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
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 */
65int
66procfs_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 */
85int
86procfs_docurproc(PFS_FILL_ARGS)
87{
88	sbuf_printf(sb, "%ld", (long)td->td_proc->p_pid);
89	return (0);
90}
91
92static int
93procfs_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
105int
106procfs_attr_all_rx(PFS_ATTR_ARGS)
107{
108
109	return (procfs_attr(td, p, pn, vap, 0555));
110}
111
112int
113procfs_attr_rw(PFS_ATTR_ARGS)
114{
115
116	return (procfs_attr(td, p, pn, vap, 0600));
117}
118
119int
120procfs_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 */
130int
131procfs_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 */
141int
142procfs_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 */
151static int
152procfs_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 */
202static int
203procfs_uninit(PFS_INIT_ARGS)
204{
205	/* nothing to do, pseudofs will GC */
206	return (0);
207}
208
209PSEUDOFS(procfs, 1, VFCF_JAIL);
210