| 1 | /* $NetBSD: vfs_syscalls_30.c,v 1.36 2014/10/20 11:58:01 christos Exp $ */ |
| 2 | |
| 3 | /*- |
| 4 | * Copyright (c) 2005, 2008 The NetBSD Foundation, Inc. |
| 5 | * All rights reserved. |
| 6 | * |
| 7 | * This code is derived from software contributed to The NetBSD Foundation |
| 8 | * by Christos Zoulas. |
| 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 | * |
| 19 | * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS |
| 20 | * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED |
| 21 | * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
| 22 | * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS |
| 23 | * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
| 24 | * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
| 25 | * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
| 26 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
| 27 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
| 28 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
| 29 | * POSSIBILITY OF SUCH DAMAGE. |
| 30 | */ |
| 31 | #include <sys/cdefs.h> |
| 32 | __KERNEL_RCSID(0, "$NetBSD: vfs_syscalls_30.c,v 1.36 2014/10/20 11:58:01 christos Exp $" ); |
| 33 | |
| 34 | #include <sys/param.h> |
| 35 | #include <sys/systm.h> |
| 36 | #include <sys/namei.h> |
| 37 | #include <sys/filedesc.h> |
| 38 | #include <sys/kernel.h> |
| 39 | #include <sys/file.h> |
| 40 | #include <sys/stat.h> |
| 41 | #include <sys/socketvar.h> |
| 42 | #include <sys/vnode.h> |
| 43 | #include <sys/mount.h> |
| 44 | #include <sys/proc.h> |
| 45 | #include <sys/uio.h> |
| 46 | #include <sys/dirent.h> |
| 47 | #include <sys/malloc.h> |
| 48 | #include <sys/kauth.h> |
| 49 | #include <sys/vfs_syscalls.h> |
| 50 | |
| 51 | #include <sys/syscallargs.h> |
| 52 | |
| 53 | #include <compat/common/compat_util.h> |
| 54 | #include <compat/sys/stat.h> |
| 55 | #include <compat/sys/dirent.h> |
| 56 | #include <compat/sys/mount.h> |
| 57 | |
| 58 | static void cvtstat(struct stat13 *, const struct stat *); |
| 59 | |
| 60 | /* |
| 61 | * Convert from a new to an old stat structure. |
| 62 | */ |
| 63 | static void |
| 64 | cvtstat(struct stat13 *ost, const struct stat *st) |
| 65 | { |
| 66 | |
| 67 | ost->st_dev = st->st_dev; |
| 68 | ost->st_ino = (uint32_t)st->st_ino; |
| 69 | ost->st_mode = st->st_mode; |
| 70 | ost->st_nlink = st->st_nlink; |
| 71 | ost->st_uid = st->st_uid; |
| 72 | ost->st_gid = st->st_gid; |
| 73 | ost->st_rdev = st->st_rdev; |
| 74 | timespec_to_timespec50(&st->st_atimespec, &ost->st_atimespec); |
| 75 | timespec_to_timespec50(&st->st_mtimespec, &ost->st_mtimespec); |
| 76 | timespec_to_timespec50(&st->st_ctimespec, &ost->st_ctimespec); |
| 77 | timespec_to_timespec50(&st->st_birthtimespec, &ost->st_birthtimespec); |
| 78 | ost->st_size = st->st_size; |
| 79 | ost->st_blocks = st->st_blocks; |
| 80 | ost->st_blksize = st->st_blksize; |
| 81 | ost->st_flags = st->st_flags; |
| 82 | ost->st_gen = st->st_gen; |
| 83 | } |
| 84 | |
| 85 | /* |
| 86 | * Get file status; this version follows links. |
| 87 | */ |
| 88 | /* ARGSUSED */ |
| 89 | int |
| 90 | compat_30_sys___stat13(struct lwp *l, const struct compat_30_sys___stat13_args *uap, register_t *retval) |
| 91 | { |
| 92 | /* { |
| 93 | syscallarg(const char *) path; |
| 94 | syscallarg(struct stat13 *) ub; |
| 95 | } */ |
| 96 | struct stat sb; |
| 97 | struct stat13 osb; |
| 98 | int error; |
| 99 | |
| 100 | error = do_sys_stat(SCARG(uap, path), FOLLOW, &sb); |
| 101 | if (error) |
| 102 | return error; |
| 103 | cvtstat(&osb, &sb); |
| 104 | error = copyout(&osb, SCARG(uap, ub), sizeof (osb)); |
| 105 | return error; |
| 106 | } |
| 107 | |
| 108 | |
| 109 | /* |
| 110 | * Get file status; this version does not follow links. |
| 111 | */ |
| 112 | /* ARGSUSED */ |
| 113 | int |
| 114 | compat_30_sys___lstat13(struct lwp *l, const struct compat_30_sys___lstat13_args *uap, register_t *retval) |
| 115 | { |
| 116 | /* { |
| 117 | syscallarg(const char *) path; |
| 118 | syscallarg(struct stat13 *) ub; |
| 119 | } */ |
| 120 | struct stat sb; |
| 121 | struct stat13 osb; |
| 122 | int error; |
| 123 | |
| 124 | error = do_sys_stat(SCARG(uap, path), NOFOLLOW, &sb); |
| 125 | if (error) |
| 126 | return error; |
| 127 | cvtstat(&osb, &sb); |
| 128 | error = copyout(&osb, SCARG(uap, ub), sizeof (osb)); |
| 129 | return error; |
| 130 | } |
| 131 | |
| 132 | /* ARGSUSED */ |
| 133 | int |
| 134 | compat_30_sys_fhstat(struct lwp *l, const struct compat_30_sys_fhstat_args *uap, register_t *retval) |
| 135 | { |
| 136 | /* { |
| 137 | syscallarg(const struct compat_30_fhandle *) fhp; |
| 138 | syscallarg(struct stat13 *) sb; |
| 139 | } */ |
| 140 | struct stat sb; |
| 141 | struct stat13 osb; |
| 142 | int error; |
| 143 | struct compat_30_fhandle fh; |
| 144 | struct mount *mp; |
| 145 | struct vnode *vp; |
| 146 | |
| 147 | /* |
| 148 | * Must be super user |
| 149 | */ |
| 150 | if ((error = kauth_authorize_system(l->l_cred, KAUTH_SYSTEM_FILEHANDLE, |
| 151 | 0, NULL, NULL, NULL))) |
| 152 | return (error); |
| 153 | |
| 154 | if ((error = copyin(SCARG(uap, fhp), &fh, sizeof(fh))) != 0) |
| 155 | return (error); |
| 156 | |
| 157 | if ((mp = vfs_getvfs(&fh.fh_fsid)) == NULL) |
| 158 | return (ESTALE); |
| 159 | if (mp->mnt_op->vfs_fhtovp == NULL) |
| 160 | return EOPNOTSUPP; |
| 161 | if ((error = VFS_FHTOVP(mp, (struct fid*)&fh.fh_fid, &vp))) |
| 162 | return (error); |
| 163 | error = vn_stat(vp, &sb); |
| 164 | vput(vp); |
| 165 | if (error) |
| 166 | return (error); |
| 167 | cvtstat(&osb, &sb); |
| 168 | error = copyout(&osb, SCARG(uap, sb), sizeof(sb)); |
| 169 | return (error); |
| 170 | } |
| 171 | |
| 172 | /* |
| 173 | * Return status information about a file descriptor. |
| 174 | */ |
| 175 | /* ARGSUSED */ |
| 176 | int |
| 177 | compat_30_sys___fstat13(struct lwp *l, const struct compat_30_sys___fstat13_args *uap, register_t *retval) |
| 178 | { |
| 179 | /* { |
| 180 | syscallarg(int) fd; |
| 181 | syscallarg(struct stat13 *) sb; |
| 182 | } */ |
| 183 | struct stat sb; |
| 184 | struct stat13 osb; |
| 185 | int error; |
| 186 | |
| 187 | error = do_sys_fstat(SCARG(uap, fd), &sb); |
| 188 | if (error) |
| 189 | return error; |
| 190 | cvtstat(&osb, &sb); |
| 191 | error = copyout(&osb, SCARG(uap, sb), sizeof (osb)); |
| 192 | return error; |
| 193 | } |
| 194 | |
| 195 | /* |
| 196 | * Read a block of directory entries in a file system independent format. |
| 197 | */ |
| 198 | int |
| 199 | compat_30_sys_getdents(struct lwp *l, const struct compat_30_sys_getdents_args *uap, register_t *retval) |
| 200 | { |
| 201 | /* { |
| 202 | syscallarg(int) fd; |
| 203 | syscallarg(char *) buf; |
| 204 | syscallarg(size_t) count; |
| 205 | } */ |
| 206 | struct dirent *bdp; |
| 207 | struct vnode *vp; |
| 208 | char *inp, *tbuf; /* BSD-format */ |
| 209 | int len, reclen; /* BSD-format */ |
| 210 | char *outp; /* NetBSD-3.0-format */ |
| 211 | int resid; |
| 212 | struct file *fp; |
| 213 | struct uio auio; |
| 214 | struct iovec aiov; |
| 215 | struct dirent12 idb; |
| 216 | off_t off; /* true file offset */ |
| 217 | int buflen, error, eofflag; |
| 218 | off_t *cookiebuf = NULL, *cookie; |
| 219 | int ncookies; |
| 220 | |
| 221 | /* fd_getvnode() will use the descriptor for us */ |
| 222 | if ((error = fd_getvnode(SCARG(uap, fd), &fp)) != 0) |
| 223 | return error; |
| 224 | |
| 225 | if ((fp->f_flag & FREAD) == 0) { |
| 226 | error = EBADF; |
| 227 | goto out1; |
| 228 | } |
| 229 | |
| 230 | vp = fp->f_vnode; |
| 231 | if (vp->v_type != VDIR) { |
| 232 | error = EINVAL; |
| 233 | goto out1; |
| 234 | } |
| 235 | |
| 236 | buflen = min(MAXBSIZE, SCARG(uap, count)); |
| 237 | tbuf = malloc(buflen, M_TEMP, M_WAITOK); |
| 238 | vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); |
| 239 | off = fp->f_offset; |
| 240 | again: |
| 241 | aiov.iov_base = tbuf; |
| 242 | aiov.iov_len = buflen; |
| 243 | auio.uio_iov = &aiov; |
| 244 | auio.uio_iovcnt = 1; |
| 245 | auio.uio_rw = UIO_READ; |
| 246 | auio.uio_resid = buflen; |
| 247 | auio.uio_offset = off; |
| 248 | UIO_SETUP_SYSSPACE(&auio); |
| 249 | /* |
| 250 | * First we read into the malloc'ed buffer, then |
| 251 | * we massage it into user space, one record at a time. |
| 252 | */ |
| 253 | error = VOP_READDIR(vp, &auio, fp->f_cred, &eofflag, &cookiebuf, |
| 254 | &ncookies); |
| 255 | if (error) |
| 256 | goto out; |
| 257 | |
| 258 | inp = tbuf; |
| 259 | outp = SCARG(uap, buf); |
| 260 | resid = SCARG(uap, count); |
| 261 | if ((len = buflen - auio.uio_resid) == 0) |
| 262 | goto eof; |
| 263 | |
| 264 | for (cookie = cookiebuf; len > 0; len -= reclen) { |
| 265 | bdp = (struct dirent *)inp; |
| 266 | reclen = bdp->d_reclen; |
| 267 | if (reclen & _DIRENT_ALIGN(bdp)) |
| 268 | panic("netbsd30_getdents: bad reclen %d" , reclen); |
| 269 | if (cookie) |
| 270 | off = *cookie++; /* each entry points to the next */ |
| 271 | else |
| 272 | off += reclen; |
| 273 | if ((off >> 32) != 0) { |
| 274 | compat_offseterr(vp, "netbsd30_getdents" ); |
| 275 | error = EINVAL; |
| 276 | goto out; |
| 277 | } |
| 278 | if (bdp->d_namlen >= sizeof(idb.d_name)) |
| 279 | idb.d_namlen = sizeof(idb.d_name) - 1; |
| 280 | else |
| 281 | idb.d_namlen = bdp->d_namlen; |
| 282 | idb.d_reclen = _DIRENT_SIZE(&idb); |
| 283 | if (reclen > len || resid < idb.d_reclen) { |
| 284 | /* entry too big for buffer, so just stop */ |
| 285 | outp++; |
| 286 | break; |
| 287 | } |
| 288 | /* |
| 289 | * Massage in place to make a NetBSD-3.0-shaped dirent |
| 290 | * (otherwise we have to worry about touching user memory |
| 291 | * outside of the copyout() call). |
| 292 | */ |
| 293 | idb.d_fileno = (u_int32_t)bdp->d_fileno; |
| 294 | idb.d_type = bdp->d_type; |
| 295 | (void)memcpy(idb.d_name, bdp->d_name, idb.d_namlen); |
| 296 | memset(idb.d_name + idb.d_namlen, 0, |
| 297 | idb.d_reclen - _DIRENT_NAMEOFF(&idb) - idb.d_namlen); |
| 298 | if ((error = copyout(&idb, outp, idb.d_reclen)) != 0) |
| 299 | goto out; |
| 300 | /* advance past this real entry */ |
| 301 | inp += reclen; |
| 302 | /* advance output past NetBSD-3.0-shaped entry */ |
| 303 | outp += idb.d_reclen; |
| 304 | resid -= idb.d_reclen; |
| 305 | } |
| 306 | |
| 307 | /* if we squished out the whole block, try again */ |
| 308 | if (outp == SCARG(uap, buf)) { |
| 309 | if (cookiebuf) |
| 310 | free(cookiebuf, M_TEMP); |
| 311 | cookiebuf = NULL; |
| 312 | goto again; |
| 313 | } |
| 314 | fp->f_offset = off; /* update the vnode offset */ |
| 315 | |
| 316 | eof: |
| 317 | *retval = SCARG(uap, count) - resid; |
| 318 | out: |
| 319 | VOP_UNLOCK(vp); |
| 320 | if (cookiebuf) |
| 321 | free(cookiebuf, M_TEMP); |
| 322 | free(tbuf, M_TEMP); |
| 323 | out1: |
| 324 | fd_putfile(SCARG(uap, fd)); |
| 325 | return error; |
| 326 | } |
| 327 | |
| 328 | /* |
| 329 | * Get file handle system call |
| 330 | */ |
| 331 | int |
| 332 | compat_30_sys_getfh(struct lwp *l, const struct compat_30_sys_getfh_args *uap, register_t *retval) |
| 333 | { |
| 334 | /* { |
| 335 | syscallarg(char *) fname; |
| 336 | syscallarg(struct compat_30_fhandle *) fhp; |
| 337 | } */ |
| 338 | struct vnode *vp; |
| 339 | struct compat_30_fhandle fh; |
| 340 | int error; |
| 341 | struct pathbuf *pb; |
| 342 | struct nameidata nd; |
| 343 | size_t sz; |
| 344 | |
| 345 | /* |
| 346 | * Must be super user |
| 347 | */ |
| 348 | error = kauth_authorize_system(l->l_cred, KAUTH_SYSTEM_FILEHANDLE, |
| 349 | 0, NULL, NULL, NULL); |
| 350 | if (error) |
| 351 | return (error); |
| 352 | |
| 353 | error = pathbuf_copyin(SCARG(uap, fname), &pb); |
| 354 | if (error) { |
| 355 | return error; |
| 356 | } |
| 357 | NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF | TRYEMULROOT, pb); |
| 358 | error = namei(&nd); |
| 359 | pathbuf_destroy(pb); |
| 360 | if (error) |
| 361 | return error; |
| 362 | vp = nd.ni_vp; |
| 363 | |
| 364 | sz = sizeof(struct compat_30_fhandle); |
| 365 | error = vfs_composefh(vp, (void *)&fh, &sz); |
| 366 | vput(vp); |
| 367 | if (sz != FHANDLE_SIZE_COMPAT) { |
| 368 | error = EINVAL; |
| 369 | } |
| 370 | if (error) |
| 371 | return (error); |
| 372 | error = copyout(&fh, SCARG(uap, fhp), sizeof(struct compat_30_fhandle)); |
| 373 | return (error); |
| 374 | } |
| 375 | |
| 376 | /* |
| 377 | * Open a file given a file handle. |
| 378 | * |
| 379 | * Check permissions, allocate an open file structure, |
| 380 | * and call the device open routine if any. |
| 381 | */ |
| 382 | int |
| 383 | compat_30_sys_fhopen(struct lwp *l, const struct compat_30_sys_fhopen_args *uap, register_t *retval) |
| 384 | { |
| 385 | /* { |
| 386 | syscallarg(const fhandle_t *) fhp; |
| 387 | syscallarg(int) flags; |
| 388 | } */ |
| 389 | |
| 390 | return dofhopen(l, SCARG(uap, fhp), FHANDLE_SIZE_COMPAT, |
| 391 | SCARG(uap, flags), retval); |
| 392 | } |
| 393 | |
| 394 | /* ARGSUSED */ |
| 395 | int |
| 396 | compat_30_sys___fhstat30(struct lwp *l, const struct compat_30_sys___fhstat30_args *uap_30, register_t *retval) |
| 397 | { |
| 398 | /* { |
| 399 | syscallarg(const fhandle_t *) fhp; |
| 400 | syscallarg(struct stat30 *) sb; |
| 401 | } */ |
| 402 | struct stat sb; |
| 403 | struct stat13 osb; |
| 404 | int error; |
| 405 | |
| 406 | error = do_fhstat(l, SCARG(uap_30, fhp), FHANDLE_SIZE_COMPAT, &sb); |
| 407 | if (error) |
| 408 | return error; |
| 409 | cvtstat(&osb, &sb); |
| 410 | error = copyout(&osb, SCARG(uap_30, sb), sizeof (osb)); |
| 411 | return error; |
| 412 | } |
| 413 | |
| 414 | /* ARGSUSED */ |
| 415 | int |
| 416 | compat_30_sys_fhstatvfs1(struct lwp *l, const struct compat_30_sys_fhstatvfs1_args *uap_30, register_t *retval) |
| 417 | { |
| 418 | /* { |
| 419 | syscallarg(const fhandle_t *) fhp; |
| 420 | syscallarg(struct statvfs *) buf; |
| 421 | syscallarg(int) flags; |
| 422 | } */ |
| 423 | struct sys___fhstatvfs140_args uap; |
| 424 | |
| 425 | SCARG(&uap, fhp) = SCARG(uap_30, fhp); |
| 426 | SCARG(&uap, fh_size) = FHANDLE_SIZE_COMPAT; |
| 427 | SCARG(&uap, buf) = SCARG(uap_30, buf); |
| 428 | SCARG(&uap, flags) = SCARG(uap_30, flags); |
| 429 | |
| 430 | return sys___fhstatvfs140(l, &uap, retval); |
| 431 | } |
| 432 | |