1 /*-
2 * SPDX-License-Identifier: BSD-3-Clause
3 *
4 * Copyright (c) 1993 Jan-Simon Pendry
5 * Copyright (c) 1993
6 * The Regents of the University of California. All rights reserved.
7 *
8 * This code is derived from software contributed to Berkeley by
9 * Jan-Simon Pendry.
10 *
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
13 * are met:
14 * 1. Redistributions of source code must retain the above copyright
15 * notice, this list of conditions and the following disclaimer.
16 * 2. Redistributions in binary form must reproduce the above copyright
17 * notice, this list of conditions and the following disclaimer in the
18 * documentation and/or other materials provided with the distribution.
19 * 3. Neither the name of the University nor the names of its contributors
20 * may be used to endorse or promote products derived from this software
21 * without specific prior written permission.
22 *
23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33 * SUCH DAMAGE.
34 *
35 * @(#)procfs_status.c 8.3 (Berkeley) 2/17/94
36 *
37 * $FreeBSD$
38 */
39
40 #include <sys/param.h>
41 #include <sys/systm.h>
42 #include <sys/lock.h>
43 #include <sys/filedesc.h>
44 #include <sys/malloc.h>
45 #include <sys/mount.h>
46 #include <sys/proc.h>
47 #include <sys/resourcevar.h>
48 #include <sys/rwlock.h>
49 #include <sys/sbuf.h>
50 #ifdef COMPAT_FREEBSD32
51 #include <sys/sysent.h>
52 #endif
53 #include <sys/uio.h>
54 #include <sys/vnode.h>
55
56 #include <fs/pseudofs/pseudofs.h>
57 #include <fs/procfs/procfs.h>
58
59 #include <vm/vm.h>
60 #include <vm/vm_extern.h>
61 #include <vm/pmap.h>
62 #include <vm/vm_map.h>
63 #include <vm/vm_page.h>
64 #include <vm/vm_object.h>
65
66 #define MEBUFFERSIZE 256
67
68 /*
69 * The map entries can *almost* be read with programs like cat. However,
70 * large maps need special programs to read. It is not easy to implement
71 * a program that can sense the required size of the buffer, and then
72 * subsequently do a read with the appropriate size. This operation cannot
73 * be atomic. The best that we can do is to allow the program to do a read
74 * with an arbitrarily large buffer, and return as much as we can. We can
75 * return an error code if the buffer is too small (EFBIG), then the program
76 * can try a bigger buffer.
77 */
78 int
79 procfs_doprocmap(PFS_FILL_ARGS)
80 {
81 struct vmspace *vm;
82 vm_map_t map;
83 vm_map_entry_t entry, tmp_entry;
84 struct vnode *vp;
85 char *fullpath, *freepath, *type;
86 struct ucred *cred;
87 vm_object_t obj, tobj, lobj;
88 int error, privateresident, ref_count, resident, shadow_count, flags;
89 vm_offset_t e_start, e_end;
90 vm_eflags_t e_eflags;
91 vm_prot_t e_prot;
92 unsigned int last_timestamp;
93 bool super;
94 #ifdef COMPAT_FREEBSD32
95 bool wrap32;
96 #endif
97
98 PROC_LOCK(p);
99 error = p_candebug(td, p);
100 PROC_UNLOCK(p);
101 if (error)
102 return (error);
103
104 if (uio->uio_rw != UIO_READ)
105 return (EOPNOTSUPP);
106
107 #ifdef COMPAT_FREEBSD32
108 wrap32 = false;
109 if (SV_CURPROC_FLAG(SV_ILP32)) {
110 if (!(SV_PROC_FLAG(p, SV_ILP32)))
111 return (EOPNOTSUPP);
112 wrap32 = true;
113 }
114 #endif
115
116 vm = vmspace_acquire_ref(p);
117 if (vm == NULL)
118 return (ESRCH);
119 map = &vm->vm_map;
120 vm_map_lock_read(map);
121 for (entry = map->header.next; entry != &map->header;
122 entry = entry->next) {
123 if (entry->eflags & MAP_ENTRY_IS_SUB_MAP)
124 continue;
125
126 e_eflags = entry->eflags;
127 e_prot = entry->protection;
128 e_start = entry->start;
129 e_end = entry->end;
130 privateresident = 0;
131 resident = 0;
132 obj = entry->object.vm_object;
133 if (obj != NULL) {
134 VM_OBJECT_RLOCK(obj);
135 if (obj->shadow_count == 1)
136 privateresident = obj->resident_page_count;
137 }
138 cred = (entry->cred) ? entry->cred : (obj ? obj->cred : NULL);
139
140 for (lobj = tobj = obj; tobj != NULL;
141 tobj = tobj->backing_object) {
142 if (tobj != obj)
143 VM_OBJECT_RLOCK(tobj);
144 lobj = tobj;
145 }
146 if (obj != NULL)
147 kern_proc_vmmap_resident(map, entry, &resident, &super);
148 for (tobj = obj; tobj != NULL; tobj = tobj->backing_object) {
149 if (tobj != obj && tobj != lobj)
150 VM_OBJECT_RUNLOCK(tobj);
151 }
152 last_timestamp = map->timestamp;
153 vm_map_unlock_read(map);
154
155 freepath = NULL;
156 fullpath = "-";
157 if (lobj) {
158 vp = NULL;
159 switch (lobj->type) {
160 default:
161 case OBJT_DEFAULT:
162 type = "default";
163 break;
164 case OBJT_VNODE:
165 type = "vnode";
166 vp = lobj->handle;
167 vref(vp);
168 break;
169 case OBJT_SWAP:
170 if ((lobj->flags & OBJ_TMPFS_NODE) != 0) {
171 type = "vnode";
172 if ((lobj->flags & OBJ_TMPFS) != 0) {
173 vp = lobj->un_pager.swp.swp_tmpfs;
174 vref(vp);
175 }
176 } else {
177 type = "swap";
178 }
179 break;
180 case OBJT_SG:
181 case OBJT_DEVICE:
182 type = "device";
183 break;
184 }
185 if (lobj != obj)
186 VM_OBJECT_RUNLOCK(lobj);
187
188 flags = obj->flags;
189 ref_count = obj->ref_count;
190 shadow_count = obj->shadow_count;
191 VM_OBJECT_RUNLOCK(obj);
192 if (vp != NULL) {
193 vn_fullpath(td, vp, &fullpath, &freepath);
194 vrele(vp);
195 }
196 } else {
197 type = "none";
198 flags = 0;
199 ref_count = 0;
200 shadow_count = 0;
201 }
202
203 /*
204 * format:
205 * start, end, resident, private resident, cow, access, type,
206 * charged, charged uid.
207 */
208 error = sbuf_printf(sb,
209 "0x%lx 0x%lx %d %d %p %s%s%s %d %d 0x%x %s %s %s %s %s %d\n",
210 (u_long)e_start, (u_long)e_end,
211 resident, privateresident,
212 #ifdef COMPAT_FREEBSD32
213 wrap32 ? NULL : obj, /* Hide 64 bit value */
214 #else
215 obj,
216 #endif
217 (e_prot & VM_PROT_READ)?"r":"-",
218 (e_prot & VM_PROT_WRITE)?"w":"-",
219 (e_prot & VM_PROT_EXECUTE)?"x":"-",
220 ref_count, shadow_count, flags,
221 (e_eflags & MAP_ENTRY_COW)?"COW":"NCOW",
222 (e_eflags & MAP_ENTRY_NEEDS_COPY)?"NC":"NNC",
223 type, fullpath,
224 cred ? "CH":"NCH", cred ? cred->cr_ruid : -1);
225
226 if (freepath != NULL)
227 free(freepath, M_TEMP);
228 vm_map_lock_read(map);
229 if (error == -1) {
230 error = 0;
231 break;
232 }
233 if (last_timestamp != map->timestamp) {
234 /*
235 * Look again for the entry because the map was
236 * modified while it was unlocked. Specifically,
237 * the entry may have been clipped, merged, or deleted.
238 */
239 vm_map_lookup_entry(map, e_end - 1, &tmp_entry);
240 entry = tmp_entry;
241 }
242 }
243 vm_map_unlock_read(map);
244 vmspace_free(vm);
245 return (error);
246 }
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