vfs_syscalls_30.c revision 1.43
1 /* $NetBSD: vfs_syscalls_30.c,v 1.43 2021/09/07 11:43:02 riastradh 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 1.43 2021/09/07 11:43:02 riastradh Exp $"); 33 34 #if defined(_KERNEL_OPT) 35 #include "opt_compat_netbsd.h" 36 #endif 37 38 #include <sys/param.h> 39 #include <sys/systm.h> 40 #include <sys/namei.h> 41 #include <sys/filedesc.h> 42 #include <sys/kernel.h> 43 #include <sys/file.h> 44 #include <sys/stat.h> 45 #include <sys/socketvar.h> 46 #include <sys/vnode.h> 47 #include <sys/mount.h> 48 #include <sys/proc.h> 49 #include <sys/uio.h> 50 #include <sys/dirent.h> 51 #include <sys/malloc.h> 52 #include <sys/kauth.h> 53 #include <sys/vfs_syscalls.h> 54 #include <sys/syscall.h> 55 #include <sys/syscallvar.h> 56 #include <sys/syscallargs.h> 57 58 #include <compat/common/compat_mod.h> 59 #include <compat/common/compat_util.h> 60 61 #include <compat/sys/stat.h> 62 #include <compat/sys/dirent.h> 63 #include <compat/sys/mount.h> 64 #include <compat/sys/statvfs.h> 65 66 static const struct syscall_package vfs_syscalls_30_syscalls[] = { 67 { SYS_compat_30___fhstat30, 0, (sy_call_t *)compat_30_sys___fhstat30 }, 68 { SYS_compat_30___fstat13, 0, (sy_call_t *)compat_30_sys___fstat13 }, 69 { SYS_compat_30___lstat13, 0, (sy_call_t *)compat_30_sys___lstat13 }, 70 { SYS_compat_30___stat13, 0, (sy_call_t *)compat_30_sys___stat13 }, 71 { SYS_compat_30_fhopen, 0, (sy_call_t *)compat_30_sys_fhopen }, 72 { SYS_compat_30_fhstat, 0, (sy_call_t *)compat_30_sys_fhstat }, 73 { SYS_compat_30_fhstatvfs1, 0, (sy_call_t *)compat_30_sys_fhstatvfs1 }, 74 { SYS_compat_30_getdents, 0, (sy_call_t *)compat_30_sys_getdents }, 75 { SYS_compat_30_getfh, 0, (sy_call_t *)compat_30_sys_getfh }, 76 { 0,0, NULL } 77 }; 78 79 /* 80 * Convert from a new to an old stat structure. 81 */ 82 static void 83 cvtstat(struct stat13 *ost, const struct stat *st) 84 { 85 86 /* Handle any padding. */ 87 memset(ost, 0, sizeof(*ost)); 88 ost->st_dev = st->st_dev; 89 ost->st_ino = (uint32_t)st->st_ino; 90 ost->st_mode = st->st_mode; 91 ost->st_nlink = st->st_nlink; 92 ost->st_uid = st->st_uid; 93 ost->st_gid = st->st_gid; 94 ost->st_rdev = st->st_rdev; 95 timespec_to_timespec50(&st->st_atimespec, &ost->st_atimespec); 96 timespec_to_timespec50(&st->st_mtimespec, &ost->st_mtimespec); 97 timespec_to_timespec50(&st->st_ctimespec, &ost->st_ctimespec); 98 timespec_to_timespec50(&st->st_birthtimespec, &ost->st_birthtimespec); 99 ost->st_size = st->st_size; 100 ost->st_blocks = st->st_blocks; 101 ost->st_blksize = st->st_blksize; 102 ost->st_flags = st->st_flags; 103 ost->st_gen = st->st_gen; 104 } 105 106 /* 107 * Get file status; this version follows links. 108 */ 109 /* ARGSUSED */ 110 int 111 compat_30_sys___stat13(struct lwp *l, 112 const struct compat_30_sys___stat13_args *uap, register_t *retval) 113 { 114 /* { 115 syscallarg(const char *) path; 116 syscallarg(struct stat13 *) ub; 117 } */ 118 struct stat sb; 119 struct stat13 osb; 120 int error; 121 122 error = do_sys_stat(SCARG(uap, path), FOLLOW, &sb); 123 if (error) 124 return error; 125 cvtstat(&osb, &sb); 126 return copyout(&osb, SCARG(uap, ub), sizeof(osb)); 127 } 128 129 130 /* 131 * Get file status; this version does not follow links. 132 */ 133 /* ARGSUSED */ 134 int 135 compat_30_sys___lstat13(struct lwp *l, 136 const struct compat_30_sys___lstat13_args *uap, register_t *retval) 137 { 138 /* { 139 syscallarg(const char *) path; 140 syscallarg(struct stat13 *) ub; 141 } */ 142 struct stat sb; 143 struct stat13 osb; 144 int error; 145 146 error = do_sys_stat(SCARG(uap, path), NOFOLLOW, &sb); 147 if (error) 148 return error; 149 cvtstat(&osb, &sb); 150 return copyout(&osb, SCARG(uap, ub), sizeof(osb)); 151 } 152 153 /* ARGSUSED */ 154 int 155 compat_30_sys_fhstat(struct lwp *l, 156 const struct compat_30_sys_fhstat_args *uap, register_t *retval) 157 { 158 /* { 159 syscallarg(const struct compat_30_fhandle *) fhp; 160 syscallarg(struct stat13 *) sb; 161 } */ 162 struct stat sb; 163 struct stat13 osb; 164 int error; 165 166 error = do_fhstat(l, SCARG(uap, fhp), sizeof(*SCARG(uap, fhp)), &sb); 167 if (error) 168 return error; 169 cvtstat(&osb, &sb); 170 return copyout(&osb, SCARG(uap, sb), sizeof(osb)); 171 } 172 173 /* 174 * Return status information about a file descriptor. 175 */ 176 /* ARGSUSED */ 177 int 178 compat_30_sys___fstat13(struct lwp *l, 179 const struct compat_30_sys___fstat13_args *uap, register_t *retval) 180 { 181 /* { 182 syscallarg(int) fd; 183 syscallarg(struct stat13 *) sb; 184 } */ 185 struct stat sb; 186 struct stat13 osb; 187 int error; 188 189 error = do_sys_fstat(SCARG(uap, fd), &sb); 190 if (error) 191 return error; 192 cvtstat(&osb, &sb); 193 return copyout(&osb, SCARG(uap, sb), sizeof(osb)); 194 } 195 196 /* 197 * Read a block of directory entries in a file system independent format. 198 */ 199 int 200 compat_30_sys_getdents(struct lwp *l, 201 const struct compat_30_sys_getdents_args *uap, register_t *retval) 202 { 203 /* { 204 syscallarg(int) fd; 205 syscallarg(char *) buf; 206 syscallarg(size_t) count; 207 } */ 208 struct dirent *bdp; 209 struct vnode *vp; 210 char *inp, *tbuf; /* BSD-format */ 211 int len, reclen; /* BSD-format */ 212 char *outp; /* NetBSD-3.0-format */ 213 int resid; 214 struct file *fp; 215 struct uio auio; 216 struct iovec aiov; 217 struct dirent12 idb; 218 off_t off; /* true file offset */ 219 int buflen, error, eofflag; 220 off_t *cookiebuf = NULL, *cookie; 221 int ncookies; 222 223 /* fd_getvnode() will use the descriptor for us */ 224 if ((error = fd_getvnode(SCARG(uap, fd), &fp)) != 0) 225 return error; 226 227 if ((fp->f_flag & FREAD) == 0) { 228 error = EBADF; 229 goto out1; 230 } 231 232 vp = fp->f_vnode; 233 if (vp->v_type != VDIR) { 234 error = EINVAL; 235 goto out1; 236 } 237 238 buflen = uimin(MAXBSIZE, SCARG(uap, count)); 239 tbuf = malloc(buflen, M_TEMP, M_WAITOK); 240 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 241 off = fp->f_offset; 242 again: 243 aiov.iov_base = tbuf; 244 aiov.iov_len = buflen; 245 auio.uio_iov = &aiov; 246 auio.uio_iovcnt = 1; 247 auio.uio_rw = UIO_READ; 248 auio.uio_resid = buflen; 249 auio.uio_offset = off; 250 UIO_SETUP_SYSSPACE(&auio); 251 /* 252 * First we read into the malloc'ed buffer, then 253 * we massage it into user space, one record at a time. 254 */ 255 error = VOP_READDIR(vp, &auio, fp->f_cred, &eofflag, &cookiebuf, 256 &ncookies); 257 if (error) 258 goto out; 259 260 inp = tbuf; 261 outp = SCARG(uap, buf); 262 resid = SCARG(uap, count); 263 if ((len = buflen - auio.uio_resid) == 0) 264 goto eof; 265 266 for (cookie = cookiebuf; len > 0; len -= reclen) { 267 bdp = (struct dirent *)inp; 268 reclen = bdp->d_reclen; 269 if (reclen & _DIRENT_ALIGN(bdp)) 270 panic("%s: bad reclen %d", __func__, reclen); 271 if (cookie) 272 off = *cookie++; /* each entry points to the next */ 273 else 274 off += reclen; 275 if ((off >> 32) != 0) { 276 compat_offseterr(vp, "netbsd30_getdents"); 277 error = EINVAL; 278 goto out; 279 } 280 memset(&idb, 0, sizeof(idb)); 281 if (bdp->d_namlen >= sizeof(idb.d_name)) 282 idb.d_namlen = sizeof(idb.d_name) - 1; 283 else 284 idb.d_namlen = bdp->d_namlen; 285 idb.d_reclen = _DIRENT_SIZE(&idb); 286 if (reclen > len || resid < idb.d_reclen) { 287 /* entry too big for buffer, so just stop */ 288 outp++; 289 break; 290 } 291 /* 292 * Massage in place to make a NetBSD-3.0-shaped dirent 293 * (otherwise we have to worry about touching user memory 294 * outside of the copyout() call). 295 */ 296 idb.d_fileno = (u_int32_t)bdp->d_fileno; 297 idb.d_type = bdp->d_type; 298 (void)memcpy(idb.d_name, bdp->d_name, idb.d_namlen); 299 memset(idb.d_name + idb.d_namlen, 0, 300 idb.d_reclen - _DIRENT_NAMEOFF(&idb) - idb.d_namlen); 301 if ((error = copyout(&idb, outp, idb.d_reclen)) != 0) 302 goto out; 303 /* advance past this real entry */ 304 inp += reclen; 305 /* advance output past NetBSD-3.0-shaped entry */ 306 outp += idb.d_reclen; 307 resid -= idb.d_reclen; 308 } 309 310 /* if we squished out the whole block, try again */ 311 if (outp == SCARG(uap, buf)) { 312 if (cookiebuf) 313 free(cookiebuf, M_TEMP); 314 cookiebuf = NULL; 315 goto again; 316 } 317 fp->f_offset = off; /* update the vnode offset */ 318 319 eof: 320 *retval = SCARG(uap, count) - resid; 321 out: 322 VOP_UNLOCK(vp); 323 if (cookiebuf) 324 free(cookiebuf, M_TEMP); 325 free(tbuf, M_TEMP); 326 out1: 327 fd_putfile(SCARG(uap, fd)); 328 return error; 329 } 330 331 /* 332 * Get file handle system call 333 */ 334 int 335 compat_30_sys_getfh(struct lwp *l, const struct compat_30_sys_getfh_args *uap, 336 register_t *retval) 337 { 338 /* { 339 syscallarg(char *) fname; 340 syscallarg(struct compat_30_fhandle *) fhp; 341 } */ 342 struct vnode *vp; 343 struct compat_30_fhandle fh; 344 int error; 345 struct pathbuf *pb; 346 struct nameidata nd; 347 size_t sz; 348 349 /* 350 * Must be super user 351 */ 352 error = kauth_authorize_system(l->l_cred, KAUTH_SYSTEM_FILEHANDLE, 353 0, NULL, NULL, NULL); 354 if (error) 355 return (error); 356 357 error = pathbuf_copyin(SCARG(uap, fname), &pb); 358 if (error) { 359 return error; 360 } 361 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF | TRYEMULROOT, pb); 362 error = namei(&nd); 363 pathbuf_destroy(pb); 364 if (error) 365 return error; 366 vp = nd.ni_vp; 367 368 sz = sizeof(struct compat_30_fhandle); 369 error = vfs_composefh(vp, (void *)&fh, &sz); 370 vput(vp); 371 CTASSERT(FHANDLE_SIZE_COMPAT == sizeof(struct compat_30_fhandle)); 372 if (sz != FHANDLE_SIZE_COMPAT) { 373 error = EINVAL; 374 } 375 if (error) 376 return error; 377 return copyout(&fh, SCARG(uap, fhp), sizeof(fh)); 378 } 379 380 /* 381 * Open a file given a file handle. 382 * 383 * Check permissions, allocate an open file structure, 384 * and call the device open routine if any. 385 */ 386 int 387 compat_30_sys_fhopen(struct lwp *l, 388 const struct compat_30_sys_fhopen_args *uap, register_t *retval) 389 { 390 /* { 391 syscallarg(const fhandle_t *) fhp; 392 syscallarg(int) flags; 393 } */ 394 395 return dofhopen(l, SCARG(uap, fhp), FHANDLE_SIZE_COMPAT, 396 SCARG(uap, flags), retval); 397 } 398 399 /* ARGSUSED */ 400 int 401 compat_30_sys___fhstat30(struct lwp *l, 402 const struct compat_30_sys___fhstat30_args *uap_30, register_t *retval) 403 { 404 /* { 405 syscallarg(const fhandle_t *) fhp; 406 syscallarg(struct stat30 *) sb; 407 } */ 408 struct stat sb; 409 struct stat13 osb; 410 int error; 411 412 error = do_fhstat(l, SCARG(uap_30, fhp), FHANDLE_SIZE_COMPAT, &sb); 413 if (error) 414 return error; 415 cvtstat(&osb, &sb); 416 return copyout(&osb, SCARG(uap_30, sb), sizeof(osb)); 417 } 418 419 /* ARGSUSED */ 420 int 421 compat_30_sys_fhstatvfs1(struct lwp *l, 422 const struct compat_30_sys_fhstatvfs1_args *uap, register_t *retval) 423 { 424 /* { 425 syscallarg(const fhandle_t *) fhp; 426 syscallarg(struct statvfs90 *) buf; 427 syscallarg(int) flags; 428 } */ 429 struct statvfs *sb = STATVFSBUF_GET(); 430 int error = do_fhstatvfs(l, SCARG(uap, fhp), FHANDLE_SIZE_COMPAT, 431 sb, SCARG(uap, flags)); 432 433 if (!error) { 434 error = statvfs_to_statvfs90_copy(sb, SCARG(uap, buf), 435 sizeof(struct statvfs90)); 436 } 437 438 STATVFSBUF_PUT(sb); 439 440 return error; 441 } 442 443 int 444 vfs_syscalls_30_init(void) 445 { 446 447 return syscall_establish(NULL, vfs_syscalls_30_syscalls); 448 } 449 450 int 451 vfs_syscalls_30_fini(void) 452 { 453 454 return syscall_disestablish(NULL, vfs_syscalls_30_syscalls); 455 } 456
Indexes created Sat Sep 27 14:09:57 GMT 2025