FreeBSD/Linux Kernel Cross Reference
sys/fs/procfs/procfs.c
1 /*-
2 * Copyright (c) 2001 Dag-Erling Smørgrav
3 * Copyright (c) 1993 Jan-Simon Pendry
4 * Copyright (c) 1993
5 * The Regents of the University of California. All rights reserved.
6 *
7 * This code is derived from software contributed to Berkeley by
8 * Jan-Simon Pendry.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 * 3. All advertising materials mentioning features or use of this software
19 * must display the following acknowledgement:
20 * This product includes software developed by the University of
21 * California, Berkeley and its contributors.
22 * 4. Neither the name of the University nor the names of its contributors
23 * may be used to endorse or promote products derived from this software
24 * without specific prior written permission.
25 *
26 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
27 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
28 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
29 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
30 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
31 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
32 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
33 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
34 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
35 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
36 * SUCH DAMAGE.
37 *
38 * @(#)procfs_vfsops.c 8.7 (Berkeley) 5/10/95
39 *
40 * $FreeBSD: releng/6.4/sys/fs/procfs/procfs.c 166707 2007-02-14 10:24:50Z kib $
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/self
66 */
67 int
68 procfs_doprocfile(PFS_FILL_ARGS)
69 {
70 char *fullpath = "unknown";
71 char *freepath = NULL;
72 struct vnode *textvp;
73 int err;
74
75 textvp = p->p_textvp;
76 VI_LOCK(textvp);
77 vholdl(textvp);
78 err = vn_lock(textvp, LK_EXCLUSIVE | LK_INTERLOCK, td);
79 vdrop(textvp);
80 if (err)
81 return (err);
82 vn_fullpath(td, textvp, &fullpath, &freepath);
83 VOP_UNLOCK(textvp, 0, td);
84 sbuf_printf(sb, "%s", fullpath);
85 if (freepath)
86 free(freepath, M_TEMP);
87 return (0);
88 }
89
90 /*
91 * Filler function for proc/curproc
92 */
93 int
94 procfs_docurproc(PFS_FILL_ARGS)
95 {
96 sbuf_printf(sb, "%ld", (long)td->td_proc->p_pid);
97 return (0);
98 }
99
100 /*
101 * Adjust mode for some nodes that need it
102 */
103 int
104 procfs_attr(PFS_ATTR_ARGS)
105 {
106 PROC_LOCK_ASSERT(p, MA_OWNED);
107
108 /* XXX inefficient, split into separate functions */
109 if (strcmp(pn->pn_name, "ctl") == 0 ||
110 strcmp(pn->pn_name, "note") == 0 ||
111 strcmp(pn->pn_name, "notepg") == 0)
112 vap->va_mode = 0200;
113 else if (strcmp(pn->pn_name, "mem") == 0 ||
114 strcmp(pn->pn_name, "regs") == 0 ||
115 strcmp(pn->pn_name, "dbregs") == 0 ||
116 strcmp(pn->pn_name, "fpregs") == 0)
117 vap->va_mode = 0600;
118
119 if ((p->p_flag & P_SUGID) && pn->pn_type != pfstype_procdir)
120 vap->va_mode = 0;
121
122 vap->va_uid = p->p_ucred->cr_uid;
123 vap->va_gid = p->p_ucred->cr_gid;
124
125 return (0);
126 }
127
128 /*
129 * Visibility: some files only exist for non-system processes
130 * Non-static because linprocfs uses it.
131 */
132 int
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
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
154 procfs_init(PFS_INIT_ARGS)
155 {
156 struct pfs_node *root;
157 struct pfs_node *dir;
158 struct pfs_node *node;
159
160 root = pi->pi_root;
161
162 pfs_create_link(root, "curproc", procfs_docurproc,
163 NULL, NULL, 0);
164
165 dir = pfs_create_dir(root, "pid",
166 procfs_attr, NULL, PFS_PROCDEP);
167 pfs_create_file(dir, "cmdline", procfs_doproccmdline,
168 NULL, NULL, PFS_RD);
169 pfs_create_file(dir, "ctl", procfs_doprocctl,
170 procfs_attr, NULL, PFS_WR);
171 pfs_create_file(dir, "dbregs", procfs_doprocdbregs,
172 procfs_attr, procfs_candebug, PFS_RDWR|PFS_RAW);
173 pfs_create_file(dir, "etype", procfs_doproctype,
174 NULL, NULL, PFS_RD);
175 pfs_create_file(dir, "fpregs", procfs_doprocfpregs,
176 procfs_attr, procfs_candebug, PFS_RDWR|PFS_RAW);
177 pfs_create_file(dir, "map", procfs_doprocmap,
178 NULL, procfs_notsystem, PFS_RD);
179 node = pfs_create_file(dir, "mem", procfs_doprocmem,
180 procfs_attr, procfs_candebug, PFS_RDWR|PFS_RAW);
181 node->pn_ioctl = procfs_ioctl;
182 node->pn_close = procfs_close;
183 pfs_create_file(dir, "note", procfs_doprocnote,
184 procfs_attr, procfs_candebug, PFS_WR);
185 pfs_create_file(dir, "notepg", procfs_doprocnote,
186 procfs_attr, procfs_candebug, PFS_WR);
187 pfs_create_file(dir, "regs", procfs_doprocregs,
188 procfs_attr, procfs_candebug, PFS_RDWR|PFS_RAW);
189 pfs_create_file(dir, "rlimit", procfs_doprocrlimit,
190 NULL, NULL, PFS_RD);
191 pfs_create_file(dir, "status", procfs_doprocstatus,
192 NULL, NULL, PFS_RD);
193
194 pfs_create_link(dir, "file", procfs_doprocfile,
195 NULL, procfs_notsystem, 0);
196
197 return (0);
198 }
199
200 /*
201 * Destructor
202 */
203 static int
204 procfs_uninit(PFS_INIT_ARGS)
205 {
206 /* nothing to do, pseudofs will GC */
207 return (0);
208 }
209
210 PSEUDOFS(procfs, 1);
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