Ben Lindstrom | 7a2073c | 2002-03-22 02:30:41 +0000 | [diff] [blame] | 1 | /* |
| 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 Lindstrom | 7d9c38f | 2002-06-06 21:40:51 +0000 | [diff] [blame^] | 27 | RCSID("$OpenBSD: monitor_mm.c,v 1.6 2002/06/04 23:05:49 markus Exp $"); |
Ben Lindstrom | 7a2073c | 2002-03-22 02:30:41 +0000 | [diff] [blame] | 28 | |
Kevin Steves | 86b9fe6 | 2002-04-07 17:08:53 +0000 | [diff] [blame] | 29 | #ifdef HAVE_SYS_MMAN_H |
Ben Lindstrom | 7a2073c | 2002-03-22 02:30:41 +0000 | [diff] [blame] | 30 | #include <sys/mman.h> |
Kevin Steves | 86b9fe6 | 2002-04-07 17:08:53 +0000 | [diff] [blame] | 31 | #endif |
Ben Lindstrom | 7a2073c | 2002-03-22 02:30:41 +0000 | [diff] [blame] | 32 | |
| 33 | #include "ssh.h" |
| 34 | #include "xmalloc.h" |
| 35 | #include "log.h" |
| 36 | #include "monitor_mm.h" |
| 37 | |
| 38 | static int |
| 39 | mm_compare(struct mm_share *a, struct mm_share *b) |
| 40 | { |
| 41 | return ((char *)a->address - (char *)b->address); |
| 42 | } |
| 43 | |
| 44 | RB_GENERATE(mmtree, mm_share, next, mm_compare) |
| 45 | |
| 46 | static struct mm_share * |
| 47 | mm_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 Lindstrom | c861547 | 2002-03-26 03:20:45 +0000 | [diff] [blame] | 61 | fatal("mm_make_entry(%p): double address %p->%p(%lu)", |
| 62 | mm, tmp2, address, (u_long)size); |
Ben Lindstrom | 7a2073c | 2002-03-22 02:30:41 +0000 | [diff] [blame] | 63 | |
| 64 | return (tmp); |
| 65 | } |
| 66 | |
| 67 | /* Creates a shared memory area of a certain size */ |
| 68 | |
| 69 | struct mm_master * |
| 70 | mm_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 Lindstrom | 927dfd2 | 2002-04-12 18:51:22 +0000 | [diff] [blame] | 87 | #if defined(HAVE_MMAP) && defined(MAP_ANON) |
Ben Lindstrom | 7a2073c | 2002-03-22 02:30:41 +0000 | [diff] [blame] | 88 | address = mmap(NULL, size, PROT_WRITE|PROT_READ, MAP_ANON|MAP_SHARED, |
| 89 | -1, 0); |
| 90 | if (address == MAP_FAILED) |
Ben Lindstrom | 105ccbe | 2002-06-06 20:33:06 +0000 | [diff] [blame] | 91 | fatal("mmap(%lu): %s", (u_long)size, strerror(errnor)); |
Kevin Steves | 86b9fe6 | 2002-04-07 17:08:53 +0000 | [diff] [blame] | 92 | #else |
| 93 | fatal("%s: UsePrivilegeSeparation=yes not supported", |
Ben Lindstrom | 7d9c38f | 2002-06-06 21:40:51 +0000 | [diff] [blame^] | 94 | __func__); |
Kevin Steves | 86b9fe6 | 2002-04-07 17:08:53 +0000 | [diff] [blame] | 95 | #endif |
Ben Lindstrom | 7a2073c | 2002-03-22 02:30:41 +0000 | [diff] [blame] | 96 | |
| 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 | |
| 110 | static void |
| 111 | mm_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 | |
| 127 | void |
| 128 | mm_destroy(struct mm_master *mm) |
| 129 | { |
| 130 | mm_freelist(mm->mmalloc, &mm->rb_free); |
| 131 | mm_freelist(mm->mmalloc, &mm->rb_allocated); |
| 132 | |
Kevin Steves | 265c9d0 | 2002-04-07 22:36:49 +0000 | [diff] [blame] | 133 | #ifdef HAVE_MMAP |
Ben Lindstrom | 7a2073c | 2002-03-22 02:30:41 +0000 | [diff] [blame] | 134 | if (munmap(mm->address, mm->size) == -1) |
Ben Lindstrom | 105ccbe | 2002-06-06 20:33:06 +0000 | [diff] [blame] | 135 | fatal("munmap(%p, %lu): %s", mm->address, (u_long)mm->size |
| 136 | strerror(errno)); |
Kevin Steves | 265c9d0 | 2002-04-07 22:36:49 +0000 | [diff] [blame] | 137 | #else |
| 138 | fatal("%s: UsePrivilegeSeparation=yes not supported", |
Ben Lindstrom | 7d9c38f | 2002-06-06 21:40:51 +0000 | [diff] [blame^] | 139 | __func__); |
Kevin Steves | 265c9d0 | 2002-04-07 22:36:49 +0000 | [diff] [blame] | 140 | #endif |
Ben Lindstrom | 7a2073c | 2002-03-22 02:30:41 +0000 | [diff] [blame] | 141 | if (mm->mmalloc == NULL) |
| 142 | xfree(mm); |
| 143 | else |
| 144 | mm_free(mm->mmalloc, mm); |
| 145 | } |
| 146 | |
| 147 | void * |
| 148 | mm_xmalloc(struct mm_master *mm, size_t size) |
| 149 | { |
| 150 | void *address; |
| 151 | |
| 152 | address = mm_malloc(mm, size); |
| 153 | if (address == NULL) |
Ben Lindstrom | 7d9c38f | 2002-06-06 21:40:51 +0000 | [diff] [blame^] | 154 | fatal("%s: mm_malloc(%lu)", __func__, (u_long)size); |
Ben Lindstrom | 7a2073c | 2002-03-22 02:30:41 +0000 | [diff] [blame] | 155 | return (address); |
| 156 | } |
| 157 | |
| 158 | |
| 159 | /* Allocates data from a memory mapped area */ |
| 160 | |
| 161 | void * |
| 162 | mm_malloc(struct mm_master *mm, size_t size) |
| 163 | { |
| 164 | struct mm_share *mms, *tmp; |
| 165 | |
| 166 | if (size == 0) |
| 167 | fatal("mm_malloc: try to allocate 0 space"); |
| 168 | |
| 169 | size = ((size + MM_MINSIZE - 1) / MM_MINSIZE) * MM_MINSIZE; |
| 170 | |
| 171 | RB_FOREACH(mms, mmtree, &mm->rb_free) { |
| 172 | if (mms->size >= size) |
| 173 | break; |
| 174 | } |
| 175 | |
| 176 | if (mms == NULL) |
| 177 | return (NULL); |
| 178 | |
| 179 | /* Debug */ |
| 180 | memset(mms->address, 0xd0, size); |
| 181 | |
| 182 | tmp = mm_make_entry(mm, &mm->rb_allocated, mms->address, size); |
| 183 | |
| 184 | /* Does not change order in RB tree */ |
| 185 | mms->size -= size; |
| 186 | mms->address = (u_char *)mms->address + size; |
| 187 | |
| 188 | if (mms->size == 0) { |
| 189 | RB_REMOVE(mmtree, &mm->rb_free, mms); |
| 190 | if (mm->mmalloc == NULL) |
| 191 | xfree(mms); |
| 192 | else |
| 193 | mm_free(mm->mmalloc, mms); |
| 194 | } |
| 195 | |
| 196 | return (tmp->address); |
| 197 | } |
| 198 | |
| 199 | /* Frees memory in a memory mapped area */ |
| 200 | |
| 201 | void |
| 202 | mm_free(struct mm_master *mm, void *address) |
| 203 | { |
| 204 | struct mm_share *mms, *prev, tmp; |
| 205 | |
| 206 | tmp.address = address; |
| 207 | mms = RB_FIND(mmtree, &mm->rb_allocated, &tmp); |
| 208 | if (mms == NULL) |
| 209 | fatal("mm_free(%p): can not find %p", mm, address); |
| 210 | |
| 211 | /* Debug */ |
| 212 | memset(mms->address, 0xd0, mms->size); |
| 213 | |
| 214 | /* Remove from allocated list and insert in free list */ |
| 215 | RB_REMOVE(mmtree, &mm->rb_allocated, mms); |
| 216 | if (RB_INSERT(mmtree, &mm->rb_free, mms) != NULL) |
| 217 | fatal("mm_free(%p): double address %p", mm, address); |
| 218 | |
| 219 | /* Find previous entry */ |
| 220 | prev = mms; |
| 221 | if (RB_LEFT(prev, next)) { |
| 222 | prev = RB_LEFT(prev, next); |
| 223 | while (RB_RIGHT(prev, next)) |
| 224 | prev = RB_RIGHT(prev, next); |
| 225 | } else { |
| 226 | if (RB_PARENT(prev, next) && |
| 227 | (prev == RB_RIGHT(RB_PARENT(prev, next), next))) |
| 228 | prev = RB_PARENT(prev, next); |
| 229 | else { |
| 230 | while (RB_PARENT(prev, next) && |
| 231 | (prev == RB_LEFT(RB_PARENT(prev, next), next))) |
| 232 | prev = RB_PARENT(prev, next); |
| 233 | prev = RB_PARENT(prev, next); |
| 234 | } |
| 235 | } |
| 236 | |
| 237 | /* Check if range does not overlap */ |
| 238 | if (prev != NULL && MM_ADDRESS_END(prev) > address) |
Ben Lindstrom | c861547 | 2002-03-26 03:20:45 +0000 | [diff] [blame] | 239 | fatal("mm_free: memory corruption: %p(%lu) > %p", |
| 240 | prev->address, (u_long)prev->size, address); |
Ben Lindstrom | 7a2073c | 2002-03-22 02:30:41 +0000 | [diff] [blame] | 241 | |
| 242 | /* See if we can merge backwards */ |
| 243 | if (prev != NULL && MM_ADDRESS_END(prev) == address) { |
| 244 | prev->size += mms->size; |
| 245 | RB_REMOVE(mmtree, &mm->rb_free, mms); |
| 246 | if (mm->mmalloc == NULL) |
| 247 | xfree(mms); |
| 248 | else |
| 249 | mm_free(mm->mmalloc, mms); |
| 250 | } else |
| 251 | prev = mms; |
| 252 | |
| 253 | if (prev == NULL) |
| 254 | return; |
| 255 | |
| 256 | /* Check if we can merge forwards */ |
| 257 | mms = RB_NEXT(mmtree, &mm->rb_free, prev); |
| 258 | if (mms == NULL) |
| 259 | return; |
| 260 | |
| 261 | if (MM_ADDRESS_END(prev) > mms->address) |
Ben Lindstrom | c861547 | 2002-03-26 03:20:45 +0000 | [diff] [blame] | 262 | fatal("mm_free: memory corruption: %p < %p(%lu)", |
| 263 | mms->address, prev->address, (u_long)prev->size); |
Ben Lindstrom | 7a2073c | 2002-03-22 02:30:41 +0000 | [diff] [blame] | 264 | if (MM_ADDRESS_END(prev) != mms->address) |
| 265 | return; |
| 266 | |
| 267 | prev->size += mms->size; |
| 268 | RB_REMOVE(mmtree, &mm->rb_free, mms); |
| 269 | |
| 270 | if (mm->mmalloc == NULL) |
| 271 | xfree(mms); |
| 272 | else |
| 273 | mm_free(mm->mmalloc, mms); |
| 274 | } |
| 275 | |
| 276 | static void |
| 277 | mm_sync_list(struct mmtree *oldtree, struct mmtree *newtree, |
| 278 | struct mm_master *mm, struct mm_master *mmold) |
| 279 | { |
| 280 | struct mm_master *mmalloc = mm->mmalloc; |
| 281 | struct mm_share *mms, *new; |
| 282 | |
| 283 | /* Sync free list */ |
| 284 | RB_FOREACH(mms, mmtree, oldtree) { |
| 285 | /* Check the values */ |
| 286 | mm_memvalid(mmold, mms, sizeof(struct mm_share)); |
| 287 | mm_memvalid(mm, mms->address, mms->size); |
| 288 | |
| 289 | new = mm_xmalloc(mmalloc, sizeof(struct mm_share)); |
| 290 | memcpy(new, mms, sizeof(struct mm_share)); |
| 291 | RB_INSERT(mmtree, newtree, new); |
| 292 | } |
| 293 | } |
| 294 | |
| 295 | void |
| 296 | mm_share_sync(struct mm_master **pmm, struct mm_master **pmmalloc) |
| 297 | { |
| 298 | struct mm_master *mm; |
| 299 | struct mm_master *mmalloc; |
| 300 | struct mm_master *mmold; |
| 301 | struct mmtree rb_free, rb_allocated; |
| 302 | |
Ben Lindstrom | 7d9c38f | 2002-06-06 21:40:51 +0000 | [diff] [blame^] | 303 | debug3("%s: Share sync", __func__); |
Ben Lindstrom | 7a2073c | 2002-03-22 02:30:41 +0000 | [diff] [blame] | 304 | |
| 305 | mm = *pmm; |
| 306 | mmold = mm->mmalloc; |
| 307 | mm_memvalid(mmold, mm, sizeof(*mm)); |
| 308 | |
| 309 | mmalloc = mm_create(NULL, mm->size); |
| 310 | mm = mm_xmalloc(mmalloc, sizeof(struct mm_master)); |
| 311 | memcpy(mm, *pmm, sizeof(struct mm_master)); |
| 312 | mm->mmalloc = mmalloc; |
| 313 | |
| 314 | rb_free = mm->rb_free; |
| 315 | rb_allocated = mm->rb_allocated; |
| 316 | |
| 317 | RB_INIT(&mm->rb_free); |
| 318 | RB_INIT(&mm->rb_allocated); |
| 319 | |
| 320 | mm_sync_list(&rb_free, &mm->rb_free, mm, mmold); |
| 321 | mm_sync_list(&rb_allocated, &mm->rb_allocated, mm, mmold); |
| 322 | |
| 323 | mm_destroy(mmold); |
| 324 | |
| 325 | *pmm = mm; |
| 326 | *pmmalloc = mmalloc; |
| 327 | |
Ben Lindstrom | 7d9c38f | 2002-06-06 21:40:51 +0000 | [diff] [blame^] | 328 | debug3("%s: Share sync end", __func__); |
Ben Lindstrom | 7a2073c | 2002-03-22 02:30:41 +0000 | [diff] [blame] | 329 | } |
| 330 | |
| 331 | void |
| 332 | mm_memvalid(struct mm_master *mm, void *address, size_t size) |
| 333 | { |
| 334 | void *end = (u_char *)address + size; |
| 335 | |
| 336 | if (address < mm->address) |
| 337 | fatal("mm_memvalid: address too small: %p", address); |
| 338 | if (end < address) |
| 339 | fatal("mm_memvalid: end < address: %p < %p", end, address); |
| 340 | if (end > (void *)((u_char *)mm->address + mm->size)) |
| 341 | fatal("mm_memvalid: address too large: %p", address); |
| 342 | } |