1 /* $NetBSD: vfs_syscalls_12.c,v 1.38 2021/09/07 11:43:02 riastradh Exp $ */
2
3 /*
4 * Copyright (c) 1989, 1993
5 * The Regents of the University of California. All rights reserved.
6 * (c) UNIX System Laboratories, Inc.
7 * All or some portions of this file are derived from material licensed
8 * to the University of California by American Telephone and Telegraph
9 * Co. or Unix System Laboratories, Inc. and are reproduced herein with
10 * the permission of UNIX System Laboratories, Inc.
11 *
12 * Redistribution and use in source and binary forms, with or without
13 * modification, are permitted provided that the following conditions
14 * are met:
15 * 1. Redistributions of source code must retain the above copyright
16 * notice, this list of conditions and the following disclaimer.
17 * 2. Redistributions in binary form must reproduce the above copyright
18 * notice, this list of conditions and the following disclaimer in the
19 * documentation and/or other materials provided with the distribution.
20 * 3. Neither the name of the University nor the names of its contributors
21 * may be used to endorse or promote products derived from this software
22 * without specific prior written permission.
23 *
24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 * SUCH DAMAGE.
35 *
36 * From: @(#)vfs_syscalls.c 8.28 (Berkeley) 12/10/94
37 */
38
39 #include <sys/cdefs.h>
40 __KERNEL_RCSID(0, "$NetBSD: vfs_syscalls_12.c,v 1.38 2021/09/07 11:43:02 riastradh Exp $");
41
42 #if defined(_KERNEL_OPT)
43 #include "opt_compat_netbsd.h"
44 #endif
45
46 #include <sys/param.h>
47 #include <sys/systm.h>
48 #include <sys/namei.h>
49 #include <sys/filedesc.h>
50 #include <sys/kernel.h>
51 #include <sys/file.h>
52 #include <sys/stat.h>
53 #include <sys/socketvar.h>
54 #include <sys/vnode.h>
55 #include <sys/proc.h>
56 #include <sys/uio.h>
57 #include <sys/dirent.h>
58 #include <sys/vfs_syscalls.h>
59
60 #include <sys/syscall.h>
61 #include <sys/syscallvar.h>
62 #include <sys/syscallargs.h>
63
64 #include <compat/sys/stat.h>
65 #include <compat/sys/dirent.h>
66
67 #include <compat/common/compat_mod.h>
68
69 static const struct syscall_package vfs_syscalls_12_syscalls[] = {
70 { SYS_compat_12_fstat12, 0, (sy_call_t *)compat_12_sys_fstat },
71 { SYS_compat_12_getdirentries, 0,
72 (sy_call_t *)compat_12_sys_getdirentries },
73 { SYS_compat_12_lstat12, 0, (sy_call_t *)compat_12_sys_lstat },
74 { SYS_compat_12_stat12, 0, (sy_call_t *)compat_12_sys_stat },
75 { 0, 0, NULL }
76 };
77
78 /*
79 * Convert from a new to an old stat structure.
80 */
81 void
compat_12_stat_conv(const struct stat * st,struct stat12 * ost)82 compat_12_stat_conv(const struct stat *st, struct stat12 *ost)
83 {
84
85 memset(ost, 0, sizeof(*ost));
86 ost->st_dev = st->st_dev;
87 ost->st_ino = st->st_ino;
88 ost->st_mode = st->st_mode & 0xffff;
89 if (st->st_nlink >= (1 << 15))
90 ost->st_nlink = (1 << 15) - 1;
91 else
92 ost->st_nlink = st->st_nlink;
93 ost->st_uid = st->st_uid;
94 ost->st_gid = st->st_gid;
95 ost->st_rdev = st->st_rdev;
96 timespec_to_timespec50(&st->st_atimespec, &ost->st_atimespec);
97 timespec_to_timespec50(&st->st_mtimespec, &ost->st_mtimespec);
98 timespec_to_timespec50(&st->st_ctimespec, &ost->st_ctimespec);
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 * Read a block of directory entries in a file system independent format.
108 */
109 int
compat_12_sys_getdirentries(struct lwp * l,const struct compat_12_sys_getdirentries_args * uap,register_t * retval)110 compat_12_sys_getdirentries(struct lwp *l,
111 const struct compat_12_sys_getdirentries_args *uap, register_t *retval)
112 {
113 /* {
114 syscallarg(int) fd;
115 syscallarg(char *) buf;
116 syscallarg(u_int) count;
117 syscallarg(long *) basep;
118 } */
119 struct dirent *bdp;
120 struct vnode *vp;
121 char *inp, *tbuf; /* Current-format */
122 int len, reclen; /* Current-format */
123 char *outp; /* Dirent12-format */
124 int resid, old_reclen = 0; /* Dirent12-format */
125 struct file *fp;
126 struct uio auio;
127 struct iovec aiov;
128 struct dirent12 idb;
129 off_t off; /* true file offset */
130 int buflen, error, eofflag, nbytes;
131 struct vattr va;
132 off_t *cookiebuf = NULL, *cookie;
133 int ncookies;
134 long loff;
135
136 /* fd_getvnode() will use the descriptor for us */
137 if ((error = fd_getvnode(SCARG(uap, fd), &fp)) != 0)
138 return (error);
139
140 if ((fp->f_flag & FREAD) == 0) {
141 error = EBADF;
142 goto out1;
143 }
144
145 vp = (struct vnode *)fp->f_vnode;
146 if (vp->v_type != VDIR) {
147 error = ENOTDIR;
148 goto out1;
149 }
150
151 vn_lock(vp, LK_SHARED | LK_RETRY);
152 error = VOP_GETATTR(vp, &va, l->l_cred);
153 VOP_UNLOCK(vp);
154 if (error)
155 goto out1;
156
157 loff = fp->f_offset;
158 nbytes = SCARG(uap, count);
159 buflen = uimin(MAXBSIZE, nbytes);
160 if (buflen < va.va_blocksize)
161 buflen = va.va_blocksize;
162 tbuf = malloc(buflen, M_TEMP, M_WAITOK);
163
164 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
165 off = fp->f_offset;
166 again:
167 aiov.iov_base = tbuf;
168 aiov.iov_len = buflen;
169 auio.uio_iov = &aiov;
170 auio.uio_iovcnt = 1;
171 auio.uio_rw = UIO_READ;
172 auio.uio_resid = buflen;
173 auio.uio_offset = off;
174 UIO_SETUP_SYSSPACE(&auio);
175 /*
176 * First we read into the malloc'ed buffer, then
177 * we massage it into user space, one record at a time.
178 */
179 error = VOP_READDIR(vp, &auio, fp->f_cred, &eofflag, &cookiebuf,
180 &ncookies);
181 if (error)
182 goto out;
183
184 inp = tbuf;
185 outp = SCARG(uap, buf);
186 resid = nbytes;
187 if ((len = buflen - auio.uio_resid) == 0)
188 goto eof;
189
190 for (cookie = cookiebuf; len > 0; len -= reclen) {
191 bdp = (struct dirent *)inp;
192 reclen = bdp->d_reclen;
193 if (reclen & 3) {
194 error = EIO;
195 goto out;
196 }
197 if (bdp->d_fileno == 0) {
198 inp += reclen; /* it is a hole; squish it out */
199 if (cookie)
200 off = *cookie++;
201 else
202 off += reclen;
203 continue;
204 }
205 memset(&idb, 0, sizeof(idb));
206 if (bdp->d_namlen >= sizeof(idb.d_name))
207 idb.d_namlen = sizeof(idb.d_name) - 1;
208 else
209 idb.d_namlen = bdp->d_namlen;
210 old_reclen = _DIRENT_RECLEN(&idb, bdp->d_namlen);
211 if (reclen > len || resid < old_reclen) {
212 /* entry too big for buffer, so just stop */
213 outp++;
214 break;
215 }
216 /*
217 * Massage in place to make a Dirent12-shaped dirent (otherwise
218 * we have to worry about touching user memory outside of
219 * the copyout() call).
220 */
221 idb.d_fileno = (uint32_t)bdp->d_fileno;
222 idb.d_reclen = (uint16_t)old_reclen;
223 idb.d_type = (uint8_t)bdp->d_type;
224 (void)memcpy(idb.d_name, bdp->d_name, idb.d_namlen);
225 memset(idb.d_name + idb.d_namlen, 0,
226 idb.d_reclen - _DIRENT_NAMEOFF(&idb) - idb.d_namlen);
227 if ((error = copyout(&idb, outp, old_reclen)))
228 goto out;
229 /* advance past this real entry */
230 inp += reclen;
231 if (cookie)
232 off = *cookie++; /* each entry points to itself */
233 else
234 off += reclen;
235 /* advance output past Dirent12-shaped entry */
236 outp += old_reclen;
237 resid -= old_reclen;
238 }
239
240 /* if we squished out the whole block, try again */
241 if (outp == SCARG(uap, buf)) {
242 if (cookiebuf)
243 free(cookiebuf, M_TEMP);
244 cookiebuf = NULL;
245 goto again;
246 }
247 fp->f_offset = off; /* update the vnode offset */
248
249 eof:
250 *retval = nbytes - resid;
251 out:
252 VOP_UNLOCK(vp);
253 if (cookiebuf)
254 free(cookiebuf, M_TEMP);
255 free(tbuf, M_TEMP);
256 out1:
257 fd_putfile(SCARG(uap, fd));
258 if (error)
259 return error;
260 return copyout(&loff, SCARG(uap, basep), sizeof(long));
261 }
262
263 /*
264 * Get file status; this version follows links.
265 */
266 /* ARGSUSED */
267 int
compat_12_sys_stat(struct lwp * l,const struct compat_12_sys_stat_args * uap,register_t * retval)268 compat_12_sys_stat(struct lwp *l, const struct compat_12_sys_stat_args *uap,
269 register_t *retval)
270 {
271 /* {
272 syscallarg(const char *) path;
273 syscallarg(struct stat12 *) ub;
274 } */
275 struct stat sb;
276 struct stat12 osb;
277 int error;
278
279 error = do_sys_stat(SCARG(uap, path), FOLLOW, &sb);
280 if (error)
281 return (error);
282 compat_12_stat_conv(&sb, &osb);
283 error = copyout(&osb, SCARG(uap, ub), sizeof (osb));
284 return (error);
285 }
286
287
288 /*
289 * Get file status; this version does not follow links.
290 */
291 /* ARGSUSED */
292 int
compat_12_sys_lstat(struct lwp * l,const struct compat_12_sys_lstat_args * uap,register_t * retval)293 compat_12_sys_lstat(struct lwp *l, const struct compat_12_sys_lstat_args *uap,
294 register_t *retval)
295 {
296 /* {
297 syscallarg(const char *) path;
298 syscallarg(struct stat12 *) ub;
299 } */
300 struct stat sb;
301 struct stat12 osb;
302 int error;
303
304 error = do_sys_stat(SCARG(uap, path), NOFOLLOW, &sb);
305 if (error)
306 return (error);
307 compat_12_stat_conv(&sb, &osb);
308 error = copyout(&osb, SCARG(uap, ub), sizeof (osb));
309 return (error);
310 }
311
312 /*
313 * Return status information about a file descriptor.
314 */
315 /* ARGSUSED */
316 int
compat_12_sys_fstat(struct lwp * l,const struct compat_12_sys_fstat_args * uap,register_t * retval)317 compat_12_sys_fstat(struct lwp *l, const struct compat_12_sys_fstat_args *uap,
318 register_t *retval)
319 {
320 /* {
321 syscallarg(int) fd;
322 syscallarg(struct stat12 *) sb;
323 } */
324 struct stat ub;
325 struct stat12 oub;
326 int error;
327
328 error = do_sys_fstat(SCARG(uap, fd), &ub);
329 if (error == 0) {
330 compat_12_stat_conv(&ub, &oub);
331 error = copyout(&oub, SCARG(uap, sb), sizeof (oub));
332 }
333 return (error);
334 }
335
336 int
vfs_syscalls_12_init(void)337 vfs_syscalls_12_init(void)
338 {
339
340 return syscall_establish(NULL, vfs_syscalls_12_syscalls);
341 }
342
343 int
vfs_syscalls_12_fini(void)344 vfs_syscalls_12_fini(void)
345 {
346
347 return syscall_disestablish(NULL, vfs_syscalls_12_syscalls);
348 }
349