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
41 #include <sys/param.h>
42 #include <sys/queue.h>
43 #include <sys/exec.h>
44 #include <sys/lock.h>
45 #include <sys/kernel.h>
46 #include <sys/malloc.h>
47 #include <sys/mount.h>
48 #include <sys/mutex.h>
49 #include <sys/proc.h>
50 #include <sys/sbuf.h>
51 #include <sys/sysproto.h>
52 #include <sys/systm.h>
53 #include <sys/vnode.h>
54
55 #include <vm/vm.h>
56 #include <vm/pmap.h>
57 #include <vm/vm_param.h>
58
59 #include <fs/pseudofs/pseudofs.h>
60 #include <fs/procfs/procfs.h>
61
62 /*
63 * Filler function for proc/pid/file
64 */
65 int
procfs_doprocfile(PFS_FILL_ARGS)66 procfs_doprocfile(PFS_FILL_ARGS)
67 {
68 char *fullpath, *freepath, *binpath;
69 int error;
70
71 freepath = NULL;
72 binpath = malloc(MAXPATHLEN, M_TEMP, M_WAITOK);
73 PROC_LOCK(p);
74 error = proc_get_binpath(p, binpath, &fullpath, &freepath);
75 if (error == 0)
76 sbuf_cat(sb, fullpath);
77 free(binpath, M_TEMP);
78 free(freepath, M_TEMP);
79 return (error);
80 }
81
82 /*
83 * Filler function for proc/curproc
84 */
85 int
procfs_docurproc(PFS_FILL_ARGS)86 procfs_docurproc(PFS_FILL_ARGS)
87 {
88 sbuf_printf(sb, "%ld", (long)td->td_proc->p_pid);
89 return (0);
90 }
91
92 static int
procfs_attr(PFS_ATTR_ARGS,int mode)93 procfs_attr(PFS_ATTR_ARGS, int mode) {
94 vap->va_mode = mode;
95 if (p != NULL) {
96 PROC_LOCK_ASSERT(p, MA_OWNED);
97
98 if ((p->p_flag & P_SUGID) && pn->pn_type != pfstype_procdir)
99 vap->va_mode = 0;
100 }
101
102 return (0);
103 }
104
105 int
procfs_attr_all_rx(PFS_ATTR_ARGS)106 procfs_attr_all_rx(PFS_ATTR_ARGS)
107 {
108
109 return (procfs_attr(td, p, pn, vap, 0555));
110 }
111
112 int
procfs_attr_rw(PFS_ATTR_ARGS)113 procfs_attr_rw(PFS_ATTR_ARGS)
114 {
115
116 return (procfs_attr(td, p, pn, vap, 0600));
117 }
118
119 int
procfs_attr_w(PFS_ATTR_ARGS)120 procfs_attr_w(PFS_ATTR_ARGS)
121 {
122
123 return (procfs_attr(td, p, pn, vap, 0200));
124 }
125
126 /*
127 * Visibility: some files only exist for non-system processes
128 * Non-static because linprocfs uses it.
129 */
130 int
procfs_notsystem(PFS_VIS_ARGS)131 procfs_notsystem(PFS_VIS_ARGS)
132 {
133 PROC_LOCK_ASSERT(p, MA_OWNED);
134 return ((p->p_flag & P_SYSTEM) == 0);
135 }
136
137 /*
138 * Visibility: some files are only visible to process that can debug
139 * the target process.
140 */
141 int
procfs_candebug(PFS_VIS_ARGS)142 procfs_candebug(PFS_VIS_ARGS)
143 {
144 PROC_LOCK_ASSERT(p, MA_OWNED);
145 return ((p->p_flag & P_SYSTEM) == 0 && p_candebug(td, p) == 0);
146 }
147
148 /*
149 * Constructor
150 */
151 static int
procfs_init(PFS_INIT_ARGS)152 procfs_init(PFS_INIT_ARGS)
153 {
154 struct pfs_node *root;
155 struct pfs_node *dir;
156
157 root = pi->pi_root;
158
159 pfs_create_link(root, "curproc", procfs_docurproc,
160 NULL, NULL, NULL, 0);
161 pfs_create_link(root, "self", 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 pfs_create_link(dir, "exe", procfs_doprocfile,
194 NULL, procfs_notsystem, NULL, 0);
195
196 return (0);
197 }
198
199 /*
200 * Destructor
201 */
202 static int
procfs_uninit(PFS_INIT_ARGS)203 procfs_uninit(PFS_INIT_ARGS)
204 {
205 /* nothing to do, pseudofs will GC */
206 return (0);
207 }
208
209 PSEUDOFS(procfs, 1, VFCF_JAIL);
210