1/*-
2 * SPDX-License-Identifier: BSD-4-Clause
3 *
4 * Copyright (c) 2001 Dag-Erling Sm��rgrav
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 * $FreeBSD$
43 */
44
45#include <sys/param.h>
46#include <sys/queue.h>
47#include <sys/exec.h>
48#include <sys/lock.h>
49#include <sys/kernel.h>
50#include <sys/malloc.h>
51#include <sys/mount.h>
52#include <sys/mutex.h>
53#include <sys/proc.h>
54#include <sys/sbuf.h>
55#include <sys/sysproto.h>
56#include <sys/systm.h>
57#include <sys/vnode.h>
58
59#include <vm/vm.h>
60#include <vm/pmap.h>
61#include <vm/vm_param.h>
62
63#include <fs/pseudofs/pseudofs.h>
64#include <fs/procfs/procfs.h>
65
66/*
67 * Filler function for proc/pid/file
68 */
69int
70procfs_doprocfile(PFS_FILL_ARGS)
71{
72	char *fullpath;
73	char *freepath;
74	struct vnode *textvp;
75	int error;
76
77	freepath = NULL;
78	PROC_LOCK(p);
79	textvp = p->p_textvp;
80	vhold(textvp);
81	PROC_UNLOCK(p);
82	error = vn_fullpath(textvp, &fullpath, &freepath);
83	vdrop(textvp);
84	if (error == 0)
85		sbuf_printf(sb, "%s", fullpath);
86	if (freepath != NULL)
87		free(freepath, M_TEMP);
88	return (error);
89}
90
91/*
92 * Filler function for proc/curproc
93 */
94int
95procfs_docurproc(PFS_FILL_ARGS)
96{
97	sbuf_printf(sb, "%ld", (long)td->td_proc->p_pid);
98	return (0);
99}
100
101static int
102procfs_attr(PFS_ATTR_ARGS, int mode) {
103	vap->va_mode = mode;
104	if (p != NULL) {
105		PROC_LOCK_ASSERT(p, MA_OWNED);
106
107		if ((p->p_flag & P_SUGID) && pn->pn_type != pfstype_procdir)
108			vap->va_mode = 0;
109	}
110
111	return (0);
112}
113
114int
115procfs_attr_all_rx(PFS_ATTR_ARGS)
116{
117
118	return (procfs_attr(td, p, pn, vap, 0555));
119}
120
121int
122procfs_attr_rw(PFS_ATTR_ARGS)
123{
124
125	return (procfs_attr(td, p, pn, vap, 0600));
126}
127
128int
129procfs_attr_w(PFS_ATTR_ARGS)
130{
131
132	return (procfs_attr(td, p, pn, vap, 0200));
133}
134
135/*
136 * Visibility: some files only exist for non-system processes
137 * Non-static because linprocfs uses it.
138 */
139int
140procfs_notsystem(PFS_VIS_ARGS)
141{
142	PROC_LOCK_ASSERT(p, MA_OWNED);
143	return ((p->p_flag & P_SYSTEM) == 0);
144}
145
146/*
147 * Visibility: some files are only visible to process that can debug
148 * the target process.
149 */
150int
151procfs_candebug(PFS_VIS_ARGS)
152{
153	PROC_LOCK_ASSERT(p, MA_OWNED);
154	return ((p->p_flag & P_SYSTEM) == 0 && p_candebug(td, p) == 0);
155}
156
157/*
158 * Constructor
159 */
160static int
161procfs_init(PFS_INIT_ARGS)
162{
163	struct pfs_node *root;
164	struct pfs_node *dir;
165
166	root = pi->pi_root;
167
168	pfs_create_link(root, "curproc", procfs_docurproc,
169	    NULL, NULL, NULL, 0);
170
171	dir = pfs_create_dir(root, "pid",
172	    procfs_attr_all_rx, NULL, NULL, PFS_PROCDEP);
173	pfs_create_file(dir, "cmdline", procfs_doproccmdline,
174	    NULL, NULL, NULL, PFS_RD);
175	pfs_create_file(dir, "dbregs", procfs_doprocdbregs,
176	    procfs_attr_rw, procfs_candebug, NULL, PFS_RDWR | PFS_RAW);
177	pfs_create_file(dir, "etype", procfs_doproctype,
178	    NULL, NULL, NULL, PFS_RD);
179	pfs_create_file(dir, "fpregs", procfs_doprocfpregs,
180	    procfs_attr_rw, procfs_candebug, NULL, PFS_RDWR | PFS_RAW);
181	pfs_create_file(dir, "map", procfs_doprocmap,
182	    NULL, procfs_notsystem, NULL, PFS_RD);
183	pfs_create_file(dir, "mem", procfs_doprocmem,
184	    procfs_attr_rw, procfs_candebug, NULL, PFS_RDWR | PFS_RAW);
185	pfs_create_file(dir, "note", procfs_doprocnote,
186	    procfs_attr_w, procfs_candebug, NULL, PFS_WR);
187	pfs_create_file(dir, "notepg", procfs_doprocnote,
188	    procfs_attr_w, procfs_candebug, NULL, PFS_WR);
189	pfs_create_file(dir, "regs", procfs_doprocregs,
190	    procfs_attr_rw, procfs_candebug, NULL, PFS_RDWR | PFS_RAW);
191	pfs_create_file(dir, "rlimit", procfs_doprocrlimit,
192	    NULL, NULL, NULL, PFS_RD);
193	pfs_create_file(dir, "status", procfs_doprocstatus,
194	    NULL, NULL, NULL, PFS_RD);
195	pfs_create_file(dir, "osrel", procfs_doosrel,
196	    procfs_attr_rw, procfs_candebug, NULL, PFS_RDWR);
197
198	pfs_create_link(dir, "file", procfs_doprocfile,
199	    NULL, procfs_notsystem, NULL, 0);
200
201	return (0);
202}
203
204/*
205 * Destructor
206 */
207static int
208procfs_uninit(PFS_INIT_ARGS)
209{
210	/* nothing to do, pseudofs will GC */
211	return (0);
212}
213
214PSEUDOFS(procfs, 1, VFCF_JAIL);
215