| 1 | /* $NetBSD: uvm_mmap.c,v 1.162 2016/08/09 12:17:04 kre Exp $ */ |
| 2 | |
| 3 | /* |
| 4 | * Copyright (c) 1997 Charles D. Cranor and Washington University. |
| 5 | * Copyright (c) 1991, 1993 The Regents of the University of California. |
| 6 | * Copyright (c) 1988 University of Utah. |
| 7 | * |
| 8 | * All rights reserved. |
| 9 | * |
| 10 | * This code is derived from software contributed to Berkeley by |
| 11 | * the Systems Programming Group of the University of Utah Computer |
| 12 | * Science Department. |
| 13 | * |
| 14 | * Redistribution and use in source and binary forms, with or without |
| 15 | * modification, are permitted provided that the following conditions |
| 16 | * are met: |
| 17 | * 1. Redistributions of source code must retain the above copyright |
| 18 | * notice, this list of conditions and the following disclaimer. |
| 19 | * 2. Redistributions in binary form must reproduce the above copyright |
| 20 | * notice, this list of conditions and the following disclaimer in the |
| 21 | * documentation and/or other materials provided with the distribution. |
| 22 | * 3. Neither the name of the University nor the names of its contributors |
| 23 | * may be used to endorse or promote products derived from this software |
| 24 | * without specific prior written permission. |
| 25 | * |
| 26 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
| 27 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| 28 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| 29 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
| 30 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| 31 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
| 32 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| 33 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
| 34 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
| 35 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| 36 | * SUCH DAMAGE. |
| 37 | * |
| 38 | * from: Utah $Hdr: vm_mmap.c 1.6 91/10/21$ |
| 39 | * @(#)vm_mmap.c 8.5 (Berkeley) 5/19/94 |
| 40 | * from: Id: uvm_mmap.c,v 1.1.2.14 1998/01/05 21:04:26 chuck Exp |
| 41 | */ |
| 42 | |
| 43 | /* |
| 44 | * uvm_mmap.c: system call interface into VM system, plus kernel vm_mmap |
| 45 | * function. |
| 46 | */ |
| 47 | |
| 48 | #include <sys/cdefs.h> |
| 49 | __KERNEL_RCSID(0, "$NetBSD: uvm_mmap.c,v 1.162 2016/08/09 12:17:04 kre Exp $" ); |
| 50 | |
| 51 | #include "opt_compat_netbsd.h" |
| 52 | #include "opt_pax.h" |
| 53 | |
| 54 | #include <sys/types.h> |
| 55 | #include <sys/file.h> |
| 56 | #include <sys/filedesc.h> |
| 57 | #include <sys/resourcevar.h> |
| 58 | #include <sys/mman.h> |
| 59 | #include <sys/pax.h> |
| 60 | |
| 61 | #include <sys/syscallargs.h> |
| 62 | |
| 63 | #include <uvm/uvm.h> |
| 64 | #include <uvm/uvm_device.h> |
| 65 | |
| 66 | static int uvm_mmap(struct vm_map *, vaddr_t *, vsize_t, vm_prot_t, vm_prot_t, |
| 67 | int, int, struct uvm_object *, voff_t, vsize_t); |
| 68 | |
| 69 | static int |
| 70 | range_test(struct vm_map *map, vaddr_t addr, vsize_t size, bool ismmap) |
| 71 | { |
| 72 | vaddr_t vm_min_address = vm_map_min(map); |
| 73 | vaddr_t vm_max_address = vm_map_max(map); |
| 74 | vaddr_t eaddr = addr + size; |
| 75 | int res = 0; |
| 76 | |
| 77 | if (addr < vm_min_address) |
| 78 | return EINVAL; |
| 79 | if (eaddr > vm_max_address) |
| 80 | return ismmap ? EFBIG : EINVAL; |
| 81 | if (addr > eaddr) /* no wrapping! */ |
| 82 | return ismmap ? EOVERFLOW : EINVAL; |
| 83 | |
| 84 | #ifdef MD_MMAP_RANGE_TEST |
| 85 | res = MD_MMAP_RANGE_TEST(addr, eaddr); |
| 86 | #endif |
| 87 | |
| 88 | return res; |
| 89 | } |
| 90 | |
| 91 | /* |
| 92 | * unimplemented VM system calls: |
| 93 | */ |
| 94 | |
| 95 | /* |
| 96 | * sys_sbrk: sbrk system call. |
| 97 | */ |
| 98 | |
| 99 | /* ARGSUSED */ |
| 100 | int |
| 101 | sys_sbrk(struct lwp *l, const struct sys_sbrk_args *uap, register_t *retval) |
| 102 | { |
| 103 | /* { |
| 104 | syscallarg(intptr_t) incr; |
| 105 | } */ |
| 106 | |
| 107 | return ENOSYS; |
| 108 | } |
| 109 | |
| 110 | /* |
| 111 | * sys_sstk: sstk system call. |
| 112 | */ |
| 113 | |
| 114 | /* ARGSUSED */ |
| 115 | int |
| 116 | sys_sstk(struct lwp *l, const struct sys_sstk_args *uap, register_t *retval) |
| 117 | { |
| 118 | /* { |
| 119 | syscallarg(int) incr; |
| 120 | } */ |
| 121 | |
| 122 | return ENOSYS; |
| 123 | } |
| 124 | |
| 125 | /* |
| 126 | * sys_mincore: determine if pages are in core or not. |
| 127 | */ |
| 128 | |
| 129 | /* ARGSUSED */ |
| 130 | int |
| 131 | sys_mincore(struct lwp *l, const struct sys_mincore_args *uap, |
| 132 | register_t *retval) |
| 133 | { |
| 134 | /* { |
| 135 | syscallarg(void *) addr; |
| 136 | syscallarg(size_t) len; |
| 137 | syscallarg(char *) vec; |
| 138 | } */ |
| 139 | struct proc *p = l->l_proc; |
| 140 | struct vm_page *pg; |
| 141 | char *vec, pgi; |
| 142 | struct uvm_object *uobj; |
| 143 | struct vm_amap *amap; |
| 144 | struct vm_anon *anon; |
| 145 | struct vm_map_entry *entry; |
| 146 | vaddr_t start, end, lim; |
| 147 | struct vm_map *map; |
| 148 | vsize_t len; |
| 149 | int error = 0, npgs; |
| 150 | |
| 151 | map = &p->p_vmspace->vm_map; |
| 152 | |
| 153 | start = (vaddr_t)SCARG(uap, addr); |
| 154 | len = SCARG(uap, len); |
| 155 | vec = SCARG(uap, vec); |
| 156 | |
| 157 | if (start & PAGE_MASK) |
| 158 | return EINVAL; |
| 159 | len = round_page(len); |
| 160 | end = start + len; |
| 161 | if (end <= start) |
| 162 | return EINVAL; |
| 163 | |
| 164 | /* |
| 165 | * Lock down vec, so our returned status isn't outdated by |
| 166 | * storing the status byte for a page. |
| 167 | */ |
| 168 | |
| 169 | npgs = len >> PAGE_SHIFT; |
| 170 | error = uvm_vslock(p->p_vmspace, vec, npgs, VM_PROT_WRITE); |
| 171 | if (error) { |
| 172 | return error; |
| 173 | } |
| 174 | vm_map_lock_read(map); |
| 175 | |
| 176 | if (uvm_map_lookup_entry(map, start, &entry) == false) { |
| 177 | error = ENOMEM; |
| 178 | goto out; |
| 179 | } |
| 180 | |
| 181 | for (/* nothing */; |
| 182 | entry != &map->header && entry->start < end; |
| 183 | entry = entry->next) { |
| 184 | KASSERT(!UVM_ET_ISSUBMAP(entry)); |
| 185 | KASSERT(start >= entry->start); |
| 186 | |
| 187 | /* Make sure there are no holes. */ |
| 188 | if (entry->end < end && |
| 189 | (entry->next == &map->header || |
| 190 | entry->next->start > entry->end)) { |
| 191 | error = ENOMEM; |
| 192 | goto out; |
| 193 | } |
| 194 | |
| 195 | lim = end < entry->end ? end : entry->end; |
| 196 | |
| 197 | /* |
| 198 | * Special case for objects with no "real" pages. Those |
| 199 | * are always considered resident (mapped devices). |
| 200 | */ |
| 201 | |
| 202 | if (UVM_ET_ISOBJ(entry)) { |
| 203 | KASSERT(!UVM_OBJ_IS_KERN_OBJECT(entry->object.uvm_obj)); |
| 204 | if (UVM_OBJ_IS_DEVICE(entry->object.uvm_obj)) { |
| 205 | for (/* nothing */; start < lim; |
| 206 | start += PAGE_SIZE, vec++) |
| 207 | subyte(vec, 1); |
| 208 | continue; |
| 209 | } |
| 210 | } |
| 211 | |
| 212 | amap = entry->aref.ar_amap; /* upper layer */ |
| 213 | uobj = entry->object.uvm_obj; /* lower layer */ |
| 214 | |
| 215 | if (amap != NULL) |
| 216 | amap_lock(amap); |
| 217 | if (uobj != NULL) |
| 218 | mutex_enter(uobj->vmobjlock); |
| 219 | |
| 220 | for (/* nothing */; start < lim; start += PAGE_SIZE, vec++) { |
| 221 | pgi = 0; |
| 222 | if (amap != NULL) { |
| 223 | /* Check the upper layer first. */ |
| 224 | anon = amap_lookup(&entry->aref, |
| 225 | start - entry->start); |
| 226 | /* Don't need to lock anon here. */ |
| 227 | if (anon != NULL && anon->an_page != NULL) { |
| 228 | |
| 229 | /* |
| 230 | * Anon has the page for this entry |
| 231 | * offset. |
| 232 | */ |
| 233 | |
| 234 | pgi = 1; |
| 235 | } |
| 236 | } |
| 237 | if (uobj != NULL && pgi == 0) { |
| 238 | /* Check the lower layer. */ |
| 239 | pg = uvm_pagelookup(uobj, |
| 240 | entry->offset + (start - entry->start)); |
| 241 | if (pg != NULL) { |
| 242 | |
| 243 | /* |
| 244 | * Object has the page for this entry |
| 245 | * offset. |
| 246 | */ |
| 247 | |
| 248 | pgi = 1; |
| 249 | } |
| 250 | } |
| 251 | (void) subyte(vec, pgi); |
| 252 | } |
| 253 | if (uobj != NULL) |
| 254 | mutex_exit(uobj->vmobjlock); |
| 255 | if (amap != NULL) |
| 256 | amap_unlock(amap); |
| 257 | } |
| 258 | |
| 259 | out: |
| 260 | vm_map_unlock_read(map); |
| 261 | uvm_vsunlock(p->p_vmspace, SCARG(uap, vec), npgs); |
| 262 | return error; |
| 263 | } |
| 264 | |
| 265 | /* |
| 266 | * sys_mmap: mmap system call. |
| 267 | * |
| 268 | * => file offset and address may not be page aligned |
| 269 | * - if MAP_FIXED, offset and address must have remainder mod PAGE_SIZE |
| 270 | * - if address isn't page aligned the mapping starts at trunc_page(addr) |
| 271 | * and the return value is adjusted up by the page offset. |
| 272 | */ |
| 273 | |
| 274 | int |
| 275 | sys_mmap(struct lwp *l, const struct sys_mmap_args *uap, register_t *retval) |
| 276 | { |
| 277 | /* { |
| 278 | syscallarg(void *) addr; |
| 279 | syscallarg(size_t) len; |
| 280 | syscallarg(int) prot; |
| 281 | syscallarg(int) flags; |
| 282 | syscallarg(int) fd; |
| 283 | syscallarg(long) pad; |
| 284 | syscallarg(off_t) pos; |
| 285 | } */ |
| 286 | struct proc *p = l->l_proc; |
| 287 | vaddr_t addr; |
| 288 | off_t pos; |
| 289 | vsize_t size, pageoff, newsize; |
| 290 | vm_prot_t prot, maxprot; |
| 291 | int flags, fd, advice; |
| 292 | vaddr_t defaddr; |
| 293 | struct file *fp = NULL; |
| 294 | struct uvm_object *uobj; |
| 295 | int error; |
| 296 | #ifdef PAX_ASLR |
| 297 | vaddr_t orig_addr; |
| 298 | #endif /* PAX_ASLR */ |
| 299 | |
| 300 | /* |
| 301 | * first, extract syscall args from the uap. |
| 302 | */ |
| 303 | |
| 304 | addr = (vaddr_t)SCARG(uap, addr); |
| 305 | size = (vsize_t)SCARG(uap, len); |
| 306 | prot = SCARG(uap, prot) & VM_PROT_ALL; |
| 307 | flags = SCARG(uap, flags); |
| 308 | fd = SCARG(uap, fd); |
| 309 | pos = SCARG(uap, pos); |
| 310 | |
| 311 | #ifdef PAX_ASLR |
| 312 | orig_addr = addr; |
| 313 | #endif /* PAX_ASLR */ |
| 314 | |
| 315 | /* |
| 316 | * Fixup the old deprecated MAP_COPY into MAP_PRIVATE, and |
| 317 | * validate the flags. |
| 318 | */ |
| 319 | if (flags & MAP_COPY) { |
| 320 | flags = (flags & ~MAP_COPY) | MAP_PRIVATE; |
| 321 | #if defined(COMPAT_10) && defined(__i386__) |
| 322 | /* |
| 323 | * Ancient kernel on x86 did not obey PROT_EXEC on i386 at least |
| 324 | * and ld.so did not turn it on. We take care of this on amd64 |
| 325 | * in compat32. |
| 326 | */ |
| 327 | prot |= PROT_EXEC; |
| 328 | #endif |
| 329 | } |
| 330 | if ((flags & (MAP_SHARED|MAP_PRIVATE)) == (MAP_SHARED|MAP_PRIVATE)) |
| 331 | return EINVAL; |
| 332 | |
| 333 | /* |
| 334 | * align file position and save offset. adjust size. |
| 335 | */ |
| 336 | |
| 337 | pageoff = (pos & PAGE_MASK); |
| 338 | pos -= pageoff; |
| 339 | newsize = size + pageoff; /* add offset */ |
| 340 | newsize = (vsize_t)round_page(newsize); /* round up */ |
| 341 | |
| 342 | if (newsize < size) |
| 343 | return ENOMEM; |
| 344 | size = newsize; |
| 345 | |
| 346 | /* |
| 347 | * now check (MAP_FIXED) or get (!MAP_FIXED) the "addr" |
| 348 | */ |
| 349 | if (flags & MAP_FIXED) { |
| 350 | /* ensure address and file offset are aligned properly */ |
| 351 | addr -= pageoff; |
| 352 | if (addr & PAGE_MASK) |
| 353 | return EINVAL; |
| 354 | |
| 355 | error = range_test(&p->p_vmspace->vm_map, addr, size, true); |
| 356 | if (error) { |
| 357 | return error; |
| 358 | } |
| 359 | } else if (addr == 0 || !(flags & MAP_TRYFIXED)) { |
| 360 | /* |
| 361 | * not fixed: make sure we skip over the largest |
| 362 | * possible heap for non-topdown mapping arrangements. |
| 363 | * we will refine our guess later (e.g. to account for |
| 364 | * VAC, etc) |
| 365 | */ |
| 366 | |
| 367 | defaddr = p->p_emul->e_vm_default_addr(p, |
| 368 | (vaddr_t)p->p_vmspace->vm_daddr, size, |
| 369 | p->p_vmspace->vm_map.flags & VM_MAP_TOPDOWN); |
| 370 | |
| 371 | if (addr == 0 || !(p->p_vmspace->vm_map.flags & VM_MAP_TOPDOWN)) |
| 372 | addr = MAX(addr, defaddr); |
| 373 | else |
| 374 | addr = MIN(addr, defaddr); |
| 375 | } |
| 376 | |
| 377 | /* |
| 378 | * check for file mappings (i.e. not anonymous) and verify file. |
| 379 | */ |
| 380 | |
| 381 | advice = UVM_ADV_NORMAL; |
| 382 | if ((flags & MAP_ANON) == 0) { |
| 383 | if ((fp = fd_getfile(fd)) == NULL) |
| 384 | return EBADF; |
| 385 | |
| 386 | if (fp->f_ops->fo_mmap == NULL) { |
| 387 | error = ENODEV; |
| 388 | goto out; |
| 389 | } |
| 390 | error = (*fp->f_ops->fo_mmap)(fp, &pos, size, prot, &flags, |
| 391 | &advice, &uobj, &maxprot); |
| 392 | if (error) { |
| 393 | goto out; |
| 394 | } |
| 395 | if (uobj == NULL) { |
| 396 | flags |= MAP_ANON; |
| 397 | fd_putfile(fd); |
| 398 | fp = NULL; |
| 399 | goto is_anon; |
| 400 | } |
| 401 | } else { /* MAP_ANON case */ |
| 402 | /* |
| 403 | * XXX What do we do about (MAP_SHARED|MAP_PRIVATE) == 0? |
| 404 | */ |
| 405 | if (fd != -1) |
| 406 | return EINVAL; |
| 407 | |
| 408 | is_anon: /* label for SunOS style /dev/zero */ |
| 409 | uobj = NULL; |
| 410 | maxprot = VM_PROT_ALL; |
| 411 | pos = 0; |
| 412 | } |
| 413 | |
| 414 | PAX_MPROTECT_ADJUST(l, &prot, &maxprot); |
| 415 | |
| 416 | pax_aslr_mmap(l, &addr, orig_addr, flags); |
| 417 | |
| 418 | /* |
| 419 | * now let kernel internal function uvm_mmap do the work. |
| 420 | */ |
| 421 | |
| 422 | error = uvm_mmap(&p->p_vmspace->vm_map, &addr, size, prot, maxprot, |
| 423 | flags, advice, uobj, pos, p->p_rlimit[RLIMIT_MEMLOCK].rlim_cur); |
| 424 | |
| 425 | /* remember to add offset */ |
| 426 | *retval = (register_t)(addr + pageoff); |
| 427 | |
| 428 | out: |
| 429 | if (fp != NULL) |
| 430 | fd_putfile(fd); |
| 431 | |
| 432 | return error; |
| 433 | } |
| 434 | |
| 435 | /* |
| 436 | * sys___msync13: the msync system call (a front-end for flush) |
| 437 | */ |
| 438 | |
| 439 | int |
| 440 | sys___msync13(struct lwp *l, const struct sys___msync13_args *uap, |
| 441 | register_t *retval) |
| 442 | { |
| 443 | /* { |
| 444 | syscallarg(void *) addr; |
| 445 | syscallarg(size_t) len; |
| 446 | syscallarg(int) flags; |
| 447 | } */ |
| 448 | struct proc *p = l->l_proc; |
| 449 | vaddr_t addr; |
| 450 | vsize_t size, pageoff; |
| 451 | struct vm_map *map; |
| 452 | int error, flags, uvmflags; |
| 453 | bool rv; |
| 454 | |
| 455 | /* |
| 456 | * extract syscall args from the uap |
| 457 | */ |
| 458 | |
| 459 | addr = (vaddr_t)SCARG(uap, addr); |
| 460 | size = (vsize_t)SCARG(uap, len); |
| 461 | flags = SCARG(uap, flags); |
| 462 | |
| 463 | /* sanity check flags */ |
| 464 | if ((flags & ~(MS_ASYNC | MS_SYNC | MS_INVALIDATE)) != 0 || |
| 465 | (flags & (MS_ASYNC | MS_SYNC | MS_INVALIDATE)) == 0 || |
| 466 | (flags & (MS_ASYNC | MS_SYNC)) == (MS_ASYNC | MS_SYNC)) |
| 467 | return EINVAL; |
| 468 | if ((flags & (MS_ASYNC | MS_SYNC)) == 0) |
| 469 | flags |= MS_SYNC; |
| 470 | |
| 471 | /* |
| 472 | * align the address to a page boundary and adjust the size accordingly. |
| 473 | */ |
| 474 | |
| 475 | pageoff = (addr & PAGE_MASK); |
| 476 | addr -= pageoff; |
| 477 | size += pageoff; |
| 478 | size = (vsize_t)round_page(size); |
| 479 | |
| 480 | |
| 481 | /* |
| 482 | * get map |
| 483 | */ |
| 484 | map = &p->p_vmspace->vm_map; |
| 485 | |
| 486 | error = range_test(map, addr, size, false); |
| 487 | if (error) |
| 488 | return ENOMEM; |
| 489 | |
| 490 | /* |
| 491 | * XXXCDC: do we really need this semantic? |
| 492 | * |
| 493 | * XXX Gak! If size is zero we are supposed to sync "all modified |
| 494 | * pages with the region containing addr". Unfortunately, we |
| 495 | * don't really keep track of individual mmaps so we approximate |
| 496 | * by flushing the range of the map entry containing addr. |
| 497 | * This can be incorrect if the region splits or is coalesced |
| 498 | * with a neighbor. |
| 499 | */ |
| 500 | |
| 501 | if (size == 0) { |
| 502 | struct vm_map_entry *entry; |
| 503 | |
| 504 | vm_map_lock_read(map); |
| 505 | rv = uvm_map_lookup_entry(map, addr, &entry); |
| 506 | if (rv == true) { |
| 507 | addr = entry->start; |
| 508 | size = entry->end - entry->start; |
| 509 | } |
| 510 | vm_map_unlock_read(map); |
| 511 | if (rv == false) |
| 512 | return EINVAL; |
| 513 | } |
| 514 | |
| 515 | /* |
| 516 | * translate MS_ flags into PGO_ flags |
| 517 | */ |
| 518 | |
| 519 | uvmflags = PGO_CLEANIT; |
| 520 | if (flags & MS_INVALIDATE) |
| 521 | uvmflags |= PGO_FREE; |
| 522 | if (flags & MS_SYNC) |
| 523 | uvmflags |= PGO_SYNCIO; |
| 524 | |
| 525 | error = uvm_map_clean(map, addr, addr+size, uvmflags); |
| 526 | return error; |
| 527 | } |
| 528 | |
| 529 | /* |
| 530 | * sys_munmap: unmap a users memory |
| 531 | */ |
| 532 | |
| 533 | int |
| 534 | sys_munmap(struct lwp *l, const struct sys_munmap_args *uap, register_t *retval) |
| 535 | { |
| 536 | /* { |
| 537 | syscallarg(void *) addr; |
| 538 | syscallarg(size_t) len; |
| 539 | } */ |
| 540 | struct proc *p = l->l_proc; |
| 541 | vaddr_t addr; |
| 542 | vsize_t size, pageoff; |
| 543 | struct vm_map *map; |
| 544 | struct vm_map_entry *dead_entries; |
| 545 | int error; |
| 546 | |
| 547 | /* |
| 548 | * get syscall args. |
| 549 | */ |
| 550 | |
| 551 | addr = (vaddr_t)SCARG(uap, addr); |
| 552 | size = (vsize_t)SCARG(uap, len); |
| 553 | |
| 554 | /* |
| 555 | * align the address to a page boundary and adjust the size accordingly. |
| 556 | */ |
| 557 | |
| 558 | pageoff = (addr & PAGE_MASK); |
| 559 | addr -= pageoff; |
| 560 | size += pageoff; |
| 561 | size = (vsize_t)round_page(size); |
| 562 | |
| 563 | if (size == 0) |
| 564 | return 0; |
| 565 | |
| 566 | map = &p->p_vmspace->vm_map; |
| 567 | |
| 568 | error = range_test(map, addr, size, false); |
| 569 | if (error) |
| 570 | return EINVAL; |
| 571 | |
| 572 | vm_map_lock(map); |
| 573 | #if 0 |
| 574 | /* |
| 575 | * interesting system call semantic: make sure entire range is |
| 576 | * allocated before allowing an unmap. |
| 577 | */ |
| 578 | if (!uvm_map_checkprot(map, addr, addr + size, VM_PROT_NONE)) { |
| 579 | vm_map_unlock(map); |
| 580 | return EINVAL; |
| 581 | } |
| 582 | #endif |
| 583 | uvm_unmap_remove(map, addr, addr + size, &dead_entries, 0); |
| 584 | vm_map_unlock(map); |
| 585 | if (dead_entries != NULL) |
| 586 | uvm_unmap_detach(dead_entries, 0); |
| 587 | return 0; |
| 588 | } |
| 589 | |
| 590 | /* |
| 591 | * sys_mprotect: the mprotect system call |
| 592 | */ |
| 593 | |
| 594 | int |
| 595 | sys_mprotect(struct lwp *l, const struct sys_mprotect_args *uap, |
| 596 | register_t *retval) |
| 597 | { |
| 598 | /* { |
| 599 | syscallarg(void *) addr; |
| 600 | syscallarg(size_t) len; |
| 601 | syscallarg(int) prot; |
| 602 | } */ |
| 603 | struct proc *p = l->l_proc; |
| 604 | vaddr_t addr; |
| 605 | vsize_t size, pageoff; |
| 606 | vm_prot_t prot; |
| 607 | int error; |
| 608 | |
| 609 | /* |
| 610 | * extract syscall args from uap |
| 611 | */ |
| 612 | |
| 613 | addr = (vaddr_t)SCARG(uap, addr); |
| 614 | size = (vsize_t)SCARG(uap, len); |
| 615 | prot = SCARG(uap, prot) & VM_PROT_ALL; |
| 616 | |
| 617 | /* |
| 618 | * align the address to a page boundary and adjust the size accordingly. |
| 619 | */ |
| 620 | |
| 621 | pageoff = (addr & PAGE_MASK); |
| 622 | addr -= pageoff; |
| 623 | size += pageoff; |
| 624 | size = round_page(size); |
| 625 | |
| 626 | error = range_test(&p->p_vmspace->vm_map, addr, size, false); |
| 627 | if (error) |
| 628 | return EINVAL; |
| 629 | |
| 630 | error = uvm_map_protect(&p->p_vmspace->vm_map, addr, addr + size, prot, |
| 631 | false); |
| 632 | return error; |
| 633 | } |
| 634 | |
| 635 | /* |
| 636 | * sys_minherit: the minherit system call |
| 637 | */ |
| 638 | |
| 639 | int |
| 640 | sys_minherit(struct lwp *l, const struct sys_minherit_args *uap, |
| 641 | register_t *retval) |
| 642 | { |
| 643 | /* { |
| 644 | syscallarg(void *) addr; |
| 645 | syscallarg(int) len; |
| 646 | syscallarg(int) inherit; |
| 647 | } */ |
| 648 | struct proc *p = l->l_proc; |
| 649 | vaddr_t addr; |
| 650 | vsize_t size, pageoff; |
| 651 | vm_inherit_t inherit; |
| 652 | int error; |
| 653 | |
| 654 | addr = (vaddr_t)SCARG(uap, addr); |
| 655 | size = (vsize_t)SCARG(uap, len); |
| 656 | inherit = SCARG(uap, inherit); |
| 657 | |
| 658 | /* |
| 659 | * align the address to a page boundary and adjust the size accordingly. |
| 660 | */ |
| 661 | |
| 662 | pageoff = (addr & PAGE_MASK); |
| 663 | addr -= pageoff; |
| 664 | size += pageoff; |
| 665 | size = (vsize_t)round_page(size); |
| 666 | |
| 667 | error = range_test(&p->p_vmspace->vm_map, addr, size, false); |
| 668 | if (error) |
| 669 | return EINVAL; |
| 670 | |
| 671 | error = uvm_map_inherit(&p->p_vmspace->vm_map, addr, addr + size, |
| 672 | inherit); |
| 673 | return error; |
| 674 | } |
| 675 | |
| 676 | /* |
| 677 | * sys_madvise: give advice about memory usage. |
| 678 | */ |
| 679 | |
| 680 | /* ARGSUSED */ |
| 681 | int |
| 682 | sys_madvise(struct lwp *l, const struct sys_madvise_args *uap, |
| 683 | register_t *retval) |
| 684 | { |
| 685 | /* { |
| 686 | syscallarg(void *) addr; |
| 687 | syscallarg(size_t) len; |
| 688 | syscallarg(int) behav; |
| 689 | } */ |
| 690 | struct proc *p = l->l_proc; |
| 691 | vaddr_t addr; |
| 692 | vsize_t size, pageoff; |
| 693 | int advice, error; |
| 694 | |
| 695 | addr = (vaddr_t)SCARG(uap, addr); |
| 696 | size = (vsize_t)SCARG(uap, len); |
| 697 | advice = SCARG(uap, behav); |
| 698 | |
| 699 | /* |
| 700 | * align the address to a page boundary, and adjust the size accordingly |
| 701 | */ |
| 702 | |
| 703 | pageoff = (addr & PAGE_MASK); |
| 704 | addr -= pageoff; |
| 705 | size += pageoff; |
| 706 | size = (vsize_t)round_page(size); |
| 707 | |
| 708 | error = range_test(&p->p_vmspace->vm_map, addr, size, false); |
| 709 | if (error) |
| 710 | return EINVAL; |
| 711 | |
| 712 | switch (advice) { |
| 713 | case MADV_NORMAL: |
| 714 | case MADV_RANDOM: |
| 715 | case MADV_SEQUENTIAL: |
| 716 | error = uvm_map_advice(&p->p_vmspace->vm_map, addr, addr + size, |
| 717 | advice); |
| 718 | break; |
| 719 | |
| 720 | case MADV_WILLNEED: |
| 721 | |
| 722 | /* |
| 723 | * Activate all these pages, pre-faulting them in if |
| 724 | * necessary. |
| 725 | */ |
| 726 | error = uvm_map_willneed(&p->p_vmspace->vm_map, |
| 727 | addr, addr + size); |
| 728 | break; |
| 729 | |
| 730 | case MADV_DONTNEED: |
| 731 | |
| 732 | /* |
| 733 | * Deactivate all these pages. We don't need them |
| 734 | * any more. We don't, however, toss the data in |
| 735 | * the pages. |
| 736 | */ |
| 737 | |
| 738 | error = uvm_map_clean(&p->p_vmspace->vm_map, addr, addr + size, |
| 739 | PGO_DEACTIVATE); |
| 740 | break; |
| 741 | |
| 742 | case MADV_FREE: |
| 743 | |
| 744 | /* |
| 745 | * These pages contain no valid data, and may be |
| 746 | * garbage-collected. Toss all resources, including |
| 747 | * any swap space in use. |
| 748 | */ |
| 749 | |
| 750 | error = uvm_map_clean(&p->p_vmspace->vm_map, addr, addr + size, |
| 751 | PGO_FREE); |
| 752 | break; |
| 753 | |
| 754 | case MADV_SPACEAVAIL: |
| 755 | |
| 756 | /* |
| 757 | * XXXMRG What is this? I think it's: |
| 758 | * |
| 759 | * Ensure that we have allocated backing-store |
| 760 | * for these pages. |
| 761 | * |
| 762 | * This is going to require changes to the page daemon, |
| 763 | * as it will free swap space allocated to pages in core. |
| 764 | * There's also what to do for device/file/anonymous memory. |
| 765 | */ |
| 766 | |
| 767 | return EINVAL; |
| 768 | |
| 769 | default: |
| 770 | return EINVAL; |
| 771 | } |
| 772 | |
| 773 | return error; |
| 774 | } |
| 775 | |
| 776 | /* |
| 777 | * sys_mlock: memory lock |
| 778 | */ |
| 779 | |
| 780 | int |
| 781 | sys_mlock(struct lwp *l, const struct sys_mlock_args *uap, register_t *retval) |
| 782 | { |
| 783 | /* { |
| 784 | syscallarg(const void *) addr; |
| 785 | syscallarg(size_t) len; |
| 786 | } */ |
| 787 | struct proc *p = l->l_proc; |
| 788 | vaddr_t addr; |
| 789 | vsize_t size, pageoff; |
| 790 | int error; |
| 791 | |
| 792 | /* |
| 793 | * extract syscall args from uap |
| 794 | */ |
| 795 | |
| 796 | addr = (vaddr_t)SCARG(uap, addr); |
| 797 | size = (vsize_t)SCARG(uap, len); |
| 798 | |
| 799 | /* |
| 800 | * align the address to a page boundary and adjust the size accordingly |
| 801 | */ |
| 802 | |
| 803 | pageoff = (addr & PAGE_MASK); |
| 804 | addr -= pageoff; |
| 805 | size += pageoff; |
| 806 | size = (vsize_t)round_page(size); |
| 807 | |
| 808 | error = range_test(&p->p_vmspace->vm_map, addr, size, false); |
| 809 | if (error) |
| 810 | return ENOMEM; |
| 811 | |
| 812 | if (atop(size) + uvmexp.wired > uvmexp.wiredmax) |
| 813 | return EAGAIN; |
| 814 | |
| 815 | if (size + ptoa(pmap_wired_count(vm_map_pmap(&p->p_vmspace->vm_map))) > |
| 816 | p->p_rlimit[RLIMIT_MEMLOCK].rlim_cur) |
| 817 | return EAGAIN; |
| 818 | |
| 819 | error = uvm_map_pageable(&p->p_vmspace->vm_map, addr, addr+size, false, |
| 820 | 0); |
| 821 | if (error == EFAULT) |
| 822 | error = ENOMEM; |
| 823 | return error; |
| 824 | } |
| 825 | |
| 826 | /* |
| 827 | * sys_munlock: unlock wired pages |
| 828 | */ |
| 829 | |
| 830 | int |
| 831 | sys_munlock(struct lwp *l, const struct sys_munlock_args *uap, |
| 832 | register_t *retval) |
| 833 | { |
| 834 | /* { |
| 835 | syscallarg(const void *) addr; |
| 836 | syscallarg(size_t) len; |
| 837 | } */ |
| 838 | struct proc *p = l->l_proc; |
| 839 | vaddr_t addr; |
| 840 | vsize_t size, pageoff; |
| 841 | int error; |
| 842 | |
| 843 | /* |
| 844 | * extract syscall args from uap |
| 845 | */ |
| 846 | |
| 847 | addr = (vaddr_t)SCARG(uap, addr); |
| 848 | size = (vsize_t)SCARG(uap, len); |
| 849 | |
| 850 | /* |
| 851 | * align the address to a page boundary, and adjust the size accordingly |
| 852 | */ |
| 853 | |
| 854 | pageoff = (addr & PAGE_MASK); |
| 855 | addr -= pageoff; |
| 856 | size += pageoff; |
| 857 | size = (vsize_t)round_page(size); |
| 858 | |
| 859 | error = range_test(&p->p_vmspace->vm_map, addr, size, false); |
| 860 | if (error) |
| 861 | return ENOMEM; |
| 862 | |
| 863 | error = uvm_map_pageable(&p->p_vmspace->vm_map, addr, addr+size, true, |
| 864 | 0); |
| 865 | if (error) |
| 866 | return ENOMEM; |
| 867 | |
| 868 | return 0; |
| 869 | } |
| 870 | |
| 871 | /* |
| 872 | * sys_mlockall: lock all pages mapped into an address space. |
| 873 | */ |
| 874 | |
| 875 | int |
| 876 | sys_mlockall(struct lwp *l, const struct sys_mlockall_args *uap, |
| 877 | register_t *retval) |
| 878 | { |
| 879 | /* { |
| 880 | syscallarg(int) flags; |
| 881 | } */ |
| 882 | struct proc *p = l->l_proc; |
| 883 | int error, flags; |
| 884 | |
| 885 | flags = SCARG(uap, flags); |
| 886 | |
| 887 | if (flags == 0 || (flags & ~(MCL_CURRENT|MCL_FUTURE)) != 0) |
| 888 | return EINVAL; |
| 889 | |
| 890 | error = uvm_map_pageable_all(&p->p_vmspace->vm_map, flags, |
| 891 | p->p_rlimit[RLIMIT_MEMLOCK].rlim_cur); |
| 892 | return error; |
| 893 | } |
| 894 | |
| 895 | /* |
| 896 | * sys_munlockall: unlock all pages mapped into an address space. |
| 897 | */ |
| 898 | |
| 899 | int |
| 900 | sys_munlockall(struct lwp *l, const void *v, register_t *retval) |
| 901 | { |
| 902 | struct proc *p = l->l_proc; |
| 903 | |
| 904 | (void) uvm_map_pageable_all(&p->p_vmspace->vm_map, 0, 0); |
| 905 | return 0; |
| 906 | } |
| 907 | |
| 908 | /* |
| 909 | * uvm_mmap: internal version of mmap |
| 910 | * |
| 911 | * - used by sys_mmap and various framebuffers |
| 912 | * - uobj is a struct uvm_object pointer or NULL for MAP_ANON |
| 913 | * - caller must page-align the file offset |
| 914 | */ |
| 915 | |
| 916 | int |
| 917 | uvm_mmap(struct vm_map *map, vaddr_t *addr, vsize_t size, vm_prot_t prot, |
| 918 | vm_prot_t maxprot, int flags, int advice, struct uvm_object *uobj, |
| 919 | voff_t foff, vsize_t locklimit) |
| 920 | { |
| 921 | vaddr_t align = 0; |
| 922 | int error; |
| 923 | uvm_flag_t uvmflag = 0; |
| 924 | |
| 925 | /* |
| 926 | * check params |
| 927 | */ |
| 928 | |
| 929 | if (size == 0) |
| 930 | return 0; |
| 931 | if (foff & PAGE_MASK) |
| 932 | return EINVAL; |
| 933 | if ((prot & maxprot) != prot) |
| 934 | return EINVAL; |
| 935 | |
| 936 | /* |
| 937 | * for non-fixed mappings, round off the suggested address. |
| 938 | * for fixed mappings, check alignment and zap old mappings. |
| 939 | */ |
| 940 | |
| 941 | if ((flags & MAP_FIXED) == 0) { |
| 942 | *addr = round_page(*addr); |
| 943 | } else { |
| 944 | if (*addr & PAGE_MASK) |
| 945 | return EINVAL; |
| 946 | uvmflag |= UVM_FLAG_FIXED; |
| 947 | (void) uvm_unmap(map, *addr, *addr + size); |
| 948 | } |
| 949 | |
| 950 | /* |
| 951 | * Try to see if any requested alignment can even be attemped. |
| 952 | * Make sure we can express the alignment (asking for a >= 4GB |
| 953 | * alignment on an ILP32 architecure make no sense) and the |
| 954 | * alignment is at least for a page sized quanitiy. If the |
| 955 | * request was for a fixed mapping, make sure supplied address |
| 956 | * adheres to the request alignment. |
| 957 | */ |
| 958 | align = (flags & MAP_ALIGNMENT_MASK) >> MAP_ALIGNMENT_SHIFT; |
| 959 | if (align) { |
| 960 | if (align >= sizeof(vaddr_t) * NBBY) |
| 961 | return EINVAL; |
| 962 | align = 1L << align; |
| 963 | if (align < PAGE_SIZE) |
| 964 | return EINVAL; |
| 965 | if (align >= vm_map_max(map)) |
| 966 | return ENOMEM; |
| 967 | if (flags & MAP_FIXED) { |
| 968 | if ((*addr & (align-1)) != 0) |
| 969 | return EINVAL; |
| 970 | align = 0; |
| 971 | } |
| 972 | } |
| 973 | |
| 974 | /* |
| 975 | * check resource limits |
| 976 | */ |
| 977 | |
| 978 | if (!VM_MAP_IS_KERNEL(map) && |
| 979 | (((rlim_t)curproc->p_vmspace->vm_map.size + (rlim_t)size) > |
| 980 | curproc->p_rlimit[RLIMIT_AS].rlim_cur)) |
| 981 | return ENOMEM; |
| 982 | |
| 983 | /* |
| 984 | * handle anon vs. non-anon mappings. for non-anon mappings attach |
| 985 | * to underlying vm object. |
| 986 | */ |
| 987 | |
| 988 | if (flags & MAP_ANON) { |
| 989 | KASSERT(uobj == NULL); |
| 990 | foff = UVM_UNKNOWN_OFFSET; |
| 991 | if ((flags & MAP_SHARED) == 0) |
| 992 | /* XXX: defer amap create */ |
| 993 | uvmflag |= UVM_FLAG_COPYONW; |
| 994 | else |
| 995 | /* shared: create amap now */ |
| 996 | uvmflag |= UVM_FLAG_OVERLAY; |
| 997 | |
| 998 | } else { |
| 999 | KASSERT(uobj != NULL); |
| 1000 | if ((flags & MAP_SHARED) == 0) { |
| 1001 | uvmflag |= UVM_FLAG_COPYONW; |
| 1002 | } |
| 1003 | } |
| 1004 | |
| 1005 | uvmflag = UVM_MAPFLAG(prot, maxprot, |
| 1006 | (flags & MAP_SHARED) ? UVM_INH_SHARE : UVM_INH_COPY, advice, |
| 1007 | uvmflag); |
| 1008 | error = uvm_map(map, addr, size, uobj, foff, align, uvmflag); |
| 1009 | if (error) { |
| 1010 | if (uobj) |
| 1011 | uobj->pgops->pgo_detach(uobj); |
| 1012 | return error; |
| 1013 | } |
| 1014 | |
| 1015 | /* |
| 1016 | * POSIX 1003.1b -- if our address space was configured |
| 1017 | * to lock all future mappings, wire the one we just made. |
| 1018 | * |
| 1019 | * Also handle the MAP_WIRED flag here. |
| 1020 | */ |
| 1021 | |
| 1022 | if (prot == VM_PROT_NONE) { |
| 1023 | |
| 1024 | /* |
| 1025 | * No more work to do in this case. |
| 1026 | */ |
| 1027 | |
| 1028 | return 0; |
| 1029 | } |
| 1030 | if ((flags & MAP_WIRED) != 0 || (map->flags & VM_MAP_WIREFUTURE) != 0) { |
| 1031 | vm_map_lock(map); |
| 1032 | if (atop(size) + uvmexp.wired > uvmexp.wiredmax || |
| 1033 | (locklimit != 0 && |
| 1034 | size + ptoa(pmap_wired_count(vm_map_pmap(map))) > |
| 1035 | locklimit)) { |
| 1036 | vm_map_unlock(map); |
| 1037 | uvm_unmap(map, *addr, *addr + size); |
| 1038 | return ENOMEM; |
| 1039 | } |
| 1040 | |
| 1041 | /* |
| 1042 | * uvm_map_pageable() always returns the map unlocked. |
| 1043 | */ |
| 1044 | |
| 1045 | error = uvm_map_pageable(map, *addr, *addr + size, |
| 1046 | false, UVM_LK_ENTER); |
| 1047 | if (error) { |
| 1048 | uvm_unmap(map, *addr, *addr + size); |
| 1049 | return error; |
| 1050 | } |
| 1051 | return 0; |
| 1052 | } |
| 1053 | return 0; |
| 1054 | } |
| 1055 | |
| 1056 | vaddr_t |
| 1057 | uvm_default_mapaddr(struct proc *p, vaddr_t base, vsize_t sz, int topdown) |
| 1058 | { |
| 1059 | |
| 1060 | if (topdown) |
| 1061 | return VM_DEFAULT_ADDRESS_TOPDOWN(base, sz); |
| 1062 | else |
| 1063 | return VM_DEFAULT_ADDRESS_BOTTOMUP(base, sz); |
| 1064 | } |
| 1065 | |
| 1066 | int |
| 1067 | uvm_mmap_dev(struct proc *p, void **addrp, size_t len, dev_t dev, |
| 1068 | off_t off) |
| 1069 | { |
| 1070 | struct uvm_object *uobj; |
| 1071 | int error, flags, prot; |
| 1072 | |
| 1073 | flags = MAP_SHARED; |
| 1074 | prot = VM_PROT_READ | VM_PROT_WRITE; |
| 1075 | if (*addrp) |
| 1076 | flags |= MAP_FIXED; |
| 1077 | else |
| 1078 | *addrp = (void *)p->p_emul->e_vm_default_addr(p, |
| 1079 | (vaddr_t)p->p_vmspace->vm_daddr, len, |
| 1080 | p->p_vmspace->vm_map.flags & VM_MAP_TOPDOWN); |
| 1081 | |
| 1082 | uobj = udv_attach(dev, prot, off, len); |
| 1083 | if (uobj == NULL) |
| 1084 | return EINVAL; |
| 1085 | |
| 1086 | error = uvm_mmap(&p->p_vmspace->vm_map, (vaddr_t *)addrp, |
| 1087 | (vsize_t)len, prot, prot, flags, UVM_ADV_RANDOM, uobj, off, |
| 1088 | p->p_rlimit[RLIMIT_MEMLOCK].rlim_cur); |
| 1089 | return error; |
| 1090 | } |
| 1091 | |
| 1092 | int |
| 1093 | uvm_mmap_anon(struct proc *p, void **addrp, size_t len) |
| 1094 | { |
| 1095 | int error, flags, prot; |
| 1096 | |
| 1097 | flags = MAP_PRIVATE | MAP_ANON; |
| 1098 | prot = VM_PROT_READ | VM_PROT_WRITE; |
| 1099 | if (*addrp) |
| 1100 | flags |= MAP_FIXED; |
| 1101 | else |
| 1102 | *addrp = (void *)p->p_emul->e_vm_default_addr(p, |
| 1103 | (vaddr_t)p->p_vmspace->vm_daddr, len, |
| 1104 | p->p_vmspace->vm_map.flags & VM_MAP_TOPDOWN); |
| 1105 | |
| 1106 | error = uvm_mmap(&p->p_vmspace->vm_map, (vaddr_t *)addrp, |
| 1107 | (vsize_t)len, prot, prot, flags, UVM_ADV_NORMAL, NULL, 0, |
| 1108 | p->p_rlimit[RLIMIT_MEMLOCK].rlim_cur); |
| 1109 | return error; |
| 1110 | } |
| 1111 | |