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; 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(td, 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 */ 94 int 95 procfs_docurproc(PFS_FILL_ARGS) 96 { 97 sbuf_printf(sb, "%ld", (long)td->td_proc->p_pid); 98 return (0); 99 } 100 101 static int 102 procfs_attr(PFS_ATTR_ARGS, int mode) { 103 104 vap->va_mode = mode; 105 if (p != NULL) { 106 PROC_LOCK_ASSERT(p, MA_OWNED); 107 108 if ((p->p_flag & P_SUGID) && pn->pn_type != pfstype_procdir) 109 vap->va_mode = 0; 110 } 111 112 return (0); 113 } 114 115 int 116 procfs_attr_all_rx(PFS_ATTR_ARGS) 117 { 118 119 return (procfs_attr(td, p, pn, vap, 0555)); 120 } 121 122 int 123 procfs_attr_rw(PFS_ATTR_ARGS) 124 { 125 126 return (procfs_attr(td, p, pn, vap, 0600)); 127 } 128 129 int 130 procfs_attr_w(PFS_ATTR_ARGS) 131 { 132 133 return (procfs_attr(td, p, pn, vap, 0200)); 134 } 135 136 /* 137 * Visibility: some files only exist for non-system processes 138 * Non-static because linprocfs uses it. 139 */ 140 int 141 procfs_notsystem(PFS_VIS_ARGS) 142 { 143 PROC_LOCK_ASSERT(p, MA_OWNED); 144 return ((p->p_flag & P_SYSTEM) == 0); 145 } 146 147 /* 148 * Visibility: some files are only visible to process that can debug 149 * the target process. 150 */ 151 int 152 procfs_candebug(PFS_VIS_ARGS) 153 { 154 PROC_LOCK_ASSERT(p, MA_OWNED); 155 return ((p->p_flag & P_SYSTEM) == 0 && p_candebug(td, p) == 0); 156 } 157 158 /* 159 * Constructor 160 */ 161 static int 162 procfs_init(PFS_INIT_ARGS) 163 { 164 struct pfs_node *root; 165 struct pfs_node *dir; 166 struct pfs_node *node; 167 168 root = pi->pi_root; 169 170 pfs_create_link(root, "curproc", procfs_docurproc, 171 NULL, NULL, NULL, 0); 172 173 dir = pfs_create_dir(root, "pid", 174 procfs_attr_all_rx, NULL, NULL, PFS_PROCDEP); 175 pfs_create_file(dir, "cmdline", procfs_doproccmdline, 176 NULL, NULL, NULL, PFS_RD); 177 pfs_create_file(dir, "dbregs", procfs_doprocdbregs, 178 procfs_attr_rw, procfs_candebug, NULL, PFS_RDWR | PFS_RAW); 179 pfs_create_file(dir, "etype", procfs_doproctype, 180 NULL, NULL, NULL, PFS_RD); 181 pfs_create_file(dir, "fpregs", procfs_doprocfpregs, 182 procfs_attr_rw, procfs_candebug, NULL, PFS_RDWR | PFS_RAW); 183 pfs_create_file(dir, "map", procfs_doprocmap, 184 NULL, procfs_notsystem, NULL, PFS_RD); 185 node = pfs_create_file(dir, "mem", procfs_doprocmem, 186 procfs_attr_rw, procfs_candebug, NULL, PFS_RDWR | PFS_RAW); 187 node->pn_ioctl = procfs_ioctl; 188 node->pn_close = procfs_close; 189 pfs_create_file(dir, "note", procfs_doprocnote, 190 procfs_attr_w, procfs_candebug, NULL, PFS_WR); 191 pfs_create_file(dir, "notepg", procfs_doprocnote, 192 procfs_attr_w, procfs_candebug, NULL, PFS_WR); 193 pfs_create_file(dir, "regs", procfs_doprocregs, 194 procfs_attr_rw, procfs_candebug, NULL, PFS_RDWR | PFS_RAW); 195 pfs_create_file(dir, "rlimit", procfs_doprocrlimit, 196 NULL, NULL, NULL, PFS_RD); 197 pfs_create_file(dir, "status", procfs_doprocstatus, 198 NULL, NULL, NULL, PFS_RD); 199 pfs_create_file(dir, "osrel", procfs_doosrel, 200 procfs_attr_rw, procfs_candebug, NULL, PFS_RDWR); 201 202 pfs_create_link(dir, "file", procfs_doprocfile, 203 NULL, procfs_notsystem, NULL, 0); 204 205 return (0); 206 } 207 208 /* 209 * Destructor 210 */ 211 static int 212 procfs_uninit(PFS_INIT_ARGS) 213 { 214 /* nothing to do, pseudofs will GC */ 215 return (0); 216 } 217 218 PSEUDOFS(procfs, 1, VFCF_JAIL); 219