Programming Languages Research Group: Git - firefly-linux-kernel-4.4.55.git/blob

1 /*

2 * 32bit Socket syscall emulation. Based on arch/sparc64/kernel/sys_sparc32.c.

3 *

12 */

13

14 #include <linux/kernel.h>

15 #include <linux/gfp.h>

16 #include <linux/fs.h>

17 #include <linux/types.h>

18 #include <linux/file.h>

19 #include <linux/icmpv6.h>

20 #include <linux/socket.h>

21 #include <linux/syscalls.h>

22 #include <linux/filter.h>

23 #include <linux/compat.h>

24 #include <linux/security.h>

25

26 #include <net/scm.h>

27 #include <net/sock.h>

28 #include <net/ip.h>

29 #include <net/ipv6.h>

30 #include <asm/uaccess.h>

31 #include <net/compat.h>

32

33 static inline int iov_from_user_compat_to_kern(struct iovec *kiov,

34 struct compat_iovec __user *uiov32,

35 int niov)

36 {

37 int tot_len = 0;

38

39 while (niov > 0) {

40 compat_uptr_t buf;

41 compat_size_t len;

42

43 if (get_user(len, &uiov32->iov_len) ||

44 get_user(buf, &uiov32->iov_base)) {

45 tot_len = -EFAULT;

46 break;

47 }

48 tot_len += len;

49 kiov->iov_base = compat_ptr(buf);

50 kiov->iov_len = (__kernel_size_t) len;

51 uiov32++;

52 kiov++;

53 niov--;

54 }

55 return tot_len;

56 }

57

58 int get_compat_msghdr(struct msghdr *kmsg, struct compat_msghdr __user *umsg)

59 {

60 compat_uptr_t tmp1, tmp2, tmp3;

61

62 if (!access_ok(VERIFY_READ, umsg, sizeof(*umsg)) ||

63 __get_user(tmp1, &umsg->msg_name) ||

64 __get_user(kmsg->msg_namelen, &umsg->msg_namelen) ||

65 __get_user(tmp2, &umsg->msg_iov) ||

66 __get_user(kmsg->msg_iovlen, &umsg->msg_iovlen) ||

67 __get_user(tmp3, &umsg->msg_control) ||

68 __get_user(kmsg->msg_controllen, &umsg->msg_controllen) ||

69 __get_user(kmsg->msg_flags, &umsg->msg_flags))

70 return -EFAULT;

71 kmsg->msg_name = compat_ptr(tmp1);

72 kmsg->msg_iov = compat_ptr(tmp2);

73 kmsg->msg_control = compat_ptr(tmp3);

74 return 0;

75 }

76

77 /* I've named the args so it is easy to tell whose space the pointers are in. */

78 int verify_compat_iovec(struct msghdr *kern_msg, struct iovec *kern_iov,

79 struct sockaddr *kern_address, int mode)

80 {

81 int tot_len;

82

83 if (kern_msg->msg_namelen) {

84 if (mode == VERIFY_READ) {

85 int err = move_addr_to_kernel(kern_msg->msg_name,

86 kern_msg->msg_namelen,

87 kern_address);

88 if (err < 0)

89 return err;

90 }

91 kern_msg->msg_name = kern_address;

92 } else

93 kern_msg->msg_name = NULL;

94

95 tot_len = iov_from_user_compat_to_kern(kern_iov,

96 (struct compat_iovec __user *)kern_msg->msg_iov,

97 kern_msg->msg_iovlen);

98 if (tot_len >= 0)

99 kern_msg->msg_iov = kern_iov;

100

101 return tot_len;

102 }

103

104 /* Bleech... */

105 #define CMSG_COMPAT_ALIGN(len) ALIGN((len), sizeof(s32))

106

107 #define CMSG_COMPAT_DATA(cmsg) \

108 ((void __user *)((char __user *)(cmsg) + CMSG_COMPAT_ALIGN(sizeof(struct compat_cmsghdr))))

109 #define CMSG_COMPAT_SPACE(len) \

110 (CMSG_COMPAT_ALIGN(sizeof(struct compat_cmsghdr)) + CMSG_COMPAT_ALIGN(len))

111 #define CMSG_COMPAT_LEN(len) \

112 (CMSG_COMPAT_ALIGN(sizeof(struct compat_cmsghdr)) + (len))

113

114 #define CMSG_COMPAT_FIRSTHDR(msg) \

115 (((msg)->msg_controllen) >= sizeof(struct compat_cmsghdr) ? \

116 (struct compat_cmsghdr __user *)((msg)->msg_control) : \

117 (struct compat_cmsghdr __user *)NULL)

118

119 #define CMSG_COMPAT_OK(ucmlen, ucmsg, mhdr) \

120 ((ucmlen) >= sizeof(struct compat_cmsghdr) && \

121 (ucmlen) <= (unsigned long) \

122 ((mhdr)->msg_controllen - \

123 ((char *)(ucmsg) - (char *)(mhdr)->msg_control)))

124

125 static inline struct compat_cmsghdr __user *cmsg_compat_nxthdr(struct msghdr *msg,

126 struct compat_cmsghdr __user *cmsg, int cmsg_len)

127 {

128 char __user *ptr = (char __user *)cmsg + CMSG_COMPAT_ALIGN(cmsg_len);

129 if ((unsigned long)(ptr + 1 - (char __user *)msg->msg_control) >

130 msg->msg_controllen)

131 return NULL;

132 return (struct compat_cmsghdr __user *)ptr;

133 }

134

135 /* There is a lot of hair here because the alignment rules (and

136 * thus placement) of cmsg headers and length are different for

137 * 32-bit apps. -DaveM

138 */

139 int cmsghdr_from_user_compat_to_kern(struct msghdr *kmsg, struct sock *sk,

140 unsigned char *stackbuf, int stackbuf_size)

141 {

142 struct compat_cmsghdr __user *ucmsg;

143 struct cmsghdr *kcmsg, *kcmsg_base;

144 compat_size_t ucmlen;

145 __kernel_size_t kcmlen, tmp;

146 int err = -EFAULT;

147

148 kcmlen = 0;

149 kcmsg_base = kcmsg = (struct cmsghdr *)stackbuf;

150 ucmsg = CMSG_COMPAT_FIRSTHDR(kmsg);

151 while (ucmsg != NULL) {

152 if (get_user(ucmlen, &ucmsg->cmsg_len))

153 return -EFAULT;

154

155 /* Catch bogons. */

156 if (!CMSG_COMPAT_OK(ucmlen, ucmsg, kmsg))

157 return -EINVAL;

158

159 tmp = ((ucmlen - CMSG_COMPAT_ALIGN(sizeof(*ucmsg))) +

160 CMSG_ALIGN(sizeof(struct cmsghdr)));

161 tmp = CMSG_ALIGN(tmp);

162 kcmlen += tmp;

163 ucmsg = cmsg_compat_nxthdr(kmsg, ucmsg, ucmlen);

164 }

165 if (kcmlen == 0)

166 return -EINVAL;

167

168 /* The kcmlen holds the 64-bit version of the control length.

169 * It may not be modified as we do not stick it into the kmsg

170 * until we have successfully copied over all of the data

171 * from the user.

172 */

173 if (kcmlen > stackbuf_size)

174 kcmsg_base = kcmsg = sock_kmalloc(sk, kcmlen, GFP_KERNEL);

175 if (kcmsg == NULL)

176 return -ENOBUFS;

177

178 /* Now copy them over neatly. */

179 memset(kcmsg, 0, kcmlen);

180 ucmsg = CMSG_COMPAT_FIRSTHDR(kmsg);

181 while (ucmsg != NULL) {

182 if (__get_user(ucmlen, &ucmsg->cmsg_len))

183 goto Efault;

184 if (!CMSG_COMPAT_OK(ucmlen, ucmsg, kmsg))

185 goto Einval;

186 tmp = ((ucmlen - CMSG_COMPAT_ALIGN(sizeof(*ucmsg))) +

187 CMSG_ALIGN(sizeof(struct cmsghdr)));

188 if ((char *)kcmsg_base + kcmlen - (char *)kcmsg < CMSG_ALIGN(tmp))

189 goto Einval;

190 kcmsg->cmsg_len = tmp;

191 tmp = CMSG_ALIGN(tmp);

192 if (__get_user(kcmsg->cmsg_level, &ucmsg->cmsg_level) ||

193 __get_user(kcmsg->cmsg_type, &ucmsg->cmsg_type) ||

194 copy_from_user(CMSG_DATA(kcmsg),

195 CMSG_COMPAT_DATA(ucmsg),

196 (ucmlen - CMSG_COMPAT_ALIGN(sizeof(*ucmsg)))))

197 goto Efault;

198

199 /* Advance. */

200 kcmsg = (struct cmsghdr *)((char *)kcmsg + tmp);

201 ucmsg = cmsg_compat_nxthdr(kmsg, ucmsg, ucmlen);

202 }

203

204 /* Ok, looks like we made it. Hook it up and return success. */

205 kmsg->msg_control = kcmsg_base;

206 kmsg->msg_controllen = kcmlen;

207 return 0;

208

209 Einval:

210 err = -EINVAL;

211 Efault:

212 if (kcmsg_base != (struct cmsghdr *)stackbuf)

213 sock_kfree_s(sk, kcmsg_base, kcmlen);

214 return err;

215 }

216

217 int put_cmsg_compat(struct msghdr *kmsg, int level, int type, int len, void *data)

218 {

219 struct compat_timeval ctv;

220 struct compat_timespec cts[3];

221 struct compat_cmsghdr __user *cm = (struct compat_cmsghdr __user *) kmsg->msg_control;

222 struct compat_cmsghdr cmhdr;

223 int cmlen;

224

225 if (cm == NULL || kmsg->msg_controllen < sizeof(*cm)) {

226 kmsg->msg_flags |= MSG_CTRUNC;

227 return 0; /* XXX: return error? check spec. */

228 }

229

230 if (level == SOL_SOCKET && type == SCM_TIMESTAMP) {

231 struct timeval *tv = (struct timeval *)data;

232 ctv.tv_sec = tv->tv_sec;

233 ctv.tv_usec = tv->tv_usec;

234 data = &ctv;

235 len = sizeof(ctv);

236 }

237 if (level == SOL_SOCKET &&

238 (type == SCM_TIMESTAMPNS || type == SCM_TIMESTAMPING)) {

239 int count = type == SCM_TIMESTAMPNS ? 1 : 3;

240 int i;

241 struct timespec *ts = (struct timespec *)data;

242 for (i = 0; i < count; i++) {

243 cts[i].tv_sec = ts[i].tv_sec;

244 cts[i].tv_nsec = ts[i].tv_nsec;

245 }

246 data = &cts;

247 len = sizeof(cts[0]) * count;

248 }

249

250 cmlen = CMSG_COMPAT_LEN(len);

251 if (kmsg->msg_controllen < cmlen) {

252 kmsg->msg_flags |= MSG_CTRUNC;

253 cmlen = kmsg->msg_controllen;

254 }

255 cmhdr.cmsg_level = level;

256 cmhdr.cmsg_type = type;

257 cmhdr.cmsg_len = cmlen;

258

259 if (copy_to_user(cm, &cmhdr, sizeof cmhdr))

260 return -EFAULT;

261 if (copy_to_user(CMSG_COMPAT_DATA(cm), data, cmlen - sizeof(struct compat_cmsghdr)))

262 return -EFAULT;

263 cmlen = CMSG_COMPAT_SPACE(len);

264 if (kmsg->msg_controllen < cmlen)

265 cmlen = kmsg->msg_controllen;

266 kmsg->msg_control += cmlen;

267 kmsg->msg_controllen -= cmlen;

268 return 0;

269 }

270

271 void scm_detach_fds_compat(struct msghdr *kmsg, struct scm_cookie *scm)

272 {

273 struct compat_cmsghdr __user *cm = (struct compat_cmsghdr __user *) kmsg->msg_control;

274 int fdmax = (kmsg->msg_controllen - sizeof(struct compat_cmsghdr)) / sizeof(int);

275 int fdnum = scm->fp->count;

276 struct file **fp = scm->fp->fp;

277 int __user *cmfptr;

278 int err = 0, i;

279

280 if (fdnum < fdmax)

281 fdmax = fdnum;

282

283 for (i = 0, cmfptr = (int __user *) CMSG_COMPAT_DATA(cm); i < fdmax; i++, cmfptr++) {

284 int new_fd;

285 err = security_file_receive(fp[i]);

286 if (err)

287 break;

288 err = get_unused_fd_flags(MSG_CMSG_CLOEXEC & kmsg->msg_flags

289 ? O_CLOEXEC : 0);

290 if (err < 0)

291 break;

292 new_fd = err;

293 err = put_user(new_fd, cmfptr);

294 if (err) {

295 put_unused_fd(new_fd);

296 break;

297 }

298 /* Bump the usage count and install the file. */

299 get_file(fp[i]);

300 fd_install(new_fd, fp[i]);

301 }

302

303 if (i > 0) {

304 int cmlen = CMSG_COMPAT_LEN(i * sizeof(int));

305 err = put_user(SOL_SOCKET, &cm->cmsg_level);

306 if (!err)

307 err = put_user(SCM_RIGHTS, &cm->cmsg_type);

308 if (!err)

309 err = put_user(cmlen, &cm->cmsg_len);

310 if (!err) {

311 cmlen = CMSG_COMPAT_SPACE(i * sizeof(int));

312 kmsg->msg_control += cmlen;

313 kmsg->msg_controllen -= cmlen;

314 }

315 }

316 if (i < fdnum)

317 kmsg->msg_flags |= MSG_CTRUNC;

318

319 /*

320 * All of the files that fit in the message have had their

321 * usage counts incremented, so we just free the list.

322 */

323 __scm_destroy(scm);

324 }

325

326 /*

327 * A struct sock_filter is architecture independent.

328 */

329 struct compat_sock_fprog {

330 u16 len;

331 compat_uptr_t filter; /* struct sock_filter * */

332 };

333

334 static int do_set_attach_filter(struct socket *sock, int level, int optname,

335 char __user *optval, unsigned int optlen)

336 {

337 struct compat_sock_fprog __user *fprog32 = (struct compat_sock_fprog __user *)optval;

338 struct sock_fprog __user *kfprog = compat_alloc_user_space(sizeof(struct sock_fprog));

339 compat_uptr_t ptr;

340 u16 len;

341

342 if (!access_ok(VERIFY_READ, fprog32, sizeof(*fprog32)) ||

343 !access_ok(VERIFY_WRITE, kfprog, sizeof(struct sock_fprog)) ||

344 __get_user(len, &fprog32->len) ||

345 __get_user(ptr, &fprog32->filter) ||

346 __put_user(len, &kfprog->len) ||

347 __put_user(compat_ptr(ptr), &kfprog->filter))

348 return -EFAULT;

349

350 return sock_setsockopt(sock, level, optname, (char __user *)kfprog,

351 sizeof(struct sock_fprog));

352 }

353

354 static int do_set_sock_timeout(struct socket *sock, int level,

355 int optname, char __user *optval, unsigned int optlen)

356 {

357 struct compat_timeval __user *up = (struct compat_timeval __user *)optval;

358 struct timeval ktime;

359 mm_segment_t old_fs;

360 int err;

361

362 if (optlen < sizeof(*up))

363 return -EINVAL;

364 if (!access_ok(VERIFY_READ, up, sizeof(*up)) ||

365 __get_user(ktime.tv_sec, &up->tv_sec) ||

366 __get_user(ktime.tv_usec, &up->tv_usec))

367 return -EFAULT;

368 old_fs = get_fs();

369 set_fs(KERNEL_DS);

370 err = sock_setsockopt(sock, level, optname, (char *)&ktime, sizeof(ktime));

371 set_fs(old_fs);

372

373 return err;

374 }

375

376 static int compat_sock_setsockopt(struct socket *sock, int level, int optname,

377 char __user *optval, unsigned int optlen)

378 {

379 if (optname == SO_ATTACH_FILTER)

380 return do_set_attach_filter(sock, level, optname,

381 optval, optlen);

382 if (optname == SO_RCVTIMEO || optname == SO_SNDTIMEO)

383 return do_set_sock_timeout(sock, level, optname, optval, optlen);

384

385 return sock_setsockopt(sock, level, optname, optval, optlen);

386 }

387

388 asmlinkage long compat_sys_setsockopt(int fd, int level, int optname,

389 char __user *optval, unsigned int optlen)

390 {

391 int err;

392 struct socket *sock = sockfd_lookup(fd, &err);

393

394 if (sock) {

395 err = security_socket_setsockopt(sock, level, optname);

396 if (err) {

397 sockfd_put(sock);

398 return err;

399 }

400

401 if (level == SOL_SOCKET)

402 err = compat_sock_setsockopt(sock, level,

403 optname, optval, optlen);

404 else if (sock->ops->compat_setsockopt)

405 err = sock->ops->compat_setsockopt(sock, level,

406 optname, optval, optlen);

407 else

408 err = sock->ops->setsockopt(sock, level,

409 optname, optval, optlen);

410 sockfd_put(sock);

411 }

412 return err;

413 }

414

415 static int do_get_sock_timeout(struct socket *sock, int level, int optname,

416 char __user *optval, int __user *optlen)

417 {

418 struct compat_timeval __user *up;

419 struct timeval ktime;

420 mm_segment_t old_fs;

421 int len, err;

422

423 up = (struct compat_timeval __user *) optval;

424 if (get_user(len, optlen))

425 return -EFAULT;

426 if (len < sizeof(*up))

427 return -EINVAL;

428 len = sizeof(ktime);

429 old_fs = get_fs();

430 set_fs(KERNEL_DS);

431 err = sock_getsockopt(sock, level, optname, (char *) &ktime, &len);

432 set_fs(old_fs);

433

434 if (!err) {

435 if (put_user(sizeof(*up), optlen) ||

436 !access_ok(VERIFY_WRITE, up, sizeof(*up)) ||

437 __put_user(ktime.tv_sec, &up->tv_sec) ||

438 __put_user(ktime.tv_usec, &up->tv_usec))

439 err = -EFAULT;

440 }

441 return err;

442 }

443

444 static int compat_sock_getsockopt(struct socket *sock, int level, int optname,

445 char __user *optval, int __user *optlen)

446 {

447 if (optname == SO_RCVTIMEO || optname == SO_SNDTIMEO)

448 return do_get_sock_timeout(sock, level, optname, optval, optlen);

449 return sock_getsockopt(sock, level, optname, optval, optlen);

450 }

451

452 int compat_sock_get_timestamp(struct sock *sk, struct timeval __user *userstamp)

453 {

454 struct compat_timeval __user *ctv =

455 (struct compat_timeval __user *) userstamp;

456 int err = -ENOENT;

457 struct timeval tv;

458

459 if (!sock_flag(sk, SOCK_TIMESTAMP))

460 sock_enable_timestamp(sk, SOCK_TIMESTAMP);

461 tv = ktime_to_timeval(sk->sk_stamp);

462 if (tv.tv_sec == -1)

463 return err;

464 if (tv.tv_sec == 0) {

465 sk->sk_stamp = ktime_get_real();

466 tv = ktime_to_timeval(sk->sk_stamp);

467 }

468 err = 0;

469 if (put_user(tv.tv_sec, &ctv->tv_sec) ||

470 put_user(tv.tv_usec, &ctv->tv_usec))

471 err = -EFAULT;

472 return err;

473 }

474 EXPORT_SYMBOL(compat_sock_get_timestamp);

475

476 int compat_sock_get_timestampns(struct sock *sk, struct timespec __user *userstamp)

477 {

478 struct compat_timespec __user *ctv =

479 (struct compat_timespec __user *) userstamp;

480 int err = -ENOENT;

481 struct timespec ts;

482

483 if (!sock_flag(sk, SOCK_TIMESTAMP))

484 sock_enable_timestamp(sk, SOCK_TIMESTAMP);

485 ts = ktime_to_timespec(sk->sk_stamp);

486 if (ts.tv_sec == -1)

487 return err;

488 if (ts.tv_sec == 0) {

489 sk->sk_stamp = ktime_get_real();

490 ts = ktime_to_timespec(sk->sk_stamp);

491 }

492 err = 0;

493 if (put_user(ts.tv_sec, &ctv->tv_sec) ||

494 put_user(ts.tv_nsec, &ctv->tv_nsec))

495 err = -EFAULT;

496 return err;

497 }

498 EXPORT_SYMBOL(compat_sock_get_timestampns);

499

500 asmlinkage long compat_sys_getsockopt(int fd, int level, int optname,

501 char __user *optval, int __user *optlen)

502 {

503 int err;

504 struct socket *sock = sockfd_lookup(fd, &err);

505

506 if (sock) {

507 err = security_socket_getsockopt(sock, level, optname);

508 if (err) {

509 sockfd_put(sock);

510 return err;

511 }

512

513 if (level == SOL_SOCKET)

514 err = compat_sock_getsockopt(sock, level,

515 optname, optval, optlen);

516 else if (sock->ops->compat_getsockopt)

517 err = sock->ops->compat_getsockopt(sock, level,

518 optname, optval, optlen);

519 else

520 err = sock->ops->getsockopt(sock, level,

521 optname, optval, optlen);

522 sockfd_put(sock);

523 }

524 return err;

525 }

526

527 struct compat_group_req {

528 __u32 gr_interface;

529 struct __kernel_sockaddr_storage gr_group

530 __attribute__ ((aligned(4)));

531 } __packed;

532

533 struct compat_group_source_req {

534 __u32 gsr_interface;

535 struct __kernel_sockaddr_storage gsr_group

536 __attribute__ ((aligned(4)));

537 struct __kernel_sockaddr_storage gsr_source

538 __attribute__ ((aligned(4)));

539 } __packed;

540

541 struct compat_group_filter {

542 __u32 gf_interface;

543 struct __kernel_sockaddr_storage gf_group

544 __attribute__ ((aligned(4)));

545 __u32 gf_fmode;

546 __u32 gf_numsrc;

547 struct __kernel_sockaddr_storage gf_slist[1]

548 __attribute__ ((aligned(4)));

549 } __packed;

550

551 #define __COMPAT_GF0_SIZE (sizeof(struct compat_group_filter) - \

552 sizeof(struct __kernel_sockaddr_storage))

553

554

555 int compat_mc_setsockopt(struct sock *sock, int level, int optname,

556 char __user *optval, unsigned int optlen,

557 int (*setsockopt)(struct sock *, int, int, char __user *, unsigned int))

558 {

559 char __user *koptval = optval;

560 int koptlen = optlen;

561

562 switch (optname) {

563 case MCAST_JOIN_GROUP:

564 case MCAST_LEAVE_GROUP:

565 {

566 struct compat_group_req __user *gr32 = (void *)optval;

567 struct group_req __user *kgr =

568 compat_alloc_user_space(sizeof(struct group_req));

569 u32 interface;

570

571 if (!access_ok(VERIFY_READ, gr32, sizeof(*gr32)) ||

572 !access_ok(VERIFY_WRITE, kgr, sizeof(struct group_req)) ||

573 __get_user(interface, &gr32->gr_interface) ||

574 __put_user(interface, &kgr->gr_interface) ||

575 copy_in_user(&kgr->gr_group, &gr32->gr_group,

576 sizeof(kgr->gr_group)))

577 return -EFAULT;

578 koptval = (char __user *)kgr;

579 koptlen = sizeof(struct group_req);

580 break;

581 }

582 case MCAST_JOIN_SOURCE_GROUP:

583 case MCAST_LEAVE_SOURCE_GROUP:

584 case MCAST_BLOCK_SOURCE:

585 case MCAST_UNBLOCK_SOURCE:

586 {

587 struct compat_group_source_req __user *gsr32 = (void *)optval;

588 struct group_source_req __user *kgsr = compat_alloc_user_space(

589 sizeof(struct group_source_req));

590 u32 interface;

591

592 if (!access_ok(VERIFY_READ, gsr32, sizeof(*gsr32)) ||

593 !access_ok(VERIFY_WRITE, kgsr,

594 sizeof(struct group_source_req)) ||

595 __get_user(interface, &gsr32->gsr_interface) ||

596 __put_user(interface, &kgsr->gsr_interface) ||

597 copy_in_user(&kgsr->gsr_group, &gsr32->gsr_group,

598 sizeof(kgsr->gsr_group)) ||

599 copy_in_user(&kgsr->gsr_source, &gsr32->gsr_source,

600 sizeof(kgsr->gsr_source)))

601 return -EFAULT;

602 koptval = (char __user *)kgsr;

603 koptlen = sizeof(struct group_source_req);

604 break;

605 }

606 case MCAST_MSFILTER:

607 {

608 struct compat_group_filter __user *gf32 = (void *)optval;

609 struct group_filter __user *kgf;

610 u32 interface, fmode, numsrc;

611

612 if (!access_ok(VERIFY_READ, gf32, __COMPAT_GF0_SIZE) ||

613 __get_user(interface, &gf32->gf_interface) ||

614 __get_user(fmode, &gf32->gf_fmode) ||

615 __get_user(numsrc, &gf32->gf_numsrc))

616 return -EFAULT;

617 koptlen = optlen + sizeof(struct group_filter) -

618 sizeof(struct compat_group_filter);

619 if (koptlen < GROUP_FILTER_SIZE(numsrc))

620 return -EINVAL;

621 kgf = compat_alloc_user_space(koptlen);

622 if (!access_ok(VERIFY_WRITE, kgf, koptlen) ||

623 __put_user(interface, &kgf->gf_interface) ||

624 __put_user(fmode, &kgf->gf_fmode) ||

625 __put_user(numsrc, &kgf->gf_numsrc) ||

626 copy_in_user(&kgf->gf_group, &gf32->gf_group,

627 sizeof(kgf->gf_group)) ||

628 (numsrc && copy_in_user(kgf->gf_slist, gf32->gf_slist,

629 numsrc * sizeof(kgf->gf_slist[0]))))

630 return -EFAULT;

631 koptval = (char __user *)kgf;

632 break;

633 }

634

635 default:

636 break;

637 }

638 return setsockopt(sock, level, optname, koptval, koptlen);

639 }

640 EXPORT_SYMBOL(compat_mc_setsockopt);

641

642 int compat_mc_getsockopt(struct sock *sock, int level, int optname,

643 char __user *optval, int __user *optlen,

644 int (*getsockopt)(struct sock *, int, int, char __user *, int __user *))

645 {

646 struct compat_group_filter __user *gf32 = (void *)optval;

647 struct group_filter __user *kgf;

648 int __user *koptlen;

649 u32 interface, fmode, numsrc;

650 int klen, ulen, err;

651

652 if (optname != MCAST_MSFILTER)

653 return getsockopt(sock, level, optname, optval, optlen);

654

655 koptlen = compat_alloc_user_space(sizeof(*koptlen));

656 if (!access_ok(VERIFY_READ, optlen, sizeof(*optlen)) ||

657 __get_user(ulen, optlen))

658 return -EFAULT;

659

660 /* adjust len for pad */

661 klen = ulen + sizeof(*kgf) - sizeof(*gf32);

662

663 if (klen < GROUP_FILTER_SIZE(0))

664 return -EINVAL;

665

666 if (!access_ok(VERIFY_WRITE, koptlen, sizeof(*koptlen)) ||

667 __put_user(klen, koptlen))

668 return -EFAULT;

669

670 /* have to allow space for previous compat_alloc_user_space, too */

671 kgf = compat_alloc_user_space(klen+sizeof(*optlen));

672

673 if (!access_ok(VERIFY_READ, gf32, __COMPAT_GF0_SIZE) ||

674 __get_user(interface, &gf32->gf_interface) ||

675 __get_user(fmode, &gf32->gf_fmode) ||

676 __get_user(numsrc, &gf32->gf_numsrc) ||

677 __put_user(interface, &kgf->gf_interface) ||

678 __put_user(fmode, &kgf->gf_fmode) ||

679 __put_user(numsrc, &kgf->gf_numsrc) ||

680 copy_in_user(&kgf->gf_group, &gf32->gf_group, sizeof(kgf->gf_group)))

681 return -EFAULT;

682

683 err = getsockopt(sock, level, optname, (char __user *)kgf, koptlen);

684 if (err)

685 return err;

686

687 if (!access_ok(VERIFY_READ, koptlen, sizeof(*koptlen)) ||

688 __get_user(klen, koptlen))

689 return -EFAULT;

690

691 ulen = klen - (sizeof(*kgf)-sizeof(*gf32));

692

693 if (!access_ok(VERIFY_WRITE, optlen, sizeof(*optlen)) ||

694 __put_user(ulen, optlen))

695 return -EFAULT;

696

697 if (!access_ok(VERIFY_READ, kgf, klen) ||

698 !access_ok(VERIFY_WRITE, gf32, ulen) ||

699 __get_user(interface, &kgf->gf_interface) ||

700 __get_user(fmode, &kgf->gf_fmode) ||

701 __get_user(numsrc, &kgf->gf_numsrc) ||

702 __put_user(interface, &gf32->gf_interface) ||

703 __put_user(fmode, &gf32->gf_fmode) ||

704 __put_user(numsrc, &gf32->gf_numsrc))

705 return -EFAULT;

706 if (numsrc) {

707 int copylen;

708

709 klen -= GROUP_FILTER_SIZE(0);

710 copylen = numsrc * sizeof(gf32->gf_slist[0]);

711 if (copylen > klen)

712 copylen = klen;

713 if (copy_in_user(gf32->gf_slist, kgf->gf_slist, copylen))

714 return -EFAULT;

715 }

716 return err;

717 }

718 EXPORT_SYMBOL(compat_mc_getsockopt);

719

720

721 /* Argument list sizes for compat_sys_socketcall */

722 #define AL(x) ((x) * sizeof(u32))

723 static unsigned char nas[20] = {

724 AL(0), AL(3), AL(3), AL(3), AL(2), AL(3),

725 AL(3), AL(3), AL(4), AL(4), AL(4), AL(6),

726 AL(6), AL(2), AL(5), AL(5), AL(3), AL(3),

727 AL(4), AL(5)

728 };

729 #undef AL

730

731 asmlinkage long compat_sys_sendmsg(int fd, struct compat_msghdr __user *msg, unsigned flags)

732 {

733 return sys_sendmsg(fd, (struct msghdr __user *)msg, flags | MSG_CMSG_COMPAT);

734 }

735

736 asmlinkage long compat_sys_recvmsg(int fd, struct compat_msghdr __user *msg, unsigned int flags)

737 {

738 return sys_recvmsg(fd, (struct msghdr __user *)msg, flags | MSG_CMSG_COMPAT);

739 }

740

741 asmlinkage long compat_sys_recv(int fd, void __user *buf, size_t len, unsigned flags)

742 {

743 return sys_recv(fd, buf, len, flags | MSG_CMSG_COMPAT);

744 }

745

746 asmlinkage long compat_sys_recvfrom(int fd, void __user *buf, size_t len,

747 unsigned flags, struct sockaddr __user *addr,

748 int __user *addrlen)

749 {

750 return sys_recvfrom(fd, buf, len, flags | MSG_CMSG_COMPAT, addr, addrlen);

751 }

752

753 asmlinkage long compat_sys_recvmmsg(int fd, struct compat_mmsghdr __user *mmsg,

754 unsigned vlen, unsigned int flags,

755 struct compat_timespec __user *timeout)

756 {

757 int datagrams;

758 struct timespec ktspec;

759

760 if (timeout == NULL)

761 return __sys_recvmmsg(fd, (struct mmsghdr __user *)mmsg, vlen,

762 flags | MSG_CMSG_COMPAT, NULL);

763

764 if (get_compat_timespec(&ktspec, timeout))

765 return -EFAULT;

766

767 datagrams = __sys_recvmmsg(fd, (struct mmsghdr __user *)mmsg, vlen,

768 flags | MSG_CMSG_COMPAT, &ktspec);

769 if (datagrams > 0 && put_compat_timespec(&ktspec, timeout))

770 datagrams = -EFAULT;

771

772 return datagrams;

773 }

774

775 asmlinkage long compat_sys_socketcall(int call, u32 __user *args)

776 {

777 int ret;

778 u32 a[6];

779 u32 a0, a1;

780

781 if (call < SYS_SOCKET || call > SYS_RECVMMSG)

782 return -EINVAL;

783 if (copy_from_user(a, args, nas[call]))

784 return -EFAULT;

785 a0 = a[0];

786 a1 = a[1];

787

788 switch (call) {

789 case SYS_SOCKET:

790 ret = sys_socket(a0, a1, a[2]);

791 break;

792 case SYS_BIND:

793 ret = sys_bind(a0, compat_ptr(a1), a[2]);

794 break;

795 case SYS_CONNECT:

796 ret = sys_connect(a0, compat_ptr(a1), a[2]);

797 break;

798 case SYS_LISTEN:

799 ret = sys_listen(a0, a1);

800 break;

801 case SYS_ACCEPT:

802 ret = sys_accept4(a0, compat_ptr(a1), compat_ptr(a[2]), 0);

803 break;

804 case SYS_GETSOCKNAME:

805 ret = sys_getsockname(a0, compat_ptr(a1), compat_ptr(a[2]));

806 break;

807 case SYS_GETPEERNAME:

808 ret = sys_getpeername(a0, compat_ptr(a1), compat_ptr(a[2]));

809 break;

810 case SYS_SOCKETPAIR:

811 ret = sys_socketpair(a0, a1, a[2], compat_ptr(a[3]));

812 break;

813 case SYS_SEND:

814 ret = sys_send(a0, compat_ptr(a1), a[2], a[3]);

815 break;

816 case SYS_SENDTO:

817 ret = sys_sendto(a0, compat_ptr(a1), a[2], a[3], compat_ptr(a[4]), a[5]);

818 break;

819 case SYS_RECV:

820 ret = compat_sys_recv(a0, compat_ptr(a1), a[2], a[3]);

821 break;

822 case SYS_RECVFROM:

823 ret = compat_sys_recvfrom(a0, compat_ptr(a1), a[2], a[3],

824 compat_ptr(a[4]), compat_ptr(a[5]));

825 break;

826 case SYS_SHUTDOWN:

827 ret = sys_shutdown(a0, a1);

828 break;

829 case SYS_SETSOCKOPT:

830 ret = compat_sys_setsockopt(a0, a1, a[2],

831 compat_ptr(a[3]), a[4]);

832 break;

833 case SYS_GETSOCKOPT:

834 ret = compat_sys_getsockopt(a0, a1, a[2],

835 compat_ptr(a[3]), compat_ptr(a[4]));

836 break;

837 case SYS_SENDMSG:

838 ret = compat_sys_sendmsg(a0, compat_ptr(a1), a[2]);

839 break;

840 case SYS_RECVMSG:

841 ret = compat_sys_recvmsg(a0, compat_ptr(a1), a[2]);

842 break;

843 case SYS_RECVMMSG:

844 ret = compat_sys_recvmmsg(a0, compat_ptr(a1), a[2], a[3],

845 compat_ptr(a[4]));

846 break;

847 case SYS_ACCEPT4:

848 ret = sys_accept4(a0, compat_ptr(a1), compat_ptr(a[2]), a[3]);

849 break;

850 default:

851 ret = -EINVAL;

852 break;

853 }

854 return ret;

855 }