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 * $FreeBSD$ 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 */ 69 int 70 procfs_doprocfile(PFS_FILL_ARGS) 71 { 72 char *fullpath, *freepath, *binpath; 73 int error; 74 75 freepath = NULL; 76 binpath = malloc(MAXPATHLEN, M_TEMP, M_WAITOK); 77 PROC_LOCK(p); 78 error = proc_get_binpath(p, binpath, &fullpath, &freepath); 79 if (error == 0) 80 sbuf_cat(sb, fullpath); 81 free(binpath, M_TEMP); 82 free(freepath, M_TEMP); 83 return (error); 84 } 85 86 /* 87 * Filler function for proc/curproc 88 */ 89 int 90 procfs_docurproc(PFS_FILL_ARGS) 91 { 92 sbuf_printf(sb, "%ld", (long)td->td_proc->p_pid); 93 return (0); 94 } 95 96 static int 97 procfs_attr(PFS_ATTR_ARGS, int mode) { 98 vap->va_mode = mode; 99 if (p != NULL) { 100 PROC_LOCK_ASSERT(p, MA_OWNED); 101 102 if ((p->p_flag & P_SUGID) && pn->pn_type != pfstype_procdir) 103 vap->va_mode = 0; 104 } 105 106 return (0); 107 } 108 109 int 110 procfs_attr_all_rx(PFS_ATTR_ARGS) 111 { 112 113 return (procfs_attr(td, p, pn, vap, 0555)); 114 } 115 116 int 117 procfs_attr_rw(PFS_ATTR_ARGS) 118 { 119 120 return (procfs_attr(td, p, pn, vap, 0600)); 121 } 122 123 int 124 procfs_attr_w(PFS_ATTR_ARGS) 125 { 126 127 return (procfs_attr(td, p, pn, vap, 0200)); 128 } 129 130 /* 131 * Visibility: some files only exist for non-system processes 132 * Non-static because linprocfs uses it. 133 */ 134 int 135 procfs_notsystem(PFS_VIS_ARGS) 136 { 137 PROC_LOCK_ASSERT(p, MA_OWNED); 138 return ((p->p_flag & P_SYSTEM) == 0); 139 } 140 141 /* 142 * Visibility: some files are only visible to process that can debug 143 * the target process. 144 */ 145 int 146 procfs_candebug(PFS_VIS_ARGS) 147 { 148 PROC_LOCK_ASSERT(p, MA_OWNED); 149 return ((p->p_flag & P_SYSTEM) == 0 && p_candebug(td, p) == 0); 150 } 151 152 /* 153 * Constructor 154 */ 155 static int 156 procfs_init(PFS_INIT_ARGS) 157 { 158 struct pfs_node *root; 159 struct pfs_node *dir; 160 161 root = pi->pi_root; 162 163 pfs_create_link(root, "curproc", procfs_docurproc, 164 NULL, NULL, NULL, 0); 165 166 dir = pfs_create_dir(root, "pid", 167 procfs_attr_all_rx, NULL, NULL, PFS_PROCDEP); 168 pfs_create_file(dir, "cmdline", procfs_doproccmdline, 169 NULL, NULL, NULL, PFS_RD); 170 pfs_create_file(dir, "dbregs", procfs_doprocdbregs, 171 procfs_attr_rw, procfs_candebug, NULL, PFS_RDWR | PFS_RAW); 172 pfs_create_file(dir, "etype", procfs_doproctype, 173 NULL, NULL, NULL, PFS_RD); 174 pfs_create_file(dir, "fpregs", procfs_doprocfpregs, 175 procfs_attr_rw, procfs_candebug, NULL, PFS_RDWR | PFS_RAW); 176 pfs_create_file(dir, "map", procfs_doprocmap, 177 NULL, procfs_notsystem, NULL, PFS_RD); 178 pfs_create_file(dir, "mem", procfs_doprocmem, 179 procfs_attr_rw, procfs_candebug, NULL, PFS_RDWR | PFS_RAW); 180 pfs_create_file(dir, "note", procfs_doprocnote, 181 procfs_attr_w, procfs_candebug, NULL, PFS_WR); 182 pfs_create_file(dir, "notepg", procfs_doprocnote, 183 procfs_attr_w, procfs_candebug, NULL, PFS_WR); 184 pfs_create_file(dir, "regs", procfs_doprocregs, 185 procfs_attr_rw, procfs_candebug, NULL, PFS_RDWR | PFS_RAW); 186 pfs_create_file(dir, "rlimit", procfs_doprocrlimit, 187 NULL, NULL, NULL, PFS_RD); 188 pfs_create_file(dir, "status", procfs_doprocstatus, 189 NULL, NULL, NULL, PFS_RD); 190 pfs_create_file(dir, "osrel", procfs_doosrel, 191 procfs_attr_rw, procfs_candebug, NULL, PFS_RDWR); 192 193 pfs_create_link(dir, "file", procfs_doprocfile, 194 NULL, procfs_notsystem, NULL, 0); 195 196 return (0); 197 } 198 199 /* 200 * Destructor 201 */ 202 static int 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