kern_core.c revision 1.3.2.7
1 1.3.2.7 yamt /* $NetBSD: kern_core.c,v 1.3.2.7 2008/02/04 09:24:08 yamt Exp $ */ 2 1.3.2.2 yamt 3 1.3.2.2 yamt /* 4 1.3.2.2 yamt * Copyright (c) 1982, 1986, 1989, 1991, 1993 5 1.3.2.2 yamt * The Regents of the University of California. All rights reserved. 6 1.3.2.2 yamt * (c) UNIX System Laboratories, Inc. 7 1.3.2.2 yamt * All or some portions of this file are derived from material licensed 8 1.3.2.2 yamt * to the University of California by American Telephone and Telegraph 9 1.3.2.2 yamt * Co. or Unix System Laboratories, Inc. and are reproduced herein with 10 1.3.2.2 yamt * the permission of UNIX System Laboratories, Inc. 11 1.3.2.2 yamt * 12 1.3.2.2 yamt * Redistribution and use in source and binary forms, with or without 13 1.3.2.2 yamt * modification, are permitted provided that the following conditions 14 1.3.2.2 yamt * are met: 15 1.3.2.2 yamt * 1. Redistributions of source code must retain the above copyright 16 1.3.2.2 yamt * notice, this list of conditions and the following disclaimer. 17 1.3.2.2 yamt * 2. Redistributions in binary form must reproduce the above copyright 18 1.3.2.2 yamt * notice, this list of conditions and the following disclaimer in the 19 1.3.2.2 yamt * documentation and/or other materials provided with the distribution. 20 1.3.2.2 yamt * 3. Neither the name of the University nor the names of its contributors 21 1.3.2.2 yamt * may be used to endorse or promote products derived from this software 22 1.3.2.2 yamt * without specific prior written permission. 23 1.3.2.2 yamt * 24 1.3.2.2 yamt * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 25 1.3.2.2 yamt * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 26 1.3.2.2 yamt * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 27 1.3.2.2 yamt * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 28 1.3.2.2 yamt * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 29 1.3.2.2 yamt * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 30 1.3.2.2 yamt * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 31 1.3.2.2 yamt * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 32 1.3.2.2 yamt * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 33 1.3.2.2 yamt * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 34 1.3.2.2 yamt * SUCH DAMAGE. 35 1.3.2.2 yamt * 36 1.3.2.2 yamt * @(#)kern_sig.c 8.14 (Berkeley) 5/14/95 37 1.3.2.2 yamt */ 38 1.3.2.2 yamt 39 1.3.2.2 yamt #include <sys/cdefs.h> 40 1.3.2.7 yamt __KERNEL_RCSID(0, "$NetBSD: kern_core.c,v 1.3.2.7 2008/02/04 09:24:08 yamt Exp $"); 41 1.3.2.2 yamt 42 1.3.2.2 yamt #include "opt_coredump.h" 43 1.3.2.2 yamt 44 1.3.2.2 yamt #include <sys/param.h> 45 1.3.2.2 yamt #include <sys/vnode.h> 46 1.3.2.2 yamt #include <sys/namei.h> 47 1.3.2.2 yamt #include <sys/acct.h> 48 1.3.2.2 yamt #include <sys/file.h> 49 1.3.2.2 yamt #include <sys/stat.h> 50 1.3.2.2 yamt #include <sys/proc.h> 51 1.3.2.2 yamt #include <sys/exec.h> 52 1.3.2.2 yamt #include <sys/filedesc.h> 53 1.3.2.2 yamt #include <sys/kauth.h> 54 1.3.2.2 yamt 55 1.3.2.2 yamt #if !defined(COREDUMP) 56 1.3.2.2 yamt 57 1.3.2.2 yamt int 58 1.3.2.2 yamt coredump(struct lwp *l, const char *pattern) 59 1.3.2.2 yamt { 60 1.3.2.2 yamt 61 1.3.2.2 yamt return (ENOSYS); 62 1.3.2.2 yamt } 63 1.3.2.2 yamt 64 1.3.2.2 yamt #else /* COREDUMP */ 65 1.3.2.2 yamt 66 1.3.2.2 yamt struct coredump_iostate { 67 1.3.2.2 yamt struct lwp *io_lwp; 68 1.3.2.2 yamt struct vnode *io_vp; 69 1.3.2.2 yamt kauth_cred_t io_cred; 70 1.3.2.2 yamt off_t io_offset; 71 1.3.2.2 yamt }; 72 1.3.2.2 yamt 73 1.3.2.2 yamt static int coredump_buildname(struct proc *, char *, const char *, size_t); 74 1.3.2.2 yamt 75 1.3.2.2 yamt /* 76 1.3.2.2 yamt * Dump core, into a file named "progname.core" or "core" (depending on the 77 1.3.2.2 yamt * value of shortcorename), unless the process was setuid/setgid. 78 1.3.2.2 yamt */ 79 1.3.2.2 yamt int 80 1.3.2.2 yamt coredump(struct lwp *l, const char *pattern) 81 1.3.2.2 yamt { 82 1.3.2.2 yamt struct vnode *vp; 83 1.3.2.2 yamt struct proc *p; 84 1.3.2.2 yamt struct vmspace *vm; 85 1.3.2.2 yamt kauth_cred_t cred; 86 1.3.2.2 yamt struct nameidata nd; 87 1.3.2.2 yamt struct vattr vattr; 88 1.3.2.2 yamt struct coredump_iostate io; 89 1.3.2.4 yamt struct plimit *lim; 90 1.3.2.2 yamt int error, error1; 91 1.3.2.4 yamt char *name; 92 1.3.2.4 yamt 93 1.3.2.4 yamt name = PNBUF_GET(); 94 1.3.2.2 yamt 95 1.3.2.2 yamt p = l->l_proc; 96 1.3.2.2 yamt vm = p->p_vmspace; 97 1.3.2.2 yamt 98 1.3.2.3 yamt mutex_enter(&proclist_lock); /* p_session */ 99 1.3.2.2 yamt mutex_enter(&p->p_mutex); 100 1.3.2.2 yamt 101 1.3.2.2 yamt /* 102 1.3.2.2 yamt * Refuse to core if the data + stack + user size is larger than 103 1.3.2.2 yamt * the core dump limit. XXX THIS IS WRONG, because of mapped 104 1.3.2.2 yamt * data. 105 1.3.2.2 yamt */ 106 1.3.2.2 yamt if (USPACE + ctob(vm->vm_dsize + vm->vm_ssize) >= 107 1.3.2.2 yamt p->p_rlimit[RLIMIT_CORE].rlim_cur) { 108 1.3.2.4 yamt error = EFBIG; /* better error code? */ 109 1.3.2.2 yamt mutex_exit(&p->p_mutex); 110 1.3.2.3 yamt mutex_exit(&proclist_lock); 111 1.3.2.4 yamt goto done; 112 1.3.2.2 yamt } 113 1.3.2.2 yamt 114 1.3.2.2 yamt /* 115 1.3.2.2 yamt * It may well not be curproc, so grab a reference to its current 116 1.3.2.2 yamt * credentials. 117 1.3.2.2 yamt */ 118 1.3.2.2 yamt kauth_cred_hold(p->p_cred); 119 1.3.2.2 yamt cred = p->p_cred; 120 1.3.2.2 yamt 121 1.3.2.2 yamt /* 122 1.3.2.2 yamt * The core dump will go in the current working directory. Make 123 1.3.2.2 yamt * sure that the directory is still there and that the mount flags 124 1.3.2.2 yamt * allow us to write core dumps there. 125 1.3.2.4 yamt * 126 1.3.2.4 yamt * XXX: this is partially bogus, it should be checking the directory 127 1.3.2.4 yamt * into which the file is actually written - which probably needs 128 1.3.2.4 yamt * a flag on namei() 129 1.3.2.2 yamt */ 130 1.3.2.2 yamt vp = p->p_cwdi->cwdi_cdir; 131 1.3.2.2 yamt if (vp->v_mount == NULL || 132 1.3.2.2 yamt (vp->v_mount->mnt_flag & MNT_NOCOREDUMP) != 0) { 133 1.3.2.2 yamt error = EPERM; 134 1.3.2.2 yamt mutex_exit(&p->p_mutex); 135 1.3.2.3 yamt mutex_exit(&proclist_lock); 136 1.3.2.2 yamt goto done; 137 1.3.2.2 yamt } 138 1.3.2.2 yamt 139 1.3.2.4 yamt /* 140 1.3.2.4 yamt * Make sure the process has not set-id, to prevent data leaks, 141 1.3.2.4 yamt * unless it was specifically requested to allow set-id coredumps. 142 1.3.2.4 yamt */ 143 1.3.2.4 yamt if (p->p_flag & PK_SUGID) { 144 1.3.2.4 yamt if (!security_setidcore_dump) { 145 1.3.2.4 yamt error = EPERM; 146 1.3.2.4 yamt mutex_exit(&p->p_mutex); 147 1.3.2.4 yamt mutex_exit(&proclist_lock); 148 1.3.2.4 yamt goto done; 149 1.3.2.4 yamt } 150 1.3.2.2 yamt pattern = security_setidcore_path; 151 1.3.2.4 yamt } 152 1.3.2.2 yamt 153 1.3.2.4 yamt /* It is (just) possible for p_limit and pl_corename to change */ 154 1.3.2.4 yamt lim = p->p_limit; 155 1.3.2.4 yamt mutex_enter(&lim->pl_lock); 156 1.3.2.2 yamt if (pattern == NULL) 157 1.3.2.4 yamt pattern = lim->pl_corename; 158 1.3.2.2 yamt error = coredump_buildname(p, name, pattern, MAXPATHLEN); 159 1.3.2.4 yamt mutex_exit(&lim->pl_lock); 160 1.3.2.2 yamt mutex_exit(&p->p_mutex); 161 1.3.2.3 yamt mutex_exit(&proclist_lock); 162 1.3.2.2 yamt if (error) 163 1.3.2.2 yamt goto done; 164 1.3.2.6 yamt NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_SYSSPACE, name); 165 1.3.2.2 yamt if ((error = vn_open(&nd, O_CREAT | O_NOFOLLOW | FWRITE, 166 1.3.2.2 yamt S_IRUSR | S_IWUSR)) != 0) 167 1.3.2.2 yamt goto done; 168 1.3.2.2 yamt vp = nd.ni_vp; 169 1.3.2.2 yamt 170 1.3.2.2 yamt /* Don't dump to non-regular files or files with links. */ 171 1.3.2.2 yamt if (vp->v_type != VREG || 172 1.3.2.5 yamt VOP_GETATTR(vp, &vattr, cred) || vattr.va_nlink != 1) { 173 1.3.2.2 yamt error = EINVAL; 174 1.3.2.2 yamt goto out; 175 1.3.2.2 yamt } 176 1.3.2.2 yamt VATTR_NULL(&vattr); 177 1.3.2.2 yamt vattr.va_size = 0; 178 1.3.2.2 yamt 179 1.3.2.2 yamt if ((p->p_flag & PK_SUGID) && security_setidcore_dump) { 180 1.3.2.2 yamt vattr.va_uid = security_setidcore_owner; 181 1.3.2.2 yamt vattr.va_gid = security_setidcore_group; 182 1.3.2.2 yamt vattr.va_mode = security_setidcore_mode; 183 1.3.2.2 yamt } 184 1.3.2.2 yamt 185 1.3.2.5 yamt VOP_SETATTR(vp, &vattr, cred); 186 1.3.2.2 yamt p->p_acflag |= ACORE; 187 1.3.2.2 yamt 188 1.3.2.2 yamt io.io_lwp = l; 189 1.3.2.2 yamt io.io_vp = vp; 190 1.3.2.2 yamt io.io_cred = cred; 191 1.3.2.2 yamt io.io_offset = 0; 192 1.3.2.2 yamt 193 1.3.2.2 yamt /* Now dump the actual core file. */ 194 1.3.2.2 yamt error = (*p->p_execsw->es_coredump)(l, &io); 195 1.3.2.2 yamt out: 196 1.3.2.2 yamt VOP_UNLOCK(vp, 0); 197 1.3.2.2 yamt error1 = vn_close(vp, FWRITE, cred, l); 198 1.3.2.2 yamt if (error == 0) 199 1.3.2.2 yamt error = error1; 200 1.3.2.2 yamt done: 201 1.3.2.2 yamt if (name != NULL) 202 1.3.2.2 yamt PNBUF_PUT(name); 203 1.3.2.2 yamt return error; 204 1.3.2.2 yamt } 205 1.3.2.2 yamt 206 1.3.2.2 yamt static int 207 1.3.2.2 yamt coredump_buildname(struct proc *p, char *dst, const char *src, size_t len) 208 1.3.2.2 yamt { 209 1.3.2.2 yamt const char *s; 210 1.3.2.2 yamt char *d, *end; 211 1.3.2.2 yamt int i; 212 1.3.2.2 yamt 213 1.3.2.3 yamt KASSERT(mutex_owned(&proclist_lock)); 214 1.3.2.2 yamt 215 1.3.2.2 yamt for (s = src, d = dst, end = d + len; *s != '\0'; s++) { 216 1.3.2.2 yamt if (*s == '%') { 217 1.3.2.2 yamt switch (*(s + 1)) { 218 1.3.2.2 yamt case 'n': 219 1.3.2.2 yamt i = snprintf(d, end - d, "%s", p->p_comm); 220 1.3.2.2 yamt break; 221 1.3.2.2 yamt case 'p': 222 1.3.2.2 yamt i = snprintf(d, end - d, "%d", p->p_pid); 223 1.3.2.2 yamt break; 224 1.3.2.2 yamt case 'u': 225 1.3.2.2 yamt i = snprintf(d, end - d, "%.*s", 226 1.3.2.2 yamt (int)sizeof p->p_pgrp->pg_session->s_login, 227 1.3.2.2 yamt p->p_pgrp->pg_session->s_login); 228 1.3.2.2 yamt break; 229 1.3.2.2 yamt case 't': 230 1.3.2.2 yamt i = snprintf(d, end - d, "%ld", 231 1.3.2.2 yamt p->p_stats->p_start.tv_sec); 232 1.3.2.2 yamt break; 233 1.3.2.2 yamt default: 234 1.3.2.2 yamt goto copy; 235 1.3.2.2 yamt } 236 1.3.2.2 yamt d += i; 237 1.3.2.2 yamt s++; 238 1.3.2.2 yamt } else { 239 1.3.2.2 yamt copy: *d = *s; 240 1.3.2.2 yamt d++; 241 1.3.2.2 yamt } 242 1.3.2.2 yamt if (d >= end) 243 1.3.2.2 yamt return (ENAMETOOLONG); 244 1.3.2.2 yamt } 245 1.3.2.2 yamt *d = '\0'; 246 1.3.2.2 yamt return 0; 247 1.3.2.2 yamt } 248 1.3.2.2 yamt 249 1.3.2.2 yamt int 250 1.3.2.2 yamt coredump_write(void *cookie, enum uio_seg segflg, const void *data, size_t len) 251 1.3.2.2 yamt { 252 1.3.2.2 yamt struct coredump_iostate *io = cookie; 253 1.3.2.2 yamt int error; 254 1.3.2.2 yamt 255 1.3.2.2 yamt error = vn_rdwr(UIO_WRITE, io->io_vp, __UNCONST(data), len, 256 1.3.2.2 yamt io->io_offset, segflg, 257 1.3.2.2 yamt IO_NODELOCKED|IO_UNIT, io->io_cred, NULL, 258 1.3.2.2 yamt segflg == UIO_USERSPACE ? io->io_lwp : NULL); 259 1.3.2.2 yamt if (error) { 260 1.3.2.2 yamt printf("pid %d (%s): %s write of %zu@%p at %lld failed: %d\n", 261 1.3.2.2 yamt io->io_lwp->l_proc->p_pid, io->io_lwp->l_proc->p_comm, 262 1.3.2.2 yamt segflg == UIO_USERSPACE ? "user" : "system", 263 1.3.2.2 yamt len, data, (long long) io->io_offset, error); 264 1.3.2.2 yamt return (error); 265 1.3.2.2 yamt } 266 1.3.2.2 yamt 267 1.3.2.2 yamt io->io_offset += len; 268 1.3.2.2 yamt return (0); 269 1.3.2.2 yamt } 270 1.3.2.2 yamt 271 1.3.2.2 yamt #endif /* COREDUMP */ 272
Indexes created Sun Sep 21 20:09:37 GMT 2025