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 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); 79 vdrop(textvp); 80 if (err) 81 return (err); 82 vn_fullpath(td, textvp, &fullpath, &freepath); 83 VOP_UNLOCK(textvp, 0); 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, NULL, 0); 164 165 dir = pfs_create_dir(root, "pid", 166 procfs_attr, NULL, NULL, PFS_PROCDEP); 167 pfs_create_file(dir, "cmdline", procfs_doproccmdline, 168 NULL, NULL, NULL, PFS_RD); 169 pfs_create_file(dir, "ctl", procfs_doprocctl, 170 procfs_attr, NULL, NULL, PFS_WR); 171 pfs_create_file(dir, "dbregs", procfs_doprocdbregs, 172 procfs_attr, procfs_candebug, NULL, PFS_RDWR|PFS_RAW); 173 pfs_create_file(dir, "etype", procfs_doproctype, 174 NULL, NULL, NULL, PFS_RD); 175 pfs_create_file(dir, "fpregs", procfs_doprocfpregs, 176 procfs_attr, procfs_candebug, NULL, PFS_RDWR|PFS_RAW); 177 pfs_create_file(dir, "map", procfs_doprocmap, 178 NULL, procfs_notsystem, NULL, PFS_RD); 179 node = pfs_create_file(dir, "mem", procfs_doprocmem, 180 procfs_attr, procfs_candebug, NULL, 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, NULL, PFS_WR); 185 pfs_create_file(dir, "notepg", procfs_doprocnote, 186 procfs_attr, procfs_candebug, NULL, PFS_WR); 187 pfs_create_file(dir, "regs", procfs_doprocregs, 188 procfs_attr, procfs_candebug, NULL, PFS_RDWR|PFS_RAW); 189 pfs_create_file(dir, "rlimit", procfs_doprocrlimit, 190 NULL, NULL, NULL, PFS_RD); 191 pfs_create_file(dir, "status", procfs_doprocstatus, 192 NULL, NULL, NULL, PFS_RD); 193 194 pfs_create_link(dir, "file", procfs_doprocfile, 195 NULL, procfs_notsystem, NULL, 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); 211