1 /*- 2 * Copyright (c) 2001 Dag-Erling Sm�rgrav 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 = "unknown"; 71 char *freepath = NULL; 72 73 vn_lock(p->p_textvp, LK_EXCLUSIVE | LK_RETRY, td); 74 vn_fullpath(td, p->p_textvp, &fullpath, &freepath); 75 VOP_UNLOCK(p->p_textvp, 0, td); 76 sbuf_printf(sb, "%s", fullpath); 77 if (freepath) 78 free(freepath, M_TEMP); 79 return (0); 80 } 81 82 /* 83 * Filler function for proc/curproc 84 */ 85 int 86 procfs_docurproc(PFS_FILL_ARGS) 87 { 88 sbuf_printf(sb, "%ld", (long)td->td_proc->p_pid); 89 return (0); 90 } 91 92 /* 93 * Adjust mode for some nodes that need it 94 */ 95 int 96 procfs_attr(PFS_ATTR_ARGS) 97 { 98 PROC_LOCK_ASSERT(p, MA_OWNED); 99 100 /* XXX inefficient, split into separate functions */ 101 if (p->p_flag & P_SUGID) 102 vap->va_mode = 0; 103 else if (strcmp(pn->pn_name, "ctl") == 0 || 104 strcmp(pn->pn_name, "note") == 0 || 105 strcmp(pn->pn_name, "notepg") == 0) 106 vap->va_mode = 0200; 107 else if (strcmp(pn->pn_name, "mem") == 0 || 108 strcmp(pn->pn_name, "regs") == 0 || 109 strcmp(pn->pn_name, "dbregs") == 0 || 110 strcmp(pn->pn_name, "fpregs") == 0) 111 vap->va_mode = 0600; 112 113 vap->va_uid = p->p_ucred->cr_uid; 114 vap->va_gid = p->p_ucred->cr_gid; 115 116 return (0); 117 } 118 119 /* 120 * Visibility: some files only exist for non-system processes 121 * Non-static because linprocfs uses it. 122 */ 123 int 124 procfs_notsystem(PFS_VIS_ARGS) 125 { 126 PROC_LOCK_ASSERT(p, MA_OWNED); 127 return ((p->p_flag & P_SYSTEM) == 0); 128 } 129 130 /* 131 * Visibility: some files are only visible to process that can debug 132 * the target process. 133 */ 134 int 135 procfs_candebug(PFS_VIS_ARGS) 136 { 137 PROC_LOCK_ASSERT(p, MA_OWNED); 138 return ((p->p_flag & P_SYSTEM) == 0 && p_candebug(td, p) == 0); 139 } 140 141 /* 142 * Constructor 143 */ 144 static int 145 procfs_init(PFS_INIT_ARGS) 146 { 147 struct pfs_node *root; 148 struct pfs_node *dir; 149 struct pfs_node *node; 150 151 root = pi->pi_root; 152 153 pfs_create_link(root, "curproc", procfs_docurproc, 154 NULL, NULL, 0); 155 156 dir = pfs_create_dir(root, "pid", 157 procfs_attr, NULL, PFS_PROCDEP); 158 pfs_create_file(dir, "cmdline", procfs_doproccmdline, 159 NULL, NULL, PFS_RD); 160 pfs_create_file(dir, "ctl", procfs_doprocctl, 161 procfs_attr, NULL, PFS_WR); 162 pfs_create_file(dir, "dbregs", procfs_doprocdbregs, 163 procfs_attr, procfs_candebug, PFS_RDWR|PFS_RAW); 164 pfs_create_file(dir, "etype", procfs_doproctype, 165 NULL, NULL, PFS_RD); 166 pfs_create_file(dir, "fpregs", procfs_doprocfpregs, 167 procfs_attr, procfs_candebug, PFS_RDWR|PFS_RAW); 168 pfs_create_file(dir, "map", procfs_doprocmap, 169 NULL, procfs_notsystem, PFS_RD); 170 node = pfs_create_file(dir, "mem", procfs_doprocmem, 171 procfs_attr, procfs_candebug, PFS_RDWR|PFS_RAW); 172 node->pn_ioctl = procfs_ioctl; 173 node->pn_close = procfs_close; 174 pfs_create_file(dir, "note", procfs_doprocnote, 175 procfs_attr, procfs_candebug, PFS_WR); 176 pfs_create_file(dir, "notepg", procfs_doprocnote, 177 procfs_attr, procfs_candebug, PFS_WR); 178 pfs_create_file(dir, "regs", procfs_doprocregs, 179 procfs_attr, procfs_candebug, PFS_RDWR|PFS_RAW); 180 pfs_create_file(dir, "rlimit", procfs_doprocrlimit, 181 NULL, NULL, PFS_RD); 182 pfs_create_file(dir, "status", procfs_doprocstatus, 183 NULL, NULL, PFS_RD); 184 185 pfs_create_link(dir, "file", procfs_doprocfile, 186 NULL, procfs_notsystem, 0); 187 188 return (0); 189 } 190 191 /* 192 * Destructor 193 */ 194 static int 195 procfs_uninit(PFS_INIT_ARGS) 196 { 197 /* nothing to do, pseudofs will GC */ 198 return (0); 199 } 200 201 PSEUDOFS(procfs, 1); 202