm;
329 *pmmalloc = mmalloc;
330
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +0000331 debug3("%s: Share sync end", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000332}
333
334void
335mm_memvalid(struct mm_master *mm, void *address, size_t size)
336{
337 void *end = (u_char *)address + size;
338
339 if (address < mm->address)
340 fatal("mm_memvalid: address too small: %p", address);
341 if (end < address)
342 fatal("mm_memvalid: end < address: %p < %p", end, address);
343 if (end > (void *)((u_char *)mm->address + mm->size))
344 fatal("mm_memvalid: address too large: %p", address);
345}