1/*- 2 * Copyright (c) 1988 University of Utah. 3 * Copyright (c) 1991, 1993 4 * The Regents of the University of California. All rights reserved. 5 * 6 * This code is derived from software contributed to Berkeley by 7 * the Systems Programming Group of the University of Utah Computer 8 * Science Department. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 4. Neither the name of the University nor the names of its contributors 19 * may be used to endorse or promote products derived from this software 20 * without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 * 34 * from: Utah $Hdr: vm_unix.c 1.1 89/11/07$ 35 * 36 * @(#)vm_unix.c 8.1 (Berkeley) 6/11/93 37 */ 38 39#include "opt_compat.h" 40 41/* 42 * Traditional sbrk/grow interface to VM 43 */ 44 45#include <sys/cdefs.h> 46__FBSDID("$FreeBSD: stable/11/sys/vm/vm_unix.c 341467 2018-12-04 15:04:48Z emaste $"); 47 48#include <sys/param.h> 49#include <sys/lock.h> 50#include <sys/mutex.h> 51#include <sys/proc.h> 52#include <sys/racct.h> 53#include <sys/resourcevar.h> 54#include <sys/sysent.h> 55#include <sys/sysproto.h> 56#include <sys/systm.h> 57 58#include <vm/vm.h> 59#include <vm/vm_param.h> 60#include <vm/pmap.h> 61#include <vm/vm_map.h> 62 63#ifndef _SYS_SYSPROTO_H_ 64struct obreak_args { 65 char *nsize; 66}; 67#endif 68 69/* 70 * MPSAFE 71 */ 72/* ARGSUSED */ 73int 74sys_obreak(struct thread *td, struct obreak_args *uap) 75{ 76 struct vmspace *vm = td->td_proc->p_vmspace; 77 vm_map_t map = &vm->vm_map; 78 vm_offset_t new, old, base; 79 rlim_t datalim, lmemlim, vmemlim; 80 int prot, rv; 81 int error = 0; 82 boolean_t do_map_wirefuture; 83 84 datalim = lim_cur(td, RLIMIT_DATA); 85 lmemlim = lim_cur(td, RLIMIT_MEMLOCK); 86 vmemlim = lim_cur(td, RLIMIT_VMEM); 87 88 do_map_wirefuture = FALSE; 89 new = round_page((vm_offset_t)uap->nsize); 90 vm_map_lock(map); 91 92 base = round_page((vm_offset_t) vm->vm_daddr); 93 old = base + ctob(vm->vm_dsize); 94 if (new > base) { 95 /* 96 * Check the resource limit, but allow a process to reduce 97 * its usage, even if it remains over the limit. 98 */ 99 if (new - base > datalim && new > old) { 100 error = ENOMEM; 101 goto done; 102 } 103 if (new > vm_map_max(map)) { 104 error = ENOMEM; 105 goto done; 106 } 107 } else if (new < base) { 108 /* 109 * This is simply an invalid value. If someone wants to 110 * do fancy address space manipulations, mmap and munmap 111 * can do most of what the user would want. 112 */ 113 error = EINVAL; 114 goto done; 115 } 116 if (new > old) { 117 if (!old_mlock && map->flags & MAP_WIREFUTURE) { 118 if (ptoa(pmap_wired_count(map->pmap)) + 119 (new - old) > lmemlim) { 120 error = ENOMEM; 121 goto done; 122 } 123 } 124 if (map->size + (new - old) > vmemlim) { 125 error = ENOMEM; 126 goto done; 127 } 128#ifdef RACCT 129 if (racct_enable) { 130 PROC_LOCK(td->td_proc); 131 error = racct_set(td->td_proc, RACCT_DATA, new - base); 132 if (error != 0) { 133 PROC_UNLOCK(td->td_proc); 134 error = ENOMEM; 135 goto done; 136 } 137 error = racct_set(td->td_proc, RACCT_VMEM, 138 map->size + (new - old)); 139 if (error != 0) { 140 racct_set_force(td->td_proc, RACCT_DATA, 141 old - base); 142 PROC_UNLOCK(td->td_proc); 143 error = ENOMEM; 144 goto done; 145 } 146 if (!old_mlock && map->flags & MAP_WIREFUTURE) { 147 error = racct_set(td->td_proc, RACCT_MEMLOCK, 148 ptoa(pmap_wired_count(map->pmap)) + 149 (new - old)); 150 if (error != 0) { 151 racct_set_force(td->td_proc, RACCT_DATA, 152 old - base); 153 racct_set_force(td->td_proc, RACCT_VMEM, 154 map->size); 155 PROC_UNLOCK(td->td_proc); 156 error = ENOMEM; 157 goto done; 158 } 159 } 160 PROC_UNLOCK(td->td_proc); 161 } 162#endif 163 prot = VM_PROT_RW; 164#ifdef COMPAT_FREEBSD32 165#if defined(__amd64__) 166 if (i386_read_exec && SV_PROC_FLAG(td->td_proc, SV_ILP32)) 167 prot |= VM_PROT_EXECUTE; 168#endif 169#endif 170 rv = vm_map_insert(map, NULL, 0, old, new, prot, VM_PROT_ALL, 0); 171 if (rv != KERN_SUCCESS) { 172#ifdef RACCT 173 if (racct_enable) { 174 PROC_LOCK(td->td_proc); 175 racct_set_force(td->td_proc, 176 RACCT_DATA, old - base); 177 racct_set_force(td->td_proc, 178 RACCT_VMEM, map->size); 179 if (!old_mlock && map->flags & MAP_WIREFUTURE) { 180 racct_set_force(td->td_proc, 181 RACCT_MEMLOCK, 182 ptoa(pmap_wired_count(map->pmap))); 183 } 184 PROC_UNLOCK(td->td_proc); 185 } 186#endif 187 error = ENOMEM; 188 goto done; 189 } 190 vm->vm_dsize += btoc(new - old); 191 /* 192 * Handle the MAP_WIREFUTURE case for legacy applications, 193 * by marking the newly mapped range of pages as wired. 194 * We are not required to perform a corresponding 195 * vm_map_unwire() before vm_map_delete() below, as 196 * it will forcibly unwire the pages in the range. 197 * 198 * XXX If the pages cannot be wired, no error is returned. 199 */ 200 if ((map->flags & MAP_WIREFUTURE) == MAP_WIREFUTURE) { 201 if (bootverbose) 202 printf("obreak: MAP_WIREFUTURE set\n"); 203 do_map_wirefuture = TRUE; 204 } 205 } else if (new < old) { 206 rv = vm_map_delete(map, new, old); 207 if (rv != KERN_SUCCESS) { 208 error = ENOMEM; 209 goto done; 210 } 211 vm->vm_dsize -= btoc(old - new); 212#ifdef RACCT 213 if (racct_enable) { 214 PROC_LOCK(td->td_proc); 215 racct_set_force(td->td_proc, RACCT_DATA, new - base); 216 racct_set_force(td->td_proc, RACCT_VMEM, map->size); 217 if (!old_mlock && map->flags & MAP_WIREFUTURE) { 218 racct_set_force(td->td_proc, RACCT_MEMLOCK, 219 ptoa(pmap_wired_count(map->pmap))); 220 } 221 PROC_UNLOCK(td->td_proc); 222 } 223#endif 224 } 225done: 226 vm_map_unlock(map); 227 228 if (do_map_wirefuture) 229 (void) vm_map_wire(map, old, new, 230 VM_MAP_WIRE_USER|VM_MAP_WIRE_NOHOLES); 231 232 return (error); 233} 234 235#ifndef _SYS_SYSPROTO_H_ 236struct ovadvise_args { 237 int anom; 238}; 239#endif 240 241/* 242 * MPSAFE 243 */ 244/* ARGSUSED */ 245int 246sys_ovadvise(struct thread *td, struct ovadvise_args *uap) 247{ 248 /* START_GIANT_OPTIONAL */ 249 /* END_GIANT_OPTIONAL */ 250 return (EINVAL); 251} 252