1 /* 2 * CDDL HEADER START 3 * 4 * The contents of this file are subject to the terms of the 5 * Common Development and Distribution License (the "License"). 6 * You may not use this file except in compliance with the License. 7 * 8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9 * or http://www.opensolaris.org/os/licensing. 10 * See the License for the specific language governing permissions 11 * and limitations under the License. 12 * 13 * When distributing Covered Code, include this CDDL HEADER in each 14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15 * If applicable, add the following below this CDDL HEADER, with the 16 * fields enclosed by brackets "[]" replaced with your own identifying 17 * information: Portions Copyright [yyyy] [name of copyright owner] 18 * 19 * CDDL HEADER END 20 */ 21 /* 22 * Copyright 2007 Sun Microsystems, Inc. All rights reserved. 23 * Use is subject to license terms. 24 */ 25 26 /* Copyright (c) 1983, 1984, 1985, 1986, 1987, 1988, 1989 AT&T */ 27 /* All Rights Reserved */ 28 29 /* 30 * Portions of this source code were derived from Berkeley 4.3 BSD 31 * under license from the Regents of the University of California. 32 */ 33 34 #pragma ident "%Z%%M% %I% %E% SMI" 35 36 #include <sys/param.h> 37 #include <sys/isa_defs.h> 38 #include <sys/types.h> 39 #include <sys/sysmacros.h> 40 #include <sys/user.h> 41 #include <sys/systm.h> 42 #include <sys/errno.h> 43 #include <sys/fcntl.h> 44 #include <sys/stat.h> 45 #include <sys/vnode.h> 46 #include <sys/vfs.h> 47 #include <sys/file.h> 48 #include <sys/mode.h> 49 #include <sys/uio.h> 50 #include <sys/debug.h> 51 #include <c2/audit.h> 52 #include <sys/cmn_err.h> 53 54 /* 55 * Common code for open()/openat() and creat(). Check permissions, allocate 56 * an open file structure, and call the device open routine (if any). 57 */ 58 59 static int 60 copen(int startfd, char *fname, int filemode, int createmode) 61 { 62 struct pathname pn; 63 vnode_t *vp, *sdvp; 64 file_t *fp, *startfp; 65 enum vtype type; 66 int error; 67 int fd, dupfd; 68 vnode_t *startvp; 69 proc_t *p = curproc; 70 uio_seg_t seg = UIO_USERSPACE; 71 char *open_filename = fname; 72 73 if (startfd == AT_FDCWD) { 74 /* 75 * Regular open() 76 */ 77 startvp = NULL; 78 } else { 79 /* 80 * We're here via openat() 81 */ 82 char startchar; 83 84 if (copyin(fname, &startchar, sizeof (char))) 85 return (set_errno(EFAULT)); 86 87 /* 88 * if startchar is / then startfd is ignored 89 */ 90 if (startchar == '/') 91 startvp = NULL; 92 else { 93 if ((startfp = getf(startfd)) == NULL) 94 return (set_errno(EBADF)); 95 startvp = startfp->f_vnode; 96 VN_HOLD(startvp); 97 releasef(startfd); 98 } 99 } 100 101 /* 102 * Handle openattrdirat request 103 */ 104 if (filemode & FXATTRDIROPEN) { 105 if (audit_active) 106 audit_setfsat_path(1); 107 108 if (error = lookupnameat(fname, seg, FOLLOW, 109 NULLVPP, &vp, startvp)) 110 return (set_errno(error)); 111 if (startvp) { 112 VN_RELE(startvp); 113 startvp = NULL; 114 } 115 116 startvp = vp; 117 } 118 119 /* 120 * Do we need to go into extended attribute space? 121 */ 122 if (filemode & (FXATTR|FXATTRDIROPEN)) { 123 vattr_t vattr; 124 125 /* 126 * Make sure we have a valid request. 127 * We must either have a real fd or AT_FDCWD 128 */ 129 130 if (startfd != AT_FDCWD && startvp == NULL) { 131 error = EINVAL; 132 goto out; 133 } 134 135 if (error = pn_get(fname, UIO_USERSPACE, &pn)) { 136 goto out; 137 } 138 139 if (startfd == AT_FDCWD && !(filemode & FXATTRDIROPEN)) { 140 mutex_enter(&p->p_lock); 141 startvp = PTOU(p)->u_cdir; 142 VN_HOLD(startvp); 143 mutex_exit(&p->p_lock); 144 } 145 146 /* 147 * In order to access hidden attribute directory the 148 * user must be able to stat() the file 149 */ 150 151 vattr.va_mask = AT_ALL; 152 if (error = VOP_GETATTR(startvp, &vattr, 0, CRED(), NULL)) { 153 pn_free(&pn); 154 goto out; 155 } 156 157 if ((startvp->v_vfsp->vfs_flag & VFS_XATTR) != 0 || 158 vfs_has_feature(startvp->v_vfsp, VFSFT_XVATTR)) { 159 error = VOP_LOOKUP(startvp, "", &sdvp, &pn, 160 LOOKUP_XATTR|CREATE_XATTR_DIR, rootvp, CRED(), 161 NULL, NULL, NULL); 162 } else { 163 error = EINVAL; 164 } 165 166 /* 167 * For openattrdirat use "." as filename to open 168 * as part of vn_openat() 169 */ 170 if (error == 0 && (filemode & FXATTRDIROPEN)) { 171 open_filename = "."; 172 seg = UIO_SYSSPACE; 173 } 174 175 pn_free(&pn); 176 if (error != 0) 177 goto out; 178 179 VN_RELE(startvp); 180 startvp = sdvp; 181 } 182 183 if ((filemode & (FREAD|FWRITE|FXATTRDIROPEN)) != 0) { 184 if ((filemode & (FNONBLOCK|FNDELAY)) == (FNONBLOCK|FNDELAY)) 185 filemode &= ~FNDELAY; 186 error = falloc((vnode_t *)NULL, filemode, &fp, &fd); 187 if (error == 0) { 188 if (audit_active) 189 audit_setfsat_path(1); 190 /* 191 * Last arg is a don't-care term if 192 * !(filemode & FCREAT). 193 */ 194 195 error = vn_openat(open_filename, seg, filemode, 196 (int)(createmode & MODEMASK), 197 &vp, CRCREAT, PTOU(curproc)->u_cmask, 198 startvp, fd); 199 200 if (startvp != NULL) 201 VN_RELE(startvp); 202 if (error == 0) { 203 if (audit_active) 204 audit_copen(fd, fp, vp); 205 if ((vp->v_flag & VDUP) == 0) { 206 fp->f_vnode = vp; 207 mutex_exit(&fp->f_tlock); 208 /* 209 * We must now fill in the slot 210 * falloc reserved. 211 */ 212 setf(fd, fp); 213 return (fd); 214 } else { 215 /* 216 * Special handling for /dev/fd. 217 * Give up the file pointer 218 * and dup the indicated file descriptor 219 * (in v_rdev). This is ugly, but I've 220 * seen worse. 221 */ 222 unfalloc(fp); 223 dupfd = getminor(vp->v_rdev); 224 type = vp->v_type; 225 mutex_enter(&vp->v_lock); 226 vp->v_flag &= ~VDUP; 227 mutex_exit(&vp->v_lock); 228 VN_RELE(vp); 229 if (type != VCHR) 230 return (set_errno(EINVAL)); 231 if ((fp = getf(dupfd)) == NULL) { 232 setf(fd, NULL); 233 return (set_errno(EBADF)); 234 } 235 mutex_enter(&fp->f_tlock); 236 fp->f_count++; 237 mutex_exit(&fp->f_tlock); 238 setf(fd, fp); 239 releasef(dupfd); 240 } 241 return (fd); 242 } else { 243 setf(fd, NULL); 244 unfalloc(fp); 245 return (set_errno(error)); 246 } 247 } 248 } else { 249 error = EINVAL; 250 } 251 out: 252 if (startvp != NULL) 253 VN_RELE(startvp); 254 return (set_errno(error)); 255 } 256 257 #define OPENMODE32(fmode) ((int)((fmode)-FOPEN)) 258 #define CREATMODE32 (FWRITE|FCREAT|FTRUNC) 259 #define OPENMODE64(fmode) (OPENMODE32(fmode) | FOFFMAX) 260 #define OPENMODEATTRDIR FXATTRDIROPEN 261 #define CREATMODE64 (CREATMODE32 | FOFFMAX) 262 #ifdef _LP64 263 #define OPENMODE(fmode) OPENMODE64(fmode) 264 #define CREATMODE CREATMODE64 265 #else 266 #define OPENMODE OPENMODE32 267 #define CREATMODE CREATMODE32 268 #endif 269 270 /* 271 * Open a file. 272 */ 273 int 274 open(char *fname, int fmode, int cmode) 275 { 276 return (copen(AT_FDCWD, fname, OPENMODE(fmode), cmode)); 277 } 278 279 /* 280 * Create a file. 281 */ 282 int 283 creat(char *fname, int cmode) 284 { 285 return (copen(AT_FDCWD, fname, CREATMODE, cmode)); 286 } 287 288 int 289 openat(int fd, char *path, int fmode, int cmode) 290 { 291 return (copen(fd, path, OPENMODE(fmode), cmode)); 292 } 293 294 #if defined(_ILP32) || defined(_SYSCALL32_IMPL) 295 /* 296 * Open and Creat for large files in 32-bit environment. Sets the FOFFMAX flag. 297 */ 298 int 299 open64(char *fname, int fmode, int cmode) 300 { 301 return (copen(AT_FDCWD, fname, OPENMODE64(fmode), cmode)); 302 } 303 304 int 305 creat64(char *fname, int cmode) 306 { 307 return (copen(AT_FDCWD, fname, CREATMODE64, cmode)); 308 } 309 310 int 311 openat64(int fd, char *path, int fmode, int cmode) 312 { 313 return (copen(fd, path, OPENMODE64(fmode), cmode)); 314 } 315 316 #endif /* _ILP32 || _SYSCALL32_IMPL */ 317 318 #ifdef _SYSCALL32_IMPL 319 /* 320 * Open and Creat for 32-bit compatibility on 64-bit kernel 321 */ 322 int 323 open32(char *fname, int fmode, int cmode) 324 { 325 return (copen(AT_FDCWD, fname, OPENMODE32(fmode), cmode)); 326 } 327 328 int 329 creat32(char *fname, int cmode) 330 { 331 return (copen(AT_FDCWD, fname, CREATMODE32, cmode)); 332 } 333 334 int 335 openat32(int fd, char *path, int fmode, int cmode) 336 { 337 return (copen(fd, path, OPENMODE32(fmode), cmode)); 338 } 339 340 #endif /* _SYSCALL32_IMPL */ 341 342 /* 343 * Special interface to open hidden attribute directory. 344 */ 345 int 346 openattrdirat(int fd, char *fname) 347 { 348 return (copen(fd, fname, OPENMODEATTRDIR, 0)); 349 } 350