1 /* 2 * Copyright (c) 1993 Jan-Simon Pendry 3 * Copyright (c) 1993 4 * The Regents of the University of California. All rights reserved. 5 * 6 * This code is derived from software contributed to Berkeley by 7 * Jan-Simon Pendry. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 3. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 * 33 * @(#)procfs_status.c 8.4 (Berkeley) 6/15/94 34 * 35 * From: 36 * $FreeBSD: src/sys/miscfs/procfs/procfs_status.c,v 1.20.2.4 2002/01/22 17:22:59 nectar Exp $ 37 */ 38 39 #include <sys/param.h> 40 #include <sys/systm.h> 41 #include <sys/malloc.h> 42 #include <sys/proc.h> 43 #include <sys/priv.h> 44 #include <sys/jail.h> 45 #include <sys/vnode.h> 46 #include <sys/tty.h> 47 #include <sys/resourcevar.h> 48 #include <vfs/procfs/procfs.h> 49 50 #include <vm/vm.h> 51 #include <vm/pmap.h> 52 #include <vm/vm_param.h> 53 #include <sys/exec.h> 54 55 #define DOCHECK() do { \ 56 if (ps >= psbuf+sizeof(psbuf)) { \ 57 error = ENOMEM; \ 58 goto bailout; \ 59 } \ 60 } while (0) 61 62 int 63 procfs_dostatus(struct proc *curp, struct lwp *lp, struct pfsnode *pfs, 64 struct uio *uio) 65 { 66 struct proc *p = lp->lwp_proc; 67 struct session *sess; 68 struct tty *tp; 69 struct ucred *cr; 70 char *ps; 71 char *sep; 72 int pid, ppid, pgid, sid; 73 size_t xlen; 74 int i; 75 int error; 76 char psbuf[256]; /* XXX - conservative */ 77 78 if (uio->uio_rw != UIO_READ) 79 return (EOPNOTSUPP); 80 81 pid = p->p_pid; 82 ppid = p->p_pptr ? p->p_pptr->p_pid : 0; 83 pgid = p->p_pgrp->pg_id; 84 sess = p->p_pgrp->pg_session; 85 sid = sess->s_leader ? sess->s_leader->p_pid : 0; 86 87 /* comm pid ppid pgid sid maj,min ctty,sldr start ut st wmsg 88 euid ruid rgid,egid,groups[1 .. NGROUPS] 89 */ 90 KASSERT(sizeof(psbuf) > MAXCOMLEN, 91 ("Too short buffer for new MAXCOMLEN")); 92 93 ps = psbuf; 94 bcopy(p->p_comm, ps, MAXCOMLEN); 95 ps[MAXCOMLEN] = '\0'; 96 ps += strlen(ps); 97 DOCHECK(); 98 ps += ksnprintf(ps, psbuf + sizeof(psbuf) - ps, 99 " %d %d %d %d ", pid, ppid, pgid, sid); 100 DOCHECK(); 101 if ((p->p_flags & P_CONTROLT) && (tp = sess->s_ttyp)) 102 ps += ksnprintf(ps, psbuf + sizeof(psbuf) - ps, 103 "%d,%d ", major(tp->t_dev), minor(tp->t_dev)); 104 else 105 ps += ksnprintf(ps, psbuf + sizeof(psbuf) - ps, 106 "%d,%d ", -1, -1); 107 DOCHECK(); 108 109 sep = ""; 110 if (sess->s_ttyvp) { 111 ps += ksnprintf(ps, psbuf + sizeof(psbuf) - ps, "%sctty", sep); 112 sep = ","; 113 DOCHECK(); 114 } 115 if (SESS_LEADER(p)) { 116 ps += ksnprintf(ps, psbuf + sizeof(psbuf) - ps, "%ssldr", sep); 117 sep = ","; 118 DOCHECK(); 119 } 120 if (*sep != ',') { 121 ps += ksnprintf(ps, psbuf + sizeof(psbuf) - ps, "noflags"); 122 DOCHECK(); 123 } 124 125 if (p->p_flags & P_SWAPPEDOUT) { 126 ps += ksnprintf(ps, psbuf + sizeof(psbuf) - ps, 127 " -1,-1 -1,-1 -1,-1"); 128 } else { 129 struct rusage ru; 130 131 calcru_proc(p, &ru); 132 ps += ksnprintf(ps, psbuf + sizeof(psbuf) - ps, 133 " %ld,%ld %ld,%ld %ld,%ld", 134 p->p_start.tv_sec, 135 p->p_start.tv_usec, 136 ru.ru_utime.tv_sec, ru.ru_utime.tv_usec, 137 ru.ru_stime.tv_sec, ru.ru_stime.tv_usec); 138 } 139 DOCHECK(); 140 141 ps += ksnprintf(ps, psbuf + sizeof(psbuf) - ps, " %s", 142 (lp->lwp_wchan && lp->lwp_wmesg) ? lp->lwp_wmesg : "nochan"); 143 DOCHECK(); 144 145 cr = p->p_ucred; 146 147 ps += ksnprintf(ps, psbuf + sizeof(psbuf) - ps, " %lu %lu %lu", 148 (u_long)cr->cr_uid, 149 (u_long)p->p_ucred->cr_ruid, 150 (u_long)p->p_ucred->cr_rgid); 151 DOCHECK(); 152 153 /* egid (p->p_ucred->cr_svgid) is equal to cr_ngroups[0] 154 see also getegid(2) in /sys/kern/kern_prot.c */ 155 156 for (i = 0; i < cr->cr_ngroups; i++) { 157 ps += ksnprintf(ps, psbuf + sizeof(psbuf) - ps, 158 ",%lu", (u_long)cr->cr_groups[i]); 159 DOCHECK(); 160 } 161 162 if (p->p_ucred->cr_prison) 163 ps += ksnprintf(ps, psbuf + sizeof(psbuf) - ps, 164 " %s", p->p_ucred->cr_prison->pr_host); 165 else 166 ps += ksnprintf(ps, psbuf + sizeof(psbuf) - ps, " -"); 167 DOCHECK(); 168 ps += ksnprintf(ps, psbuf + sizeof(psbuf) - ps, "\n"); 169 DOCHECK(); 170 171 xlen = ps - psbuf; 172 error = uiomove_frombuf(psbuf, xlen, uio); 173 174 bailout: 175 return (error); 176 } 177 178 int 179 procfs_docmdline(struct proc *curp, struct lwp *lp, struct pfsnode *pfs, 180 struct uio *uio) 181 { 182 struct proc *p = lp->lwp_proc; 183 char *ps; 184 int error; 185 char *buf, *bp; 186 struct ps_strings pstr; 187 char **ps_argvstr; 188 int i; 189 size_t bytes_left, done; 190 size_t buflen; 191 192 if (uio->uio_rw != UIO_READ) 193 return (EOPNOTSUPP); 194 195 /* 196 * If we are using the ps/cmdline caching, use that. Otherwise 197 * revert back to the old way which only implements full cmdline 198 * for the currept process and just p->p_comm for all other 199 * processes. 200 * Note that if the argv is no longer available, we deliberately 201 * don't fall back on p->p_comm or return an error: the authentic 202 * Linux behaviour is to return zero-length in this case. 203 */ 204 205 if (p->p_args && 206 (ps_argsopen || (CHECKIO(curp, p) && 207 (p->p_flags & P_INEXEC) == 0 && 208 !p_trespass(curp->p_ucred, p->p_ucred))) 209 ) { 210 bp = p->p_args->ar_args; 211 buflen = p->p_args->ar_length; 212 buf = NULL; 213 } else if (p != curp) { 214 bp = p->p_comm; 215 buflen = MAXCOMLEN; 216 buf = NULL; 217 } else { 218 buflen = 256; 219 buf = kmalloc(buflen + 1, M_TEMP, M_WAITOK); 220 bp = buf; 221 ps = buf; 222 error = copyin((void*)PS_STRINGS, &pstr, sizeof(pstr)); 223 224 if (error) { 225 kfree(buf, M_TEMP); 226 return (error); 227 } 228 if (pstr.ps_nargvstr < 0) { 229 kfree(buf, M_TEMP); 230 return (EINVAL); 231 } 232 if (pstr.ps_nargvstr > ARG_MAX) { 233 kfree(buf, M_TEMP); 234 return (E2BIG); 235 } 236 ps_argvstr = kmalloc(pstr.ps_nargvstr * sizeof(char *), 237 M_TEMP, M_WAITOK); 238 error = copyin((void *)pstr.ps_argvstr, ps_argvstr, 239 pstr.ps_nargvstr * sizeof(char *)); 240 if (error) { 241 kfree(ps_argvstr, M_TEMP); 242 kfree(buf, M_TEMP); 243 return (error); 244 } 245 bytes_left = buflen; 246 for (i = 0; bytes_left && (i < pstr.ps_nargvstr); i++) { 247 error = copyinstr(ps_argvstr[i], ps, 248 bytes_left, &done); 249 /* If too long or malformed, just truncate */ 250 if (error) { 251 error = 0; 252 break; 253 } 254 ps += done; 255 bytes_left -= done; 256 } 257 buflen = ps - buf; 258 kfree(ps_argvstr, M_TEMP); 259 } 260 261 error = uiomove_frombuf(bp, buflen, uio); 262 if (buf) 263 kfree(buf, M_TEMP); 264 return (error); 265 } 266