1 /*-
2 * SPDX-License-Identifier: BSD-4-Clause
3 *
4 * Copyright (c) 2001 Dag-Erling Smørgrav
5 * Copyright (c) 1993 Jan-Simon Pendry
6 * Copyright (c) 1993
7 * The Regents of the University of California. All rights reserved.
8 *
9 * This code is derived from software contributed to Berkeley by
10 * Jan-Simon Pendry.
11 *
12 * Redistribution and use in source and binary forms, with or without
13 * modification, are permitted provided that the following conditions
14 * are met:
15 * 1. Redistributions of source code must retain the above copyright
16 * notice, this list of conditions and the following disclaimer.
17 * 2. Redistributions in binary form must reproduce the above copyright
18 * notice, this list of conditions and the following disclaimer in the
19 * documentation and/or other materials provided with the distribution.
20 * 3. All advertising materials mentioning features or use of this software
21 * must display the following acknowledgement:
22 * This product includes software developed by the University of
23 * California, Berkeley and its contributors.
24 * 4. Neither the name of the University nor the names of its contributors
25 * may be used to endorse or promote products derived from this software
26 * without specific prior written permission.
27 *
28 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
29 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
30 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
31 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
32 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
33 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
34 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
35 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
36 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
37 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
38 * SUCH DAMAGE.
39 *
40 * @(#)procfs_vfsops.c 8.7 (Berkeley) 5/10/95
41 */
42
43 #include <sys/param.h>
44 #include <sys/queue.h>
45 #include <sys/exec.h>
46 #include <sys/lock.h>
47 #include <sys/kernel.h>
48 #include <sys/malloc.h>
49 #include <sys/mount.h>
50 #include <sys/mutex.h>
51 #include <sys/proc.h>
52 #include <sys/sbuf.h>
53 #include <sys/sysproto.h>
54 #include <sys/systm.h>
55 #include <sys/vnode.h>
56
57 #include <vm/vm.h>
58 #include <vm/pmap.h>
59 #include <vm/vm_param.h>
60
61 #include <fs/pseudofs/pseudofs.h>
62 #include <fs/procfs/procfs.h>
63
64 /*
65 * Filler function for proc/pid/file
66 */
67 int
procfs_doprocfile(PFS_FILL_ARGS)68 procfs_doprocfile(PFS_FILL_ARGS)
69 {
70 char *fullpath, *freepath, *binpath;
71 int error;
72
73 freepath = NULL;
74 binpath = malloc(MAXPATHLEN, M_TEMP, M_WAITOK);
75 PROC_LOCK(p);
76 error = proc_get_binpath(p, binpath, &fullpath, &freepath);
77 if (error == 0)
78 sbuf_cat(sb, fullpath);
79 free(binpath, M_TEMP);
80 free(freepath, M_TEMP);
81 return (error);
82 }
83
84 /*
85 * Filler function for proc/curproc
86 */
87 int
procfs_docurproc(PFS_FILL_ARGS)88 procfs_docurproc(PFS_FILL_ARGS)
89 {
90 sbuf_printf(sb, "%ld", (long)td->td_proc->p_pid);
91 return (0);
92 }
93
94 static int
procfs_attr(PFS_ATTR_ARGS,int mode)95 procfs_attr(PFS_ATTR_ARGS, int mode) {
96 vap->va_mode = mode;
97 if (p != NULL) {
98 PROC_LOCK_ASSERT(p, MA_OWNED);
99
100 if ((p->p_flag & P_SUGID) && pn->pn_type != pfstype_procdir)
101 vap->va_mode = 0;
102 }
103
104 return (0);
105 }
106
107 int
procfs_attr_all_rx(PFS_ATTR_ARGS)108 procfs_attr_all_rx(PFS_ATTR_ARGS)
109 {
110
111 return (procfs_attr(td, p, pn, vap, 0555));
112 }
113
114 int
procfs_attr_rw(PFS_ATTR_ARGS)115 procfs_attr_rw(PFS_ATTR_ARGS)
116 {
117
118 return (procfs_attr(td, p, pn, vap, 0600));
119 }
120
121 int
procfs_attr_w(PFS_ATTR_ARGS)122 procfs_attr_w(PFS_ATTR_ARGS)
123 {
124
125 return (procfs_attr(td, p, pn, vap, 0200));
126 }
127
128 /*
129 * Visibility: some files only exist for non-system processes
130 * Non-static because linprocfs uses it.
131 */
132 int
procfs_notsystem(PFS_VIS_ARGS)133 procfs_notsystem(PFS_VIS_ARGS)
134 {
135 PROC_LOCK_ASSERT(p, MA_OWNED);
136 return ((p->p_flag & P_SYSTEM) == 0);
137 }
138
139 /*
140 * Visibility: some files are only visible to process that can debug
141 * the target process.
142 */
143 int
procfs_candebug(PFS_VIS_ARGS)144 procfs_candebug(PFS_VIS_ARGS)
145 {
146 PROC_LOCK_ASSERT(p, MA_OWNED);
147 return ((p->p_flag & P_SYSTEM) == 0 && p_candebug(td, p) == 0);
148 }
149
150 /*
151 * Constructor
152 */
153 static int
procfs_init(PFS_INIT_ARGS)154 procfs_init(PFS_INIT_ARGS)
155 {
156 struct pfs_node *root;
157 struct pfs_node *dir;
158
159 root = pi->pi_root;
160
161 pfs_create_link(root, "curproc", procfs_docurproc,
162 NULL, NULL, NULL, 0);
163
164 dir = pfs_create_dir(root, "pid",
165 procfs_attr_all_rx, NULL, NULL, PFS_PROCDEP);
166 pfs_create_file(dir, "cmdline", procfs_doproccmdline,
167 NULL, NULL, NULL, PFS_RD);
168 pfs_create_file(dir, "dbregs", procfs_doprocdbregs,
169 procfs_attr_rw, procfs_candebug, NULL, PFS_RDWR | PFS_RAW);
170 pfs_create_file(dir, "etype", procfs_doproctype,
171 NULL, NULL, NULL, PFS_RD);
172 pfs_create_file(dir, "fpregs", procfs_doprocfpregs,
173 procfs_attr_rw, procfs_candebug, NULL, PFS_RDWR | PFS_RAW);
174 pfs_create_file(dir, "map", procfs_doprocmap,
175 NULL, procfs_notsystem, NULL, PFS_RD);
176 pfs_create_file(dir, "mem", procfs_doprocmem,
177 procfs_attr_rw, procfs_candebug, NULL, PFS_RDWR | PFS_RAW);
178 pfs_create_file(dir, "note", procfs_doprocnote,
179 procfs_attr_w, procfs_candebug, NULL, PFS_WR);
180 pfs_create_file(dir, "notepg", procfs_doprocnote,
181 procfs_attr_w, procfs_candebug, NULL, PFS_WR);
182 pfs_create_file(dir, "regs", procfs_doprocregs,
183 procfs_attr_rw, procfs_candebug, NULL, PFS_RDWR | PFS_RAW);
184 pfs_create_file(dir, "rlimit", procfs_doprocrlimit,
185 NULL, NULL, NULL, PFS_RD);
186 pfs_create_file(dir, "status", procfs_doprocstatus,
187 NULL, NULL, NULL, PFS_RD);
188 pfs_create_file(dir, "osrel", procfs_doosrel,
189 procfs_attr_rw, procfs_candebug, NULL, PFS_RDWR);
190
191 pfs_create_link(dir, "file", procfs_doprocfile,
192 NULL, procfs_notsystem, NULL, 0);
193
194 return (0);
195 }
196
197 /*
198 * Destructor
199 */
200 static int
procfs_uninit(PFS_INIT_ARGS)201 procfs_uninit(PFS_INIT_ARGS)
202 {
203 /* nothing to do, pseudofs will GC */
204 return (0);
205 }
206
207 PSEUDOFS(procfs, 1, VFCF_JAIL);
208