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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"
Ben Lindstromc8615472002-03-26 03:20:45 +000027RCSID("$OpenBSD: monitor_mm.c,v 1.4 2002/03/25 20:12:10 stevesk 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{
41 return ((char *)a->address - (char *)b->address);
42}
43
44RB_GENERATE(mmtree, mm_share, next, mm_compare)
45
46static struct mm_share *
47mm_make_entry(struct mm_master *mm, struct mmtree *head,
48 void *address, size_t size)
49{
50 struct mm_share *tmp, *tmp2;
51
52 if (mm->mmalloc == NULL)
53 tmp = xmalloc(sizeof(struct mm_share));
54 else
55 tmp = mm_xmalloc(mm->mmalloc, sizeof(struct mm_share));
56 tmp->address = address;
57 tmp->size = size;
58
59 tmp2 = RB_INSERT(mmtree, head, tmp);
60 if (tmp2 != NULL)
Ben Lindstromc8615472002-03-26 03:20:45 +000061 fatal("mm_make_entry(%p): double address %p->%p(%lu)",
62 mm, tmp2, address, (u_long)size);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +000063
64 return (tmp);
65}
66
67/* Creates a shared memory area of a certain size */
68
69struct mm_master *
70mm_create(struct mm_master *mmalloc, size_t size)
71{
72 void *address;
73 struct mm_master *mm;
74
75 if (mmalloc == NULL)
76 mm = xmalloc(sizeof(struct mm_master));
77 else
78 mm = mm_xmalloc(mmalloc, sizeof(struct mm_master));
79
80 /*
81 * If the memory map has a mm_master it can be completely
82 * shared including authentication between the child
83 * and the client.
84 */
85 mm->mmalloc = mmalloc;
86
Ben Lindstrom927dfd22002-04-12 18:51:22 +000087#if defined(HAVE_MMAP) && defined(MAP_ANON)
Ben Lindstrom7a2073c2002-03-22 02:30:41 +000088 address = mmap(NULL, size, PROT_WRITE|PROT_READ, MAP_ANON|MAP_SHARED,
89 -1, 0);
90 if (address == MAP_FAILED)
Ben Lindstromc8615472002-03-26 03:20:45 +000091 fatal("mmap(%lu)", (u_long)size);
Kevin Steves86b9fe62002-04-07 17:08:53 +000092#else
93 fatal("%s: UsePrivilegeSeparation=yes not supported",
94 __FUNCTION__);
95#endif
Ben Lindstrom7a2073c2002-03-22 02:30:41 +000096
97 mm->address = address;
98 mm->size = size;
99
100 RB_INIT(&mm->rb_free);
101 RB_INIT(&mm->rb_allocated);
102
103 mm_make_entry(mm, &mm->rb_free, address, size);
104
105 return (mm);
106}
107
108/* Frees either the allocated or the free list */
109
110static void
111mm_freelist(struct mm_master *mmalloc, struct mmtree *head)
112{
113 struct mm_share *mms, *next;
114
115 for (mms = RB_ROOT(head); mms; mms = next) {
116 next = RB_NEXT(mmtree, head, mms);
117 RB_REMOVE(mmtree, head, mms);
118 if (mmalloc == NULL)
119 xfree(mms);
120 else
121 mm_free(mmalloc, mms);
122 }
123}
124
125/* Destroys a memory mapped area */
126
127void
128mm_destroy(struct mm_master *mm)
129{
130 mm_freelist(mm->mmalloc, &mm->rb_free);
131 mm_freelist(mm->mmalloc, &mm->rb_allocated);
132
Kevin Steves265c9d02002-04-07 22:36:49 +0000133#ifdef HAVE_MMAP
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000134 if (munmap(mm->address, mm->size) == -1)
Ben Lindstromc8615472002-03-26 03:20:45 +0000135 fatal("munmap(%p, %lu)", mm->address, (u_long)mm->size);
Kevin Steves265c9d02002-04-07 22:36:49 +0000136#else
137 fatal("%s: UsePrivilegeSeparation=yes not supported",
138 __FUNCTION__);
139#endif
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000140 if (mm->mmalloc == NULL)
141 xfree(mm);
142 else
143 mm_free(mm->mmalloc, mm);
144}
145
146void *
147mm_xmalloc(struct mm_master *mm, size_t size)
148{
149 void *address;
150
151 address = mm_malloc(mm, size);
152 if (address == NULL)
Ben Lindstromc8615472002-03-26 03:20:45 +0000153 fatal("%s: mm_malloc(%lu)", __FUNCTION__, (u_long)size);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000154 return (address);
155}
156
157
158/* Allocates data from a memory mapped area */
159
160void *
161mm_malloc(struct mm_master *mm, size_t size)
162{
163 struct mm_share *mms, *tmp;
164
165 if (size == 0)
166 fatal("mm_malloc: try to allocate 0 space");
167
168 size = ((size + MM_MINSIZE - 1) / MM_MINSIZE) * MM_MINSIZE;
169
170 RB_FOREACH(mms, mmtree, &mm->rb_free) {
171 if (mms->size >= size)
172 break;
173 }
174
175 if (mms == NULL)
176 return (NULL);
177
178 /* Debug */
179 memset(mms->address, 0xd0, size);
180
181 tmp = mm_make_entry(mm, &mm->rb_allocated, mms->address, size);
182
183 /* Does not change order in RB tree */
184 mms->size -= size;
185 mms->address = (u_char *)mms->address + size;
186
187 if (mms->size == 0) {
188 RB_REMOVE(mmtree, &mm->rb_free, mms);
189 if (mm->mmalloc == NULL)
190 xfree(mms);
191 else
192 mm_free(mm->mmalloc, mms);
193 }
194
195 return (tmp->address);
196}
197
198/* Frees memory in a memory mapped area */
199
200void
201mm_free(struct mm_master *mm, void *address)
202{
203 struct mm_share *mms, *prev, tmp;
204
205 tmp.address = address;
206 mms = RB_FIND(mmtree, &mm->rb_allocated, &tmp);
207 if (mms == NULL)
208 fatal("mm_free(%p): can not find %p", mm, address);
209
210 /* Debug */
211 memset(mms->address, 0xd0, mms->size);
212
213 /* Remove from allocated list and insert in free list */
214 RB_REMOVE(mmtree, &mm->rb_allocated, mms);
215 if (RB_INSERT(mmtree, &mm->rb_free, mms) != NULL)
216 fatal("mm_free(%p): double address %p", mm, address);
217
218 /* Find previous entry */
219 prev = mms;
220 if (RB_LEFT(prev, next)) {
221 prev = RB_LEFT(prev, next);
222 while (RB_RIGHT(prev, next))
223 prev = RB_RIGHT(prev, next);
224 } else {
225 if (RB_PARENT(prev, next) &&
226 (prev == RB_RIGHT(RB_PARENT(prev, next), next)))
227 prev = RB_PARENT(prev, next);
228 else {
229 while (RB_PARENT(prev, next) &&
230 (prev == RB_LEFT(RB_PARENT(prev, next), next)))
231 prev = RB_PARENT(prev, next);
232 prev = RB_PARENT(prev, next);
233 }
234 }
235
236 /* Check if range does not overlap */
237 if (prev != NULL && MM_ADDRESS_END(prev) > address)
Ben Lindstromc8615472002-03-26 03:20:45 +0000238 fatal("mm_free: memory corruption: %p(%lu) > %p",
239 prev->address, (u_long)prev->size, address);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000240
241 /* See if we can merge backwards */
242 if (prev != NULL && MM_ADDRESS_END(prev) == address) {
243 prev->size += mms->size;
244 RB_REMOVE(mmtree, &mm->rb_free, mms);
245 if (mm->mmalloc == NULL)
246 xfree(mms);
247 else
248 mm_free(mm->mmalloc, mms);
249 } else
250 prev = mms;
251
252 if (prev == NULL)
253 return;
254
255 /* Check if we can merge forwards */
256 mms = RB_NEXT(mmtree, &mm->rb_free, prev);
257 if (mms == NULL)
258 return;
259
260 if (MM_ADDRESS_END(prev) > mms->address)
Ben Lindstromc8615472002-03-26 03:20:45 +0000261 fatal("mm_free: memory corruption: %p < %p(%lu)",
262 mms->address, prev->address, (u_long)prev->size);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000263 if (MM_ADDRESS_END(prev) != mms->address)
264 return;
265
266 prev->size += mms->size;
267 RB_REMOVE(mmtree, &mm->rb_free, mms);
268
269 if (mm->mmalloc == NULL)
270 xfree(mms);
271 else
272 mm_free(mm->mmalloc, mms);
273}
274
275static void
276mm_sync_list(struct mmtree *oldtree, struct mmtree *newtree,
277 struct mm_master *mm, struct mm_master *mmold)
278{
279 struct mm_master *mmalloc = mm->mmalloc;
280 struct mm_share *mms, *new;
281
282 /* Sync free list */
283 RB_FOREACH(mms, mmtree, oldtree) {
284 /* Check the values */
285 mm_memvalid(mmold, mms, sizeof(struct mm_share));
286 mm_memvalid(mm, mms->address, mms->size);
287
288 new = mm_xmalloc(mmalloc, sizeof(struct mm_share));
289 memcpy(new, mms, sizeof(struct mm_share));
290 RB_INSERT(mmtree, newtree, new);
291 }
292}
293
294void
295mm_share_sync(struct mm_master **pmm, struct mm_master **pmmalloc)
296{
297 struct mm_master *mm;
298 struct mm_master *mmalloc;
299 struct mm_master *mmold;
300 struct mmtree rb_free, rb_allocated;
301
302 debug3("%s: Share sync", __FUNCTION__);
303
304 mm = *pmm;
305 mmold = mm->mmalloc;
306 mm_memvalid(mmold, mm, sizeof(*mm));
307
308 mmalloc = mm_create(NULL, mm->size);
309 mm = mm_xmalloc(mmalloc, sizeof(struct mm_master));
310 memcpy(mm, *pmm, sizeof(struct mm_master));
311 mm->mmalloc = mmalloc;
312
313 rb_free = mm->rb_free;
314 rb_allocated = mm->rb_allocated;
315
316 RB_INIT(&mm->rb_free);
317 RB_INIT(&mm->rb_allocated);
318
319 mm_sync_list(&rb_free, &mm->rb_free, mm, mmold);
320 mm_sync_list(&rb_allocated, &mm->rb_allocated, mm, mmold);
321
322 mm_destroy(mmold);
323
324 *pmm = mm;
325 *pmmalloc = mmalloc;
326
327 debug3("%s: Share sync end", __FUNCTION__);
328}
329
330void
331mm_memvalid(struct mm_master *mm, void *address, size_t size)
332{
333 void *end = (u_char *)address + size;
334
335 if (address < mm->address)
336 fatal("mm_memvalid: address too small: %p", address);
337 if (end < address)
338 fatal("mm_memvalid: end < address: %p < %p", end, address);
339 if (end > (void *)((u_char *)mm->address + mm->size))
340 fatal("mm_memvalid: address too large: %p", address);
341}