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 * $FreeBSD$ 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; 71 char *freepath; 72 struct vnode *textvp; 73 int error; 74 75 freepath = NULL; 76 PROC_LOCK(p); 77 textvp = p->p_textvp; 78 vhold(textvp); 79 PROC_UNLOCK(p); 80 error = vn_fullpath(td, textvp, &fullpath, &freepath); 81 vdrop(textvp); 82 if (error == 0) 83 sbuf_printf(sb, "%s", fullpath); 84 if (freepath != NULL) 85 free(freepath, M_TEMP); 86 return (error); 87 } 88 89 /* 90 * Filler function for proc/curproc 91 */ 92 int 93 procfs_docurproc(PFS_FILL_ARGS) 94 { 95 sbuf_printf(sb, "%ld", (long)td->td_proc->p_pid); 96 return (0); 97 } 98 99 /* 100 * Adjust mode for some nodes that need it 101 */ 102 int 103 procfs_attr(PFS_ATTR_ARGS) 104 { 105 106 /* XXX inefficient, split into separate functions */ 107 if (strcmp(pn->pn_name, "note") == 0 || 108 strcmp(pn->pn_name, "notepg") == 0) 109 vap->va_mode = 0200; 110 else if (strcmp(pn->pn_name, "mem") == 0 || 111 strcmp(pn->pn_name, "regs") == 0 || 112 strcmp(pn->pn_name, "dbregs") == 0 || 113 strcmp(pn->pn_name, "fpregs") == 0 || 114 strcmp(pn->pn_name, "osrel") == 0) 115 vap->va_mode = 0600; 116 117 if (p != NULL) { 118 PROC_LOCK_ASSERT(p, MA_OWNED); 119 120 if ((p->p_flag & P_SUGID) && pn->pn_type != pfstype_procdir) 121 vap->va_mode = 0; 122 } 123 124 return (0); 125 } 126 127 /* 128 * Visibility: some files only exist for non-system processes 129 * Non-static because linprocfs uses it. 130 */ 131 int 132 procfs_notsystem(PFS_VIS_ARGS) 133 { 134 PROC_LOCK_ASSERT(p, MA_OWNED); 135 return ((p->p_flag & P_SYSTEM) == 0); 136 } 137 138 /* 139 * Visibility: some files are only visible to process that can debug 140 * the target process. 141 */ 142 int 143 procfs_candebug(PFS_VIS_ARGS) 144 { 145 PROC_LOCK_ASSERT(p, MA_OWNED); 146 return ((p->p_flag & P_SYSTEM) == 0 && p_candebug(td, p) == 0); 147 } 148 149 /* 150 * Constructor 151 */ 152 static int 153 procfs_init(PFS_INIT_ARGS) 154 { 155 struct pfs_node *root; 156 struct pfs_node *dir; 157 struct pfs_node *node; 158 159 root = pi->pi_root; 160 161 pfs_create_link(root, "curproc", procfs_docurproc, 162 NULL, NULL, NULL, 0); 163 164 dir = pfs_create_dir(root, "pid", 165 procfs_attr, 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, 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, procfs_candebug, NULL, PFS_RDWR|PFS_RAW); 174 pfs_create_file(dir, "map", procfs_doprocmap, 175 NULL, procfs_notsystem, NULL, PFS_RD); 176 node = pfs_create_file(dir, "mem", procfs_doprocmem, 177 procfs_attr, procfs_candebug, NULL, PFS_RDWR|PFS_RAW); 178 node->pn_ioctl = procfs_ioctl; 179 node->pn_close = procfs_close; 180 pfs_create_file(dir, "note", procfs_doprocnote, 181 procfs_attr, procfs_candebug, NULL, PFS_WR); 182 pfs_create_file(dir, "notepg", procfs_doprocnote, 183 procfs_attr, procfs_candebug, NULL, PFS_WR); 184 pfs_create_file(dir, "regs", procfs_doprocregs, 185 procfs_attr, 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, 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, PR_ALLOW_MOUNT_PROCFS); 210